Which of these statements is FALSE?*
If you find someone's DNA at a crime scene, they are guilty without a doubt
Even identical Twins have different DNA Fingerprints
DNA is individual evidence
When DNA is found, it will not always lead to usable DNA Fingerprint evidence
Answers
hope this helped
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9. (5 pts) A person carries a 25.0-N rock through the path shown in the figure, starting at point A and ending at point B. The total time from A to B is 1.50 min. How much work did gravity do on the rock between A and B? 8.0 m 6.0 m B 1.5 m
Answers
The magnitude of the work done by force of gravity is 162.5 J.
What is the work done by gravity between A and B?The work done by gravity between A and B is calculated by applying the principle of conservation of energy as shown below.
Mathematically, the relationship between work done and change in potential energy is given as;
W = ΔP.E
where;
W is the work doneΔP.E is the change in potential energyW = mgΔh
W = mg ( hf - hi )
where;
m is the mass of the rock carriedg is acceleration due to gravityhf is the final height attained by the rockhi is the initial height attained by the rockLet the initial height of the rock at A = 8.0 m
let the final height of the rock at B = 1.5 m
The work done by force of gravity is calculated as;
W = mg ( hf - hi )
W = 25 N (1.5 m - 8.0 m )
W = 25 N ( - 6.5 m)
W = -162.5 J
Thus, the magnitude of the work done by force of gravity is a function of weight of the rock and change in height of the rock.
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For 2.5 seconds, an earthworm crawled directly toward a rock at a constant velocity. It crawled 35 millimeters in that time. What was the earthworm's velocity? Please answer in whole numbers.
Answers
The velocity of the earthworm when it crawled 35 millimeter over a time of 2.5 seconds is 0.014 m/s.
What is velocity?
Velocity can be defined as the ratio of displacement to time of a body.
To calculate the earthworm's velocity, we use the formula below.
Formula:
v = d/t........... Equation 1Where:
v = Velocity of the earthwarm's velocityd = Distance crawled 35 milimeters by the earthwormt = time.From the question,
Given:
d = 35 mm = 0.035 mt = 2.5 secondsSubstitute these values into equation 1
v = 0.035/2.5v = 0.014 m/s.Hence, the earthworm's velocity is 0.014 m/s.
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Unsaturated means that each C atom is bonded to four other atoms (H or C)-the most possible; there are no double or triple bonds in the molecules.
(a) True
(b) False
Answers
The statement "Unsaturated means that each C atom is bonded to four other atoms (H or C)-the most possible; there are no double or triple bonds in the molecules" is False.
What is meant by an unsaturated compound?An unsaturated compound is a chemical compound in which at least one double or triple bond exists between carbon atoms. These bonds may be between two carbon atoms or between a carbon atom and another element, such as oxygen or nitrogen, and they create a region of unsaturation in the molecule. In chemistry, the term unsaturation is used to describe the number of multiple bonds present in a molecule. The more unsaturated a molecule is, the more double and triple bonds it contains. Molecules with no multiple bonds are referred to as saturated because each carbon atom is linked to four other atoms (usually hydrogen).
This means that Unsaturated doesn't mean that each C atom is bonded to four other atoms (H or C)-the most possible, and there are no double or triple bonds in the molecules. Therefore, the correct option is (b) False.
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Question 1 of 14 Which of the following statements describes a perfectly inelastic collision? O A. An ice hockey player picks up a trophy as he slides past it. O B. A baseball bat hits a baseball into the outfield. O C. A surfer falls off of his surfboard when a wave hits him. D. Two birds collide in midair and fly off in different directions.
Answers
Answer: A. An ice hockey player picks up a trophy as he slides past it
Explanation:
A PE X
The statement that best describes a perfectly inelastic collision is
C. A surfer falls off of his surfboard when a wave hits him.
What is collision?A collision is the interaction between two bodies in such a way that the momentum and velocity of one body gets changed due to the presence of other body. There are three types of collision-
1. Elastic collision
2. Inelastic collision
3. Perfectly inelastic collision.
In all types of collision , the momentum of the system before collision and after collision always remains same or we can say that momentum is conserved in collisions
What is elastic collisionAn elastic collision is the one in which kinetic energy is also conserved and coefficient of restitution is one. Both the bodies move separately with different velocities after elastic collision.
What is inelastic collision ?In inelastic collision there is a loss of kinetic energy and coefficient of restitution is less than one.
What is perfectly inelastic collision?In perfectly inelastic collision there is maximum loss of kinetic energy and coefficient of restitution is zero. Both the bodies stick together after collision and move with same velocity
What is coefficient of restitution ?Coefficient of restitution is the ratio of relative velocity of separation after collision to relative velocity of approach before collision.
A surfer falls of his surfboard when a wave hits him is an example of perfectly inelastic collision because in this when water hits the surfers he falls of and sticks to the water , and will also now move with the velocity of water .
So when the surfer falls off his surfboard when a wave hits him is perfectly inelastic collision.
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Which hand on a wall-clock has the longest period, the hour-hand, the minute-hand or the second-hand? Justify your answer
Answers
The hour hand (the shortest) has the longest period. This is because the thin long hand that goes around quickly is seconds, seconds lead into minutes (60 seconds is 1 minute). The minute hand is the second longest period (60 minutes is an hour). This leaves the hour hand, which takes the longest.
Hope this helps :)
the minute hand (the longer one) takes a minute to go around
Since the hour hand takes longer to go around, it has the longest period :)
A fluid of viscosity 0.15 Pa.s and density 1100 kg/m³ is transported vertically in a feed pipe of internal diameter (ID = 0.15 m). A spherical thermal sensor, 0.001 m in diameter was installed into the pipe. The velocity at the tip of the sensor inside the pipe is required for calibration of the sensor. It is not possible to accurately measure the velocity of the fluid at the location of the tip of the sensor, and unfortunately due to poor workmanship, the sensor was not installed perpendicularly to the pipe wall and the sensor tip is not positioned at the centre of the pipe. Workmen have conducted the following measurements shown below when the pipe was empty.
Answers
In order to calibrate the thermal sensor installed in the vertical feed pipe, the velocity at the tip of the sensor needs to be determined. However, accurate measurement of the fluid velocity at that location is not possible, and the sensor was also not installed perpendicular to the pipe wall, with its tip not positioned at the center of the pipe. The workmen conducted measurements when the pipe was empty, and these measurements will be used to estimate the velocity at the sensor's tip.
To estimate the velocity at the tip of the thermal sensor, we can make use of the principle of continuity, which states that the mass flow rate of an incompressible fluid remains constant along a streamline. Since the pipe is empty, the mass flow rate is zero. However, we can assume that the continuity equation still holds, and by considering the cross-sectional areas of the pipe and the sensor, we can estimate the velocity at the tip.
First, we need to determine the cross-sectional area of the sensor. Since it is a sphere, the cross-sectional area is given by A = πr^2, where r is the radius of the sensor (0.001 m/2 = 0.0005 m).
Next, we can use the principle of continuity to relate the velocity at the pipe's cross-section (empty) to the velocity at the sensor's cross-section. According to the principle of continuity, A_pipe * V_pipe = A_sensor * V_sensor.
Since the pipe is empty, the velocity at the pipe's cross-section is zero. Plugging in the values, we have 0 * V_pipe = π(0.0005^2) * V_sensor.
Simplifying the equation, we can solve for V_sensor, which will give us the estimated velocity at the tip of the sensor inside the pipe.
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A car increases its speed from 30 km/h to 60 km/h in 5 seconds. Its acceleration s (a) 1.66 m/s² (b) 5 km/h² (c) 16.6 km/h² (d) 5m/s²
Answers
Answer: 6 km/h²
Explanation:
Final Speed= 60 km/h
Initial Speed= 30 km/h
Time= 5 sec
Now,
60= 30 + Acceleration*5
⇒Acceleration = 6 km/h²
tipler gogole books a 10kg block rests on a 5kg bracket on a frictionless surface. the coefficient of friction between teh 10kg block and teh bracket on which it rests are ux and uk
Answers
The frictional force between the 10kg block and the bracket is determined by the coefficient of friction (ux or uk) and the weight of the block.
When a block rests on a surface, the weight of the block acts vertically downward. The frictional force opposes the motion or tendency of motion between the block and the surface. In this case, the frictional force acts between the 10kg block and the bracket on which it rests. The frictional force can be calculated using the equation F_friction = μ * N, where μ is the coefficient of friction and N is the normal force.
The normal force on the block is equal to the weight of the block, which is given by N = mg, where m is the mass of the block and g is the acceleration due to gravity. In this case, the mass of the block is 10kg. So, N = (10kg) * (9.8 m/s^2) = 98N.
Therefore, the frictional force can be calculated as F_friction = μ * N = μ * 98N.
In the first step, we determine that the frictional force between the 10kg block and the bracket is given by μ * 98N.
When we have a resting block on a surface, the frictional force comes into play to prevent the block from sliding or moving. The coefficient of friction (μ) determines the magnitude of the frictional force. If the coefficient of friction (μ) is larger, it means there is a stronger frictional force between the block and the bracket, making it more difficult for the block to slide. Conversely, if the coefficient of friction (μ) is smaller, the frictional force is weaker, and the block is more likely to slide.
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in a two coil system the mutual inductance depends on
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The mutual inductance (M) in a two-coil system depends on the number of turns in each coil (N₁ and N₂), the permeability of the medium between the coils (µ), and the geometry of the coils.
Mutual inductance is a measure of the ability of one coil to induce an electromotive force (emf) in the other coil when a current changes in one of them. It depends on several factors.
First, the number of turns in each coil plays a role. The greater the number of turns, the stronger the magnetic field produced by the coil, resulting in a higher mutual inductance.
Second, the permeability of the medium between the coils is important. The permeability determines how easily magnetic flux lines pass through the medium. A higher permeability leads to stronger coupling between the coils and, consequently, higher mutual inductance.
Lastly, the physical arrangement and geometry of the coils affect the mutual inductance. The proximity and alignment of the coils influence the amount of magnetic flux linking them, thereby impacting the mutual inductance.
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an asteroid is 180,000km away from the moon on a collision course. how much time will it take before the asteroid is 10km away if it is moving at a constant velocity of 36,000m/s?
Answers
Answer:
See below
Explanation:
(180 000 - 10) km / 36 km/s = 4999.7 =~ 5000 seconds = 83 .3 min
A tire has a counterclockwise angular acceleration of 16 rad over s^2 and reaches a counterclockwise
angular velocity of 95 over 0.25 s.
S
What was the initial angular velocity of the tire?
Answers
The initial angular velocity of the tire in counterclockwise direction was 91 radian/second.
What is angular velocity?The vector representation of rotation rate, or how quickly an item rotates or revolves in relative to another point, is called angular velocity.
Given that angular acceleration of the tire in counterclockwise direction = 16 rad/sec^2.
Final angular velocity in counterclockwise direction = 95 rad/second.
time taken = 0.25 second.
Hence, initial angular velocity in counterclockwise direction = final angular velocity - angular acceleration× time
= (95 - 16×0.25) radian/second
= 91 radian/second.
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suppose you have a line graph with kilometers on the y-axis and minutes on the x-axis. if your line indicates that in 2.0 min you travel 0.4 km and in 5.0 min you travel 1.0 km. what is the slope of the line
Answers
a graph is a visual representation or diagram that shows facts or values in an ordered way. The relationships between two or more items are frequently represented by the points on a graph.
What is Graph?
Here, for instance, we can plot a graph showing the type and quantity of school supplies used by pupils in a class based on the data provided below.
Each supply is first counted, and the data is then shown in a table with specific colors in a logical order.
The term "pictograph" refers to the visual depiction of information. Each graphic represents a specified number of objects. To show how many cricket bats a store sold during a certain week, for instance, you could include a picture of a cricket bat.
Therefore, a graph is a visual representation or diagram that shows facts or values in an ordered way. The relationships between two or more items are frequently represented by the points on a graph.
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A blue train of mass 50 kg moves at 4 m/s toward a green train of 30 kg initially at rest. The trains collide. After the collision the green train moves with a speed of 3 m/s. What is the final momentum of the green train? A. 90 kgm/s B. 20 kgm/s C. 200 kgm/s D. 110 kgm/s
Answers
Explanation:
Momentum = mass × speed
p = (30 kg) (3 m/s)
p = 90 kg m/s
How is MA(Mechanical Advantage) gain while lifting a load by using single movable pulley?
Answers
In a system using a single movable pulley, the mechanical advantage (MA) is equal to 2. This means that the load being lifted will experience a gain in force of two times the input force applied.
A movable pulley is one that is attached to the load being lifted and is free to move along with it.
When a force is applied to lift the load, the movable pulley changes its position, effectively reducing the force required to lift the load.
The key concept behind the mechanical advantage is that the load is distributed between the input force and the pulley.
In a single movable pulley system, the load is divided between the input force and the pulley itself.
The input force only needs to overcome half of the load's weight since the pulley contributes an equal amount of force in the opposite direction. This results in an MA of 2, indicating a doubling of force.
For example, if a load weighs 100 pounds, an input force of 50 pounds would be sufficient to lift it.
The movable pulley helps distribute the load's weight, reducing the force required by half.
Overall, using a single movable pulley provides a mechanical advantage of 2, allowing the load to be lifted with less force compared to lifting it directly.
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how big is the black hole at the center of the milky way
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At the center of our galaxy lies the supermassive black hole Sagittarius A*, often abbreviated Sgr A*. This giant is about 4 million times the mass of the sun and about 14.6 million miles (23.6 million kilometers) in diameter.
In physics, the Milky Way refers to the galaxy in which our solar system resides. The Milky Way is a barred spiral galaxy, meaning it has a central bar-shaped structure with arms spiraling out from it. The galaxy is estimated to be around 13.6 billion years old and contains billions of stars, as well as gas, dust, and dark matter.
The Milky Way has a diameter of approximately 100,000 light-years and is located about 26,000 light-years from the galactic center. It rotates once every 240 million years, with stars closer to the center moving faster than those on the outer edges. The gravitational force of the Milky Way holds the solar system in its orbit.
The study of the Milky Way is important in astrophysics as it provides insight into the evolution and formation of galaxies.
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If you put 2 eggs in water for 5 secs will it explode???
Answers
Answer:
No not at all
Explanation:
Answer:
Hard-boiled eggs don't react well (or, depending on the perspective, react extremely well) to microwaves. Heat one up in a microwave and — assuming it doesn't burst
so yeah it does not explode
A boy of mass 40kg and a girl of mass 30kg play on a see-saw of negligible weight. If the boy sits 270 cm from the pivot of the see-saw, where must the girl sit to make it balance.
Please show the steps....I will follow you if you do.
Answers
Hi there!
To solve, we can use a summation of torques.
For the see-saw to balance, the sum of torques must equal 0, so:
∑τ = 0
Recall that:
τ = rFsinθ
r = distance from pivot (meters)
F = force (N)
In this case, the forces are the weight of the children. Also, we can leave the distance in centimeters for this type of problem, but others do require a conversion to meters.
Multiply each mass by 10 (g ≈ 10 m/s²) to get the weight:
Στ = 270(400) - x(300) = 0
270(400) = 300x
Solve for 'x', the distance in cm away from the fulcrum:
108000/300 = 360 cm
An optician uses a plane mirror to help him. Suppose a patient sits in a chair 2.5 m away from him. He views the image of a chart which faces the mirror and is located 30 cm behind him. How far away is the chart as viewed from his eyes.
Answers
An optician uses a plane mirror to help him. A patient sits in a chair 2.5 m away from him and he views the image of a chart that faces the mirror and is located 30 cm behind him. The distance away from the chart viewed from his eyes is 5.3 m.
According to the given problem, the gap between the mirror and the photo of the chart is identical to the distance between the chart and the reflection.
So, if the patient sits 2.5 m far from the replicate and the chart is 30 cm behind the optician, then the distance between the chart and the reflect is 2.5 m + 0.3 m = 2.8 m. Therefore, the distance between the replicate and the image of the chart is also 2.8 m.
Now, to discover the space between the affected person’s eyes and the photograph of the chart, we need to feature the distance between the affected person’s eyes and the replicate, which is 2.5 m.
So, the final solution is 2.5 m + 2.8 m = 5.3 m.
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If a scale shows that an individual has a mass of 68 kg, what is that individual's weight? (Show work and explain)
a. 68 kg
b. -667 N
c. either a or b
d. neither a nor b
Answers
The individual's weight is approximately 666.4 N. the individual's weight is 68 kg.
To determine the individual's weight, we need to use the formula:
Weight = mass × gravitational acceleration
The gravitational acceleration on Earth is approximately 9.8 m/s².
(a) Using the given mass of 68 kg:
Weight = 68 kg × 9.8 m/s² = 666.4 N
So, the individual's weight is approximately 666.4 N.
(b) -667 N is not a valid weight value in this case because weight is a scalar quantity and is always positive. Therefore, option (b) is incorrect.
(c) The correct answer is (a) 68 kg since weight is a measure of the force exerted on an object due to gravity, and it is equivalent to the product of mass and gravitational acceleration.
Therefore, the individual's weight is 68 kg.
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A pitcher is pitched with a speed of 35 m/s if the baseball has a mass of 0. 146 kg what is its kinetic energy
Answers
According to the information we can infer that the kinetic energy of the baseball is approximately 85.68 joules.
What is the kinetic energy of the baseball?The formula to calculate kinetic energy is
KE = 0.5 * mass * velocity².Given:
Mass of the baseball (m) = 0.146 kgVelocity of the baseball (v) = 35 m/sPlugging these values into the formula, we have:
KE = 0.5 * 0.146 kg * (35 m/s)²Simplifying the equation:
KE = 0.5 * 0.146 kg * 1225 m²/s²KE ≈ 85.68 joulesAccording to the above, the kinetic energy of the baseball is approximately 85.68 joules.
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Jenna took an open bowl of leftover mashed potatoes from the refrigerator and noticed a difference in smell. She determined that chemical changes occurred since the potatoes were first placed there.
Which observations most likely led to Jenna’s conclusion?
a change of odor
a decrease in temperature
a change in moisture content
a decrease in mass
Answers
Answer:
A change of odor
Hope this helps! :)
calculate the centripetal force on the end of a 66.0 m (radius) wind turbine blade that is rotating at 0.47 rev/s. assume the mass is 3.4 kg.
Answers
Centripetal force on the end of a 66.0 m (radius) wind turbine blade that is rotating is calculated as = 1.23 *10^-4 N.
What is Centripetal force?Centripetal force is the force acting on the object in curvilinear motion directed towards axis of rotation or the center of curvature and the unit of centripetal force is newton. It is directed perpendicular to the direction of the displacement of the object.
Given, radius= 66m mass is 3.4 kg
Given 0.47 rev/s
Angular velocity = 0.47 * 2π / 60
= 0.049 m/s
Centripetal force = mass * velocity²/radius
= 3.4 * 0.049² /66
Centripetal force= 1.23 *10^-4 N
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A body is found at 9:30pm. The temperature of the liver registers 84.6F what is the approximate TOD of the victim
Answers
The approximate TOD of the victim is Maybe around 4:30 pm.
How can you gauge the temperature of your liver?The liver temperature can provide a more accurate representation of the genuine core body temperature, hence it is ideal to take the temperature either rectally or by monitoring the liver temperature.To do this, a tiny incision must be made in the right upper belly, and the thermometer must be inserted into the liver tissue.
How is the death date determined?This stiffening process, known as rigor mortis, occurs at a fairly known time, making it possible to predict when someone will pass away.In overall: If the body is warm and there is no rigidity, the time of death was less than three hours ago.If the body is stiff and warm, death happened 3 to 8 hours earlier.
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to what potential should you charge a 0.600 μf capacitor to store 1.60 j of energy
Answers
To store 1.60 j of energy, the capacitor of 0.600 μf must be charged to a potential of 2.31 kV.
To find the potential needed to charge a 0.600 μF capacitor to store 1.60 J of energy, we can use the formula for the energy stored in a capacitor:
Energy (E) = (1/2) × Capacitance (C) × Voltage^2 (V²)
We are given the energy (E = 1.60 J) and the capacitance (C = 0.600 μF), and we need to find the voltage (V).
1. Rearrange the formula to solve for V:
V² = (2 × E) / C
2. Plug in the given values:
V² = (2 × 1.60 J) / (0.600 μF)
3. Calculate the result:
V² = 5.333... (rounded to the nearest thousandth)
4. Take the square root of both sides to find V:
V = √5.333...
5. Calculate the final value for V:
V = 2.31 kV (rounded to the nearest hundredth)
So, you should charge the 0.600 μF capacitor to a potential of 2.31 kV to store 1.60 J of energy.
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I don't get Physics, can you help me, also i'm a begginer
Answers
This figure shows a
O a. transverse wave
O c. electromagnetic spectrum
Ob. decibel scale
Od compressional wave
Answers
Answer:
transverse i think
Explanation:
This is just a theoretical question, but if there was a superhero that was able to take the potential energies from around them and turn them into kinetic energy what would that look like? Because the Flash takes his potential energy and makes that kinetic energy which makes him fast. So what would it look like to take potential energy from things around them a turn that into kinetic energy? Just curious.
Answers
The conversion of energy can occur by the first law of thermodynamics.
What is the kinetic energy?We have to note that the kinetic energy would have to do with the energy of an object that is in motion. In this case, we can see that we have been told that super hero can be able to turn potential energy into kinetic energy.
This is in obedience to the first law of thermodynamics which states that energy can neither be created nor destroyed rather it can be converted from one form to another.
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Does a wire connected to a dc source, such as a battery, emit an electromagnetic wave?
Answers
The wire connected to the DC source doesn't emit electromagnetic waves.
The electromagnetic wave is an oscillation of electric fields and magnets field that sustains each other, this wave time has the characteristics that it can travel without a material medium, for which they are of extreme importance.
It is caused by DC sources such as batteries only having a constant voltage, it is different from AC sources which have different voltage over time, AC voltage can induce the wire because AC sources have magnetic flux change. DC sources don't have magnetic flux change so they don't emit electromagnetic waves.
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a box is given a push across a horizontal surface. the box has a mass m, the push gives it an initial speed of 1.90 m/s, and the coefficient of kinetic friction between the box and the surface is 0.125.
Answers
The box will eventually come to a stop after traveling a certain distance.
When the box is pushed across the horizontal surface, it experiences a force due to the push. This force overcomes the initial inertia of the box and gives it an initial speed of 1.90 m/s. However, as the box moves, it encounters a frictional force acting in the opposite direction of its motion. The magnitude of this frictional force can be determined using the coefficient of kinetic friction, which is given as 0.125.
The frictional force can be calculated using the equation: frictional force = coefficient of friction * normal force. In this case, the normal force is equal to the weight of the box, which can be calculated using the formula: weight = mass * gravitational acceleration.
As the box moves, the frictional force acts to decelerate it, gradually reducing its speed. The magnitude of the frictional force is proportional to the normal force, which in turn depends on the weight of the box. As the box slows down, the frictional force also decreases until it reaches a point where it matches the applied force, resulting in the box coming to a stop.
Therefore, the box will eventually stop after traveling a certain distance determined by the initial speed, mass of the box, and the coefficient of kinetic friction.
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If an object can make 10 revolutions in two minutes, what’s it’s period?
Answers
Answer:
the answer is 12 second easy