A wheel of diameter 40. 0 cm starts from rest and rotates with a constant angular acceleration of 4rpm. At the instant the wheel has computed its second revolution, compute the radial acceleration of a point on the rim in two ways: (a) using the relationship a_rad = w^2r and (b) from the relationship a_rad = v^2/r

Given:

Height = 53 m

Given that the rock is dropped from the top of a bridge above the river, let's answer the following questions:

• (a). The acceleration of the rock as it falls.

Since the rock is in free fall, the acceleration of the rock as it falls will be the acceleration due to gravity.

a = 9.8 m/s²

Therefore, the acceleration of the rock as it falls is 9.8 m/s².

• (b). How long does it take to hit the water?

To find the time, apply the formula:

Where:

s = 53 m

t is the time

a is the acceleration

u is the initial velocity = 0 m/s

Let's solve for the time, t:

Therefore, the time is 3.29 seconds.

(c). If the rock is dropped horizontally instead, there will be no change in the vertical velocity.

The time will also not change.

The time will be 3.29 seconds

ANSWER:

(a). 9.8 m/s^2

(b). 3.29 seconds

(c). 3.29 seconds

(ahhhggg ignore i dont remember how to delete answers)

No. In my opinion, they were not used creatively. They were used speciously, disingenuously, and unimaginatively.

As always, others are free to disagree.

It depends on two factors: The direction of application of force and the coefficient of friction, \(\mu\), between the object and the surface on which the object is placed.

If the direction of application of force is vertically downwards, then the object will not move for any value of \(\mu\).

If the coefficient of friction is zero, \(\mu=0\), then any value of force that is not in a vertically downward direction, the object will move.

If the direction of application of force is not vertically downwards, then it depends on the value of frictional force.

Answer:

kinetic energy of an object is proportional to the square root of its boiling vocelity

The answer to the correct number of significant figures is 6.774.

When a number(big) divided smaller number, the answer obtained greater than zero is called a quotient.

Divide 143.6 ÷ 21.2

143.6/21.2 = 1436/212

                  =6.77358

The quotient is rounded to three significant figures after decimal

143.6 ÷ 21.2 = 6.774

Thus, the answer to the correct number of significant figures is 6.774

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Answer: C. 39 s

Explanation:

We know the constant speed is 0.22 m/s. We have to get to 8.5 m. We divide 8.5 m by 0.22 = 38.6. After we estimate, 6 is greater than 5, so 39 s.

Answer:

250N

Explanation:

w = mg

m=25

g = 10

w=25x10

w=250

If a student is pulling on an object that has a mass of 25 kg across the floor. Assuming gravity to be 10 m/s², then the weight of the object would be 250 N , therefore the correct answer is option C.

It can be defined as the force by which a body attracts another body toward its center as the result of the gravitational pull of one body and another.

As given in the problem, a student is pulling on an object that has a mass of 25 kg across the floor. Assuming gravity to be 10 m/s2,

The weight of the object = 25 × 10

                                          = 250 N

Thus,  the weight of the object would be 250 N , therefore the correct answer is option C.

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Answer:

27.) Temperature

28.) Rate of Photosynthesis

29.) Rate of Photosynthesis vs. Temperature (°C)

30.) The rate of photosynthesis works optimally at around 25°C.

31.) Caffeine

32.) Mouse wheel revolution

33.) Population B: mice with extra 0.5mL of water

34.) a.) Food, b.) temperature c.) time on wheel (I think the teacher is hinting at water, but population B is given  0.5mL more water.)

35.) If we give mice caffeine, then the mice will run faster because caffeine releases adrenaline.

Explanation:

27.) Independent variables are usually the x-axis, thus it is temperature

28.) Dependent variables are usually the y-axis, thus it is rate of photosynthesis

29.) Easiest way to name graph is y-axis variable v. x-axis variable.

30.) Look at the graph

31.) Only difference is caffeine, thus independent variable is caffeine

32.) They want to see how caffeine affects the speed of the mice, thus the dependent variable is the mouse wheel revolution

33.) The control group are the mice not given the 0.5mL of caffeine.

34.) They said "populations were given the same amount of water, fed identical amount of food, room temperature kept at 24°C." Though I would argue that water is not the same since one group is given more water.

35.)  Read answer.

Answer:

photosynthesis is a processes by which plants get their proteins and

Answer: 1.85 feet

Explanation:

try mass by velocity and Ur answer will come

Answer:

Explanation:

given

m = 6000kg

v = 40 m/

p = ?

solution

p = mv

p = 6000kg × 40m/

p =240000kg.m/

There is no information or context provided about the bulbs in question, so it is not possible to rank them in order of brightness.

The brightness of a bulb depends on a variety of factors, including its wattage, voltage, and type of bulb. Without knowing more information about the bulbs, it is impossible to rank them accurately.Voltage is the difference in electric potential energy between two points in a circuit. It is created by the separation of electric charges, which generates an electric field. The greater the separation of charges, the greater the voltage.

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The dimension of maximum height is M.

The dimension of time of flight is T.

The dimension of range of projectile is M.

The maximum height reached by a projectile is the highest vertical height attained by the projectile.

H = u² sin²θ / 2g

where;

The unit of maximum height is meters, so the dimension will be  M.

The time of flight of a projectile is the total time spent in air by a projectile.

T = 2usinθ / g

The unit of time of flight is seconds, and the dimension will be T.

The range of a projectile is given as;

R = u² sin(2θ) / g

The unit of range of a projectile is meters and the dimension is M.

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How can we relate density and pressure in liquids ??

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Answer:

25km

Explanation:

The person runs 15km Northward

 Turns around and runs 10km southward

The distance is the length of path covered by the person running.

This is given as:

 Distance  = Distance North + Distance South

Distance  = 15km + 10km  = 25km

Answer:

25km

Explanation:

cant explain but ik

The distance of the trip that Kayak travelled at an average speed of 18 mph in 5 hour is 90 miles

First, we shall obtain the eqaution to determine the distance. This can be obtained as follow:

Speed is defined as:

Speed = distance / time

Cross multiply

Distance = speed × time

With the above formula, we can obtain the distance. Details below

The following data were obtained from the question:

Distance = speed × time

Distance = 18 × 5

Distance = 90 miles

From the above calculation, we conclude that the distance traveled is 90 miles

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The derivative of the bowling ball's position-time relationship, x(t), with respect to time (dx/dt), represents the ball's instantaneous velocity as a function of time.

The derivative of x(t) with respect to time, written as dx/dt, tells us the rate of change of the ball's position concerning time. In other words, it gives us the ball's velocity at any given instant. To find the derivative, we differentiate the position function x(t) with respect to time t.

The specific formula for x(t) depends on the given situation, such as the ball's initial position, initial velocity, and any external forces acting on the ball. Once you have the position function x(t), use standard calculus techniques to find its derivative, dx/dt, which will give you the instantaneous velocity as a function of time.

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Answer:

there is no spongy bone

Explanation:

(a) The magnitude of the electric dipole moment is  0.0270 pC m

(b) The difference between the potential energies for the two orientations is 7.38 mJ and U_antiparallel is -3.69 mJ.

(a) The magnitude of the electric dipole moment can be calculated using the formula:

p = q * d

where q is the magnitude of each charge and d is the separation between the charges. Plugging in the values, we get:

p = 3.60 nC * 7.50 * 10^-6 m = 0.0270 pC m

(b) The difference between the potential energies for the two orientations can be calculated using the formula:

ΔU = p * E

where p is the electric dipole moment and E is the electric field strength. The potential energy is proportional to the dot product of the electric dipole moment and the electric field. So when the dipole moment is parallel to the electric field, the potential energy is at a maximum, and when it's antiparallel, the potential energy is at a minimum.

For the orientation parallel to the electric field:

U_parallel = p * E = 0.0270 pC m * 1370 N/C = 3.69 mJ

For the orientation antiparallel to the electric field:

U_antiparallel = -p * E = -0.0270 pC m * 1370 N/C = -3.69 mJ

The difference between the two potential energies is:

ΔU = U_parallel - U_antiparallel = 3.69 mJ - (-3.69 mJ) = 7.38 mJ

So the difference in potential energy between the two orientations is 7.38 mJ.

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If two identical airplanes are loaded such that one has the CG at the forward limit, and the other then the correct answer is: CG will not affect speed.

The position of the center of gravity (CG) affects the stability and control of an airplane, but it does not directly affect its speed. The speed of an airplane is determined by factors such as engine power, aerodynamic design, and external conditions (e.g., wind). The position of the CG primarily influences the longitudinal stability of the aircraft and its tendency to pitch up or down.

Therefore, the speed of the airplanes, in this case, would not be affected by the position of the CG. The airplane with the CG at the forward or aft limit may have different stability characteristics, but their speeds would not be inherently different due to CG placement alone.

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The factors affecting tensile strength in steel plates are manganese content and thickness of the plate. The higher the manganese content and thickness, the higher the tensile strength.

Tensile strength is the maximum stress that a material can withstand while being stretched or pulled before breaking or losing strength. In an experiment to determine the factors affecting tensile strength in steel plates, two factors were measured: the manganese content and the thickness of the plate.The results showed that the tensile strength increased with higher levels of manganese content and thickness. This means that the higher the manganese content and thickness of the plate, the higher the tensile strength. It is important to note that these two factors are not the only ones that affect tensile strength, but they are significant factors that should be considered when designing and manufacturing steel plates.

The maximum stress that a material can withstand before breaking when it is allowed to be stretched or pulled is known as tensile strength.

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Hi friend! I have an iPhone. why do you ask????

If the measure of angle 2 is 8 x 10 and the measure of angle 6 is x&2-38. The measure of angle 8 is also 160 degrees.

Angle 2 is given as 8 x 10, which means it has a measure of 80 degrees (assuming "x" is equal to 10). Angle 6 is given as x&2-38, which means its measure depends on the value of x. To find the measure of angle 8, we need to understand the relationships between these angles.
Based on the diagram, angle 2 and angle 6 are vertical angles. Vertical angles are congruent, meaning they have the same measure. Therefore, if angle 2 measures 80 degrees, then angle 6 also measures 80 degrees.
Angle 8 is adjacent to angle 6 and angle 2. Adjacent angles share a common side. Since angle 2 measures 80 degrees and angle 6 measures 80 degrees, the sum of angle 2 and angle 6 is 80 + 80 = 160 degrees.
Angle 8 is formed by the sum of angle 2 and angle 6. Therefore, t

In summary:
- Angle 2 measures 80 degrees.
- Angle 6 measures 80 degrees.
- The sum of angle 2 and angle 6 is 160 degrees.
- Therefore, angle 8 also measures 160 degrees.

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O.A magnetic field is a region where a magnetic force is exerted on certain objects.

O. A magnetic field behaves like a force vector.

O.Magnetic field lines form closed loops that spread out of the north end of a magnet.

Explanation:

1,2, and 4

Answer:

a,b,d

Explanation:

i took the test

Reference points change based on who is observing because they are subjective and depend on the frame of reference of the observer. A frame of reference is the set of coordinates and axes used to describe the position and motion of objects.

Different observers may have different perspectives, locations, or velocities relative to the observed object, leading to different reference points.

For example, consider two people observing a moving car. If one person is standing still on the sidewalk, their reference point would be the stationary position relative to the car. However, if another person is in a moving car alongside the observed car, their reference point would be the moving car itself.

Therefore, each observer's unique frame of reference affects their perception and measurement of position, velocity, and other physical quantities. Recognizing the relativity of reference points is crucial in understanding how different observers may have different interpretations of the same event or object's motion.

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When the star with a declination of 18 degrees passes your meridian, its altitude is 40 degrees.

To determine the altitude of a star when it passes your meridian, you need to know your latitude and the star's declination.

Latitude is the angular distance between your location on the Earth's surface and the equator. In this case, your latitude is 32 degrees.

Declination is the angular distance between the celestial equator (the projection of the Earth's equator onto the celestial sphere) and the star. In this case, the star's declination is 18 degrees.

When a star passes your meridian, it is directly overhead (at its highest altitude). The altitude of the star is equal to your latitude plus or minus its declination, depending on whether the star is to the north or south of the celestial equator.

In this case, the star's declination (18 degrees) is less than your latitude (32 degrees), so the star is to the north of the celestial equator. Therefore, the altitude of the star when it passes your meridian is:

Altitude = 90 degrees - (Latitude + Declination)

Altitude = 90 degrees - (32 degrees + 18 degrees)

Altitude = 40 degrees

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Answer:

661.25, I believe!

Explanation:

KE = (1/2)(2.5)(23)^2

KE=(1.25)(529)

KE= 661.25

Answer: 7.41 x 10^ -6 N

Explanation: