HELP!!!What type of image is formed by a lens if m=-0.87?
A. The image is smaller than the object and is real
B. The image is smaller than the object and is virtual
C. The image is larger than the object and is virtual
D. The image is larger than the object and is real

Answer:

1)  The block of wood is at rest.

2)  Weight and Normal Reaction (see attached diagram).

Explanation:

Assumptions

Question 1

"At rest" or "resting" means that the object isn't moving.

Therefore, the block of wood is at rest.

Question 2

Forces that are acting on the block of wood:

See attached diagram.

Answer:

5 years\(\)

Answer:

f

Explanation:

back in da 6th grade i got dem bad grades i was in love with my tutor!

Answer:

Explanation: Please help me

The Saturn V rocket got faster as more fuel burned due to a combination of factors, including the decreasing mass of the rocket and the conservation of momentum.

As the rocket burned its fuel, its mass gradually decreased. Since the force generated by the engines remained constant, the acceleration experienced by the rocket increased due to Newton's second law of motion (F = ma). This means that as the mass of the rocket decreased, the acceleration increased, resulting in the rocket gaining speed.

Additionally, as the rocket climbed higher into the atmosphere, the air resistance it encountered decreased, allowing the rocket to accelerate more quickly. The air resistance force acting against the rocket decreases because the air density becomes thinner as the altitude increases.

Furthermore, the principle of conservation of momentum played a role in the increasing speed of the Saturn V rocket. As the rocket burned fuel, the exhaust gases were expelled at high velocity, causing the rocket to gain momentum in the opposite direction. Since the rocket's mass was decreasing, this additional momentum translated into a higher velocity.

In summary, the Saturn V rocket got faster as more fuel burned due to the decreasing mass of the rocket, reduced air resistance, and the conservation of momentum. The rocket's acceleration increased as the mass decreased, while the air resistance decreased and the momentum gained from expelling exhaust gases contributed to the increasing velocity.

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Answer:

\(q_1=\pm0.03 \mu C\) and \(q_2=\pm0.02 \mu C.\)

Explanation:

According to Coulomb's law, the magnitude of  force between two point object having change \(q_1\) and \(q_2\) and by a dicstanced is

\(F_c=\frac{1}{4\pi\spsilon_0}\frac{q_1q_2}{d^2}-\;\cdots(i)\)

Where, \(\epsilon_0\) is the permitivity of free space and

\(\frac{1}{4\pi\spsilon_0}=9\times10^9\) in SI unit.

Before  dcollision:

Charges on both the sphere are \(q_1\) and \(q_2\), d=20cm=0.2m, and \(F_c=1.35\times10^{-4}\) N

So, from equation (i)

\(1.35\times10^{-4}=9\times10^9\frac{q_1q_2}{(0.2)^2}\)

\(\Rightarrow q_1q_2=6\times10^{-16}\;\cdots(ii)\)

After dcollision: Each ephere have same charge, as at the time of collision there was contach and due to this charge get redistributed which made the charge density equal for both the sphere t. So, both have equal amount of charhe as both are identical.

Charges on both the sphere are mean of total charge, i.e

\(\frac{q_1+q_2}{2}\)

d=20cm=0.2m, and \(F_c=1.406\times10^{-4}\) N

So, from equation (i)

\(1.406\times10^{-4}=9\times10^9\frac{\left(\frac{q_1+q_2}{2}\right)^2}{(0.2)^2}\)

\(\Rightarrow (q_1+q_2)^2=2.50\times10^{-15}\)

\(\Rightarrow q_1+q_2=\pm5\times 10^{-8}\)

As given that the force is repulsive, so both the sphere have the same nature of charge, either positive or negative, so, here take the magnitude of the charge.

\(\Rightarrow q_1+q_2=5\times 10^{-8}\;\cdots(iii)\)

\(\Rightarrow q_1=5\times 10^{-8}-q_2\)

The equation (ii) become:

\((5\times 10^{-8}-q_2)q_2=6\times10^{-16}\)

\(\Rightarrow -(q_2)^2+5\times 10^{-8}q_2-6\times10^{-16}=0\)

\(\Rightarrow q_2=3\times10^{-8}, 2\times10^{-8}\)

From equation (iii)

\(q_1=2\times10^{-8}, 3\times10^{-8}\)

So, the magnitude of initial charges on both the sphere are \(3\times10^{-8}\) Coulombs\(=0.03 \mu C\) and \(2\times10^{-8}\) Colombs or \(0.02 \mu C\).

Considerion the nature of charges too,

\(q_1=\pm0.03 \mu C\) and \(q_2=\pm0.02 \mu C.\)

Final speed of the combined child, sled, and snowman system is given by:  v_final = (m1 * sqrt(2 * g * H)) / (m1 + m2)

Explanation:

To find the final speed of the combined child, sled, and snowman system, follow these steps:

step1: Calculate the gravitational potential energy (PE) of the child and sled at the top of the hill: PE = m1 * g * H, where   g is the acceleration due to gravity.

step2: Since there is no friction, the potential energy will convert into kinetic energy (KE) at the bottom of the hill: KE = 0.5 * m1 * v1^2, where v1 is the speed of the child and sled at the bottom of the hill.

step3: Equate the potential and kinetic energies: m1 * g * H = 0.5 * m1 * v1^2. Solve for v1: v1 = sqrt(2 * g * H).

step4: Use the conservation of momentum principle for the collision between the sled and the snowman: m1 * v1 = (m1 + m2) * v_final, where v_final is the final speed of the combined system.

step5: Substitute the expression for v1 from step 3 into the momentum equation and solve for v_final: v_final = (m1 * sqrt(2 * g * H)) / (m1 + m2).

Thus, the final speed of the combined child, sled, and snowman system is given by: v_final = (m1 * sqrt(2 * g * H)) / (m1 + m2).

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The frequency of the motion is 2.45 Hz.

The frequency of the motion can be calculated using the formula:

f = (1 / 2π) * √(k / I)

Where:

f is the frequency in hertz,

k is the torsion constant in newton-meters per radian, and

I is the moment of inertia of the cylinder.

To find the moment of inertia, we need to consider the geometry of the hollow cylinder. The moment of inertia for a hollow cylinder rotating about its central axis is given by the formula:

I =\((m * R^2) * (1 - (r^2 / R^2))\)

Where:

m is the mass of the cylinder,

R is the radius of the cylinder, and

r is the radius of the hollow part of the cylinder.

Plugging in the given values, we have:

m = 430 g = 0.43 kg

R = 1.4 cm = 0.014 m

r = 0 cm (since the cylinder is solid)

Calculating the moment of inertia:

I =\((0.43 * 0.014^2) * (1 - (0^2 / 0.014^2))\) = 0.00012722 kg·m²

Now we can calculate the frequency of the motion:

f = (1 / 2π) * √(350 / 0.00012722) ≈ 2.45 Hz

Therefore, the frequency of the motion is approximately 2.45 Hz.

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Answer: The molecules in gases are different from other states of matter

Explanation:

The molecules in gases are different from other states of matter because unlike, for example, a solid, they move around freely and are much more spread apart. A gas can fill up any container, but once the container is unsealed, the gasses will immedietly be let out. Gases can be compressed much more easily than a solid or a liquid.

Explanation:

The student made a model of an electric generator.

Student has made a model of a generator. Hence option B is Correct.

What is Faraday's law ?

Faraday's law states that "change in a magnetic field produces electric field in the circuit". It can also be stated as " when magnetic flux linked to a circuit changes, an electromotive force is induced in the circuit which is proportional to the rate of change of the flux.

When a conducting coil is moved in the magnetic field, according to faraday's law of induction we get current in the coil. When we move coil inside the magnetic field, lines of force of magnetic field is cut by the coil as a result it drives electron in the coil causes current it in the coil.

Hence in this picture we are moving coil and we are getting electricity, Hence mechanical energy is converting into electric energy. this is done by the generator. Hence option B is correct.

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The strength and direction of the electric field inside the membrane just before the stimulus is zero.

An electric field is a region of space around a charged particle or object that exerts an electric force on other charged objects within its vicinity. Electric fields are created by differences in electric potential, which is the amount of energy contained within a region of space due to the presence of electric charge. Electric fields are represented by lines of force, which indicate the direction of the force and its magnitude. Electric fields are measured in units of volts per meter (V/m).

This is because in the resting state, the membrane potential is in equilibrium, meaning that the total electric field inside the membrane is equal to zero. This is due to the fact that the concentration of positive and negative ions on both sides of the membrane are equal, so the electric field created by the positive ions is canceled out by the electric field created by the negative ions.

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The half life of carbon -14 is 5700 years. Then the decay constant is 0.0002 yrs⁻¹. The time period it takes to reach a count of 150 from 200 will be 2937 years.

Half life of a radioactive isotope is the time required to decrease half of its initial amount.  The radioactive decay is a first order reaction. Hence the time of decay is written  as:

t = 1/k ln W0/Wt

where Wt and W0 be the final and initial amounts respectively.

Decay constant k = 0.693/t1/2

k = 0.693/5700 yrs = 0.0002 yrs⁻¹.

W0 = 200

Wt = 150

Then,

t = 1/ 0.0002 yrs⁻¹.ln (200/150) = 2397 years.

Therefore, after 2397 years later the second count was done for the sample.

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Answer:

Part A

Coriolis effect is used to describe how objects which are not fixed to the ground are deflected as they travel over long distances due to the rotation of the Earth relative to the 'linear' motion of the objects

Due to the Coriolis effect the wind flowing towards the Equator from high pressure belts in the subtropical regions in both the Northern and Southern Hemispheres are deflected towards the western direction because the Earth rotates on its axis towards the east

Part B

In the Northern Hemispheres, the winds are known as northeasterly trade winds and in the Southern Hemisphere, they are known as the southeasterly trade wind. Therefore, Coriolis effect has the same effect on the direction of the Trade Winds in the Southern Hemisphere as it does in the Northern Hemisphere

Explanation:

Answer:

c

Explanation:

wavelength shorter means energy is higher

the wavelength

radio waves>microwave>infrared rays>gamma rays

The correct statement, given the data from the question is:

The forces are the same (Option B)

Newton's third law of motion states that to every action, there is an equal an opposite reaction.

From the law given above, we can say that if a 50 N is applied to hit an object, the object is also returning a 50 N on the hitter.

Considering the question given above, we can thus conclude, haven understood Newton's third law of motion, that the force of the large truck on the small car is the same.

Thus, the correct answer to the question is Option B: The forces are the same.

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U₂ = 0 V. The lamp (L₂) is short circuited, meaning that there is no resistance between its terminals. As such, the voltage across its terminals must be zero.

Resistance is a concept in physics that measures the opposition to the flow of electric current, heat, light, sound, or any other form of energy or matter. It is the measure of how much an object, material, or system resists the flow of electric current, heat, light, sound, or any other form of energy or matter.

a) U₂ = 0 V. The lamp (L₂) is short circuited, meaning that there is no resistance between its terminals. As such, the voltage across its terminals must be zero.

b) U₁ = 12 V. Since the generator is providing a constant voltage of 24 V across its terminals, the voltage across the terminals of (L₁) will be half of this, i.e. 12 V. As the lamps are identical, the current I' through the circuit will also be 0.6 A.

c) (L₁) may burn out due to the large amount of current it is carrying. If the current is too high, it may exceed the rated capacity of the lamp and lead to its failure.

d) (L₁) does not burn out because the circuit includes a fuse. The fuse is designed to break the circuit in the event of an excessive current, thus protecting the lamp from burning out. When the fuse blows, the circuit is broken and the lamp will be off.

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Answer:

p = 4000 kg-m/s

Explanation:

Given that,

The mass of a truck, m = 200 kg

Speed of the truck, v = 20 m/s

We need to find the momentum of the truck. The formula for momentum is given by :

p = mv

so,

\(p=200\times 20\\\\p=4000\ kg-m/s\)

So, the momentum of the truck is equal to 4000 kg-m/s.

Storm tide is the storm surge astronomical tide waves.

Storm surge is the unusual rise in seawater level amid a storm, measured as the height of the water over the ordinary anticipated astronomical tide. The surge is caused basically by a storm’s winds pushing water coastal. The sufficiency of the storm surge at any given area depends on the introduction of the coastline with the storm track: the size, intensity, and speed of the storm. Storm tide is the full observed seawater level amid a storm, coming about from the combination of storm surge and the astronomical tide. Astronomical tides are caused by the gravitational drag of the sun and the moon and have their most prominent impacts on seawater level amid new and full moons.

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Answer:

sequence

Explanation:

sequences are the way in which things are ordered, for example: 1, 2, 3, 4 is a sequence:)

The number of significant figures in the calculation for the perimeter should match the least number of significant figures among the measurements, which is 2. Therefore, the calculation for the perimeter should be reported with 2 significant figures.

When performing calculations, it is important to consider the rules of significant figures. The rule states that the result of a calculation should be rounded to match the least number of significant figures in the given measurements.

In the given measurements, the least number of significant figures is 2, which is found in Side 3 (2.000 m). Therefore, when calculating the perimeter of the seven-sided figure, the result should be rounded to 2 significant figures.

For example, if the calculated perimeter is 41.756 meters, it should be rounded to 42 meters since 2 is the least number of significant figures. This ensures that the result aligns with the precision of the measurements provided.

By adhering to the rules of significant figures, we can maintain consistency and accuracy in our calculations and ensure that the level of precision is appropriate for the given data.

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Answer:

Because it’s imposible

The wind velocity that will tip the truck over to its side is approximately 45.6 m/s. This is calculated by considering the torque exerted by the wind on the truck's side surface and comparing it to the torque due to the weight of the truck.

To determine the wind velocity that will tip the truck over, we need to calculate the critical wind speed at which the torque exerted by the wind on the truck's side surface overcomes the torque due to the weight of the truck.

The torque due to the wind can be calculated using the equation:

Torque (wind) = (1/2) * air density * velocity² * projected area * moment arm

The torque due to the weight of the truck can be calculated using the equation:

Torque (weight) = weight * moment arm

For tipping to occur, the torque due to the wind must exceed the torque due to the weight of the truck. Therefore, we set the two torques equal to each other and solve for the wind velocity.

(1/2) * air density * velocity² * projected area * moment arm = weight * moment arm

Simplifying the equation, we find:

velocity² = (2 * weight * moment arm) / (air density * projected area)

Substituting the given values:

weight = 5000 kg

moment arm = 0.75 m

air density = 1.1 kg/m³

projected area = length * height = 9 m * 2.5 m = 22.5 m²

We can now calculate the wind velocity:

velocity²  = (2 * 5000 kg * 0.75 m) / (1.1 kg/m³ * 22.5 m²)

velocity² = 204.55

velocity ≈ √204.55 ≈ 14.3 m/s

Therefore, the wind velocity that will tip the truck over to its side is approximately 14.3 m/s.

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The current in the circuit is 0.1875 amperes or 187.5 milliamperes.

To calculate the current in this circuit, we can use Ohm's Law, which states that the current (I) flowing through a resistor is equal to the voltage (V) across the resistor divided by its resistance (R). In this case, we have two resistors connected in series, so the total resistance (R) is the sum of the individual resistances: 3.0 + 5.0 = 8.0 ohms.
Next, we can use the voltage of the battery (V) as our input, which is 1.5 V. Plugging in the values,

we get: I =\frac{ V}{R }

I= \frac{1.5}{8.0}

I = 0.1875 A (or 187.5 mA).

Therefore, the current in the circuit is 0.1875 amperes or 187.5 milliamperes.
It's important to note that the current is the same throughout the circuit since the resistors are connected in series. Additionally, since the voltage of the battery remains constant, the current flowing through the resistors also remains constant, provided that the resistance of the circuit does not change.

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Answer:

formual is

V = IR

V = 3*15

V= 45 V

hope it helps

Answer:

1 and 2

Explanation:

The formula itself has nothing to do with shape or temperature. The formula does have mass and the speed depends on the how great the mass/radius is.

The kinetic energy of the truck is 44,287,500 J as per the given data.

The energy an object has as a result of motion is known as kinetic energy. A force must be applied to an object in order to accelerate it.

The kinetic energy (K) of an object can be calculated using the formula:

\(K = 0.5 Xm X v^2\)

Where,

m = mass of the object

v = velocity

Plugging in the values given in the question, we have:

\(K = 0.5 X 2900 X (55 m/s)^2\)

\(K = 0.5 X 2900 X 3025 m^2/s^2\)

K = 44,287,500 J (joules)

So, the kinetic energy of the truck is 44,287,500 J.

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Answer: The whole of it was owned originally by the lord of the manor. He lived in the big house called the manor house. Attached to it were many acres of grassland and woodlands called the park. These were the "demesne lands" which were for the personal use of the lord of the manor.

The lord of the manor previously owned the entire property. He resided in the substantial home known as the manor house.

Thus, The park, which covered many acres of grassland and trees, was connected to it. These "demesne lands" belonged to the lord of the manor and were used exclusively for his exclusive purposes.

The word "manor" is derived from the Old French word "manoir," which means "dwelling place," but a manor isn't just any old house.

The homes and grounds of the nobility were referred to as manors back when people still had titles of nobility. expressing to someone that his home is a manor is the equivalent of expressing that it is so lavish and beautiful that it could have belonged to a lord.

Thus, The lord of the manor previously owned the entire property. He resided in the substantial home known as the manor house.

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Answer:

1

Explanation:

Answer:

The angle between the incoming light

and the normal

The phrase "like dissolves like" can be described as the compounds which have similar nature dissolve in each other that is polar dissolves polar and non-polar dissolves non-polar molecules.

Polarity is the separation of electric charge which is leading to a molecule or the chemical groups which are having an electric dipole moment, with a negatively charged end and a positively charged end as well. Polar molecules are the molecules which must contain one or more polar bonds which occur due to a difference in the electronegativities between the bonded atoms of the molecule.

A simple way to predict the compounds which will dissolve in other compounds is the phrase of the compound such as "like dissolves like". This means that the polar compounds dissolve in polar compounds, and the nonpolar compounds dissolve in nonpolar compounds, however, the polar and nonpolar molecules do not dissolve in each other.

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A traditional ceiling construction type is common in homes. These ceilings have a standard drywall finish and are made of less expensive materials, necessitating simple installation.

T1sin = T2sin in equilibrium, and T1cos + T2cos = mg.

Geometry yields sin = 11/16, sin = 7/8, and sin = 7/8, respectively.

T1 = T214/11 and T2 = 100 (14*0.73/11 + 0.48)

T2 = 71 N and T1 = 90 N, respectively.

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