Why do we charge a capacitor under a DC voltage source only?

Answer:

Ans is (B) driving a rock from a building

The car is accelerating at 3 m/s² in the positive direction (to the right). By Newton's second law, the net force on the car in this direction is

∑ F = F[a] - F[f] - F[air] = ma

3100 N - 200 N - F[air] = (650 kg) (3 m/s²)

Solve for F[air] :

F[air] = 3100 N - 200 N - (650 kg) (3 m/s²)

F[air] = 3100 N - 200 N - 1950 N

F[air] = 950 N

      Maybe this graph can help?

Photons are reflected back and forth through the lasing medium, which greatly increases the probability of stimulated emission. The correct answer is d.

Placing the lasing material between the two mirrors of an optical cavity allows the photons to bounce back and forth through the lasing medium, increasing the probability of stimulated emission and amplifying the light to produce a laser beam. This process is essential for the sustained laser action. The Pauli exclusion principle and energy quantization may be relevant to the behavior of atoms and electrons in the lasing material, but they do not directly explain the need for an optical cavity. The uncertainty principle and thin-film interference are also not directly related to the function of an optical cavity in laser operation.
To sustain laser action, it is usually necessary to place the lasing material between the two mirrors of an optical cavity because:
d. Photons are reflected back and forth through the lasing medium, which greatly increases the probability of stimulated emission.

The optical cavity allows photons to travel back and forth through the lasing medium, increasing the chances of interacting with excited atoms and causing stimulated emission. This process amplifies the light, leading to the production of a coherent laser beam.

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To make the projectile go three times as high, the spring compression required would need to be nine times the original compression.

The potential energy stored in a compressed spring is directly proportional to the square of its compression. Therefore, to achieve three times the height, we need to increase the potential energy by a factor of nine (3^2 = 9).

Since the potential energy is directly related to the spring compression, we can infer that the spring compression must be proportional to the square root of the potential energy. Therefore, the spring compression required would be three times the original compression, which is equivalent to nine times the original compression in order to achieve three times the height.

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Answer:

1. While boiling replace the cap and allow it to cool. Vapours inside condense and form water creating vacuum above them. Observation - The can crumbles due to air pressure from outside. This proves that air exerts pressure.

2. Measure the volume of the liquid displaced when the object is submerged. Measure the initial volume of water in graduated cylinder. Submerge the irregular object. Measure the final volume of the water.

— The difference between the initial volume and the final volume is the volume of the object.

hope can help ^_^

Answer:

a. Pure white

b. Pure black

c. Hybrid

To increase the change in angular momentum of the system per unit of time, we need to apply a torque to the system. A torque is a force that tends to rotate an object about an axis, and it can be expressed as a vector quantity.

One way to increase the torque on the system is to move the objects further from the axis of rotation. This will increase the distance between the force applied to the second disk and the axis of rotation, which will result in a larger torque on the system. Another way to increase the torque on the system is to apply a force perpendicular to the plane of the disk, rather than a force tangent to the disk.

This will cause the disk to rotate about its own axis, which will result in a larger torque on the system. The system can be changed so that the change in angular momentum of the system per unit of time is increased by moving the objects further from the axis of rotation and applying a force perpendicular to the plane of the disk.  

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Assuming that both cylinders have the same mass and radius, the solid cylinder (object A) will reach the bottom of the ramp first.This is because when the cylinders are rolling without slipping down the ramp, the total kinetic energy of the system is equal to the sum of the translation kinetic energy of the system is equal to the sum of the translation kinetic energy and the rotational kinetic energy.

The translational kinetic energy is proportional to the mass of the cylinder, while the rotational kinetic energy is proportional to the moment of inertia of the cylinder.

For a solid cylinder, the moment of inertia is greater than that of a hollow cylinder with the same mass and radius because the solid cylinder has mass distributed farther from its center of rotation. therefore, the solid cylinder has more rotational kinetic energy than the hollow cylinder for the same velocity, and it will reach the bottom of the ramp first.

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Answer:

the forces are balanced :)

Explanation:

Answer:

that will be  2000m

Answer:1.36078

Explanation:

Answer:

The velocity of the cricket ball is 17.32 m/s

Time is taken by the ball to reach the highest point = 0.8660 seconds

Explanation:

The cricket ball can be seen and treated as a projectile in this case

The maximum height attained by a projectile in motion can be calculated using the formula:

\(h = \frac{v^2 sin^2 \theta }{2g}\)

In any projectile problem, once we know see that the object was released vertically upwards, we need to know that this means that the angle of projection is 90 degrees, and sin 90 is = 1

hence, h will be modified to become

\(h = \frac{v^2 }{2g}\)

\(v = \sqrt{2gh}\)

We are given that h = 15m and g = 10m/s2

\(v = \sqrt{2 \times 10 \times 15} = 17.32m/s\)

The velocity of the cricket ball is 17.32 m/s

B. We can get the time it took to reach the highest point by dividing

time = distance/speed

Time = 15/17.32 = 0.8660 seconds

Answer:

C. 100 ft/min

Explanation:

A scalar quantity has no direction.

A scalar with direction is called a vector.

Answer:

C. 100ft/min

Explanation:

A scalar quantity is a quantity that has a magnitude but no direction, a vector quantity is a quantity that has both a magnitude and a direction. The other three answers are vectors quantities while C. is a scalar.

If the distance between charged particles A and B triples, the static electric force between them will decrease by a factor of 1/9.

The static electric force between two charged particles is inversely proportional to the square of the distance between them. Mathematically, the relationship can be expressed as: F ∝ 1/r^2

Where F is the static electric force and r is the distance between the charged particles.

When the distance triples (r' = 3r), we can calculate the ratio of the new force (F') to the original force (F) as:

F'/F = (1/r'²) / (1/r²) = (r^2) / (r'²) = (r²) / (3r)² = 1/9

Therefore, the static electric force between the charged particles A and B becomes 1/9 of its original value when the distance between them triples.

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Answer:

Joules

Explanation:

Potential energy is energy an object has because of its position relative to some other object. ... Notice that gravitational potential energy has the same units as kinetic energy, kg m2 / s2. In fact, all energy has the same units, kg m2 / s2, and is measured using the unit Joule (J).

Answer:

Good one

Explanation:

Hydrogen has the highest thermal conductivity of any gas.

The kinetic energy depends on the velocity which is in turn dependent on the position of the pendulum bob per time.

Your question is incomplete but has something to do with the kin etic energy of the pendulum.

To calculate the velocity of the pendulum, we need to first determine the amplitude of the pendulum swing, which is the maximum angle of displacement from the equilibrium position.

It's important to note that the kinetic energy of a pendulum is not constant throughout its swing, but rather changes as the pendulum moves back and forth. The maximum kinetic energy is reached at the bottom of the swing when the velocity is at its highest.

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Answer:

true

Explanation:

They played a significant role in the High Gothic cathedrals, perhaps most notably in Chartres Cathedral.  Thus, option A is correct.

They had two purposes: first, to illuminate the interior with a mystical color that symbolized the Holy Spirit, and second, to illustrate Bible stories for the vast majority of the crowd who could not read.

Although “portraits” and emblems were frequently incorporated, the subject in churches was typically religious, and many of the narrative pieces provide insightful glimpses into the medieval age.

Therefore, Churches employed stained-glass windows to add to their beauty and to educate the public through story or symbolism.

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Answer:

Velocity = 94.85m/s

Explanation:

Given the following data ;

Height = 1200m

Vertical distance = 1050m

To find the time, we would use the second equation of motion;

\( S = ut + \frac {1}{2}at^{2}\)

Substituting into the equation, we have;

\( 1200 = 0(t) + \frac {1}{2}*9.8*t^{2}\)

\( 1200 = 0 + 4.9*t^{2} \)

\( 1200 = 4.9*t^{2} \)

\( t^{2} = \frac {1200}{4.9} \)

\( t = \sqrt{122.45}\)

t = 11.07 secs

To find the velocity;

Mathematically, velocity is given by the equation;

\(Velocity = \frac{distance}{time}\)

Substituting into the above equation;

\(Velocity = \frac{1050}{11.07}\)

Velocity = 94.85m/s

Therefore, the velocity of the water above 1050 m over the sea level is 94.85m/s.

This question involves the concepts of th magnetic field and current.

The magnetic field created by the current at the house is "6.75 x 10⁻⁷ T".

The magnetic field created by a current carrying wire can be given by the following formula:

\(B=\frac{\mu_o I}{2\pi r}\)

where,

\(B=\frac{4\pi x\ 10^{-7}(152)}{2\pi(45)}\)

B = 6.75 x 10⁻⁷ T

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Answer:

A and B

Explanation:

The data sets that depict an accelerating object is Data Set A & Data Set B.

The both data sets show that the body is accelerating. Also, they show that the body started from rest (0m/s) at a 0sec.

Data Set A shows a non-constant acceleration which has changing amount of velocity with change in time. While Data Set B shows a constant acceleration which has constant amount of velocity with change in time.

Answer:

New Hampshire

New York.

Virginia.

Minnesota.

Connecticut.

Vermont

New Jersey.

Massachusetts.

Answer:

Minnesota

Explanation:

Answer:

false

Explanation:qualitative is a word or name that describe a quality of the individual while quantitative is a number or something that can be counted or measured from the individual.