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2 years ago

According to the law of conservation of energy,

Physics

2 answers:

vodka [1.7K]2 years ago

8 0

According to the law of conservation of energy,

A. an object loses most of its energy as friction

B. the total amount of energy for a system stays the same

Energy is never lost due to the law of conservation

C. the potential energy of an object is always greater than its kinetic energy

D. the kinetic energy of an object is always greater than its potential energy

antiseptic1488 [7]2 years ago

4 0

Answer:

B) The total amount of energy for a system stays the same. According to the Law of Conservation of Energy, energy is never lost.

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Friction is a ____________ force a. Artificial b. Natural c. Pessimistic d. Negative

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Answer:

natural is the answer

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1 year ago

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2 years ago

Explain what happens to the pitch of a cell phone ring when the wavelength of a sound wave increases

max2010maxim [7]

You get a more low sound.

Conversely, when the wavelength becomes shorter you get a more treble sound.

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a large parallel plate capacitor has plate seperation of 1.00 cm and plate area of 314 cm^2. The capacitor is connected across a

Whitepunk [10]

Answer:

$W = -2.76\times 10^{-9}~J$

Explanation:

The work done on the capacitor is equal to the difference in potential energy stored in the capacitor in two different cases.

The potential energy is given by the following formula:

$U = \frac{1}{2}CV^2$

where C can be calculated using the plate separation and area.

$C = \epsilon\frac{A}{d} = \epsilon\frac{0.0314}{0.01} = 3.14\epsilon$

Therefore, the potential energy in the first case is

$U = \frac{1}{2}3.14\epsilon (20)^2 = 628\epsilon$

In the second case:

$C_2 = \epsilon\frac{A}{d} = \epsilon\frac{0.0314}{0.02} = 1.57\epsilon\\U = \frac{1}{2}C_2 V^2 = \frac{1}{2}1.57\epsilon (20)^2 = 314\epsilon$

The permittivity of the air is very close to that of vacuum, which is 8.8 x 10^-12.

So, the difference in the potential energy is

$W = U_2 - U_1 = \epsilon(314 - 628) = -314 \times 8.8 \times 10^{-12} = -2.76\times 10^{-9}~J$

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2 years ago

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Oliga [24]

You never gave us an answer, so therefore, we can't answer this question.

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