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jekas [21]
3 years ago
14

A satellite in circular orbit around the Earth moves at constant speed. This orbit is maintained by the force of gravity between

the Earth and the satellite, yet no work is done on the satellite. How is this possible?
a. No work is done if there is no contact between objects.
b. No work is done because there is no gravity in space.
c. No work is done if the direction of motion is perpendicular to the force.
d. No work is done if objects move in a circle.
Physics
1 answer:
scoundrel [369]3 years ago
3 0

Answer:

C. No work is done if the direction of motion is perpendicular to the force.

Explanation:

We know that work is the dot product of force and displacement.

Let's take the angle between the force and the displacement = θ

W= F . d cosθ

F=Force  , d=Displacement  

If θ = 0° then W= F.d

If θ = 90° then W= 0

So we can say that when force is perpendicular to the displacement then the work done by force will be zero.

Therefore the answer is C.

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Answer:

The standard acceleration due to gravity (or standard acceleration of free fall), sometimes abbreviated as standard gravity, usually denoted by ɡ0 or ɡn, is the nominal gravitational acceleration of an object in a vacuum near the surface of the Earth. It is defined by standard as 9.80665 m/s2 (about 32.17405 ft/s2).

Explanation:

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3 years ago
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Compare and contrast the two different types of mechanical waves?
prohojiy [21]
There are longitudinal and transverse.  Both types of mechanical waves require a medium, transport energy, and have defined wavelengths, frequencies, and speeds.
Differences are that transverse waves oscillate along a direction perpendicular to the direction of travel (like shaking a rope up and down).  Longitudinal waves like oscillations along a spring and sound waves, oscillate back and forth along the direction of travel. 
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3 years ago
The root-mean-square value of an alternating current of S0Hz frequency is 10 ampere. The time taken by the alternating current i
stealth61 [152]

Answer:

(D ) 5\times10^{-3} sec and 14.14 amp.

Explanation:

Given that, the rms value of current is 10 ampere and its frequency is 50 Hz.

Now maximum value of current can be calculated as,

I_{max}=\sqrt{2}I_{rms}\\I_{max}=10\times \sqrt{2}  \\I_{max}=14.14 amp.

The time period is defined as,

T=\frac{1}{f}\\ T=\frac{1}{50}\\ T=0.02 sec

Now the time taken by alternating current going from zero to maximum value is,

t=\frac{T}{4}\\ t=\frac{0.02}{4}\\ t=5\times 10^{-3}sec

Therefore, the time taken by alternating current to reach maximum value is t=5\times 10^{-3}sec and the peak value of current is 14.14 amp..

7 0
3 years ago
What does a genus have
stiks02 [169]

1. Monophly - all descendants of an ancestral talon are grouped together (i.e. phylogenetic analysis should clearly demonstrate both monophyly and validity as a separate lineage).

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7 0
3 years ago
How much heat is needed to increase the internal energy of a gas in a piston by 4,736J if the gas does 750J of work on the envir
kykrilka [37]

The heat absorbed by the gas is 5486 J

Explanation:

We can solve this problem by using the 1st law of thermodynamics, which states that the change in internal energy of a gas is given by:

\Delta U = Q-W

where:

\Delta U is the change in internal energy

Q is the heat absorbed by the gas

W is the work done by the gas

In this problem, we have:

\Delta U = +4736 J is the increase in internal energy of the gas

W=+750 J is the work done by the gas (positive because the gas is doing work on the surroundings, by expanding)

Solving for Q, we find the heat needed:

Q=\Delta U + W = 4736+750=5486 J

And the positive sign tells us that this heat is absorbed by the gas.

Learn more about thermodynamics:

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#LearnwithBrainly

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