2 years ago

1. Why do satellites not need to fire their rockets once they’re in orbit?

1 answer:

8 0

Answer:

1.A satellite maintains its orbit by balancing two factors: its velocity and the gravitational pull that Earth has on it.

I'm sorry I only know the first one

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A(n) 0.47 kg softball is pitched at a speed of 10 m/s. The batter hits it back directly at the pitcher at a speed of 29 m/s. The

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Answer:

18.33 Ns

Explanation:

As the pitch back speed has the opposite direction as before, the change in velocity would be

$\Delta v = v_2 - v_1 = 29 - (-10) = 39 m/s$

So the change in momentum of the ball would be the product of its velocity change and its mass

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This is equals to the impulse acted on the ball by the bat, which is 18.33 Ns

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2 years ago

A person with a gravitational force of 750 N is sitting in the centre of a hammock which is strung between two trees. The ropes

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2 years ago

The energy of a photon is proportional to its a) amplitude. d) wave number, k-2m/A c) velocity. b) frequency

Scilla [17]

Answer:

Frequency

Explanation:

Photons are the packet of energy. They are massless and chargeless particles. They travel in the vacuum with the speed of light. The energy of photon is given by :

$E=h\nu$

Where

h = Planck's constant

$\nu$ = frequency of photon

Or $E=\dfrac{hc}{\lambda}$

c = speed of light

$\lambda$ = wavelength of photon

From the above equation, it is clear that the energy of photon is directly proportional to its frequency.

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2 years ago