3 years ago

A radio tower emits energy in the form of waves. These waves travel great distances. Some of them even leave Earth and travel

Physics

2 answers:

lisabon 2012 [21]3 years ago

7 0

Answer:

a light energy

Explanation:

based of waves traveling

Elena-2011 [213]3 years ago

3 0

Light because it is an electromagnetic wave and they can travel through the vacuum in outer space.

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A 3-kilogram ball is accelerated from rest to a speed of 10 m/sec. What is the ball's change in momentum?

valentina_108 [34]

Change in Momentum = mv - mu.

u = 0, v = 10 m/s. Note ball accelerated from rest, so initial velocity = 0. u =0

Change in Momentum = mv - mu = 3*10 - 3*0 =30.

Change in Momentum = 30 kgm/s.

4 0

3 years ago

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The transfer of the heat by the direct contact of particles of matter is

Anna007 [38]

C.c<span>onduction, is the transfers of heat between substances that are in direct contact.</span>

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3 years ago

Suppose a spacecraft orbits the moon in a very low, circular orbit, just a few hundred meters above the lunar surface. The moon

Finger [1]

Spacecraft will be moving in 1700 m/s.

Option C

<h3><u>Explanation: </u></h3>

The diameter of the moon is 3500 km and the free fall acceleration at the surface is given as $1.6\ \mathrm{m} / \mathrm{s}^2$

The radius will be half of the diameter of the moon that can be written as:

$r_{\text {moon }}=1.75 \times 10^{6}$

By the application of the equation for orbit speed, we get

$\begin{aligned}&v_{\text {orbit}}=\sqrt{r \times q}\\&v_{\text {orbit}}=\sqrt{\left(1.75 \times 10^{6}\right) \times\left(1.6\ \mathrm{m} / \mathrm{s}^{2}\right)}\\&v_{\text {orbit}}=1700\ \mathrm{m} / \mathrm{s}\end{aligned}$