2 years ago

What is the speed of a car traveling 31,450 meters in 68450 seconds?

Physics

1 answer:

atroni [7]2 years ago

3 0

Answer:

2,152,752,500 meters per second

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The mini-refrigerator fire was most likely caused by what type of wiring?

Nimfa-mama [501]

Answer: The copper wiring most likely caused the mini-refrigerator fire.

Explanation: A mini-refrigerator may have one or more evaporator fan motors. These motors have copper wiring. In some situation these copper wires gets overheated. It may result to the firing of the mini-refrigerator.

Therefore, the mini-refrigerator fire was most likely caused by copper wiring.

7 0

3 years ago

(a) At what height above Earth’s surface is the energy required to lift a satellite to that height equal to the kinetic energy r

Nikitich [7]

Answer:

Explanation:

Gravitational Potential Energy at earth surface $U_1=\frac{GM_em}{R_e}$

Gravitational Potential Energy at height h is $U_2=\frac{GM_em}{R_e+h}$

Energy required to lift the satellite $E_1=U_1-U_2$

$E_1=\frac{GM_em}{R_e}-\frac{GM_em}{R_e+h}$

Now Energy required to orbit around the earth

$E_2=\frac{1}{2}mv_{orbit}^2=\frac{GM_2m}{2(R_e+h)}$

$\Delta E=E_1-E_2$

$\Delta E=\frac{GM_em}{R_e}-\frac{GM_em}{R_e+h}-\frac{GM_2m}{2(R_e+h)}$

$E_1=E_2$ (given)

$\frac{GM_em}{R_e}-\frac{GM_em}{R_e+h}-\frac{GM_2m}{2(R_e+h)}=0$

$\frac{1}{R_e}-\frac{3}{2(R_e+h)}=0$

$h=\frac{R_e}{2}$

$h=3.19\times 10^6\ m$

(b)For greater height $E_1$ is greater than $E_2$

thus energy to lift the satellite is more than orbiting around earth

4 0

3 years ago

A 60-kg woman stands on the very end of a uniform board, which is supported one-quarter of the way from one end and is balanced.

Tasya [4]

B 30 kg because

One quarter =1/2
Kg=60

1/2 of Kg
1/2*60
30 kg

5 0

2 years ago

The Earths magnetic field deflects the flow of current from?

Zarrin [17]

<span>Most of the earth's fresh water is stored as ice in the Arctic and Antarctic regions of the globe.</span>

5 0

3 years ago

An atom that has an excess positive or negative electrical charge caused by the loss or addition of an electron is called a(n)

maria [59]

Answer:

ion

Explanation:

4 0

3 years ago

Read 2 more answers