3 years ago

Help ME QUICK PLEASE QUESTION 2 AND 4 PLEASE 58 POINTS

Physics

1 answer:

monitta3 years ago

6 0

Answer:

For number 4: A vector pointing to the right with a magnitude of 2.0

Explanation:

Very simple- just subtract 6-2

I am not sure how to do #2- sorry!

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13. How many electrons does a complete third electron shell hold?

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Answer:

A) 8

A complete third electron shell holds 8 electrons

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2 years ago

Determine W (or fuel energy) required to launch a satellite of mass m at rest from a launching pad placed at the surface earth,

jeka57 [31]

Answer:

5. 9GmM/(10R)

Explanation:

m is the mass of the satellite

M is the mass of the earth

W is the energy required to launch the satellite

Energy at earth surface = Potential energy (PE) + W

W = Energy at earth surface - Potential energy (PE)

But PE = $-\frac{GMm}{R}$

Therefore: W = Energy at earth surface - $\frac{GMm}{R}$

Energy at earth surface (E) at an altitude of 5R = $-\frac{GMm}{5r} +\frac{1}{2}mV^2$

But $V=\sqrt{\frac{GM}{5R} }$

Therefore: $E=-\frac{GMm}{5R}+\frac{1}{2}m(\sqrt{\frac{GM}{5R} } )^2= -\frac{GMm}{5R}+\frac{GMm}{10R} = -\frac{GMm}{10R}$

W = E - PE

$W=-\frac{GMm}{10R}-(-\frac{GMm}{R})=-\frac{GMm}{10R}+\frac{GMm}{R}=\frac{9GMm}{10R} \\W=\frac{9GMm}{10R}$

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3 years ago

How far will a ball travel that goes 35 meters per second for 18 seconds?

katen-ka-za [31]

Theoretically, 35 x 18 = 630

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3 years ago

What does it mean to say that momentum is conserved?

balu736 [363]

The momentum of two or more objects during collisions is not lost nor gained

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3 years ago

A 5,400 W motor is used to do work. If the motor is used for 640 s, about how much work could it do?

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Answer:

3,500,000 J

Explanation:

WORK = POWER * TIME

WORK= 5400 * 640

=6456000 J = 3,500,000 J

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3 years ago