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3241004551 [841]
3 years ago
8

Jill is pushing a box across the floor. Which represents the upward force perpendicular to the floor?

Physics
2 answers:
tensa zangetsu [6.8K]3 years ago
5 0

Answer:

c fn

Explanation:

the answer is c.....

iragen [17]3 years ago
5 0

Answer: C: Fn

Explanation:

I got it right on the edgenuity quiz

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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}

7 0
3 years ago
A submarine travels 25 km/h north for 3.2 hours. What is its displacement?
Vika [28.1K]

displ = velocity x time

25 x 3.2 = 75+5 km north.

7 0
3 years ago
Read 2 more answers
Two objects of different masses are sitting on different balance scales. Object A has a greater mass than object B. How will the
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As long as they're both on the same planet, the greater mass always has the greater weight.  In this question, Object-A has the greater mass, so it weighs more that Object-B does.

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