Pls help me fast and correct

Physics

1 answer:

bekas [8.4K]2 years ago

4 0

Answer:

Explanation:

due to position at height is the answer

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Marvin lifts a box over his head. The work done on the box is- -Negative work -No work -Positive work

NemiM [27]

Answer:

Positive work

Explanation:

When work and the exerted force are in the same direction, then the work done is positive.

In the question, we understand that Marvin lifts a box up (i.e. over his head). The force to lift the box acts in the upward direction and the work done itself is also in the upward direction (from the floor to Marvin's head).

Since these two are in the same direction, then we can conclude that the work done is positive.

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What is your hypothesis (or hypotheses) for this experiment? (Lab was on Newton’s first two laws of motion)

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My hypothesis is the water would change color and starts to boil or it could be an experiment that may glow up in the dark.

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a 5.00 × 105 kg rocket is accelerating straight up. Its engines produce 1.50 × 107 of thrust, and air resistance is 4.50 × 106 N

Angelina_Jolie [31]

This one is simple :)

use the equation F = ma and then re-arrange for a.

a = F / m

But there is a trick, so be careful. the question gives you wind resistance. Simply subtract the wind resistance from the thrust of the rocket to get the net force upward.

$1.50 * 10^7N - 4.5 8 10^6N = 1.05 * 10^7N$

So,

$a = \frac{F}{m} = \frac{1.05*10^7N}{5.00*10^5kg}$