Hello, kindly please answer all the questions that I need help with...

Question

# Hello, kindly please answer all the questions that I need help with...

Hello,

kindly please answer all the questions that I need help with it, thank you so much!!

Before you answers the questions make sure all the answers are corrected, because I had a bad memory yesterday so please make sure all the answers are corrected!! Moreover, I need just the answers not the explanations. just the answers!!! Thank you so much for helping me!!

1) An object of mass 3.80 kg is projected into the air at a 55.0° angle. It hits the ground 3.40 s later. Set "up" to be the positive y-direction. What is the y-component of the object's change in momentum while it is in the air? Ignore air resistance. ( blank )kg⋅m/s

2) For a safe reentry into Earth's atmosphere, the pilots of a space capsule must reduce their speed from 2.60 × 104 m/s to 1.10 × 104 m/s. The rocket engine produces a backward force on the capsule of 1.60 × 105 N. The mass of the capsule is 3410 kg. For how long must they fire their engine? Ignore the change in mass of the capsule due to the expulsion of exhaust gases. ( blank )s

3) A 3.00-kg object is initially moving northward at 15.0 m/s. Then a force of 15.0 N, toward the east, acts on it for 4.90 s.

a- At the end of the 4.90 s, what is magnitude of the object's final velocity? ( blank ) m/s

b- What is the direction of the final velocity? Enter the angle in degrees where positive indicates north of east and negative indicates south of east. degree

c- What is the change in momentum during the 4.90 s? Take +y to be north and +x to be east. Enter a positive answer if the change in momentum is toward east and a negative answer if the change in momentum is toward west. (blank)  kg·m/s

4) A tennis ball of mass 0.0641 kg is served. It strikes the ground with a velocity of 54.0 m/s (120 mi/h) at an angle of 22.0° below the horizontal. Just after the bounce it is moving at 53.0 m/s at an angle of 18.0° above the horizontal.

a-If the interaction with the ground lasts 0.0630 s, what is the magnitude of the average force exerted by the ground on the ball? (blank) N

b-If the interaction with the ground lasts 0.0630 s, in what angle does the average force exerted by the ground on the ball act?

(Click to select)   0.529   89.5   0.823   80.3  ° above the horizontal in the direction of motion

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