Question

In: Physics

1-A bullet moving horizontally with a speed of 600 m/s strikes a sandbag and continues for...

1-A bullet moving horizontally with a speed of 600 m/s strikes a sandbag and continues for a distance of 20 cm.

A-What is the average acceleration of the bullet?

B-How long does it take to come to rest?

2-A 45.0 kg skier, starting from rest, begins skiing straight down an incline on the mountain of 12.5. The coefficient of kinetic friction between skis and snow is 0.08.

A-Draw a free body diagram of the skier and the forces acting on the skier.

B-Calculate the Normal force acting on the skier

C-Calculate the force of kinetic friction acting on the skier

D-Calculate the acceleration of the skier

E-The skier travels a distance of 150 m down the mountain. What is her final speed after 150?

Solutions

Expert Solution

1)

Initial velocity of bullet ,u =600m/s

final velocity ,v =0m/s

s= 20cm =0.2m

(A) Average acceleration of the bullet?

Use Formula ,

ANSWER:

------

(B)Time?

Use Formula

ANSWER:

======================

2)

(A)

(B)Calculate the Normal force acting on the skier

Normal Force,

ANSWER:

=====================

(C) Calculate the force of kinetic friction acting on the skier

Frictional Force =coefficient of kinetic friction * Normal Force

ANSWER:

======================

(D) Calculate the acceleration of the skier

Consider the skier

Net Force =Mass*acceleration

ANSWER:

===================

(E)The skier travels a distance of 150 m down the mountain. What is her final speed after 150m?

Initial velocity ,u =0m/s

Use Formula

ANSWER:

=================

genius_generous answered 1 year ago
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