Question

Bill pushes Jane. The reaction force to this is

the ground pushes Jane in the same direction

the earth pulls on Bill

the ground pushes Bill backward

Jane pushes Bill the other way

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Question 141 pts

A horse exerts 500 N of force on a heavy wagon. The wagon pulls back on the horse with an equal force. The wagon still accelerates because

the horse pulls on the wagon a brief time before the wagon reacts these

forces are non an action-reaction pair

the wagon does not accelerate because these forces are equal and opposite

nevertheless there is still an unbalanced force on the wagon

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Question 151 pts

Imagine the position function of an object given by the equation, X(t) = -2t + 5.

The velocity of this moving object is

zero

decreasing

increasing

constant

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Question 161 pts

For the previous question, the Acceleration of the moving object is

increasing

constant

zero

decreasing

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Question 172 pts

At an average speed of 65 miles per hour, how far will a car travel in 38 minutes?

Give the answer in feet.

225,155 feet

203,980 feet

212,556

217,360 feet

21,736 feet

Answer 1

1) If A applies force on B, by Newton's third law , B applies force equal and opposite force on B.

Hence ' Jane pushes Bill the other way'

2) Acceleration of an object is due to unbalanced force on it. Hence last option ' nevertheless there is still an unbalanced force on the wagon' is correct.

3) Velocity of an object = dx/dt = -2

Hence velocity is constant.

4) As velocity is constant, acceleration (dv/dt) is zero

5) Distance travelled = average speed * time

= 65(miles per hr) * (38/60) hrs

= 41.17 miles = 41.17*5280 ft

= 217360 ft