1. you decide to design a playground slide such that the spped of your child rea

Question

1. you decide to design a playground slide such that the spped of your child reaching the boyyom does not exceed 8 m/s. determine the maximum height that the slide can be.

a) 1.8 m

b) 2.9 m

c) 3.2 m

d) 4.5 m

e) 7.4 m

2. as you are sitting on this chair at rest, which force does Newton's third law tell us is equal and opposite to the gravitational force acting on you?

a) the normal force by chair on you

b) the friction force by the chair on you

c) your weight acting on the chair

d) the gravitational force by you on Earth

e) none of the above

3. if you blow up a balloon, and the release it without trying the opening. The balloon will fly away with the air rushing out. This is an illustration of

a) Newton's Second Law

b) Galileo's Las of Interia

c) Newton's Third Law

d) Newton's First Law

e) Newton's Law of universal gravity

4. what does it mean for a physical quantity in a system to be conserved?

a) it is used in the most efficient manner possible

b) the total amount of it in the system stays constant.

c) it stays in its original state forever

d) all of the above

e) none of the above

please show calculations

Explanation / Answer

1) Conserving Energy -> mgh = 1/2*m*v^2

Hence, h = v^2/2g = 8*8/2*10 = 64/20 = 3.2 (answer)

2) the gravitational force by you on Earth

3) Galileo's Las of Interia

4)all of the above

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