PHY 2053 Fall 2017 Homework 2 (Due in workshop before exam 10/16 or 10/19) Chapt

Question

PHY 2053 Fall 2017 Homework 2 (Due in workshop before exam 10/16 or 10/19) Chapters 4-6 To get full credit, show your work for each problem. Chapter 4 1) A satellite is in orbit around the earth. Which feels the greater force, the satellite or the earth? 2) The figure below shows two boxes, with m]> m2, that are on a level frictionless surface. We can apply a horizontal force i either toward the right on m] or toward the left on m2. The magnitude of the force that the boxes exert on each other is (a) zero Newtons in either case. (b) larger if ? is applied toward the right. (c) larger if F is applied toward the left. (d) the same in either case. my 3) Inside of a train a ball of weight W is hanging by a light wire at rest from the ceiling. The wire makes an angle with the ceiling, as shown in the figure below. What is the tension T in the wire? A 1200-kg car is pulling a 500-kg trailer along level ground. Friction of the road on the trailer is negligible. The car accelerates with an acceleration of 1.3 m/s2. What is the force exerted by the car on the trailer? 4)

Explanation / Answer

(1) Consider mass of earth = M

And mass of satellite = m

The distance between the two = d meter.

So, by the universal law of gravitation, the force between the two is -

F = (G*M*m) / d^2

where G is the gravitational constant.

The force F will be the same for the earth and the satellite.

Therefore, the earth and the satellite will feel equal amount of force F.

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