Answer to Question #306209 in Mechanics | Relativity for annon

Question

1.) Two forces act on a 55-kg box on a smooth level path. One force has magnitude 50 N directed 45 degrees clockwise from the positive x-axis, and the other has a magnitude 50 N at 45 degrees counter-clockwise from the positive x-axis. What is the net force that causes the box in motion?

a. 0

b. 50 N along positive x-axis

c. 100 N to the right

d. 70 N east

2.) You are in an elevator, standing on a scale, and stuck on 14th floor due to brownout. What is the scale reading?

a. zero

b. greater than the actual weight

c. actual weight

d. less than the actual weight

3.) A roller-coaster car has a mass of 500 kg when fully loaded with passengers. At the bottom of a circular dip of a radius 40m, the car has a speed of 16 m/s. What is the magnitude of the force of the track on the car at the bottom of the dip?

a. 4.9 kN

b. 3.2 kN

c. 1.7 kN

d. 8.1 kN

Answer 1

1. d

2. c

3. d