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1) Note: multiple choice question ( options are provided ) A car travels with a constant speed around a curve in the road

Physics

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1) Note: multiple choice question ( options are provided )

A car travels with a constant speed around a curve in the road. The curve is banked. which of the following forces is in the direction of the net force on the car?

a) The centrifugal force

b) The force of gravity

c) The frictional force

d) The x-component of the normal force

e) The x-component of the force of gravity

2)  multiple choice question ( options are provided ) A spring with a force constant of 150.0 N/m 5.7 cma) 860 J

was stretched . The work done to stretch the spring was:

b) 430 J

c) 8.6 J

d) 0.24 J

e) 2437 J

3) A car that is moving north at a constant speed of 20 m/s suddenly

changes directions and moves East without changing speed. If the process takes 10s, what is the magnitude of it's acceleration in m/s ^2?

4) Very confused in this question can someone explain it using a step

by step format and include sig figs as the final answer
a)How much force is required to keep a 780 N box moving at constant velocity across the floor if the friction force between the box and the floor is 160 N?
b)A small land rover, designed to explore the Martian surface, weighs 1.8 x 103 N on Earth. How much will it weigh on Mars, where the gravitational field strength there is 3.3 N/kg?

5) How much work does a waiter perform on a tray of food as they walk across the restaurant floor?

a) Need to know the mass of the tray

b) Force of gravity x distance travelled

c) Same as the kinetic energy of the tray

d) None

6) Two balls collide that where initially moving. After the collision, the balls are both still moving but in different directions. Momentum and Kinetic energy where both conserved. What type of collision happened?

a) Completely inelastic

b) Elastic

c) Inelastic

d) Depends if sound was created