Question

Physics Assignment Questions
1. A 180 kg car drags a 500 kg sled. The car exerts a horizontal force of 4010 N against the ground in order to accelerate.
The kinetic coefficient of friction for the sled is 0.285.

a) What force does the car exert on the sled?
b) What is the acceleration of the car and sled?

2. Calculate the acceleration of a skier heading down a 12.3° slope, assuming the coefficient of friction for waxed wood on wet snow. Using published value of coefficient.

Find the angle of the slope down which this skier could coast at a constant velocity. You can neglect air resistance in both parts, and you will find the result of Exercise 5.1 to be useful. Explicitly show how you follow the steps in the Problem-Solving Strategies.

3. Calculate the deceleration of a snow boarder going up a 10.9°, slope assuming the coefficient of friction for waxed wood on wet snow.

4. A nylon string has a diameter of 2.00 mm, and an unstretched length of 34.5 cm.
The string is stretched with a force of 300 N.
What is the new length of the string?

5. A 4.00 meter cord stretches 6.03 mm when pulled with a force of 550 N.
The diameter of the cord is 1.50 cm.
Determine Young’s Modulus (Y) for this cord.

6. A Race car tires are designed to have high values for the coefficient of static friction.
A 900 kg race car starts at rest and travels a distance of 900 meters in 10.55 seconds.
Calculate the minimum value of static friction the car tires would need.
(assume constant acceleration and ignore drag and downforce)

Answer 1