Question

1.)

Two bumper cars collide head-on. Car #1 has a mass (including the driver) of 120 kg, and is heading north at 5 m/s before the collision. Car #2 has a mass (including the driver) of 150 kg, and is heading south at 6 m/s before the collision.


After the collision, Car #1 is heading south at 4 m/s. What is Car #2's velocity after the collision?

		5.2 m/s north
		1.2 m/s north
		6.8 m/s south
		6.8 m/s north
		5.2 m/s south
		1.2 m/s south

2.)

Here's the info again from the previous question:
Two bumper cars collide head-on. Car #1 has a mass (including the driver) of 120 kg, and is heading north at 5 m/s before the collision. Car #2 has a mass (including the driver) of 150 kg, and is heading south at 6 m/s before the collision.

After the collision, Car #1 is heading south at 4 m/s.


Is this collision elastic?

		Yes
		No
		Not enough information to tell

3.)

Earth is spinning around its axis once per day. What is Earth's angular velocity (in radians per second)?

		0.10 rad/s
		1.1×10-5 rad/s
		1 rad/s
		7.3×10-5 rad/s
		6.28 rad/s

4.)

After social distancing is over and you can start going places again, you get in your car (which has a mass of 1500 kg), and drive around in a circle with a radius of 40 meters. You find that you can only go at speeds up to about 16 m/s; if you go any faster than that, the car starts to slide. What is the coefficient of static friction between your tires and the road?

		.75
		.65
		.16
		.4
		6.4

Answer 1