PHYS 2325 Exam 2 Review (HW)

If you set the cruise control of your car to a certain speed and take a turn, the speed of the car will remain the same. Is the car accelerating?

• Yes

• No

• Maybe

• Don't Know

Two-dimensional motion: Shown below are the velocity and acceleration vectors for a person in several different types of motion. In which case is the person slowing down and turning to his right?

• A

• B

• C

• D

• E

Two-dimensional motion: An object has a position given by r = [2.00 m + ( 5.00 m/s)t] i + [3.00 m - ( 2.00 m/s²)t²] j, where quantities are in SI units. What is the speed of the object at time t = 2.00 s?

• 13.43m/s

• 10.11m/s

• 9.43m/s

• 20.87m/s

A box slides down a frictionless plane inclined at an angle θ above the horizontal. The gravitational force on the box is directed

• horizontally

• at an angle θ

• downwards

• vertically

Two objects have masses m and 5m, respectively. They both are placed side by side on a frictionless inclined plane and allowed to slide down from rest.

• The m mass reaches first

• The 5m block reaches first

• The two objects reach the bottom of the incline at the same time.

• Neither object reaches first

A box of mass m is pulled with a constant acceleration a along a horizontal frictionless floor by a wire that makes an angle of 15° above the horizontal. If T is the tension in

• T>ma

• T<ma

• T=ma

• T>=ma

On its own, a certain tow-truck has a maximum acceleration of 3.0 m/s².  What would be the maximum acceleration when this truck was towing a bus of twice its own mass?

• 9.8m/s^2

• 5.4m/s^2

• 1.0m/s^2

• 6.7m/s^2

A 60.0-kg person rides in an elevator while standing on a scale.  The scale reads 400 N.  The acceleration of the elevator is closest to

• 3.13m/s^2 upwards

• 3.13m/s^2 downward

• 4.67m/s^2 upward

• 4.67m/s^2 downward

A 60.0-kg person rides in elevator while standing on a scale.  The elevator is traveling downward but slowing down at a rate of 2.00 m/s².  The reading on the scale is closest to

• 150N

• 600N

• 700N

• 708N

The figure shows a graph of the acceleration of an object as a function of the net force acting on it. The mass of this object, in grams, is closest to

• 80

• 100

• 130

• 200