Practice test – Chapters 1-4 – PHY1033C

 

Your test will have 20 or 25 questions.  Some will be multiple choice, and some will be short answer.  The questions below are representative of what you will see (but of course will be different)

 

1. A child is on a flatcar moving due east at 8 m/s.  He rolls a ball at a speed of 6 m/s due north relative to the flatcar.  Make a sketch that shows the speed of the ball relative to the ground.  Estimate this speed.

 

2. A ball is tossed upward at a starting velocity of 15 m/s.  Assuming the acceleration of gravity is g = 10 m/s2, the ball will reach a maximum height of ___m.

 

(1) 11.3     (2) 15.0      (3) 18.5      (4) 20.8      (5) 24.5

 

3. A graph of velocity for a certain object as a function of time is shown below.  The acceleration for this object is ___ m/s2.

 

(1) 4/3    (2) 3/4    (3) -4/3     (4) -3/4     (5) none of these

 

 

4.  A 12-N force is applied to a 4-kg mass on a frictionless surface, as shown.  At t = 3 s the acceleration of the mass is ___ m/s2.    

 

(1) 1        (2) 2        (3) 3         (4) 4         (5) 6

 

 

5.  Three seconds after a rock is dropped it hits the ground.  The speed of the rock just before impact is ___ m/s.  Assume g = 10 m/s2, and neglect air resistance.

 

(1) 15        (2) 20        (3) 25        (4) 30         (5) 40

 

6. The rock in the above problem must have been dropped from a height of ___ meters.

 

(1) 20        (2) 25        (3) 30        (4) 40          (5) 45

 

7.  A force F = 12 N parallel to a frictionless horizontal surface accelerates two masses connected by a cord, as shown.  The tension in the connecting cord is ___ N.

 

(1) 3.0       (2) 3.6       (3) 4.0       (4) 4.5       (5) 6.0

 

 

8. A cart rolls down a frictionless ramp starting from rest.  Between t = 0 and t = 1 s, the cart moves 1 m.  Therefore, between t = 1 and t = 2 s, the cart moves ____ m.

(1) 1     (2) 2      (3) 3      (4)     (5)

 

9. A falling skydiver of mass 100 kg experiences 500 N of air resistance.  The acceleration of the skydiver is

 

(1) 0.2 g   (2) 0.3 g   (3) 0.4 g   (4) 0.5 g   (5) more than 0.5 g

10. A feather and a coin will have equal accelerations when falling in a vacuum because

 

(1) their velocities are the same  

(2) the force of gravity is the same for each in a vacuum

(3) the force of gravity does not act in a vacuum 

(4) The ratio of each object’s weight to its mass is the same

(5) none of these

 

11. A skydiver jumps from a plane.  As her velocity increases her acceleration

 

(1) increases   (2) decreases   (3) remains the same

 

12. According to the special theory of relativity, all laws of nature are the same in reference frames that

 

(1) undergo constant acceleration   (2) move in constant circles   (3) move at constant velocity

(4) all of these   (5) none of these

 

13. A spaceship moving at a velocity of v = 0.8 c relative to an observer on earth fires a missile backwards at a velocity of 0.5 c relative to the spaceship.  What is the velocity of the missile as seen by the earth observer according to classical physics?  What is the velocity of the missile as seen by the earth observer according to special relativity?