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Answered: - Sample Exam 1 Phys 111 _______________ 1. Vx is the velocity of


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Sample Exam 1

 


 

Phys 111 _______________

 


 

1. Vx is the velocity of a particle moving along the x axis as shown. If x = 2.0 m at t = 1.0 s, what is the position of the particle at t =

 

6.0 s?

 


 

a.

 

b.

 

c.

 

d.

 

e.

 


 

?2.0 m

 

+2.0 m

 

+1.0 m

 

?1.0 m

 

6.0 m

 


 

2. A particle moving along the x axis has a position given by x = (24t ? 2.0t3) m, where t is measured in s. What is the magnitude of the

 

acceleration of the particle at the instant when its velocity is zero?

 

a.

 

b.

 

c.

 

d.

 

e.

 


 

24 m/s2

 

zero

 

12 m/s2

 

48 m/s2

 

36 m/s2

 


 

3. An automobile traveling along a straight road increases its speed from 30.0 m/s to 50.0 m/s in a distance of 180 m. If the

 

acceleration is constant, how much time elapses while the auto moves this distance?

 

a.

 

b.

 

c.

 

d.

 

e.

 


 

6.00 s

 

4.50 s

 

3.60 s

 

4.00 s

 

9.00 s

 


 

4. John throws a rock straight down with speed 12 m/s from the top of a tower. The rock hits the ground after 2.37 s. What is the

 

height of the tower? (air resistance is negligible)

 

a. 4.8 m

 

b. 19.6 m

 

c. 27.5 m

 

d. 38.4 m

 

e. 56.0 m

 


 

5. Two vectors

 

and

 

are given by

 

and

 

starting at the same point, what is the angle between them?

 

a. 106?

 

b. 102?

 

c. 110?

 

d. 113?

 

e. 97?

 


 

. If these two vectors are drawn

 


 

6. Vectors

 


 

a.

 

b.

 

c.

 

d.

 

e.

 


 

and

 


 

are shown. What is the magnitude of a vector

 


 

if

 


 

?

 


 

46

 

10

 

30

 

78

 

90

 


 

7. The three forces shown act on a particle. What is the direction of the particle?s acceleration

 


 

a.

 

b.

 

c.

 

d.

 

e.

 


 

35?

 

45?

 

65?

 

55?

 

85?

 


 

8. Two vectors

 

and

 

are given by

 

and

 

starting at the same point, what is the angle between them?

 

a. 106?

 

b. 102?

 

c. 110?

 

d. 113?

 

e. 97?

 


 

. If these two vectors are drawn

 


 

9. At t = 0, a particle leaves the origin with a velocity of 12 m/s in the positive x direction and moves in the xy plane with a constant

 

acceleration of

 

a.

 

b.

 

c.

 

d.

 

e.

 


 

. At the instant the y coordinate of the particle is 18 m, what is the x coordinate of the particle?

 


 

30 m

 

21 m

 

27 m

 

24 m

 

45 m

 


 

10. In 2.0 s, a particle moving with constant acceleration along the x axis goes from x = 10 m to x = 50 m. The velocity at the end of

 

this time interval is 10 m/s. What is the acceleration of the particle?

 

a. +15 m/s2

 

b. +20 m/s2

 

c. ?20 m/s2

 

d. ?10 m/s2

 

e. ?15 m/s2

 


 

11. A ball is thrown horizontally from the top of a building 0.10 km high. The ball strikes the ground at a point 65 m horizontally

 

away from and below the point of release. What is the speed of the ball just before it strikes the ground?

 

a.

 

b.

 

c.

 

d.

 

e.

 


 

43 m/s

 

47 m/s

 

39 m/s

 

36 m/s

 

14 m/s

 


 

12. A bird, accelerating from rest at a constant rate, experiences a displacement of 28 m in 17 s. What is the final velocity after 11 s?

 

a. 0.19 m/s

 

b. 1.6 m/s

 

c. 3.3 m/s

 

d. 2.1 m/s

 

e. 5.1 m/s

 


 

13 A ball is thrown at an angle of ? = 30 deg from the top of a building 0.10 km high. If the magnitude of ball?s initital velocity is 20

 

m/s, how long is the ball in air?

 

a.

 

b.

 

c.

 

d.

 

e.

 


 

1.2 s

 

4.8 s

 

5.7 s

 

12.6 s

 

18.0 s

 


 

14. The initial speed of a cannon ball is 200 m/s. If the ball is to strike a target that is at a horizontal distance of 3.0 km

 

from the cannon, what is the minimum time of flight for the ball?

 

a.

 

b.

 

c.

 

d.

 

e.

 


 

16 s

 

21 s

 

24 s

 

14 s

 

19 s

 


 

15 A 3.00-kg mass undergoes an acceleration given by a = (2i+5j ) m/s2. The magnitude of the net force is

 

a. 2.0 N

 

b. 4.0 N

 

c. 6.0 N

 

d. 12.0 N

 

e. 16.0 N

 


 

16. A 10-kg block on a horizontal plane is connected by a cord over a massless, frictionless pulley to a second block of mass m. What

 

hanging mass m is needed so that the 10-kg block can move at acceleration of 2.8 m/s2 ?

 

a.

 

b.

 

c.

 

d.

 

e.

 


 

1 kg

 

2 kg

 

3 kg

 

4 kg

 

5 kg

 


 

17.

 

The horizontal surface on which the block slides is frictionless. If F = 20 N and M = 5.0 kg, what is the magnitude of the

 

resulting acceleration of the block?

 


 

a.

 

b.

 

c.

 

d.

 

e.

 


 

18.

 


 

5.3 m/s2

 

6.2 m/s2

 

7.5 m/s2

 

4.7 m/s2

 

3.2 m/s2

 


 

At an instant when a 4.0-kg object has an acceleration equal to

 


 

known to be

 

a. 2.0 N

 

b. 13 N

 

c. 18 N

 

d. 1.7 N

 

e. 20 N

 


 

m/s2, one of the two forces acting on the object is

 


 

N. Determine the magnitude of the other force acting on the object.

 


 

19.

 

The tension in a string from which a 4.0-kg object is suspended in an elevator is equal to 28 N. What is the acceleration of the

 

elevator?

 

a. 11 m/s2 upward

 

b. 1.2 m/s2 upward

 

c. 1.2 m/s2 downward

 

d. 10 m/s2 upward

 

e. 2.8 m/s2 downward

 


 

 


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