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Phys 2420 Exam 1 Review

Total questions: 17

Worksheet time: 24mins

Name
Class
Date
1.

Fred is driving his Volkswagen Beetle at a steady 20m/s when he passes Betty sitting at rest in her Porsche. Betty instantly begins accelerating at 5.0m/s2. How far does Betty have to drive to overtake Fred?

a)

120 m

b)

200 m

c)

160 m

d)

90 m

2.

A particle starts from x0=10m and t0=0s and moves like so: Does the particle have a turning point?

a)

No, there is not a turning point

b)

Yes, at t=1s

c)

Yes, at t=2 s

d)

Yes, at t=3s

3.

A particles starts from x0=10m and t0=0s and moves like so: What is the object’s position at t=2s?

a)

0 m

b)

4 m

c)

8 m

d)

10 m

4.

A sprinter can accelerate with constant acceleration for 4.0s before reaching top speed. He can run the 100-meter dash in 10.0s. What is his speed as he crosses the finish line?

a)

12.5 m/s

b)

14.6 m/s

c)

16.7 m/s

d)

20.4 m/s

5.

Four forces are exerted on the object shown. The net force is Fnet= F1+F2+F3+F4= 4î N. What is F3?

a)

6î+4.95j

b)

0î+2.95j

c)

2î-2.4j

d)

-6.32+1.9j

6.

Four forces are exerted on the object shown. The net force is Fnet=F1+F2+F3+F4=4î. What is F4?

a)

2.36î-3.36j

b)

4.42î+0j

c)

0î-4.42j

d)

-1.64î+0j

7.

A stunt man drives a car off a 10m high cliff at a speed of 20.0m/s. How far does the car land from the base of the cliff?

a)

28.6 m

b)

32.2 m

c)

19.5 m

d)

52.9 m

8.

Which figure shows 2A-B?

a)

A

b)

B

c)

C

d)

D

e)

E

9.

A gray kangaroo can bound across level ground with each jump carrying it 10 m from the takeoff point. Typically the kangaroo leaves the ground at a 20o. If this is so, what is its takeoff speed?

a)

6 m/s

b)

24 m/s

c)

12 m/s

d)

20 m/s

10.

A gray kangaroo can bound across level ground with each jump carrying it 10 m from the takeoff point. Typically the kangaroo leaves the ground at a 20o angle. If this is so, what is its maximum height above ground?

a)

2.0 m

b)

1.5 m

c)

0.9 m

d)

0.6 m

11.

A physics student on Planet Exidor throws a ball, and it follows the parabolic trajectory shown. The ball's position is shown at 1s intervals until t=3s. At t=1s, the ball's velocity is v=(2î+2j)m/s. Determine the ball's velocity at t=0s.

a)

(2î+2j)m/s

b)

(2î+4j)m/s

c)

(2î+0j)m/s

d)

(2î-2j)m/s

12.

A physics student on Planet Exidor throws a ball, and it follows the parabolic trajectory shown. The ball's position is shown at 1s intervals until t=3s. At t=1s, the ball's velocity is v=(2î+2j)m/s. What was the ball's launch angle?

a)

26o

b)

45o

c)

54o

d)

63o

13.

A rifle is aimed horizontally at a target 50 m away. the bullet hits the target 2.0 cm below the aim point. What was the bullet's flight time?

a)

0.021 s

b)

0.035 s

c)

0.064 s

d)

0.072 s

14.

A rifle is aimed horizontally at a target 50 m away. the bullet hits the target 2.0 cm below the aim point. What was the bullet's speed as it left the barrel?

a)

550 m/s

b)

620 m/s

c)

720 m/s

d)

780 m/s

15.

A ceiling fan spinning at 60 rpm coasts to a stop 25s after being turned off. How many revolutions does it make while stopping?

a)

8 rev

b)

13 rev

c)

16 rev

d)

23 rev

16.

A projectile is launched with speed v0 and angle θ. Derive an expression for the projectile's maximum height h.

a)

h= -(v02cos2θ)/2g

b)

h= (v02cos2θ)/2g

c)

h= (v02sin2θ )/2g

d)

h= -(vo2sin2θ )/2g

17.

A projectile is launched with speed v0 and angle θ. Using the equation derived for height h, a baseball is hit with a speed of 33.6m/s. Calculate its height if the baseball is hit at an angle of 30o.

a)

23.2 m

b)

45.6 m

c)

14.4 m

d)

19.5 m