Directions:

There 20 multiple choice questions. Each question is 5 points, and the exam is 100 points. The exam is open book, open notes. However, you may not discuss the exam with your classmates.

Submit your work for each question in Canvas.

πΎπΈ = 1

2 ππ£2, ππ = ππβ , ππ = 1

2 ππ₯2 , π = πΉπ , πΈ = πΎπΈ + ππ + ππ ,

πΈπ Β± πππ = πΈπ , π = π

π‘ , πΈ = ππ‘ , π = 9.8 π

π ππ2 ,

πβ = π π£β , πΎπΈ = 1

2 ππ£2, π£β1,π β π£β2,π = β(π£β1,π β π£β2,π), π = π£π

π

Ξπ

Ξπ‘ β π

Problems 1-2 refer to the following situation. A ball is released from rest from a height of 3.0 m

above the ground.

Problem 1:

What is the speed of the ball when the ball is 2.0 m above the ground?

a. 1.4 m/sec b. 2.4 m/sec c. 3.4 m/sec d. 4.4 m/sec

Problem 2:

What is the speed of the ball just before the ball hits the ground?

a. 5.7 m/sec b. 6.7 m/sec c. 7.7 m/sec d. 8.7 m/sec

Problems 3-4 refer to the following situation. A computer consumes 0.200 kW of power.

Problem 3:

What how much energy does the computer consume in 30 days if the computer is used 6 hours

each day?

a. 36.0 kWβ
hr b. 46.0 kWβ
hr c. 56.0 kWβ
hr d. 66.0 kWβ
hr

Problem 4:

What is the cost of running this computer if the electricity costs $0.120 per kWβ
hr?

a. $1.32 b. $2.32 c. $3.32 d. $4.32

Problems 5-6 refer to the following situation. A person of mass 60 kg starts from rest. The

person goes up a flight of stairs of height 3.0 m and the person has a speed of 2.0 m/sec when

they reach the top of the stairs.

Problem 5:

What is the work done by the person to reach the top of the stairs?

a. 1884 J b. 2084 J c. 2284 J d. 2484 J

Problem 6:

What is the power output of the person If it took the person 3.50 sec to reach the top of the

stairs?

a. 238.3 W b. 338.3 W c. 438.3 W d. 538.3 W

Problems 7-8 refer to the following situation. A person of mass 90.0 kg starts from rest. The

person runs 200.0 m in 50.0 sec on a level road. The final speed of the person is 4.0 m/sec and a

wind exerts an average force of 3.0 N against the person.

Problem 7:

What is the work done by the person?

a. 1120 J b. 1320 J c. 1520 J d. 1720 J

Problem 8:

What is the power output of the person?

a. 16.4 W b. 26.4 W c. 36.4 W d. 46.4 W

Problems 13-16 refer to the following situation (shown in the figure below). A mass

π1 = 2.3 ππ is moving to the right with an initial speed π£1,π = 1.6 π/π ππ and a mass

π2 = 0.70 ππ is moving to the right with an initial speed π£2,π = 0.60 π/π ππ. π1 and π2 then

collide. After the collision, π2 moves to the right with a speed π£2,π = 1.9 π/π ππ.

Problem 13:

What is the kinetic energy of the two-mass system before the collision?

a. 1.1 J b. 2.1 J c. 3.1 J d. 4.1 J

Problem 14:

What is the speed and direction of π1 after the collision?

a. 1.2 m/sec to

the left

b. 2.2 m/sec to

the left

c. 1.2 m/sec to

the right

d. 2.2 m/sec to

the right

Problem 15:

What is the kinetic energy of the two-mass system after the collision?

a. 1.9 J b. 2.9 J c. 3.9 J d. 4.9 J

Problem 16:

What type of collision did π1 and π2 have?

a. Completely Inelastic b. Inelastic c. Elastic

Problems 17-20 refer to the following situation (shown in the figure below). A mass

π1 = 1.2 ππ is moving to the right with an initial speed π£1,π = 2.6 π/π ππ and a mass

π2 = 1.8 ππ is moving to the right with an initial speed π£2,π = 1.1 π/π ππ. π1 and π2 then

collide. After the collision, π2 moves to the right with a speed π£2,π = 1.7 π/π ππ.

Problem 17:

What is the kinetic energy of the two-mass system before the collision?

a. 5.1 J b. 6.1 J c. 7.1 J d. 8.1 J

Problem 18:

What is the speed and direction of π1 after the collision?

a. 1.2 m/sec to

the left

b. 1.7 m/sec to

the left

c. 1.2 m/sec to

the right

d. 1.7 m/sec to

the right

Problem 19:

What is the kinetic energy of the two-mass system After the collision?

a. 1.3 J b. 2.3 J c. 3.3 J d. 4.3 J

Problem 20:

What type of collision did π1 and π2 have?

a. Completely Inelastic b. Inelastic c. Elastic

# What is the kinetic energy of the two-mass system before the collision?

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