Question: Match the pathogen to the disease it causes.
A. Borrelia burgdorferi
B. Plasmodium falciparum
C. Rickettsia rickettsii
D. Trypanosoma brucei
E. Yersinia pestis

Answer Options:
i. African sleeping sickness
ii. Lyme disease
iii. malaria
iv. plague
v. Rocky Mountain spotted fever

Answer: A. ii, B. iii, C. v, D. i, E. iv

Question: ________ pathogens always cause disease.

Answer: Primary

Question: Which of the following physical quantities can be negative?

Answer Options:
a. kinetic energy
b. potential energy
c. both kinetic and potential energy

Answer: b. potential energy

Question: A pendulum bob has mass of 0.750 kg and is on a pendulum arm of length 1.00 m. The pendulum is pulled back so that the arm makes an angle of 60.0° from the vertical and is then released. Which of the following is the speed of the mass when it reaches its lowest point?

Answer Options:
a. 3.68 m/s
b. 3.13 m/s
c. 4.43 m/s
d. 4.12 m/s

Answer: b. 3.13 m/s

Question: A 0.500 kg steel ball is dropped from a height of 4.00 m onto a horizontal steel slab. The collision appears elastic in that the ball rebounds to its original height. If the collision lasts for 2.00 x 10^-3 s, which of the following is the impulse imparted to the ball and the average force applied to the ball during the collision?

Answer Options:
a. I = 8.49 kg·m/s, F = 4.25 x 10^3 N
b. I = 8.86 kg·m/s, F = 4.43 x 10^3 N
c. I = 8.80 kg·m/s, F = 4.00 x 10^3 N
d. I = 8.86 kg·m/s, F = 2.22 x 10^3 N

Answer: b. I = 8.86 kg·m/s, F = 4.43 x 10^3 N

Question: An empty freight train car of mass 10,000 kg is rolling along a level section of track at 2.00 m/s. It collides with a loaded car of weight 1.96 x 10^5 N, which is at rest. The cars couple upon collision. Which of the following is the speed of the train after the collision?

Answer Options:
a. 1.02 m/s
b. 0.667 m/s
c. 2.00 m/s
d. 3.02 m/s

Answer: b. 0.667 m/s

Question: A car is decelerating from 60 mph to 0 mph in 122 ft. and has 18-in. diameter tires. What is the average angular deceleration of the tires?

Answer Options:
a. -31.7 rad/s^2
b. -42.3 rad/s^2
c. -83.5 ft/s^2
d. -31.7 ft/s^2

Answer: b. -42.3 rad/s^2

Question: A 0.200 kg dart is fired horizontally at a speed of 2.75 m/s when it hits a 0.700 kg block of wood suspended by a string. The nose of the dart sticks into 0.00210 m the wood. Together the dart and block swing upwards from a height of 0.0500 m above a table to 0.128 m above the table. Which of the following is the average force the dart applies to the block during impact?

Answer Options:
a. 32.4 N
b. 15.1 N
c. 1.36 N
d. 0.872 N

Answer: a. 32.4 N

Question: The center of mass is used to determine _______________.

Answer Options:
a. an object’s rotational motion
b. an object’s translational motion
c. an object’s potential energy
d. an object’s kinetic energy

Answer: b. an object’s translational motion

Question: Exhaust gas from a rocket ship is released at a speed of 1,000 m/s so that the craft accelerates from 100 m/s to 200 m/s. How much fuel is necessary to complete this acceleration if the mass of the ship was originally 10,000 kg?

Answer Options:
a. 961.6 kg
b. 481.5 kg
c. 650.0 kg
d. 320.4 kg

Answer: a. 961.6 kg