Questions 150 151
During a recent winter storm, bales of hay had to be dropped from an airplane to a herd of cattle below. Assume
the airplane flew horizontally at an altitude of 180 m with a constant velocity of 50 m/s and dropped one bale of
hay every t
General Physics for Biological Sciences Majors
171.103 Midterm examination # 1
September 27, 2011
The exam lasts 50 minutes. Each problem is worth 25 points. No books are allowed. You
may use a 3 5 inch single-sided index card that should be submitted alo
Summary of week twelve lectures
The photoelectric eect showed that light is made of particles called photons. The
energy of a photon is E = hf where f is the frequency of the light and h is Plancks
constant.
Light exhibits both wave-like properties and
Practice examination 1
1. The current is zero at 2 and 4; counterclockwise at 1 and 5; clockwise and
double in magnitude at 3.
2. (a) The inductor opposes a sudden change in current and breaks the circuit,
hence the current only ows through resistor 1.
(b
*39. An object is thrown with velocity v from the edge of a cliff above level ground. Neglect air resistance. In order
for the object to travel a maximum horizontal distance from the cliff before hitting the ground, the throw should
be at an angle with re
15. A rock of mass m is thrown horizontally off a building from a height h, as shown above. The speed of the rock
as it leaves the throwers hand at the edge of the building is v 0. How much time does it take the rock to travel
from the edge of the buildin
25. Vectors V 1 and V 2 shown above have equal magnitudes. The vectors represent the velocities of an object at
times t 1 , and t 2 , respectively. The average acceleration of the object between time t 1 and t 2 was
(A) zero (B) directed north (C) directe
1.
A car travels 30 miles at an average speed of 60 miles per hour and then 30 miles at an average speed of 30
miles per hour. The average speed the car over the 60 miles is
(A) 35 m.p.h. (B) 40 m.p.h. (C) 45 m.p.h. (D) 10 m.p.h. (E) 53 m.p.h.
Questions 2
*136.During an interval of time, a tennis ball is moved so that the angle between the velocity and the acceleration of
the ball is kept at a constant 120. Which statement is true about the tennis ball during this interval of time?
(A) Its speed increases
Questions 114 116
The accompanying graph describes the motion of a marble on a table top for 10 seconds.
114. For which time interval(s) did the marble have a negative velocity?
(A) from t = 8.0 s to t = 10.0 s only (B) from t = 6.9 s to t = 10.0 s only
(
127. A pebble is dropped from a high vertical cliff. The collision of the pebble with the ground below is seen 1.50
seconds after the pebble is dropped. With what speed did the pebble hit the ground? Ignore air resistance. (A)
10 m/s
(B) 15 m/s (C) 48.6 m
47. A whiffle ball is tossed straight up, reaches a highest point, and falls back down. Air resistance is not negligible.
Which of the following statements are true?
I. The balls speed is zero at the highest point.
II. The balls acceleration is zero at th
85. When a falling object reaches terminal velocity, it
(A) is no longer subject to the friction of air (B) moves downward with constant velocity.
(C) has an acceleration of approximately 10 m/s2 (D) has no downward velocity.
(E) has an upward acceleratio
100. If car #3 continues to constantly accelerate at the same rate what will be its position at the end of 6 seconds?
(A) 22 m (B) 68 m (C) 72 m (D) 78 m (E) 94 m
19
Questions 101 102
101. The graph represents the relationship between distance and time fo
56. A bird is flying in a straight line initially at 10 m/s. It uniformly increases its speed to 15 m/s while covering a
distance of 25 m. What is the magnitude of the acceleration of the bird?
(A) 5.0 m/s2
(B) 2.5 m/s2 (C) 2.0 m/s2
(D) 0.5 m/s2
(E) 0.2 m
*72. A baseball is thrown vertically into the air with a velocity v, and reaches a maximum height h. At what height
was the baseball moving with one-half its original velocity? Assume air resistance is negligible.
(A) 0.25 h (B) 0.33 h (C) 0.50 h (D) 0.67
65. The graph shows velocity as a function of time for a car. What was the acceleration at time t = 90 seconds?
(A) 0.22 m/s2
(B) 0.33 m/s2
(C) 1.0 m/s2
(D) 9.8 m/s2
(E) 30 m/s2
66. An object is released from rest and falls a distance h during the first s
Practice examination 1
1. The current is zero at 2 and 4; counterclockwise at 1 and 5; clockwise and
double in magnitude at 3.
2. (a) The inductor opposes a sudden change in current and breaks the circuit,
hence the current only ows through resistor 1.
(b