Make an order-of-magnitude estimate of each of the following quantities. Letters in parentheses refer to hints below. Use them as needed to guide your thinking. 1. The inertia of a suitcase filled with physics textbooks (H, L, Q) 2. The ratio of the inertias of an object and a bowling ball if the object, initially at rest on a bowling alley, doesn't move notice- ably after being hit by the bowling ball (C, M, B) 3. The magnitude of the momentum of a tennis ball as it crosses the net (F, R) 4. The magnitude of the momentum of a bowling ball moving toward the pins (A, M) 5. The magnitude of the momentum of a baseball pitched by a major-league pitcher (I, S) 6. The magnitude of the momentum of a typical marathon run- ner (D, O, V) 7. The magnitude of the change in momentum of a baseball bat that reverses the velocity of the baseball of question 5 (G, N) 8. The magnitude of the change in momentum of a stationary bowling ball hit by the tennis ball of question 3 (B, G, N) 9. The magnitude of the change in momentum of a car that leaves the freeway to stop for gas (E, J, T) 10. The magnitude of the change in velocity of a car that hits a stationary deer (E, P, K, U, N)

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Chapter1: Units, Trigonometry. And Vectors
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Developing a Feel
Make an order-of-magnitude estimate of each of the following quantities. Letters in parentheses refer to hints below. Use them as needed to
guide your thinking.
1. The inertia of a suitcase filled with physics textbooks (H, L, Q)
2. The ratio of the inertias of an object and a bowling ball if the
object, initially at rest on a bowling alley, doesn't move notice-
ably after being hit by the bowling ball (C, M, B)
3. The magnitude of the momentum of a tennis ball as it crosses
the net (F, R)
4. The magnitude of the momentum of a bowling ball moving
toward the pins (A, M)
5. The magnitude of the momentum of a baseball pitched by a
major-league pitcher (I, S)
6. The magnitude of the momentum of a typical marathon run-
ner (D, O, V)
7. The magnitude of the change in momentum of a baseball bat
that reverses the velocity of the baseball of question 5 (G, N)
8. The magnitude of the change in momentum of a stationary
bowling ball hit by the tennis ball of question 3 (B, G, N)
9. The magnitude of the change in momentum of a car that
leaves the freeway to stop for gas (E, J, T)
10. The magnitude of the change in velocity of a car that hits a
stationary deer (E, P, K, U, N)
Transcribed Image Text:Developing a Feel Make an order-of-magnitude estimate of each of the following quantities. Letters in parentheses refer to hints below. Use them as needed to guide your thinking. 1. The inertia of a suitcase filled with physics textbooks (H, L, Q) 2. The ratio of the inertias of an object and a bowling ball if the object, initially at rest on a bowling alley, doesn't move notice- ably after being hit by the bowling ball (C, M, B) 3. The magnitude of the momentum of a tennis ball as it crosses the net (F, R) 4. The magnitude of the momentum of a bowling ball moving toward the pins (A, M) 5. The magnitude of the momentum of a baseball pitched by a major-league pitcher (I, S) 6. The magnitude of the momentum of a typical marathon run- ner (D, O, V) 7. The magnitude of the change in momentum of a baseball bat that reverses the velocity of the baseball of question 5 (G, N) 8. The magnitude of the change in momentum of a stationary bowling ball hit by the tennis ball of question 3 (B, G, N) 9. The magnitude of the change in momentum of a car that leaves the freeway to stop for gas (E, J, T) 10. The magnitude of the change in velocity of a car that hits a stationary deer (E, P, K, U, N)
Hints
A. What is the inertia of a bowling ball?
B. How does the object of less inertia behave after a collision with
an object of greater inertia?
C. What is the largest nonzero speed that is too small to be no-
ticed during a few seconds of observation?
D. What is the inertia of a marathon runner?
Q. What is the volume of a single physics book?
R. What is the speed of a tennis serve?
S. What is the speed of a pitched baseball?
T. What is the speed of a car when fueling?
U. With what speed would the deer rebound? (First consider a
moving deer bouncing off a stationary car by analogy to
question 8.)
V. What is the length of a marathon?
E. What is the inertia of a typical car?
F. What is the inertia of a tennis ball?
G. What is the magnitude of the change in momentum of the ob-
ject with less inertia?
H. What is the inertia of a single physics textbook?
I. What is the inertia of a baseball?
J. What is the speed of the car while on the freeway?
K. What is the inertia of a typical deer?
L. What is the volume of a typical suitcase?
M. What is the typical speed of a bowling ball moving toward the objecťs initial momentum; H. 3 kg; I. 0.2 kg; J. 3 × 10' m/s;
Key (all values approximate)
A. 7 kg; B. it bounces back, approximately reversing its velocity;
C. 1 x 10³m/s; D. 6 × 10' kg; E. 2 × 10³ kg; F. 6 × 10² kg;
G. because the motion reverses, about twice the magnitude of the
pins?
N. What do you know about the momentum of this system of two
objects?
O. What time interval is required to run a marathon?
P. What is the likely speed of a car on a road with deer crossings?
K. 5 × 10' kg; L. 0.1 m²; M. 7 m/s; N. it remains approximately
constant; O. 3 h or more; P. less than half freeway speed, perhaps
1 × 10' m/s; Q. 3 × 10³ m²; R. 5 × 10' m/s; S. 4 × 10' m/s;
T. 0; U. at a speed somewhat slower than twice the initial speed of
the car; V. 4 X 10' km
Transcribed Image Text:Hints A. What is the inertia of a bowling ball? B. How does the object of less inertia behave after a collision with an object of greater inertia? C. What is the largest nonzero speed that is too small to be no- ticed during a few seconds of observation? D. What is the inertia of a marathon runner? Q. What is the volume of a single physics book? R. What is the speed of a tennis serve? S. What is the speed of a pitched baseball? T. What is the speed of a car when fueling? U. With what speed would the deer rebound? (First consider a moving deer bouncing off a stationary car by analogy to question 8.) V. What is the length of a marathon? E. What is the inertia of a typical car? F. What is the inertia of a tennis ball? G. What is the magnitude of the change in momentum of the ob- ject with less inertia? H. What is the inertia of a single physics textbook? I. What is the inertia of a baseball? J. What is the speed of the car while on the freeway? K. What is the inertia of a typical deer? L. What is the volume of a typical suitcase? M. What is the typical speed of a bowling ball moving toward the objecťs initial momentum; H. 3 kg; I. 0.2 kg; J. 3 × 10' m/s; Key (all values approximate) A. 7 kg; B. it bounces back, approximately reversing its velocity; C. 1 x 10³m/s; D. 6 × 10' kg; E. 2 × 10³ kg; F. 6 × 10² kg; G. because the motion reverses, about twice the magnitude of the pins? N. What do you know about the momentum of this system of two objects? O. What time interval is required to run a marathon? P. What is the likely speed of a car on a road with deer crossings? K. 5 × 10' kg; L. 0.1 m²; M. 7 m/s; N. it remains approximately constant; O. 3 h or more; P. less than half freeway speed, perhaps 1 × 10' m/s; Q. 3 × 10³ m²; R. 5 × 10' m/s; S. 4 × 10' m/s; T. 0; U. at a speed somewhat slower than twice the initial speed of the car; V. 4 X 10' km
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