Physics for Scientists and Engineers
10th Edition
ISBN: 9781337553278
Author: Raymond A. Serway, John W. Jewett
Publisher: Cengage Learning
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Chapter 2, Problem 25P
Why is the following situation impossible? Emily challenges David to catch a $1 bill as follows. She holds the bill vertically as shown in Figure P2.25, with the center of the bill between but not touching David’s index finger and thumb. Without warning, Emily releases the bill. David catches the bill without moving his hand downward. David’s reaction time is equal to the average human reaction time.
Figure P2.25
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Why is the following situation possible?
Emily challenges her friend David to catch a $1 bill as follows. She holds the bill vertically as shown in figure P2.29 with the center of the bill between but not touching David's index finger and thumb. Without warning, Emily releases the bill. David catches the bill without moving his hands downwards. David reaction time is equal to the average human reaction time.
Avg human reaction time is .2s.
Dollar bill is approx 15.5cm in length.
I need help explaining this. Thank you.
Question 1: Emily challenges her husband, David, to catch a $1 bill as follows. She holds the bill vertically, with the center of the bill between David's index finger and thumb. David must catch the bill after Emily releases it without moving his hand downward. If his reaction time is 0.2 s, will he succeed?
Yes or No
Explain your reasoning.
Question 2: In Bosnia, the ultimate test of a young man's courage used to be to jump off a 400-year-old bridge (destroyed in 1993; rebuilt in 2004) into the River Neretva, 23 m below the bridge.
(a) How long did the jump last? ___________s(b) How fast was the jumper traveling upon impact with the river? _____________m/s(c) If the speed of sound in air is 340 m/s, how long after the jumper took off did a spectator on the bridge hear the splash?
__________________s
Emily challenges her husband, David, to catch a $1 bill as follows. She holds the bill vertically as in Figure P2.69, with the center of the bill between David’s index finger and thumb. David must catch the bill after Emily releases it without moving his hand downward. If his reaction time is 0.2 s, will he succeed? Explain your reasoning. (This challenge is a good trick you might want to try with your friends.)
Chapter 2 Solutions
Physics for Scientists and Engineers
Ch. 2.1 - Which of the following choices best describes what...Ch. 2.2 - Are officers in the highway patrol more interested...Ch. 2.5 - Make a velocitytime graph for the car in Figure...Ch. 2.5 - If a car is traveling eastward and slowing down,...Ch. 2.6 - Which one of the following statements is true? (a)...Ch. 2.7 - In Figure 2.12, match each vxt graph on the top...Ch. 2.8 - Consider the following choices: (a) increases, (b)...Ch. 2 - The speed of a nerve impulse in the human body is...Ch. 2 - A particle moves according to the equation x =...Ch. 2 - The position of a pinewood derby car was observed...
Ch. 2 - An athlete leaves one end of a pool of length L at...Ch. 2 - A positiontime graph for a particle moving along...Ch. 2 - A car travels along a straight line at a constant...Ch. 2 - A person takes a trip, driving with a constant...Ch. 2 - A child rolls a marble on a bent track that is 100...Ch. 2 - Figure P2.9 shows a graph of vx versus t for the...Ch. 2 - (a) Use the data in Problem 3 to construct a...Ch. 2 - A particle starts from rest and accelerates as...Ch. 2 - Draw motion diagrams for (a) an object moving to...Ch. 2 - Each of the strobe photographs (a), (b), and (c)...Ch. 2 - An electron in a cathode-ray tube accelerates...Ch. 2 - A parcel of air moving in a straight tube with a...Ch. 2 - In Example 2.7, we investigated a jet landing on...Ch. 2 - An object moving with uniform acceleration has a...Ch. 2 - Solve Example 2.8 by a graphical method. On the...Ch. 2 - A glider of length moves through a stationary...Ch. 2 - Why is the following situation impossible?...Ch. 2 - A glider of length 12.4 cm moves on an air track...Ch. 2 - In the particle under constant acceleration model,...Ch. 2 - At t = 0, one toy car is set rolling on a straight...Ch. 2 - You are observing the poles along the side of the...Ch. 2 - Why is the following situation impossible? Emily...Ch. 2 - An attacker at the base of a castle wall 3.65 m...Ch. 2 - The height of a helicopter above the ground is...Ch. 2 - A ball is thrown upward from the ground with an...Ch. 2 - A student throws a set of keys vertically upward...Ch. 2 - At time t = 0, a student throws a set of keys...Ch. 2 - You have been hired by the prosecuting attorney as...Ch. 2 - A student drives a moped along a straight road as...Ch. 2 - Automotive engineers refer to the time rate of...Ch. 2 - In Figure 2.11b, the area under the velocitytime...Ch. 2 - The froghopper Philaenus spumarius is supposedly...Ch. 2 - A woman is reported to have fallen 144 ft from the...Ch. 2 - At t = 0, one athlete in a race running on a long,...Ch. 2 - Why is the following situation impossible? A...Ch. 2 - Hannah tests her new sports car by racing with...Ch. 2 - Two objects, A and B, are connected by hinges to a...Ch. 2 - Lisa rushes down onto a subway platform to find...Ch. 2 - Two thin rods are fastened to the inside of a...Ch. 2 - In a womens 100-m race, accelerating uniformly,...
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- Bob proposed Alice to a marriage on the very top of a 30m building. Alice said yes. Bob then put the ring on Alice’s finger. Alice was very happy. She threw her hands up in the air. Unfortunately, the ring slipped from her finger and fell down due to gravity.Bob set up a camera to record the moment. Thus, he look at the footage and determine that the ring was going out of Alice’s hand with speed of vi =10m/s at an angle of θ=30 . The dimension of the building is given below. (a) If the ring were to land on the terrace, how long would it take?(b) If the ring were to land on the Lawn, how long would it take?(c) Where should Bob search for the ring? Terrace or lawn? An answer with no support reasoning will recieve no credit.arrow_forwardEmily challenges her husband, David, to catch a $1 bill as follows. She holds the bill vertically as in Figure P2.67, with the center of the bill between David's index finger and thumb. David must catch the bill after Emily releases it without moving his hand downward. If his reaction time is 0.2 s, will he succeed? Explain your reasoning. (This challenge is a good trick you might want to try with your friends.) Figure P2.67arrow_forwardHere’s an interesting challenge you can give to a friend. Hold a $1 (or larger!) bill by an upper corner. Have a friend prepare to pinch a lower corner, putting her fingers near but not touching the bill. Tell her to try to catch the bill when you drop it by simply closing her fingers. This seems like it should be easy, but it’s not. After she sees that you have released the bill, it will take her about 0.25 s to react and close her fingers—which is not fast enough to catch the bill. How much time does it take for the bill to fall beyond her grasp? The length of a bill is 16 cm.arrow_forward
- Your car is parked at the high school. After school you take off and travel for 27 km towards lowaCity. At this point, you realize you forget your wallet and travel back to Tipton for 15 km beforeyou find your wallet was just on the floor. You turn back and head towards lowa city for 36 km.What is your displacement?arrow_forwardUarrow_forwardEmily challenges her husband, David, to catch a $1 bill as follows. She holds the bill vertically, with the center of the bill between David's index finger and thumb. David must catch the bill after Emily releases it without moving his hand downward. If his reaction time is 0.2 s, will he succeed? Explain your reasoning.arrow_forward
- Two people each kick identical balls at the same angle. Person A kicks it at three times the speed of person B. How many times higher does A's ball go than B's? 0 3 O 0.33 O 4arrow_forward1.b.In Example 2.12, two circus performers rehearse a trick in which a ball and a dart collide. Horatio stands on a platform 7.8 m above the ground and drops a ball straight down. At the same moment, Amelia uses a spring-loaded device on the ground to launch a dart straight up toward the ball. The dart is launched at 16.0 m/s. Find the time and height of the collision by simultaneously solving the equations for the ball and the dart. (Due to the nature of this problem, do not use rounded intermediate values in your calculations—including answers submitted in WebAssign.)arrow_forwardMy sable-colored Siberian husky, Samba, loves to run after huge objects (for instance, tree branches). I decide to chunk a 6 foot long stick for her to run after and bring back to me. I throw the stick at 2.42 ft/s in 1.5 s. In feet and to two decimal places, how far away did the stick landarrow_forward
- 35. A person going for a walk follows the path shown in T Figure P3.35. The total trip consists of four straight-line paths. At the end of the walk, what is the person's resultant displacement measured from the starting point? Start 100 m 300 m End 200 m 30.0 150 m 60.0° Figure P3.35arrow_forwardConsider the case of a student wishing to investigate the acceleration of a small cart in a lab exercise. The students makes the following measurements of the cart's velocity at the specified times. The equation that relates velocity, acceleration, and time is given by: v=v0 +at. The measurements of velocity and time are: Time 0.40 sec 1.00 sec 1.85 sec 2.51 sec 3.05 sec 3.92 sec Velocity 14.29 cm/s 15.87cm/s 18.13cm/s 21.04cm/s 21.35cm/s 24.42cm/s Plot velocity versus time. Determine the best fit line and the y-intercept. Use these findings from the graph and Equation 17 to determine the initial velocity, v0, and the acceleration, a. v0 = __________________ a = ___________________arrow_forwardYour car is parked at the high school. After school you take off and travel for 27 km towards lowa City. At this point, you realize you forget your wallet and travel back to Tipton for 15 km before you find your wallet was just on the floor. You turn back and head towards low city for 36 km. What is your displacement?arrow_forward
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