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
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
Solution Summary: The author explains that "D" is unable to hold the bill as the vertical distance travelled by it in the reaction time is much more than the half length of it.
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.
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.
Emily 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 P2.67
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
University Physics with Modern Physics (14th Edition)
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