College Physics, Volume 1
2nd Edition
ISBN: 9781133710271
Author: Giordano
Publisher: Cengage
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Chapter 2, Problem 26P
To determine
Graphical estimate of velocity as a function of time.
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A small block has constant acceleration as it slides down a frictionless incline. The block is released from rest at the top of the incline, and its speed after it has traveled 6.00 mm to the bottom of the incline is 3.80 m/sm/s.
A).
What is the speed of the block when it is 4.60 mm from the top of the incline?
Express your answer with the appropriate units.
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
Chapter 2 Solutions
College Physics, Volume 1
Ch. 2.1 - Prob. 2.1CCCh. 2.2 - Prob. 2.2CCCh. 2.2 - For which of the positiontime graphs in Figure...Ch. 2.2 - Figure 2.22A shows the positiontime graph for an...Ch. 2.4 - Prob. 2.6CCCh. 2 - Prob. 1QCh. 2 - Prob. 2QCh. 2 - Prob. 3QCh. 2 - Prob. 4QCh. 2 - Prob. 5Q
Ch. 2 - Prob. 6QCh. 2 - Prob. 7QCh. 2 - Prob. 8QCh. 2 - Prob. 9QCh. 2 - Prob. 10QCh. 2 - Prob. 11QCh. 2 - Prob. 12QCh. 2 - Prob. 13QCh. 2 - Prob. 14QCh. 2 - Prob. 15QCh. 2 - Prob. 16QCh. 2 - Prob. 17QCh. 2 - Prob. 18QCh. 2 - Prob. 19QCh. 2 - Three blocks rest on a table as shown in Figure...Ch. 2 - Two football players start running at opposite...Ch. 2 - Prob. 22QCh. 2 - In SI units, velocity is measured in units of...Ch. 2 - Prob. 2PCh. 2 - Prob. 3PCh. 2 - Prob. 4PCh. 2 - Prob. 5PCh. 2 - Prob. 6PCh. 2 - Prob. 7PCh. 2 - Prob. 8PCh. 2 - Consider a marble falling through a very thick...Ch. 2 - Prob. 10PCh. 2 - Prob. 11PCh. 2 - Prob. 12PCh. 2 - Figure P2.13 shows three motion diagrams, where...Ch. 2 - Prob. 14PCh. 2 - Figure P2.15 shows several hypothetical...Ch. 2 - Prob. 16PCh. 2 - Figure P2.17 shows several hypothetical...Ch. 2 - Prob. 18PCh. 2 - Prob. 19PCh. 2 - Prob. 20PCh. 2 - Prob. 21PCh. 2 - Prob. 22PCh. 2 - Prob. 23PCh. 2 - Prob. 24PCh. 2 - For the object described by Figure P2.24, estimate...Ch. 2 - Prob. 26PCh. 2 - Prob. 27PCh. 2 - Prob. 28PCh. 2 - Prob. 29PCh. 2 - Prob. 30PCh. 2 - Prob. 31PCh. 2 - Prob. 32PCh. 2 - Prob. 33PCh. 2 - Prob. 34PCh. 2 - Prob. 35PCh. 2 - Prob. 36PCh. 2 - Prob. 37PCh. 2 - Prob. 38PCh. 2 - Prob. 39PCh. 2 - Prob. 40PCh. 2 - Prob. 41PCh. 2 - Prob. 42PCh. 2 - Prob. 43PCh. 2 - Prob. 44PCh. 2 - Prob. 45PCh. 2 - Prob. 46PCh. 2 - Prob. 47PCh. 2 - Prob. 48PCh. 2 - Prob. 49PCh. 2 - Prob. 50PCh. 2 - Prob. 51PCh. 2 - Prob. 52PCh. 2 - Prob. 53PCh. 2 - Prob. 54PCh. 2 - Prob. 55PCh. 2 - Prob. 56PCh. 2 - Prob. 57PCh. 2 - Prob. 58PCh. 2 - Prob. 59PCh. 2 - Prob. 60P
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- A student drives a moped along a straight road as described by the velocity–time graph in Figure P2.58. Sketch this graph in the middle of a sheet of graph paper. (a) Directly above your graph, sketch a graph of the position versus time, aligning the time coordinates of the two graphs. (b) Sketch a graph of the acceleration versus time directly below the velocity–time graph, again aligning the time coordinates. On each graph, show the numerical values of x and ax for all points of inflection. (c) What is the acceleration at t = 6.00 s? (d) Find the position (relative to the starting point) at t = 6.00 s. (e) What is the moped’s final position at t = 9.00 s?arrow_forwardA test car travels in a straight line along the x-axis. The graph in Fig. E2.11 shows the car’s position x as a function of time. Find its instantaneous velocity at points A through Garrow_forwardA bus bound to San Carlos City is moving up a steep hill in DSB at 30m/s when suddenly the engine stopped. The driver hits the brakes, but they don't work either. The bus starts to accelerate at -3m/s2. How far does it move forward before it starts sliding back down the hill?arrow_forward
- An object is moving with constant non-zero velocity in the +x direction. The velocity versus time graph of this object is a horizontal straight line. b vertical straight line. c parabolic curve. d straight line making an angle with the time axis.arrow_forwardA particle moves along the x axis beginning at x = −2 m at time zero. The particle moves forward at speed 4 m/s for 3 seconds, then backward at 3 m/s for 2 seconds, then forward again at 1 m/s for 3 seconds. Draw a position vs. time graph for this motion. Draw a velocity vs. time graph for the same motion.arrow_forwardA jet plane lands with a speed of 145 m/s and can accelerate at a maximum rate of -7.00 m/?2 as it comes to rest. a. From the instant the plane touches the runway, what is the minimum time interval needed before it can come to rest? b. Can this plane land on a small tropical island airport where the runway is 0.9 km long? Why?arrow_forward
- 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.arrow_forwardA a vs. t graph is drawn for a car moving in one direction. The graph shows a horizontal line at a = 5 m/s2 from t = 0 s to t = 5 s. What is the velocity of the ball at t= 5 s? Assume the car is initially at rest. (Answer is given as 25m/s, just need help knowing how to solve it.)arrow_forwardAn object is at x = 0 at t = 0 and moves along the x axis according to the velocity-time graph in Figure P2.62. (a) What is the object’s acceleration between 0 and 4.0 s? (b) What is the object's acceleration between 4.0 s and 9.0 s? (c) What is the object's acceleration between 13.0 s and 18.0 s? (d) At what time(s) is the object moving with the lowest speed? (e) At what time is the object farthest from x = 0? (1) What is the final position x of the object at t = 18.0 s? (g) Through what total distance has the object moved between t = 0 and t = 18.0 s?arrow_forward
- Two children are playing on a 151-m-tall bridge. One child drops a rock (initial velocity zero) at t = 0. The other waits 1.1 s and then throws a rock downward with an initial speed Vo. If the two rocks hit the ground at the same time, what is vo? m/sarrow_forwardA ball tossed into the air from a bridge, and its height, y (in feet), above the ground t seconds after it is thrown is given by y = f(t) = -1612 + 38t + 28. a) How high above the ground is the bridge? The height of the bridge = feet b) What is the average velocity of the ball in for the first second? feet/second c) Find the velocity of the ball at t = 1 second. feet/second d) Decide at what time, t, the ball reaches its maximum height. Round the answer to one decimal place. t = secondsarrow_forwardGretchen runs the first 4.0 km of a race at 5.0 m/s. Then a stiff wind comes up, so she runs the last 1.0 km at only 4.0 m/s. If she later ran the same course again, what constant speed would let her finish in the same time as in the first race?arrow_forward
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