Physics Fundamentals
2nd Edition
ISBN: 9780971313453
Author: Vincent P. Coletta
Publisher: PHYSICS CURRICULUM+INSTRUCT.INC.
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Chapter 1, Problem 8P
To determine
The average speed of runner in
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During 5 successive 1.02 min intervals, a runner moved at the following constant speed: 0.388km/min, 0.226 km/min, 0.160 km/min, 0.160 km/min and 0.320 km/min. Compute the total distance traveled and the average speed.
Total distance
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A motorist drives north for 32.0 minutes at 80.5 km/h and then stops for 15.0 minutes. He then continues north, traveling 130 km in 1.80 h.
(a) What is his total displacement?
In heavy traffic, a car travels 26.3 km in 31.0 min. Assuming the velocity is constant, determine how long it will take to travel an additional 49.6 km and report your result in minutes.
Chapter 1 Solutions
Physics Fundamentals
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- In heavy traffic, a car travels 39.2 km in 35.5 min. Determine the average velocity of the car over the 35.5 min span, and report your answer in km/hr.arrow_forwardIf it takes a horse 175 seconds to make 3.00 laps around a horse track (each lap is equal to 1.00 km), what was the horse's average velocity in m/s when he crosses the start/finish line? Be sure to answer to the correct number of significant digits and include units.arrow_forwardSleds propelled by rockets are used to study how humans react to sudden acceleration. If a rocket-powered sled accelerates to a speed of 442.82 m/s in 1.71 seconds, what is the sled's acceleration (measured in meters per second squared)? Only the final answer, stated to three decimal places, should be rounded off.arrow_forward
- Suppose that you drive the 10.0 km from your university to home in 20.0 min. Calculate your average speed (a) in kilometersper hour (km/h) and (b) in meters per second (m/s). (Note: Average speed is distance traveled divided by time of travel.)arrow_forwardThe following data were taken on five cars traversing a 1.6-km highway. Car Time (minutes) A 1.9 B 1.2 C 1.8 D 1.1 E 1.9 Determine the traffic density, in vehicles per km. Express your answer in 2 decimal places.arrow_forwardCompute your average velocity in the following two cases: (a) You walk 64.0 m at a speed of 1.28 m/s and then run 64.0 m at a speed of 3.98 m/s along a straight track. (b) You walk for 1.00 min at a speed of 1.28 m/s and then run for 1.39 min at 3.98 m/s along a straight track.arrow_forward
- The "reaction time" of the average automobile driver is about 0.70 s. (The reaction time is the interval between the perception of a signal to stop and the application of the brakes.) An automobile can slow down with an acceleration of 10.6 ft/s2. 1) Compute the total distance covered in coming to a stop after a signal is observed from an initial velocity of 15.8 mi/hmi/h (in a school zone). Express your answer in feet. 2) Compute the total distance covered in coming to a stop after a signal is observed from an initial velocity of 57.4 mi/hmi/h. Express your answer in feet.arrow_forwardA pilot flies in a straight path for 1h 30 min. She then makes a course correction, heading 11 degrees to the right of her original course, and flies 2 h in the new direction. If she maintains a constant speed of 625 mi/h, how far is she from her starting position? (Round your answer to the nearest mile.)arrow_forwardA pilot flies in a straight path for 1 h 30 min. She then makes a course correction, heading 11 degrees to the right of her original course, and flies 2 h in the new direction. If she maintains a constant speed of 625 mi/h, how far is she from her starting position? (Round your answer to the nearest mile.)arrow_forward
- A baseball is thrown straight down from a height of 38 meters. If the ball strikes the ground at 30 m/s, at what speed (m/s) was it thrown at? g= 9.80 m/s/s Answer to 3 sig figs (or 1 decimal)arrow_forwardThe acceleration of an object (in m/s2) is given by the function a(t)=7sin(t)a(t)=7sin(t). The initial velocity of the object is v(0)=−1v(0)=-1 m/s. Round your answers to four decimal places. v(t) = -7cos(t) + 6 The objects displacement from time 0 to 3 is: 17.01216 meters Find the total distance traveled by the object from time 0 to time 3.arrow_forwardAn airplane travels at 169 mi/h south for 2.00 h and then at 295 mi/h north for 636 miles. What is the average speed for the trip? Express answers in mi/h. estimate to 2 decimalsarrow_forward
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