康A hunter wishes to cross a river that is 2.3 km wide and flows with a speed of 5.0 km/h parallel to its banks. The hunter uses a small powerboat that moves at a maximum speed of團補南庫原画 ! 護斯1 漫11 km/h with respect to the water. What is the minimum time necessary for crossing?minSubmit AnswerView Previous Question Question 17 of 24 View Next Question

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College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter2: Motion In One Dimension

Section: Chapter Questions

Problem 55AP: A truck tractor pulls two trailers, one behind the other, at a constant speed of 1.00 102 km/h. It...

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A blue car of length 4.52 m is moving north on a roadway (hat intersects another perpendicular roadway (Fig. P2.81, page 58). The width of the intersection from near edge to far edge is 28.0 m. The blue car has a constant acceleration of magnitude 2.10 m/s2 directed south. The time interval required for the nose of the blue car to move from the near (south) edge of the intersection to the north edge of the intersection is 3.10 s. (a) How far is the nose of the blue car from the south edge of the intersection when it stops? (b) For what time interval is any part of the blue car within the boundaries of the intersection? (c) A red car is at rest on the perpendicular intersecting roadway. As the nose of the blue car enters the intersection, the red car starts from rest and accelerates east at 5.60 m/s2. What is the minimum distance from the near (west) edge of the intersection at which the nose of the red car can begin its motion if it is to enter the intersection alter the blue car has entirely left the intersection? (d) II the red car begins its motion at the position given by the answer to pan (c), with what speed does it enter the intersection?
A truck tractor pulls two trailers, one behind the other, at a constant speed of 1.00 102 km/h. It takes 0.600 s for the big rig to completely pass onto a bridge 4.00 102 m long. For what duration of time is all or part of the truck-trailer combination on the bridge?
The first astronaut has landed on Mars. Conducting some physics experiments, she drops a hammer from rest from a height of 2.01 m and uses a stopwatch to measure that the hammer takes 1.04 s to hit the ground. A. Determine the magnitude of the acceleration due to gravity on Mars. B. She then throws the hammer straight up into the Martian sky. If she comes back to her hand in 4.20 s, with what speed did she throw it?
(the complete question is in the picture) Which of the following best describes an instantaneous speed?A. A marathon runner stopping midway to take a break.B. A runner finishing a 1-km runaround an oval track in 30 [s]C. A traveler walking for 30 [min]D. A typhoon going southeast with130 [km/h] wind speed.
2. (a) A car travels at a constant velocity 50 km h-1 for 100 km. It then speeds up to 100 km h-1for another 100 km. (i) Sketch the velocity against time graph.(ii) Calculate the car average speed for the 200 km trip in unit km h-1
When you normally drive the freeway between Sacramento and San Francisco at an average speed of 115 km/hrkm/hr (71 mi/hmi/h ), the trip takes 1.00 hrhr and 13 minmin . On a Friday afternoon, however, heavy traffic slows you down to an average of 105 km/hrkm/hr (65 mi/hmi/h ) for the same distance. Part A How much longer does the trip take on Friday than on the other days?
Ilya and Anya each can run at a speed of 7.60 mph and walk at a speed of 3.50 mph . They set off together on a route of length 5.00 miles . Anya walks half of the distance and runs the other half, while Ilya walks half of the time and runs the other half. a) Find Anya's average speed. b) How long does it take Ilya to cover the distance? (in minutes) c) Now find Ilya's average speed. Thanks
Maria throws two stones from the top edge of a building with a speed of 12 m/s. The height of the building is 960 meters. She throws one straight down and the other straight up. The first one hits the street in a time t1. How much later is it before the second stone hits? answer in seconds.
a=k(220-v) a0=220m/s v0=0 k=1 initial velocity is zero initial acceleration is 220m/s2, the acceleration is proportional to the velocity 220m/s, how much time passes when the object reaches 176m/s
]=An inquisitive physics student and mountain climber climbs a 55.0-m-high cliff that overhangs a calm pool of water. He throws two stones vertically downward, 1.00 s apart, and observes that they cause a single splash. The first stone has an initial speed of 2.20 m/s. (a) How long after release of the first stone do the two stones hit the water? s (b) What initial velocity must the second stone have if the two stones are to hit the water simultaneously? magnitude m/s direction (c) What is the speed of each stone at the instant the two stones hit the water? first stone m/s second stone m/s
The person realizes they are holding back traffic at 60.0 mph instead of the posted speed limit of 70.0 mph. To stop holding back traffic, the person accelerates to 70.0 mph throughout a time of 8.00s Determine: (a) The acceleration throughout the 8.00s accelerating time interval in S.I. units (b) The distance traveled, in terms of number of light post, throughout the 8.00s accelerating time interval (c) Use one of the first kinematic equations to state the proportional relationship between distance and time
A mountain climber stands at the top of a 20.0 m cliff that overhangs a calm pool of water. She throws two stones vertically downward 1.00 s apart and observes that they cause a single splash. The first stone had an initial velocity of -2.20 m/s. (a) How long after release of the first stone did the two stones hit the water? (Round your answer to at least two decimal places.) (b) What initial velocity must the second stone have had, given that they hit the water simultaneously? (c) What was the velocity of each stone at the instant it hit the water?

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A hunter wishes to cross a river that is 2.3 km wide and flows with a speed of 5.0 km/h parallel to its banks. The hunter uses a small powerboat that moves at a maximum speed of 11 km/h with respect to the water. What is the minimum time necessary for crossing? min