College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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- 0.350 and 0.480. Vehicles of all types travel on the road, from small VW bugs weighing 1110 lb to large trucks weighing 7650 lb. Considering that some drivers will brake properly when slowing down and others will skid to stop, calculate the minimum and maximum braking distance needed to ensure that all vehicles traveling at the posted speed limit can stop before reaching the intersection. minimum braking distance: ft maximum braking distance: ft Given that the goal is to allow all vehicles to come safely to a stop before reaching the intersection, calculate the maximum desired speed limit. maximum speed limit: mph Which factors affect the soundness of your decision? Precipitation from the fog can lower the coefficients of friction. Drivers cannot be expected to obey the posted speed limit. Reaction time of the drivers is not taken into account. Newton's second law does not apply to this situation.arrow_forwardA 4.4 kg block located on a horizontal floor is pulled by a cord that exerts a force F = 10 N at an angle theta = 35 degrees above the horizontal, as shown. The floor has a coefficient of kinetic friction µk = 0.1. What is the magnitude of the acceleration [m/s2] of the block? What is the horizontal speed [m/s] of the block 4.4 seconds after it starts moving?arrow_forwardDetermine the force Q-> when the block moves with constant velocity. Express your answer in vector form.arrow_forward
- A car with a mass of 1.3x103 kg is skidding to a stop along a horizontal surface. The car decelerates from 33 m/s to rest in 3.9 seconds. Assuming negligible air resistance, determine the coefficient of friction between the car tires and the road surface. μ =_________arrow_forwardYou place a crate of mass 47.7 kg on a frictionless 3.61-meter-long incline. You release the crate from rest, and it begins to slide down, eventually reaching the bottom 1.15 s after you released it. What is the angle of the incline? 1 50.7 degrees 76.1 degrees 3. 42.3 degrees 4 33.8 degreesarrow_forwardA car of mass 822 kg is traveling 26.4 m/a when the driver applies the brakes, which lock the wheels. The car skids for 4.47 s in the positive x direction before coming to rest. What is the cars acceleration in m/ s2? what magnitude force in N acted on the car during this time? How far in m did the car travel?arrow_forward
- A student is pulling a crate with a mass of 66.6 kg along a horizontal frictionless floor with a rope that’s inclined at an angle θ = 30.0° above the horizontal as shown. The tension force is measured to be 239 N. What is the magnitude of the normal force on the crate from the floor, in Newtons? Use g = 10.0 m/s2. Your answer needs to have 3 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement.arrow_forwardA 5-kg block is set into motion up an inclined plane (30°) with an initial speed of 8.0 m/s. There is friction between the block and the plane. The block comes to rest after traveling 3.0 m along the plane. Define the positive x-direction to be down the ramp.arrow_forwardA man wants to move a heavy wooden crate (82 kg) across a wooden floor. However, since he is taller than the crate, he must pull it using a rope that makes an angle of 42 degrees with the horizontal. He exerts a force of 312 N as he pulls. What is the Normal Force exerted by the floor on the crate? What is the size of the Friction Force felt by the crate, if the crate moves at a constant speed in a straight line? Imagine that instead the floor is more slick, so that the crate feels a friction force half of what you calculated above. What is the crate’s acceleration?arrow_forward
- A crate of mass m = 2.00 kg is released from rest at the top of an inclined plane as seen in the figure. The crate starts out at height = 0.100 m above the top of the table, the table height is H = 2.00 m, and 0 = 41.0⁰. H ↑ h i (a) What is the acceleration (in m/s2) of the crate while it slides down the incline? m/s² m (b) What is the speed (in m/s) of the crate when it leaves the incline? m/s (c) At what horizontal distance (in m) from the end of the table will the crate hit the ground? m O No (d) How long (in s) from when the crate is released does it hit the ground? S (e) Does the crate's mass affect any of your above answers? Yesarrow_forwardA 85-kg man stands on a spring scale in an elevator. Starting from rest, the elevator ascends, attaining its maximum speed of 1.2 m/s in 0.91 s. The elevator travels with this constant speed for 5.0 s, undergoes a uniform negative acceleration for 1.2 s, and then comes to rest. (a) What does the spring scale register before the elevator starts to move? N (b) What does the spring scale register during the first 0.91 s of the elevator's ascent? N (c) What does the spring scale register while the elevator is traveling at constant speed? N (d) What does the spring scale register during the elevator's negative acceleration? Narrow_forwardYou place a crate of mass 20.3 kg on a frictionless 2.61-meter-long incline. You release the crate from rest, and it begins to slide down, eventually reaching the bottom 1.01 s after you released it. What is the angle of the incline? 37.7 degrees 31.4 degrees 44.0 degrees 57.2 degreesarrow_forward
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