College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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The kinetic friction force between a 61.0-kg object and a horizontal surface is 45.0 N. If the initial speed of the object is 27.0 m/s, and friction is the only force acting on the object, what distance will it slide before coming to a stop? (round to the nearest whole number)
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- A elevator accelerates upward in 3.2 s to a final speed of 7.2 m/s. Determine the apparent weight of a passenger with mass of 56 kg.arrow_forwardYou push a box up a slope with kinetic friction at a constant speed. Which of these is true? O AK = 0, AUg > 0, AEmech > 0, AÉth > 0 O AK > 0, AUg > 0, AEmech >0, AEth > 0 O AK = 0, AUg > 0, AEmech = 0, AEth > 0 O AK > 0, AUg 0arrow_forwardFrom a standstill, a 77.0 kg basketball player bends their knees and pushes against the floor andextends legs vertically 30.0 cm before jumping vertically off the ground and reaches a maximumheight of 25.0 inches above the ground. Assume the force the floor exerts on the player is constant.What is the force the floor exerts on the player? Give answer in lbs. (Let 4.45 N = 1 lb., 1 inch = 2.54 cm)arrow_forward
- Two crates of fruit are released from the top of a ramp inclined at 30 degrees from the horizontal and 4.5 meter long. The two crates consist of an apple crate of mass 20 kg that is placed in front of a watermelon crate of mass 80 kg. The apple crate has a coefficient of friction of 0.20 while the watermelon crate has a coefficient of friction of 0.15. How long does it take the apple crate to reach the bottom of the incline if it needs to travel a distance of 4.5 meters?arrow_forwardA car with a mass of 1.2x103 kg is skidding to a stop along a horizontal surface. The car decelerates from 32.2 m/s to rest in 3.89 seconds. Assuming negligible air resistance, determine the coefficient of friction between the car tires and the road surface. Answer: μ =_________ (no units) (rounded to nearest hundredths place)arrow_forwardAn airplane starts from rest on the runway. The engines exert a constant force of 78.0 kN on the body of the plane (mass 9.20 × 104 kg) during takeoff. How far down the runway does the plane reach its takeoff speed of 64.6 m/s?arrow_forward
- A frictionless plane is 10.0 m long and inclined at 42.0°. A sled starts at the bottom with an initial speed of 5.70 m/s up the incline. When the sled reaches the point at which it momentarily stops, a second sled is released from the top of the incline with an initial speed v. Both sleds reach the bottom of the incline at the same moment. (a) Determine the distance that the first sled traveled up the incline. (b) Determine the initial speed of the second sled.arrow_forwardYou place a crate of mass 26.3 kg on a frictionless 4.29-meter-long incline. You release the crate from rest, and it begins to slide down, eventually reaching the bottom 1.66 s after you released it. What is the angle of the incline? 18.5 degrees 22.2 degrees 26.6 degrees 20.4 degreesarrow_forwardThree forces acting on an object are given by F₁ = (-1.95î + 6.60ĵ) N, F₂ = (4.651 – 1.85ĵ) N, and F3 = (-43.51) N. The object experiences an acceleration of magnitude 3.65 m/s². (a) What is the direction of the acceleration? O (counterclockwise from the +x-axis) (b) What is the mass of the object? kg (c) If the object is initially at rest, what is its speed after 18.0 s? m/s (d) What are the velocity components of the object after 18.0 s? (Let the velocity be denoted by v.) î+ î) m/sarrow_forward
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