Physics Fundamentals
2nd Edition
ISBN: 9780971313453
Author: Vincent P. Coletta
Publisher: PHYSICS CURRICULUM+INSTRUCT.INC.
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Chapter 5, Problem 47P
To determine
To evaluate: The truck is moving on a curve with radius of 100 m and speed
Calculate the speed of car increasing at
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A 201-kg log is pulled up a ramp by means of a rope that is parallel to the surface of the ramp. The ramp is inclined at 30.0 degrees with respect to the horizontal. The coefficient of kinetic friction between the log and the ramp is 0.810, and the log has an acceleration of 0.700 m/s2. Find the tension in the rope.
Part of a roller-coaster ride involves coasting down an incline and entering a loop 7.30 m in diameter. For safety considerations, the roller coaster's speed at the top of the loop must be such that the force of the seat on a rider is equal in magnitude to the rider's weight. From what height above the bottom of the loop must the roller coaster descend to satisfy this requirement? m
The 137-lb force P is applied to the 240-lb crate, which is stationary before the force is applied. Determine the magnitude and
direction of the friction force F exerted by the horizontal surface on the crate. The friction force is positive if to the right, negative if to
the left.
Assume μ = 0.51, Mk = 0.39.
P
Answer: F =
i
Mk
lb
Chapter 5 Solutions
Physics Fundamentals
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- 3. A 2.65-kg box is sliding down a ramp with an initial speed of 1.25 m/s. The angle of the ramp is 18.0°, and the coefficients of friction between the ramp and the box are μ = 0.575 and μ = 0.425. a. Find the magnitudes of the net force and the acceleration in the direction parallel to the surface of the ramp. b. Use the acceleration to determine how far the box travels down the ramp before it stops. c. Calculate how much time it takes for it to slide to a stop. Vo = 1.25 m/s 18.0⁰ Earrow_forwardTwo masses are being pulled up a 30.0 degree incline by a force F parallel to the incline. The acceleration down the incline is 1.00 m/s2 and the velocity is up the incline. The force is applied to a 200 kg mass, and a string connects the 200 kg mass to a 150 kg mass. The coefficient of kinetic friction is 0.200. The tension in the string isarrow_forwardA.)By pulling a on rope attached to a crate of mass 73.0 kg, the crate is dragged across a floor. Let the coefficient of static friction between the crate and the floor be 0.600 and the angle between the rope and horizontal is 33.1 °. Find the minimum force required to move the crate. B.)arrow_forward
- A 2.03 kg book is placed on a flat desk. Suppose the coefficient of static friction between the book and the desk is 0.442 and the coefficient of kinetic friction is 0.240. How much force is needed to begin moving the book? How much force is needed to keep the book moving at constant speed once it begins moving?arrow_forwardYou are at the grocery store pushing on a shopping cart. The mass of the cart including all the delicious food you will buy is 26.0 kg. The coefficient of friction between the floor and the wheels of the shopping cart is 0.30. In order to accelerate the cart to 2.40 m/s from rest in 2.50 m, what force must you apply to the cart?arrow_forwardA box of bananas weighing 40.0 N rests on a horizontal surface.The coefficient of static friction between the box and the surfaceis 0.40, and the coefficient of kinetic friction is 0.20. What is the magnitude of the friction force if a monkey applies a horizontal force of 6.0 N to the box and the box is initially at rest?arrow_forward
- must be used? Ans: 39 N Question 12. A skier is pulled up a slope at a constant velocity by a tow bar. The slope is inclined at 24.2° with respect to the horizontal. The force applied to the skier by the tow bar is parallel to the slope. The skier's mass is 56.7 kg, and the coefficient of kinetic friction between the skis and the snow is 0.140. Find the magnitude of the force that the tow bar exerts on the skier. Ans: 299 N What is thearrow_forwardA 260-kg log is pulled up a ramp by means of a rope that is parallel to the surface of the ramp. The ramp is inclined at 30.0 with respect to the horizontal. The coefficient of kinetic friction between the log and the ramp is 0.870, and the log has an acceleration of 0.800 m/s2. Find the tension in the rope.arrow_forwardA stubborn, 115 kgkg mule sits down and refuses to move. To drag the mule to the barn, the exasperated farmer ties a rope around the mule and pulls with his maximum force of 800 NN. The coefficients of friction between the mule and the ground are 0.75 and 0.51. What is the force of static friction between the mule and the ground?arrow_forward
- You give a 2.10 kg box a hard shove at the bottom of a ramp, and it leaves your hand with a speed of 8.50 m/s. The ramp is inclined at an angle of 30.0o, and the coefficient of kinetic friction between the ramp and the box is 0.300. The box slides up the ramp and eventually stops. What is the magnitude of the acceleration of the box while it is sliding up the ramp? select correct answer. a) 7.45 m/s2b) 7.84 m/s2c) 15.6 m/s2d) 11.5 m/s2arrow_forwardA worker pushes a box with mass 11.2 kg on a horizontal surface with a constant speed of 3.50 m/s. The coefficient of kinetic friction between the box and the surface is 0.20. a) What horizontal force must the worker apply to maintain the motion. b) If the force calculated in part (a) is removed, how far does the box slide before coming to rest?arrow_forwardThe 121-lb force P is applied to the 250-lb crate, which is stationary before the force is applied. Determine the magnitude and direction of the friction force F exerted by the horizontal surface on the crate. The friction force is positive if to the right, negative if to the left. Assume μ = 0.45, μk = 0.36. Answer: F= i lbarrow_forward
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