COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 6, Problem 48QAP
To determine
Velocity of the block.
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80. A driver slams on the brakes, leaving 88.0-m-long skid
marks on the level road. The coefficient of kinetic friction is
estimated to be 0.480. How fast was the car moving when the
driver hit the brakes? Example 6-11
cooler of water? Example
43 ..A statue is crated and moved for cleaning. The mass of
the statue and the crate is 150 kg. As the statue slides down a
ramp inclined at 40.0°, the curator pushes up, parallel to the
ramp's surface, so that the crate does not accelerate (Figure 6-40).
If the statue slides 3.0 m down the ramp, and the coefficient of
kinetic friction between the crate and the ramp is 0.54, calculate
the work done on the crate by each of the following: (a) the
itational force, (b) the curator, (c) the friction force, and (d) the
normal force between the ramp and the crate. SSM Example 6-3
grav-
3) A block with a mass of 2000 kg starts to move with zero initial velocity from point "A" and
as shown in the figure, it hits the barrier at point "B" at a distance of 8 m with a speed of 0,6
m/s. As it is known that there is friction between the inclined surface and the block;
a) Calculate the kinetic friction coefficient between the block and the inclined surface.
b) Find how far the barge will travel in the horizontal direction when the block reaches point
"B", neglecting the water resistance. The mass of the barge is 20000 kg.
Chapter 6 Solutions
COLLEGE PHYSICS
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- A cart is set rolling across a level table, al the same speed on every trial. If it runs into a patch of sand, the cart exerts on the sand an average horizontal force of 6 N and travels a distance of 6 cm through the sand as it comes to a stop. If instead the cart runs into a patch of Hour, it rolls an average of 18 cm before stopping. What is the average magnitude of the horizontal force the cart exerts on the flour? (a) 2 N (b) 3 N (c) 6 N (d) 18 N (e) none of those answersarrow_forwardA cart is set rolling across a level table, at the same speed on every trial. If it runs into a patch of sand, the cart exerts on the sand an average horizontal force of 6 N and travels a distance of 6 cm through the sand as it comes to a stop. It instead the cart runs into a patch of gravel on which the can exerts an average horizontal force of 9 N, how far into the gravel will the cart roll before stopping? (a) 9 cm (b) 6 cm (c) 4 cm (d) 3 cm (e) none of those answersarrow_forwardA 5.0-kg box rests on a horizontal surface. The coefficient of kinetic friction between the box and surface is K=0.50 . A horizontal force pulls the box at constant velocity for 10 cm. Find the work done by (a) the applied horizontal force, (b) the frictional force, and (c) the net force.arrow_forward
- A frictionless plane is 10.0 m long and inclined at 35.0. A sled starts at the bottom with an initial speed of 5.00 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 vi. 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_forwardIn the dangerous sport of bungee jumping, a daring student jumps from a hot air balloon with a specially designed elastic cord attached to his waist. The unstretched length of the cord is 25.0 m, the student weighs 7.00 102 N, and the balloon is 36.0 m above the surface of a river below. Calculate the required force constant of the cord if the student is to stop safely 4.00 m above the river.arrow_forward(a) A child slides down a water slide at an amusement park from an initial height h. The slide can be considered frictionless because of the water flowing down it. Can the equation for conservation of mechanical energy be used on the child? (b) Is the mass of the child a factor in determining his speed at the bottom of the slide? (c) The child drops straight down rather than following the curved ramp of the slide. In which case will he be traveling faster at ground level? (d) If friction is present, how would the conservation-of-energy equation be modified? (e) Find the maximum speed of the child when the slide is frictionless if the initial height of the slide is 12.0 m.arrow_forward
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- 86. A 3.00-kg block is placed at the top of a track consisting of two frictionless quarter circles of radius R = 2.00 m connected by a 7.00-m-long, straight, horizontal surface (Figure 6-52). The coefficient of kinetic friction between the block and the horizontal surface is uk = 0.100. The block is released from rest. What maximum vertical height does the block reach on the the track? Example 6-11 right-hand section of x = 0 R Freedman, College Physics, 3e, 2021 W. H. Freeman and Company Figure 6-52 Problem 86 87. An object is released from rest on a frictionless ramp of angle 0₁ = 60.0°,arrow_forwardd 13) A 10 kg box is initially at rest at the top of a frictionless inclined plane that rises at 30° above the horizontal. At the top, the box is initially 8.0 m from the bottom of the incline, as measured along the incline (see figure). When the box is released from this position, it eventually stops at a distance d from the bottom of the inclined plane along a horizontal surface, as shown. The coefficient of kinetic friction between the horizontal surface and the box is 0.20, and air resistance is negligible. Find the distance d in meters. Hint: You can use dynamics and kinematics but applying conservation of energy may be much easier. W₁-K₁-K₁ W₁ = d Fid=14-1₂ 8.0 m 30° A) 20 m B) 15 m C) 25 m D) 5.0 m E) 10 m any?arrow_forwardA block is given a short push and then slides with constant friction across a horizontal floor. Which statement best explains the direction of the force that friction applies on the moving block? - Friction will be in the opposite direction of the block's motion because thermal energy generated at the interface between the block and the floor converts some of the block's kinetic energy to potential energy. - Friction will be in the same direction as the block's motion because molecular interactions between the block and the floor will deform the block in the direction of motion. -Friction will be in the same direction as the block's motion because thermal energy generated at the interface between the block and the floor adds kinetic energy to the block. - Friction will be in the opposite direction of the block's motion because molecular interactions between the block and the floor will deform the block in the opposite direction of motion.arrow_forward
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