A roof of a house makes an angle of 350 with respect to the horizontal. A...
A roof of a house makes an angle of 350 with respect to the horizontal. A 10 kg chunk of ice is sitting on the root, 5 m from the edge, which is itself 8m above the ground. It was found that on a particular day, when the coefficient of kinetic friction is 0.35, a block that starts from rest and slides off the roof, still wieghing 10 kg, hits the ground with a speed of 13.6 m/s. Let’s see if we can obtain that same result using the work-kinetic energy theorem:
a) What is the work done by the frictional force on the block?
b) What is the work done by the gravitational force on the block?
c) What is the change in kinetic energy of the block?
d) What is the final velocity of the block (assuming it started at rest)?
Homework Answers
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A roof of a house makes an angle of 350 with respect to the
horizontal. A...
How to solve from part F to L 5.12 A 5 kg block is placed on...
How to solve from part F to L
5.12 A 5 kg block is placed on a 10 m long incline which is at an angle of 30° to the horizontal as shown in Figure 5.9. The block is initially stationary and slides down the whole length of the incline. block o 10 m 30° Figure 5.9 If the block slides along the incline with- out friction: (a) What is the component of the grav- itational force in direction of...
A 14 kg block on a horizontal surface is attached to a horizontal spring of spring...
A 14 kg block on a horizontal surface is attached to a horizontal spring of spring constant k = 5.7 kN/m. The block is pulled to the right so that the spring is stretched 15 cm beyond its relaxed length, and the block is then released from rest. The frictional force between the sliding block and the surface has a magnitude of 44 N. (a) What is the kinetic energy of the block when it has moved 3.0 cm from...
The roof of a two-story house makes an angle of 32" with the horizontal. A ball...
The roof of a two-story house makes an angle of 32" with the horizontal. A ball rolling down the roof rolls off the edge at a speed of 5.5 m/s. The distance to the ground from that point is 7.8 m. (a) How long is the ball in the air (6) How far from the base of the house does it land? et upward be the positive direction) (c) What is velocity just before and g component m y component...
help with part 5 1. A 125-kg load is lifted 12.0 m vertically with an acceleration...
help with part 5
1. A 125-kg load is lifted 12.0 m vertically with an acceleration a -0.32g by a single cable. Determine: (a) the tension in the cable, (b) the net work done on the load, (c) the work done by the cable on the load, (d) the work done by gravity on the load, and (e) the final speed of the load assuming it started from rest. 2. A 1.60-m tall person lifts a 2.10-kg book from the...
A block slides from rest, along a track with an elevated left end, a flat central...
A block slides from rest, along a track with an elevated left
end, a flat central part, into a relaxed spring, as shown in the
figure. The curved portion of the track is frictionless, as well as
the first portion of the flat part of L = 10 cm. The coefficient of
kinetic friction between the block and the only rough part, D = 10
cm, is given by k = 0.20. Let the initial height of the block be...
A 10 kg block is dragged by an applied force of 20N, which makes an angle...
A 10 kg block is dragged by an applied force of 20N, which makes an angle of 600 with the horizontal. The coefficient of friction of the surface is. The block starts from rest and is pulled a distance of 7m. Calculate the work done by the applied force? Calculate the work done by the force of friction? What is the resultant work done? What is the final velocity of the block? Recall: work done equals change in kinetic...
On a warm spring day, the last icicle on the roof falls to the ground. The...
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A 2.00-kg-box, starting from rest, slides down a frictionless incline. The incline makes and angle of...
A 2.00-kg-box, starting from rest, slides down a frictionless
incline. The incline makes and angle of ? = 30? from the horizontal
and is fixed to a table. The incline has a maximum height of h =
0.500 m above the table that is itself H = 2.00 m above the ground.
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A horizontal force of magnitude 32.1 N pushes a block of mass 3.91 kg across a...
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A horizontal force of magnitude 41.6 N pushes a block of mass 3.86 kg across a...
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How to solve from part F to L
5.12 A 5 kg block is placed on a 10 m long incline which is at an angle of 30° to the horizontal as shown in Figure 5.9. The block is initially stationary and slides down the whole length of the incline. block o 10 m 30° Figure 5.9 If the block slides along the incline with- out friction: (a) What is the component of the grav- itational force in direction of...
The roof of a two-story house makes an angle of 32" with the horizontal. A ball rolling down the roof rolls off the edge at a speed of 5.5 m/s. The distance to the ground from that point is 7.8 m. (a) How long is the ball in the air (6) How far from the base of the house does it land? et upward be the positive direction) (c) What is velocity just before and g component m y component...
help with part 5
1. A 125-kg load is lifted 12.0 m vertically with an acceleration a -0.32g by a single cable. Determine: (a) the tension in the cable, (b) the net work done on the load, (c) the work done by the cable on the load, (d) the work done by gravity on the load, and (e) the final speed of the load assuming it started from rest. 2. A 1.60-m tall person lifts a 2.10-kg book from the...
A block slides from rest, along a track with an elevated left
end, a flat central part, into a relaxed spring, as shown in the
figure. The curved portion of the track is frictionless, as well as
the first portion of the flat part of L = 10 cm. The coefficient of
kinetic friction between the block and the only rough part, D = 10
cm, is given by k = 0.20. Let the initial height of the block be...
A 2.00-kg-box, starting from rest, slides down a frictionless
incline. The incline makes and angle of ? = 30? from the horizontal
and is fixed to a table. The incline has a maximum height of h =
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(a) Find the accleration of the box during the sliding period. (b)
What is the velocity of the box as it leaves the table. (c) What
horizontal distance...
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