1. A 40-kg child sits on a swing held by a light rope. At the low...
1. A 40-kg child sits on a swing held by a light rope. At the low point of the swing, the child is moving 4 m/s. How high above the low point will the child rise before they stop?
2. A cannon ball is fired upward at 45 degrees above the horizontal and rises to a max height of 1000 m. What is the muzzle velocity of the cannon?
3. A cannon ball is fired upward at 45 degrees above the horizontal and rises to a max height of 1000 m. What forms of energy does the cannonball have at the top of its trajectory?
4. A brick weighing 50 newtons slows as it slides 4 m across a horizontal floor. If the coefficient of kinetic friction between the brick and the floor is 0.2, find the change in kinetic energy.
5. A block slides down a slope inclined at 37 degrees. If the slope is frictionless and the block starts off at rest, how fast is it moving after it has traveled 1 meter along the plane? Apply energy-conservation principles to solve.
6. A block slides down a slope inclined at 37 degrees. If the slope is frictionless and the block starts off at rest, how fast is it moving after it has traveled 1 meter along the plane? Apply energy-conservation principles to solve.
Homework Answers
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1. A 40-kg child sits on a swing held by a light rope. At the
low...
on 41. A 25 kg child plays on a swing having support ropes that are 2.2...
on 41. A 25 kg child plays on a swing having support ropes that are 2.2 m long. A friend pull back until the ropes are 42 degrees from the vertical and releases her from rest. (a) What is the potential energy of the child just as she is released, compared with the potential energy at the bottom of the swing? (b) how fast will she be moving at the bottom of the swing? (c) how much work does the...
A 20.0 kg child plays on a swing having support ropes that are 2.30 m long....
A 20.0 kg child plays on a swing having support ropes that are 2.30 m long. A friend pulls her back until the ropes are 39.0 degrees from the vertical and releases her from rest. What is the potential energy for the child just as she is released, compared with the potential energy at the bottom of the swing? How fast will she be moving at the bottom of the swing? How much work does the tension in the ropes...
10. A small object of mass m, on the end of a light cord, is held...
10. A small object of mass m, on the end of a light cord, is held horizontally at a distance r from a fixed support as shown. The object is then released. What is the tension in the cord when the object is at the lowest point of its swing? 11. A wooden brick slides on a horizontal frictionless floor with a constant velocity v. On the brick's path there is a 50 cm long rough area with a friction...
Problem 1 [10 pts] A 20.0 kg child plays on a swing having support ropes that...
Problem 1 [10 pts] A 20.0 kg child plays on a swing having support ropes that are 2.0 m long. A friend pulls her back until the ropes are 45.0° from the vertical and releases her from rest. a) What is the potential energy for the child just as she is released, compared with the potential energy at the bottom of the swing? b) How fast will she be moving at the bottom of the swing? c) How much work...
1. An 8.25 kg sits at rest on an inclined plane with an angle of 18.8...
1. An 8.25 kg sits at rest on an inclined plane with an angle of 18.8 degrees, 11.2 cm from the base of the inclined plane. The coefficient of static friction between the block and inclined plane is 0.55 The incline plane is slowly adjusted until the block starts sliding down the plane. At what angle will the block start moving? 2. A 12.0 kg sign hangs from the end of a 2.00 m long horizontal beam. What is the...
.1. A horizontal force of 60.0 N is applied to a 3.00 kg block. The block...
.1. A horizontal force of 60.0 N is applied to a 3.00 kg block. The block is initially at rest and slides a distance of 0.500 m up a ramp once the horizontal force is applied. The ramp is inclined at an angle of 30.0◦ and the coefficient of kinetic friction between the ramp and the block is 0.600. (a) Use Newton’s second law and kinematics to determine how long it took for the block to slide 0.500 m up...
please explain and write neatly 1. Once again we have a skier on an inclined plane....
please explain and write neatly
1. Once again we have a skier on an inclined plane. The skier has mass M and starts from rest. Her speed at the bottom of the slope is 12.0 meters/second. The hill is inclined 30 degrees from the horizontal and the length of the slope is 100.0 meters. Use the law of conservation of energy to determine her final speed and write that number down here: What could account for the difference in your...
A mass m = 1 kg slides down a θ = 30◦ inclined plane from a...
A mass m = 1 kg slides down a θ = 30◦ inclined plane from a
height of 5 m. At the bottom of the incline, it collides with
another mass M = 3 kg, and the latter is initially at rest as shown
in Fig. 3. The surface to the right of the inclined plane on which
the 3 kg (green) mass sits is horizontal.
(a) The inclined surface is frictionless. Conserve energy to
find the velocity of the...
1a,b,c Energy Practice PHY-203 Page 1 of 4 Name: 1. An initially stationary block of mass...
1a,b,c
Energy Practice PHY-203 Page 1 of 4 Name: 1. An initially stationary block of mass 0.25 kg is launched horizontally by a spring of spring constant 600 N/m which is initially compressed 10 cm from its equilibrium position. The block travels along a rough, horizontal surface to the base of a frictionless incline angled 30° above the horizontal. The block rises l m vertically up the incline before momentarily coming to a rest. (a) How much work was done...
1a,b,c Energy Practice PHY-203 Page 1 of 4 Name: 1. An initially stationary block of mass...
1a,b,c
Energy Practice PHY-203 Page 1 of 4 Name: 1. An initially stationary block of mass 0.25 kg is launched horizontally by a spring of spring constant 600 N/m which is initially compressed 10 cm from its equilibrium position. The block travels along a rough, horizontal surface to the base of a frictionless incline angled 30° above the horizontal. The block rises l m vertically up the incline before momentarily coming to a rest. (a) How much work was done...
on 41. A 25 kg child plays on a swing having support ropes that are 2.2 m long. A friend pull back until the ropes are 42 degrees from the vertical and releases her from rest. (a) What is the potential energy of the child just as she is released, compared with the potential energy at the bottom of the swing? (b) how fast will she be moving at the bottom of the swing? (c) how much work does the...
10. A small object of mass m, on the end of a light cord, is held horizontally at a distance r from a fixed support as shown. The object is then released. What is the tension in the cord when the object is at the lowest point of its swing? 11. A wooden brick slides on a horizontal frictionless floor with a constant velocity v. On the brick's path there is a 50 cm long rough area with a friction...
please explain and write neatly
1. Once again we have a skier on an inclined plane. The skier has mass M and starts from rest. Her speed at the bottom of the slope is 12.0 meters/second. The hill is inclined 30 degrees from the horizontal and the length of the slope is 100.0 meters. Use the law of conservation of energy to determine her final speed and write that number down here: What could account for the difference in your...
A mass m = 1 kg slides down a θ = 30◦ inclined plane from a
height of 5 m. At the bottom of the incline, it collides with
another mass M = 3 kg, and the latter is initially at rest as shown
in Fig. 3. The surface to the right of the inclined plane on which
the 3 kg (green) mass sits is horizontal.
(a) The inclined surface is frictionless. Conserve energy to
find the velocity of the...
1a,b,c
Energy Practice PHY-203 Page 1 of 4 Name: 1. An initially stationary block of mass 0.25 kg is launched horizontally by a spring of spring constant 600 N/m which is initially compressed 10 cm from its equilibrium position. The block travels along a rough, horizontal surface to the base of a frictionless incline angled 30° above the horizontal. The block rises l m vertically up the incline before momentarily coming to a rest. (a) How much work was done...
1a,b,c
Energy Practice PHY-203 Page 1 of 4 Name: 1. An initially stationary block of mass 0.25 kg is launched horizontally by a spring of spring constant 600 N/m which is initially compressed 10 cm from its equilibrium position. The block travels along a rough, horizontal surface to the base of a frictionless incline angled 30° above the horizontal. The block rises l m vertically up the incline before momentarily coming to a rest. (a) How much work was done...
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