Consider a block of mass 25 kg being pulled up a rough incline by a 250-N pulling force parallel to the incline. The incline makes an angle of 24 degrees with the horizontal. The coefficient of kinetic friction is 0.34, the block has an initial speed of 1.28 m/s and was pulled a total distance of 3.15 m. a. How much work is done by gravity? b. How much energy is lost due to friction? c. How much work is done by the pulling force? d. Compute for the net work done on the block. e. What is the speed of the crate after being pulled 3.15 m?
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- A. Calculate the work done by the force of gravity when a 7.0 kg object is lifted to a height of 46.0 m above the ground.B. Calculate the velocity with which the object strikes the ground if dropped from that height, using the principle of conservation of energy.C. Calculate the kinetic energy (KE) and the potential energy (PE) of the object at apoint halfway on the path (i.e. at a height of 23.0 m) after it is dropped. To do this, you need to find the object's velocity at that position using an equation of motion. What is the total energy of the object at that point? Does this verify the principle of conservation of energy?A 5.00 gram bullet moving horizontally with a speed of 400 m/s collides with a wooden block. After moving 2.00 cm into the block the bullet stops moving. Was work done on the bullet? If so describe the type of work and the force that did the work. a. yes, negative work, force is in the opposite direction as the initial velocity of the bullet b. yes, positive work, force is in the same direction as the initial velocity of the bullet c. yes, positive work, force is in the opposite direction as the initial velocity of the bullet d. No work was done on the bullet e. yes, negative work, force is in the same direction as the initial velocity of the bulletA box of 10.0 kg is accelerated from rest by a horizontal force at a rate of 2.0 m/s2 for 10.0 seconds. a. What is the net work is done on the box? b. How much does the object’s kinetic energy change? c. How much power is exerted by the force, in Watts?
- C 4. A box is being pulled across a rough floor with a force P. What can you say about the work done by pulling force, normal force, friction, and gravitational force? 0, W by normal force > 0, Wby friction 0, Why normal force 0, W by normal force= D. Wby pulling force <0, Why normal force = 0, W by friction <0, W by gravitational force = 0 0, W by friction <0. Wby gravitational force = 0Imagine Sophia is moving down a slide and her body never leaves the slide.Which is the most correct option?A block of mass 2.28 kg starts sliding from rest down an incline plane for 25 cm. If the block has a velocity of 1.14 m/s, and the incline has an angle measured from the +x axis of 37 degrees then: a. How much work did kinetic friction do on the block? b. What is the coefficient of kinetic friction between the block and the incline?
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- A bicycler is moving at 8m/s when they reach the top of a 20m high hill. They coast 15m to the bottom of the hill. They are moving 15m/s when they reach the bottom of the hill. The combined mass of the bicycler and the bicycle is 95kg. a. Calculate the work done by friction on the bicycler. b.Calculate the magnitude of the force of friction acting on the bicycle.A crate with mass m = 33.3 kg being pushed up an incline that makes an angle φ = 22.7 degrees with horizontal. The pushing force is horizontal, with magnitude P, and the coefficient of kinetic friction between the crate and the incline is μ = 0.358. Consider the work done on the crate as it moves a distance d = 5.32 m at constant speed. a. What is work done by the pushing force, in joules? b. What is the work done by friction, in joules? c. What is the work done by gravity, in joules? d. What is the net work, in joules?A hand pushes a 3 kg block along a table from point A to point C as shown in the figure below. The table has been prepared so that the left half of the table (from A to B) is frictionless. The right half (from B to C) has a non-zero coefficient of friction equal to µ. The hand pushes the block the full distance from A to C using a constant force of 5 N. The block starts off at rest at point A and comes to a stop when it reaches point C. The distance from A to B is 0.5 m and the distance from B to C is also 0.5 m. We will consider the block by itself as our system so all forces on the block are external. Initial position of block Final position ofblock P no friction friction A B C -1½ m 1½ m