a) The acceleration of a 5.0 kg box is 2.5 ms?. when a horizontal force is applied across a surface having a coefficient of friction of 0.5, as shown in Figure 3. a = 2.5 ms-2 7 kg Hk = 0-5 Figure 3 Find the work done over a distance of 25 cm by ix. the horizontal force the frictional force, and Х. xi. the net force. xii. what is the change in kinetic energy of the box?
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- A. Suppose you lift a 15 kg box by a height of 1.0 m. How much work do you do in lifting the box? Express your answer using two significant figures. B. Instead of lifting the box straight up, suppose you push it up a 1.0-m-high ramp that makes a 30 ∘ degree angle with the horizontal, as shown in (Figure 1). Being clever, you choose a ramp with no friction. How much force is required to push the box straight up the slope at a constant speed? Express your answer using two significant figures. C. How long is the ramp? Express your answer using two significant figures. D. Use your force and distance results to calculate the work you do in pushing the box up the ramp. Express your answer using two significant figures.1. You must exert a force of 4.5 N on a book to slide it across a table. If you do 2.7 J of work in the process, how far have you moved the book? 2. A child pulls a sled up a snow covered hill. The child does 405 J of work on the sled. If the child walks 15 m up the hill, how large of a force must the child exert? 3. How much work is done on a small car if a 3150 N force is exerted to move it 75.5 m to the side of the road?1. Draw a situation where a force is doing zero work. Explain why the force is doing no work, include pictures if needed?
- Match each term1. Calculate the work done from x=0.0 to x = 7.0 m by the one-dimensional force depicted in the following graph. Suppose that Fo= 70 N, calculate the total work by the force over 7.0 m. Fo -Fo AA 1 2 3 5 6 Enter to 2 significant figures W= x (m)A 70-kg hiker hikes from an elevation of 1,209 m to an elevation 2,199m. i. What is the hiker’s change in potential energy during this hike? ii. What is the smallest possible amount of work done by the hiker? iii. Is it possible that the hiker did more work thanthis? Explain why.
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- A man pushes a cart 25m at a constant speed on ground level, against a 36N frictional force. He pushes in a direction that is 28.5 degrees below the horizontal. A. What is the work done by gravity, friction, and the man? B. Find the force in N that the shopper exerts using energy consideration. (give your answer as a magnitude) C. What is the total work done by all forces on the cart?713 a) Calculate the work done when a 5.0 kg bag of apples is lifted 1.2 m off the ground. 13 c) Calculate the power developed when the action of lifting the apples takes 2.0 s.