please help with question number 10, 12,13, 14 and 15 10 The diagram below shows two identical woodenplanks, A and B, at different incline angles. Theplanks are used to slide concrete blocks from thebed of a truck.Truck bed30Compared to the amount of work done againstfriction by a block sliding down plank A, thework done against friction by a block slidingdown plank B is(1) less(2) more(3) the same 12 What is the minimum power required for aconveyor to raise an 8.0-newton box 4.0 metersvertically in 8.0 seconds?(1) 260 W(2) 64 W(3) 32 W(4) 4.0 W13 A weightlifter lifts a 200-kilogram mass a verticaldistance of 0.5 meter in 0.1 second. What is thelifter's power output?(1) 1 × 10¬4 W(2) 4 x 10 4 W(3) 1 × 10' W(4) 4 × 10ʻ W14 A 4.0 × 10-watt motor applies an 8.0 x 10²-newton force to move a boat at constant speed.How far does the boat move in 16 seconds?(2) 5.0 m (3) 32 m(1) 3.2 m(4) 80. m15 A boat weighing 9.0 × 10' newtons requires ahorizontal force of 6.0 × 10' newtons to move itacross the water at 1.5 × 10' meters per second.The boat's engine must provide energy at therate of(1) 2.5 x 102J(2) 4.0 x 10' W(3) 7.5 x 10' J(4) 9.0 × 10' W

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Description: please help with question number 10, 12,13, 14 and 15 10 The diagram below shows two identical woodenplanks, A and B, at different incline angles. Theplanks are used to slide concrete blocks from thebed of a truck.Truck bed30Compared to the amount of

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10 The diagram below shows two identical wooden planks, A and B, at different incline angles. The planks are used to slide concrete blocks from the bed of a truck. Truck bed 45." Compared to the amount of work done against friction by a block sliding down plank A, the work done against friction by a block sliding down plank B is (1) less (3) the same (2) more

10 The diagram below shows two identical wooden planks, A and B, at different incline angles. The planks are used to slide concrete blocks from the bed of a truck. Truck bed 45." Compared to the amount of work done against friction by a block sliding down plank A, the work done against friction by a block sliding down plank B is (1) less (3) the same (2) more

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter5: Energy

Section: Chapter Questions

Problem 7P: A tension force of 175 N inclined at 20.0 above the horizontal is used to pull a 40.0-kg packing...

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Starting from rest, a 5.00-kg block slides 2.50 m down a rough 30.0 incline. The coefficient of kinetic friction between the block and the incline is k = 0.436. Determine (a) the work done by the force of gravity, (b) the work done by the friction force between block and incline, and (c) the work done by the normal force. (d) Qualitatively, how would the answers change if a shorter ramp at a steeper angle were used to span the same vertical height?
. A motorist runs out of gas on a level road 200 m from a gas station. The driver pushes the 1.200-kg car to the gas station. If a 150-N force is required to keep the car moving, how much work does the driver do?
A horizontal force of 150 N is used to push a 40.0-kg packing crate a distance of 6.00 m on a rough horizontal surface. If the crate moves at constant speed, find (a) the work done by the 150-N force and (b) the coefficient of kinetic friction between the crate and surface.
Confirm the value given for the kinetic energy of an aircraft carrier in Table 7.1. You will need to look up the definition of a nautical mile (1knot=1nauticalmile/h) .
Suppose you are reshelving books in a library. As you lift a book from the floor and place it on the top shelf, two forces act on the book: your upward lifting force and the downward gravity force. (a) Is the mechanical work done by your lifting force positive, zero, or negative? (b) Is the work done by the gravity force positive, zero, or negative? (c) Is the sum of the works done by both forces positive, zero, or negative?
Calculate the work done by an 85.0-kg man who pushes a crate 4.00 m up along a ramp that makes an angle of 20.0° with the horizontal. (See Figure 7.35.) He exerts a force of 500 N on the crate parallel to the ramp and moves at a constant speed. Be certain to include the work he does on the crate and on his body to get up the ramp. Figure 7.35 A man pushes a crate up a ramp.
What does work on a shuffleboard puck as it slides to rest? Why is the board dusted, and how does this affect work?
Spiderman, whose mass is 80.0 kg, is dangling on the free end of a 12.0-m-long rope, the other end of which is fixed to a tree limb above. By repeatedly bending at the waist, he is able to get the rope in motion, eventually getting it to swing enough that he can reach a ledge when the rope makes a 60.0 angle with the vertical. How much work was done by the gravitational force on Spiderman in this maneuver?
Review. You can think of the workkinetic energy theorem as a second theory of motion, parallel to Newtons laws in describing how outside influences affect the motion of an object. In this problem, solve parts (a), (b), and (c) separately from parts (d) and (e) so you can compare the predictions of the two theories. A 15.0-g bullet is accelerated from rest to a speed of 780 m/s in a rifle barrel of length 72.0 cm. (a) Find the kinetic energy of the bullet as it leaves the barrel. (b) Use the workkinetic energy theorem to find the net work that is done on the bullet. (c) Use your result to part (b) to find the magnitude of the average net force that acted on the bullet while it was in the barrel. (d) Now model the bullet as a particle under constant acceleration. Find the constant acceleration of a bullet that starts from rest and gains a speed of 780 m/s over a distance of 72.0 cm. (e) Modeling the bullet as a particle under a net force, find the net force that acted on it during its acceleration. (f) What conclusion can you draw from comparing your results of parts (c) and (e)?
If the man in Exercise 5 pushes the mower with 40% of the force directed horizontally, then how much work is done?
A worker pushing a 35.0-kg wooden crate at a constant speed for 12.0 m along a wood floor does 350 J of work by applying a constant horizontal force of magnitude F0 on the crate. (a) Determine the value of F0. (b) If the worker now applies a force greater than F0, describe the subsequent motion of the crate. (c) Describe what would happen to the crate if the applied force is less than F0.
The person in Figure 7.33 does work on the lawn mower. Under what conditions would the mower gain energy? Under what conditions would it lose energy?