Part A A 20.0-kg crate sits at rest at the bottom of a 11.5 m -long ramp that is inclined at 35 ° above the horizontal. A constant horizontal force of 290N is applied to the crate to push it up the ramp. While the crate is moving, the ramp exerts a constant frictional force on it that has magnitude 65.0 N. What is the total work done on the crate during its motion from the bottom to the top of the ramp Express your answer to three significant figures and include the appropriate units. HA ? W = 1980 J Submit Previous Answers Request Answer X Incorrect; Try Again; One attempt remaining Part B How much time does it take the crate to travel to the top of the ramp? Express your answer to three significant figures and include the appropriate units. ? t = Value Units P Pearson

A 1300 kg wrecking ball hangs from a 10-m-long cable. The ball is pulled back until the cable makes an angle of 17.0 with the vertical. ▼ Part A By how much has the gravitational potential energy of the ball changed? Express your answer with the appropriate units. AU = 0 μA Value = Units ?

A. Calculate the work done by the force of gravity when a 5.0kg object is lifted to a height of 30.0m 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 and the potential energy of the object at a halfway on the path after it is dropped. To do this part, you need to find the velocity of the object 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?

Part A A 1680 kg car skids on a level road with coefficient of kinetic friction 0.64 between the tires of the car and the road. The car skids a distance of 102 m and comes to a complete stop. The work done on the car by the force of kinetic friction is (enter your answer with two significant figures) possibly useful: W = (Fcose)d w = mg 9 = 9.81 m/s? VAZ中 ? J Submit Request Answer Part B The amount of thermal energy generated while the car was skidding is (enter your answer with two significant figures) AL中 ? J Submit Request Answer

2 kg and M=3 kg, are connected by a very light string passing over a massless and frictionless pulley. The M block moves 3 m to the right with constant speed. A Two blocks of maSses M 147 %3D During this process, how much work is done on the M block by the tension in the string? (Take g= 10 m/s) %3D

on an essentially frictionless, horizontal ice rink, a skater moving at 6.0 m/s encounters a rough patch that reduces her speed by 48 % due to a friction force that is 25 % of her weight. Part A. Use the work-energy theorem to find the length of this rough patch. Express your answer using two significant figures.

Two tugboats pull a disabled supertanker. Each tug exerts a constant force of 2.00x106 N, one at an angle 16.0° west of north, and the other at an angle 16.0° east of north, as they pull the tanker a distance 0.870 km toward the north. Part A What is the total work done by the two tugboats on the supertanker? Express your answer in joules, to three significant figures. ▸ View Available Hint(s) IVE ΑΣΦ 1.9. 10⁹ Submit Previous Answers ? J * Incorrect, Try Again; 5 attempts remaining Review | Constants

PRINTER VERSION 1 BACK NEXT Chapter 08, Problem 045 A rope is used to pull a 5.52 kg block at constant speed 4.57 m along a horizontal floor. The force on the block from the rope is 7.54 N and directed 31.6° above the horizontal. What are (a) the work done by the rope's force, (b) the increase in thermal energy of the block-floor system, and (c) the coefficient of kinetic friction between the block and floor? (a) Number Units (b) Number Units (c) Number Units LINK TO TEXT LINK TO SAMPLE PROBLEM LINK TO SAMPLE PROBLEM Question Attempts: 0 of 5 used SAVE FOR LATER SUBMIT ANSWER