This print out should have 19 questions. be within + 3.0% Multiple choice questions may continue on the next column or page - find all choices 007 (part 1 of 3) 10.0 points before answering- A block of mass 2.8 kg, which has an initial velocity of 4.4 m/s at time : = 0, slides on a 001 (part 1 of 5) 10.0 points horizontal surface. An 18 6 kg block is dragged over a rough, hor- Calculate the work that must be done on izontal surface by a constant force of 85.9 N the block to bring it to rest. acting at an angle of angle 30.1" above the Answer in units of J. horizontal. The block is displaced $3.5 m and the coefficient of kinetic friction is 0.159. 008 (part 2 of 3) 10.0 points BRON If a constant friction force of 5.9 Newtons is exerted on the block by the surface, what is the acceleration? 156 kg Answer in units of m/s'- = 0.159 009 (part 3 of 3) 10.0 points Determine the distance that the block slides Find the work done by the 88.9 N force. as it comes to rest. The acceleration of gravity is 9.8 m/s' . Answer in units of m. Answer in units of J. 010 10.0 points 002 (part 2 of 5) 10.0 points A ball is thrown upward. At a height of 10 Find the magnitude of the work done by the meters above the ground, the ball has a po- force of friction. tential energy of 50 Joules (with the potential Answer in units of J. energy equal to zero at ground level) and is moving upward with a kinetic energy of 50 003 (part 3 of 5) 10.0 points Joules. What is the sign of the work done by the What is the maximum height h reached by frictional force? the ball? Consider air friction to be negligible. 1. positive 1. 2. negative A = 30 m 3. TO 2. he: 50 m 004 (part 4 of 5) 10.0 points 3. Find the work done by the normal force. h : 40 m Answer in units of J. 4. he: 20 m 005 (part 5 of 5) 10.0 points 5. What is the net work done on the block? h= 10m Answer in units of J. 0ll 10.0 points 10.0 points A frictionless pendulum of length $ m swings A force of 150 N used to push a chair across a with an amplitude of 10". At its maximum room does 300 J of work. How far does the chair displacement, the potential energy of the pen- move in this process? dulum is 10 J. Answer in units of m. Your answer must What is the kinetic energy of the pendulum when its potential energy is 5 J?1. K = 15 J 198 g 2. K =5J 3. K = 3.3 1 4. K = 10 J 4.8 m 5. K = 6.7J 15 m 2.4 mm 012 10.0 points In an arcade game a 0.136 kg disk is shot across a frictionless horizontal surface by com- pressing it against a spring and releasing it. What is the speed u of the block when it If the spring has a spring constant of leaves the track? 158 N/m and is compressed from its equi- Answer in units of m/s. librium position by 5 em, find the speed with which the disk slides across the surface. 015 (part 2 of 3) 10.0 points Answer in units of m/s. What is the horizontal distance a the block travels in the air? 013 10.0 points Answer in units of m. A bead slides without friction around a loop- the loop. The bead is released from a height 016 (part 3 of 3) 10.0 points of 27.3 m from the bottom of the loop-the- What is the total speed of the block when it loop which has a radius 9 m. hits the ground? The acceleration of gravity is 9.8 m/s'. Answer in units of m/s. 017 (part 1 of 3) 10.0 points A block of mass 475 g is pushed against the spring (located on the left-hand side of the 9 m track) and compresses the spring a distance 27.4 m 4.9 cm from its equilibrium position (as shown in the figure below). The block starts from rest, is accelerated by the compressed spring. and slides across a frictionless horizontal track (as shown in the figure below). It leaves the What is its speed at point A? track horizontally, flies through the air, and Answer in units of m/s. subsequently strikes the ground. The acceleration of gravity is 9.81 m/s_ 014 (part 1 of 3) 10.0 points A block starts at rest and slides down a fric- 475 tionless track except for a small rough area on a horizontal section of the track (as shown in the figure below ). 1.9 am 2.4 m It leaves the track horizontally, flies through the air, and subsequently strikes the ground. The acceleration of gravity is 9.8 m/s'. 3.45 m What is the spring constant? Answer in units of N/m. 018 (part 2 of 3) 10.0 pointsWhat is the speed u of the block when it leaves the track? Answer in units of m/s. 010 (part 3 of 3) 10.0 points What is the total speed of the block when it hits the ground? Answer in units of m/s