College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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- A block of mass 2.40 kg is placed against a horizontal spring of constant k = 795 N/mand pushed so the spring compresses by 0.0500 m. HINT (a) What is the elastic potential energy of the block-spring system (in J)? (b) If the block is now released and the surface is frictionless, calculate the block's speed (in m/s) after leaving the spring. m/sarrow_forwardA block of 5 kg is pushed up against a platform that is attached to a spring of 1200 N/m. The spring is compressed 25 cm. The block starts out 5 m from point P and is released from rest. To the left of point P the surface is frictionless. To the right of point P the surface is frictional with coefficients of static and kinetic friction of 0.5 and 0.25, respectively. All parts of this problem must be solved using energy methods with the exception of cases discussed in lecture. a) Calculate the energy stored in the spring. b) What is velocity of the block once it leaves the platform? c) What is the work done by friction once the block is 2 m to the right of point P? d) How far from point P does the block stop?arrow_forwardAs shown in the figure, a 0.570 kg object is pushed against a horizontal spring of negligible mass until the spring is compressed a distance x. The force constant of the spring is 450 N/m. When it is released, the object travels along a frictionless, horizontal surface to point A, the bottom of a vertical circular track of radius R = 1.00 m, and continues to move up the track. The speed of the object at the bottom of the track is vA = 13.0 m/s, and the object experiences an average frictional force of 7.00 N while sliding up the track. (a) What is x? __ m (b) If the object were to reach the top of the track, what would be its speed (in m/s) at that point? __ m/s (c) Does the object actually reach the top of the track, or does it fall off before reaching the top? reaches the top of the trackfalls off before reaching the top not enough information to tellarrow_forward
- A 2.0 kg block is pressed up against a spring (k = 44 N/m) that is attached to a wall as shown. The block is held so that there is 1.2 J stored in the spring and then the block is released from rest. If there is no friction, what is the speed of the block when the energy stored in the spring is 0 J?arrow_forwardPlease explain in detail.arrow_forwardA 1.65 kg block slides with a speed of 0.885 m/s on a frictionless horizontal surface until it encounters a spring with a force constant of 751 N/m. The block comes to rest after compressing the spring 4.15 cm. Find the spring potential energy, U, the kinetic energy of the block, K, and the total mechanical energy of the system, E, for compressions of 0 cm.arrow_forward
- A box of unknown mass is sliding with an initial speed vi = 6.00 m/s across a horizontal frictionless warehouse floor when it encounters a rough section of flooring d = 2.80 m long. The coefficient of kinetic friction between the rough section of flooring and the box is 0.100. Using energy considerations, determine the final speed of the box (in m/s) after sliding across the rough section of flooring.arrow_forwardA block with mass m = 12 kg rests on a frictionless table and is accelerated by a spring with spring constant k = 4696 N/m after being compressed a distance x1 = 0.469 m from the spring’s unstretched length. The floor is frictionless except for a rough patch a distance d = 2.8 m long. For this rough path, the coefficient of friction is μk = 0.42. 1) How much work is done by the spring as it accelerates the block? J 2) What is the speed of the block right after it leaves the spring? m/s 3) How much work is done by friction as the block crosses the rough spot? J 4) What is the speed of the block after it passes the rough spot? m/s 5) Instead, the spring is only compressed a distance x2 = 0.129 m before being released. How far into the rough path does the block slide before coming to rest? m 6) What distance does the spring need to be compressed so that the block will just barely make it past the rough patch when released? m 7) If…arrow_forwardA box is placed against a spring with spring constant 300N/m. The spring is compressed a distance of 2m and then released. How much kinetic energy does the box have after leaving contact with the spring (assuming no frictional losses)? 400 J 500 J 600 J 700 Jarrow_forward
- A basketball player makes a jump shot. The 0.600-kg ball is released at a height of 2.02 m above the floor with a speed of 7.47 m/s. The ball goes through the net 3.10 m above the floor at a speed of 3.90 m/s. What is the work done on the ball by air resistance, a nonconservative force?arrow_forwardA spring (k = 220 N/m) is fixed at the top of a frictionless plane inclined at angle = 40°. A 1.3 kg block is projected up the plane, from an initial position that is distance d = 0.70 m from the end of the relaxed spring, with an initial kinetic energy of 31 J. (a) What is the kinetic energy of the block at the instant it has compressed the spring 0.30 m? (b) With what kinetic energy must the block be projected up the plane if it is to stop momentarily when it has compressed the spring by 0.60 m?arrow_forwardA 1.70 kg block moving with an initial speed of 1.09 m/s slides on a rough horizontal surface until it encounters a spring with a spring constant of 955 N/m. The block comes to rest momentarily after compressing the spring a maximum distance of 2.30 cm. Find the work done by friction during this process. (a) -0.757 J (b) -21.0 J (c) -1.01 J (d) -0.253 J (e) -15.8 Jarrow_forward
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