7.) A 4kg mass is spun around in a horizontal circle on a table using a 0.3-m-long piece of string. It's spinning at a rate of 5 rad/s. How much work does the string do on the mass as it rotates in one revolution? A) 333.33 J B) 628.32 J C) 73.89 J D) 555.55 J E) OJ 8.) Two blocks are held off a ledge of height h. The two blocks have masses m and 3m. They are dropped at the same time. What is the ratio of the velocities of the two blocks (i.e. Viight/Vheavy)? A) 0.11 B) 0.33 C) I D) 3 E) 9

7.) A 4kg mass is spun around in a horizontal circle on a table using a 0.3-m-long piece of string. It's spinning at a rate of 5 rad/s. How much work does the string do on the mass as it rotates in one revolution? A) 333.33 J B) 628.32 J C) 73.89 J D) 555.55 J E) OJ 8.) Two blocks are held off a ledge of height h. The two blocks have masses m and 3m. They are dropped at the same time. What is the ratio of the velocities of the two blocks (i.e. Viight/Vheavy)? A) 0.11 B) 0.33 C) I D) 3 E) 9

Name: 7.) A 4kg mass is spun around in a horizontal circle on a table using
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Description: 7.) A 4kg mass is spun around in a horizontal circle on a table using a 0.3-m-long piece ofstring. It's spinning at a rate of 5 rad/s. How much work does the string do on the mass as it rotates in onerevolution?A) 333.33 JB) 628.32 JC) 73.89 JD) 555

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter6: Applications Of Newton’s Laws Of Motion

Section: Chapter Questions

Problem 75PQ: Two children, with masses m1 = 35.0 kg and m2 = 43.0 kg, are swinging on a tire swing attached to a...

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To develop muscle tone, a woman lifts a 2.00-kg weight held in her hand. She uses her biceps muscle to flex the lower arm through an angle of 60.0°. (a) What is the angular acceleration if the weight is 24.0 cm from the elbow joint, her forearm has a moment of inertia of 0.250kg-m2 and the net force she exerts is 750 N at an effective perpendicular lever arm of 2.00 cm? (b) How much work does she do?
The puck in Figure 10.25 has a mass of 0.120 kg. The distance of the puck from the center of rotation is originally 40.0 cm, and the puck is sliding with a speed of 80.0 cm/s. The string is pulled downward 15.0 cm through the hole in the frictionless table. Determine the work done on the puck. (Suggestion: Consider the change of kinetic energy.)
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In each situation shown in Figure P8.12, a ball moves from point A to point B. Use the following data to find the change in the gravitational potential energy in each case. You can assume that the radius of the ball is negligible. a. h = 1.35 m, = 25, and m = 0.65 kg b. R = 33.5 m and m = 756 kg c. R = 33.5 m and m = 756 kg FIGURE P8.12 Problems 12, 13, and 14.
A 3.00-kg object has a velocity (6.00i1.00j)m/s. (a) What is its kinetic energy at this moment? (b) What is the net work done on the object if its velocity changes to (8.00i+4.00j)m/s. (Note: From the definition of the dot product, v2=vv.)
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A body moves in a circle at constant speed. Does the centripetal force that accelerates the body do any work? Explain.
Two children, with masses m1 = 35.0 kg and m2 = 43.0 kg, are swinging on a tire swing attached to a tree overhanging a pond. The mass of the tire is negligible. At the lowest point of the swinging motion, the tension in each of the three vertical 4.00-m-long chains supporting the swing is 275 N. a. What is the speed of the children at the lowest point of the swinging motion? b. What is the force exerted on each child by the tire at the lowest point of the swinging motion?
35.) If a 0.50 kg ball is moving at a speed of 12 m/s what is the kinetic energy of the ball? Equation is KE= 1/2 mv2 a. 3.0 J b. 36 J c. 48 J
Per: 1. A child is pulling a wagon with toys of varying masses in it. The combined mass of the wagon and the toys is initially 10 kg. The initial velocity is 0.89 m/s. Read each of the sentences that describe a change to the wagon and/or toys. For each scenario, circle whether the kinetic energy increases, decreases, or stays the same. A. The child increases the velocity of the wagon to 0.92 m/s. KE increases KE decreases KE remains the same B. The child removes a toy bear of mass 0.23 kg and the velocity remains the same. KE increases KE decreases KE remains the same C. The velocity of the wagon decreases to 0.27 m/s. KE increases KE decreases KE remains the same D. The child turns the wagon around, and its new velocity is -1.12 m/s. KE increases KE decreases KE remains the same E. The child adds 2.1 kg of rocks to the wagon and the velocity decreases to 0.71 m/s. KE increases KE decreases KE remains the same F. The child adds toys until the total mass is 11.6 kg, and the velocity…
A spacecraft moves around Earth in a circular orbit with a constant radius. How much work is done by the gravitational force on the spacecraft during one revolution? 5. B. - Fod C. mgh D. % mv E. zero A. Fad 6. A construction worker holds a heavy tool box. How much work is done by the worker? A. Fod B. - Fed C. mgh D. % mv E. zero 7. A container with a mass of 5 kg is lifted to a height of 8 m. How much work is done by the gravitational force? D. 50J A. 400J B. -400 J C. zero E. -50) 8. A container with a mass of 5 kg is lifted to a height of 8 m. How much work is done by the external force? A. 400J B. -400 ) C. zero D. 50J E. -50J A container with a mass of 5 kg is lifted to a height of 8 m and then returned back to the ground level. How much work is done by the gravitational force? E. -50) B. -400) C. zero D. 50J A. 400) 10. An object is thrown straight up. Which of the following is true about the sign of work done by the gravitational force while the object moves up and then down?…
A horizontal carousel is rotating around its axis with constant angular velocity w. On the carousel there is a straight track passing through its middle. A cart of mass m is traveling along the track with constant velocity v relative to the carousel. Note that there is friction between the cart and the carousel. FR XR