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For Exercises 1 through 5:
a. Draw an interaction diagram.
b. Identify the "system" on your interaction diagram.
c. Draw a free-body diagram for each object in the system. Use dashed lines to connect members of an action/reaction pair.
1. A soccer ball and a bowling ball have a head-on collision at this instant. Rolling friction is negligible.
2. A weightlifter stands up at constant speed from a squatting position while holding a heavy barbell across his shoulders.
3. A steel cable with mass is lifting a girder. The girder is speeding up.
4. Block A in FIGURE EX7.4 is heavier than block B and is sliding down the incline. All surfaces have friction. The rope is massless, and the massless pulley turns on frictionless bearings. The rope and the pulley are among the interacting objects, but you'll have to decide if they're part of the system.
FIGURE EX7.4 and FIGURE EX7.5
5. Block A in FIGURE EX7.5 is sliding down the incline. The rope is and the massless pulley turns on frictionless bearings, but the surface is not frictionless. The rope and the pulley are among the interacting objects, but you'll have to decide if they're part of the system.
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Chapter 7 Solutions
Physics for Scientists and Engineers: A Strategic Approach, Vol. 1 (Chs 1-21) (4th Edition)
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- A 1300 kg car A struck a parked car B with mass 1200kg. the wheels of car B jams a break and known to slide 2m after the impact. If the coefficient of kinetic friction between car B and the road is 0.80 and the coefficient of restitution is 0.40. a. What is the velocity of B after impact? b. What is the velocity of A before impact? c. How long does Car slides after impact before it stops? 'arrow_forwardThree boxes in contact slide side-by-side on a smooth, friction-less, horizontal floor. Their masses are 5.0-kg, 3.0-kg, and 2.0-kg, with the 3.0-kg box in the center. A force of 50 N pushes on the 5.0-kg box, which pushes against the other two boxes. A. Draw the free-body diagrams for each of the boxes. B. What magnitude force does the 3.0-kg box exert on the 5.0-kg box? C. What magnitude force does the 3.0-kg box exert on the 2.0-kg box?arrow_forwardA stuntman drives a car of mass 1125 kg east with a speed of 20 m/s. a. If the car accelerates at a rate of –2 m/s 2 , how long will it take the car to go 50 m? b. The stuntman drives the car off an 80 m cliff while going 15 m/s. How long will it take the car to land? c. How far horizontally from the cliff will the car land?arrow_forward
- 2. A 1,480-N crate is being pushed across a level floor at a constant speed by a force F of 370 N at an angle of 20.0° below the horizontal, as shown in the figure a below. The floor has some amount of friction. 20.0° a a. Draw a free body diagram of all the forces on the crate. b. Write out one equation for the y component of the resultant force. Hint: The crate does not move in the y direction. Write out one equation for the x component of the resultant force. Hint: the crate moves in the x direction. C. d. Determine the Normal force. e. What is the coefficient of kinetic friction between the crate and the floor? (Enter vour answer to at least three decimal places.)arrow_forwardSuppose a 1000 kg car hits a 10 kg shopping cart head-on. The shopping cart feels an average force of 10,000 N directed to the left. a.) How hard does the shopping cart push back on the car? N Select an answer b.) If the shopping cart is accelerated from rest to 30 m/s, how much speed does the car lose? m/s. c.) How long do the shopping cart and car push on each other? Desmos Calculator Check Answerarrow_forwardA 23 kg child goes down a straight slide inclined 38° above horizontal. The child is acted on by his weight, the normal force from the slide, and kinetic friction.a. Draw a free-body diagram of the child.b. How large is the normal force of the slide on the child?arrow_forward
- University Physics Volume 1PhysicsISBN:9781938168277Author:William Moebs, Samuel J. Ling, Jeff SannyPublisher:OpenStax - Rice University
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