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Concept explainers
For Exercises I 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 massless, 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)
- A 48.42kg hunter ropes a 167.82 kg sleeping polar bear and pulls the bear towards him until they meet. Originally they are 211.22 m apart on frictionless ice. When the hunter pulls the polar bear to him the hunter will move... a. 52 b. 810 c. 67 d. 160arrow_forward2. A model rocket has a mass of 300 g and an engine that generates 40 N of thrust. The rocket is launched vertically, so that the trust is directed straight up. It is a windy day, and the wind generates a constant force of 5 N horizontally to the east; you can ignore any other forces from the air such as air drag for this problem. A. Draw a free body for this rocket shortly after launch while the engine is firing. B. What is the net force on the rocket after launch while the engine is firing? Express your answer in component form. C. How much time does it take for the rocket to reach an altitude of 250 m?arrow_forward5. A baseball is thrown upward from a height of 3 meters above Earth's surface with an initial velocity of 10m/s, and the only force acting on it is gravity. The ball has a mass of 0.15kg at Earth's surface. A. Find the velocity v(t) of the baseball at time t. B. What is its velocity after 2 seconds? C. The graph of the baseballarrow_forward
- You push a 40.0 kg box across a floor at a constant velocity of 1.00 m/s. the coefficient of kinetic friction is ?k = 0.15. a. Draw a free body diagram. b. Decide of which type of problem-solving technique you need, inertial or dynamic. c. Determine the value of your push in newtonsarrow_forwardA lady pulls a cart with a force of 1800 N. Neglecting friction, if the cart changes from resting to a speed of 1.25 m/s in a distance of 0.2 m, what is the total mass of the cart? Show detailed solution. a. 715 kg c. 480 kgb. 460 kg d. 220 kgarrow_forwardA 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_forward
- Suppose 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 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_forwardA 20-kg monkey has a firm hold on a light rope that passes over a frictionless pulley and is attached to a 20-kg bunch of bananas. The monkey looks up, sees the bananas, and starts to climb the rope to get them. a. The monkey releases her hold on the rope. What happens to the distance between the monkey and the bananas while she is falling? b. Before reaching the ground, the monkey grabs the rope to stop her fall. What do the bananas do?arrow_forward
- A soccer player kicks a stationary 0.425 kg ball giving it a speed of 13.7 m/s. The player’s foot is in contact with the ball for 0.097 second. What is the average force when the player kick the ball? a. 6 N b. 5.8 N c. 60 N d. 84 Narrow_forward3.2.2 Represent and reason Two blocks are connected with a light string that runs over two light pulleys.arrow_forwardQuestion 1 - A light block of mass m and a heavy block of mass M are attached to the ends of a rope. A student holds the heavier block and lets the lighter block hang below it, as shown in the figure. Then she lets go. Air resistance can be neglected. A. What is the tension in the rope while the blocks are being held? Explain. Marrow_forward
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