10:24 Input page title Re-edit 81. I| A 20 kg wood ball hangs from a 2.0-m-long wire. The maxi- mum tension the wire can withstand without breaking is 400 N. A 1.0 kg projectile traveling horizontally hits and embeds itself in the wood ball. What is the greatest speed this projectile can have without causing the wire to break? 2/2 Rotate Mark Recognize Share More

10:24 Input page title Re-edit 81. I| A 20 kg wood ball hangs from a 2.0-m-long wire. The maxi- mum tension the wire can withstand without breaking is 400 N. A 1.0 kg projectile traveling horizontally hits and embeds itself in the wood ball. What is the greatest speed this projectile can have without causing the wire to break? 2/2 Rotate Mark Recognize Share More

College Physics

10th Edition

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter4: The Laws Of Motion

Section: Chapter Questions

Problem 12WUE: An Atwoods machine (Fig. 4.38) consists of two masses: one of mass 3.00 kg and the other of mass...

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Balancing carefully, three boys inch out onto a horizontal tree branch above a pond, each planning to dive in separately. The third boy in line notices that the branch is barely strong enough to support them. He decides to jump straight up and land back on the branch to break it, spilling all three into the pond. When he starts to carry out his plan, at what precise moment does the branch break? Explain. Suggestion: Pretend to be the third boy and imitate what he does in slow motion. If you are still unsure, stand on a bathroom scale and repeat the suggestion.
A 0.450-kg hammer is moving horizontally at 7.00 m/s when it strikes a nail and comes to rest after driving the nail 1.00 cm into a board. Assume constant acceleration of the hammer-nail pair. a. Calculate the duration of the impact. b. What was the average force exerted on the nail?
What force does a trampoline have to apply to a 45.0-kg gymnast to accelerate her straight up at 7.50 m/s2? Note that the answer is independent of the velocity of the gymnast—she can be moving either up or down, or be stationary.
The front 1.20 m of a 1 400-kg car Ls designed as a crumple zone that collapses to absorb the shock of a collision. If a car traveling 25.0 m/s stops uniformly in 1.20 m, (a) how long does the collision last, (b) what is the magnitude of the average force on the car, and (c) what is the magnitude of the acceleration of the car? Express the acceleration as a multiple of the acceleration due to gravity.
An Atwoods machine (Fig. 4.38) consists of two masses: one of mass 3.00 kg and the other of mass 8.00 kg. When released from rest, what is the acceleration of the system?
An Atwoods machine (Fig. 4.38) consists of two masses: one of mass 3.00 kg and the other of mass 8.00 kg. When released from rest, what is the acceleration of the system?
Squids are the fastest marine invertebrates, using a powerful set of muscles to take in and then eject water in a form of jet propulsion that can propel them to speeds of over 11.5 m/s. What speed (in m/s) would a stationary 1.40 kg squid achieve by ejecting 0.110 kg of water (not included in the squid's mass) at 3.75 m/s? Neglect other forces, including the drag force on the squid. m/
Squids are the fastest marine invertebrates, using a powerful set of muscles to take in and then eject water in a form of jet propulsion that can propel them to speeds of over 11.5 m/s.What speed (in m/s) would a stationary 1.20 kg squid achieve by ejecting 0.115 kg of water (not included in the squid's mass) at 3.00 m/s? Neglect other forces, including the drag force on the squid.
A 0.51 kg football is thrown with a velocityof 18 m/s to the right. A stationary receivercatches the ball and brings it to rest in 0.020s.What is the force exerted on the receiver?Answer in units of N.
Jennifer, who has a mass of 50.0 kg, is riding at 35.0 m/s in her red sports car when she must suddenly slam on the brakes to avoid hitting a deer crossing the road. She strikes the air bag, that brings her body to a stop in 0.500 s. What average force does the seat belt exert on her? If Jennifer had not been wearing her seat belt and not had an air bag, then the windshield would have stopped her head in 0.002 s. What average force would the windshield have exerted on her?
17. When there is no net force acting on an object, it is either at rest or it moves with constantvelocity. This is Newton's:A. Law of Acceleration C. Law of InertiaB. Law of Interaction D. None of the above18. An astronaut weighs 588 N on the earth. What is the astronaut's mass on moon?A. 0 kg. C. 80 kg.B. 60 kg. D. cannot be determined19. Which of the following situations applies Newton's Third Law of Motion?A. The gun recoils into your shoulder after firingB. Pushing a truck and a car with the same driving force, the car accelerates fasterC. A marathon runner is not able to stop himself after crossing the finish lineD. The bus driver abruptly brakes, pushing the passengers in the forward direction20. An interaction between two objects or between an object and its environmentA. Mass C. AccelerationB. Position Vector D. Force
Lions can run at speeds up to approximately 80.0 km/h. A hungry 109 kg lion running northward at top speed attacks and holds onto a 39.0 kg Thomson's gazelle running eastward at 75.0 km/h. Find the final speed ?fvf of the lion‑gazelle system just after the lion attacks. vf=? in m/s