Tarzan crosses a gorge by swinging in an arc from a hanging vine. This is a process of Choose the answer A) momentum conservation b) energy conservation c) both energy and momentum conservation d) neither energy nor momentum conservation
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Tarzan crosses a gorge by swinging in an arc from a hanging vine. This is a process of
Choose the answer
A) momentum conservation
b) energy conservation
c) both energy and momentum conservation
d) neither energy nor momentum conservation
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- A running man has half the kinetic energy of a boy half his mass. The man speeds up by 1.0m/s and then has the same kinetic energy as the boy. What were the original speeds of (a) the man and (b) the boy?Ronaldo is playing outside and shoots a ball of mass 2 kg horizontally with a speed of 8.0 m/s toward a green cart. The mass of the green cart is 15 kg and it rolls at a speed of 1.0 m/s along a horizontal path with no friction. The ball gets stuck in the card. What is the velocity of the cart after the ball strikes it? What are the initial and final kinetic energies of the system? Is the energy conserved in this collision process? What type of collision process is it?A 65 kg person rides a 20 kg bicycle at a speed of 11 m/s. The cyclist runs into a parked car and comes to a fast stop. The bike collapses 0.95 m during the crash. a) Determine the kinetic energy of the cyclist/bike before the crash. b) Find the average force exerted on the cyclist/bike by the parked car.
- Harold the Hurler is a physics student who is renowned for his baseball pitching arm. In order to determine the amount of work he performs in throwing a baseball, Harold devises an experiment. He stands at the bottom of a deep pit and hurls a 0.147 kg0.147 kg baseball through an open third‑floor window in a nearby building. Harold's aim is so accurate that the ball then smoothly enters the tube of the Baseball Absorber that Harold invented and patented. In this device, the ball compresses a spring until it comes momentarily to rest, and this maximum amount of compression is recorded as 0.437 m.0.437 m. The spring's force constant is 813 N/m,813 N/m, and the position of the baseball's momentary rest is 7.73 m7.73 m above ground level. The point in the pit where the Hurler starts his pitch is 11.7 m11.7 m below ground level. How much work does Harold perform on the baseball? Take ?=9.80 m/s2.A moving hammer drives a nail into the wood. It has kinetic energy. a) True b) FalseA 4 kg block moving right at 6 m/s collides elastically with a 2 kg block moving right at 3 m/s. Calculate the final kinetic energy. What is the velocity of a 10 kg object move if an average power of 120 watts is used and the applied force is parallel to the surface? 1.22 m/s 12.2 m/s 0.82 m/s 102 m/s 82 m/s
- How much force is acting upon a dog food can weighing 0.368 kg that rolls 6 inches at a velocity of 1.3 m/s before falling off of a ledge. Knowing that the force of gravity is 9.8m/s, calculate and qualitatively describe the transfer of energy and momentum that occurs. Apply principles of conservation of energy and momentum to this behavior.Based on the kinetic energy of each object, which of the scenarios likely describes an object possessing 1 J of kinetic energy? a) a tiger running after prey b) an elephant running across a field c) a mosquito flying through a swamp d) a beetle walking across a jungle floor e) a cat walking down a sidewalkAt a carnival, you can try to ring a bell by striking a target with a 9.10-kg hammer. In response, a 0.410- kg metal piece is sent upward toward the bell, which is 5.05 m above. Suppose that 22.0% of the hammer's kinetic energy is used to do the work of sending the metal piece upward. How fast must the hammer be moving when it strikes the target so that the bell just barely rings?
- Calculate the kinetic energy of a 300 g baseball thrown at a velocity of 44 m/s. NAS 440 J 290 J 580 J 510 J 13.2 JReleasing some frustration at the end of the semester, you throw your physics book (mass of 4.3 kg) off of a 24 m tall building. You throw your book so that it has a speed of 3 m/s right after you let go. What is the kinetic energy of your book after you let go? (in J) 12.9 1.01×103 206 0 19.4 How how fast is your textbook moving right before it lands? For now, ignore friction. (in m/s) 21.9 17.5 24.7 21.5 If friction is NOT negligible, and 350 J of the textbook's energy is converted to thermal energy as it falls, how fast is it moving just before it lands? (in m/s) 17.8 17.5 12.8 25.3 25.0What is the speef of the bomb after the push? What about the speed of the astronaut after the push? How much energy did the astronaut expend pushing the bomb away?