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At a carnival, you can try to ring a bell by striking a target with a 9 kg hammer. In response, a 0.4 kg metal piece is sent upward toward the bell, which is 5 m above. Suppose that 25% 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?
A nylon guitar string has a linear density of 5.56 g/m and is under a tension of 161 N. The fixed supports are D = 74.4 cm apart. The string is oscillating in the standing wave pattern shown in the figure. Calculate the (a) speed, (b) wavelength, and..
A police officer is driving due north at a constant speed of27 m/s relative to the ground when shenotices a truck on the east-west highway ahead of her, driving we stat a high speed.
A diver of mass 70kg jumps off a board 10m above the water. what average upward force did the water exert on him
The combination of an applied force and a friction force produces a constant total torque of35.3N · m on a wheel rotating about a fixed axis. Find the magnitude of the torque due to friction
A 5.00 kg chunk of ice is sliding at 13.0 m/s on the floor of an ice-covered valley when it collides with and sticks to another 5.00 kg chunk of ice that is initially at rest. how high above the valley floor will the combined chunks go
A firecracker explodes in reference frame S at t = 2.0 s . A second firecracker explodes at the same position at t = 5.0s . In reference frame S', What is the position of the two explosions in frame S
A dentist uses a mirror to examine a tooth. The tooth is 1.04 cm in front of the mirror, and the image is formed 11.1 cm behind the mirror. Determine the mirror's radius of curvature
A model of a helicopter rotor has four blades, each of length 3.90 m from the central shaft to the blade tip, What is the linear speed of the blade tip
A snowboarder of mass 79 kg travels down the slope of height 150 m, what is the work done on her by friction
A child's toy consists of a piece of plastic attached to a spring. The spring is compressed against the floor a distance of 1.2 cm, and the toy is released. If the spring constant is 103 N/m, what is the magnitude of the spring force acting on the..
Suppose the pilot, starting again from rest, opens the throttle partway. Find the net force acting on the boat
A neutron star has a mass of 2.0 1030 kg (about the mass of oursun) and a radius of 4.8 103 m (about the heightof a good-sized mountain). Suppose an object falls from rest nearthe surface of such a star. How fast would it be moving after ithad fall..
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