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A child bounces a 56 g superball on the side walk. The velocity change of the superball is from 24 m/s downward to 18 m/s upward. If the contact time with the sidewalk is 1/800 s, what is the magnitude of the force exerted on the superball by the sidewalk?
Answer in units of N.
A beam of neutrons with a de Broglie wavelength of 0.260nm diffracts from a crystal of table salt, which has an interionic spacing of 0.280nm, What is the speed of the neutrons
A drop of water on a countertop reflects light from a flower held 2.2 cm directly above it. What is the focal length of the water drop
A frictionless, vertical wire has two metal beads on it. The beads are held 30 cm apart by horizontal magnets, If the two beads each have a mass of 49.7 g, what is the kinetic energy of the second immediately after impact
A glacier moves with a speed of 54 nm/s. How many years would it take for the glacier to move 0.81 km
A space traveler weighs 535 N on earth. What would the traveler weigh on another planet whose radius is three times that of earth and whose mass is twice that of earth.
a slingshot consists of a light leather cup containing a stone. the cup is pulled back against two parallel rubber
A charge of - 0.580uC exerts an upward force of magnitude 0.170N on an unknown charge which is a distance of 0.300m directly below it. What is the unknown charge
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An object is oscilliating on a spring with a period of 4.60 s . At time t= 0.00 s the object has zero speed and is at x = 8.30 cm
two speakers are placed side-by-side and are driven by the same frequency of 420. hz. if the distance from a man to one
A 722 kg car stopped at an intersection is rear-ended by a1620 kg truck moving w/ a speed of 14.5 m/s. What is the speed of the wreck immediately after the collision
A person with a mass of 60 kg climbs up to a diving board 4 meters above a swimming pool. How much work does the person do
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