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Question: The speed of 3oz tennis ball is changed from 60 ft/s in one direction to 80ft/s in the opposite one as a racket hits it.Calculate the impulse.if the contact time is 0.005 sec, what is the average contact force?
Before starting this problem, review COnceptual Example 3. Suppose that hail described there bounces off the roof of the car with a velcity of +15 m/s. calculate the force exerted by the hail of the roof
A 3500 kg parked car, with brakes off and free to move, What percentage of the kinetic energy is lost in the collision
A starship voyages to a distant planet 10 ly away. The explorers stay 1.0yr , return at the same speed, and arrive back on earth 26yr after they left. How much time has elapsed on the astronauts' chronometers
In the continuous-caster process, steel sheets 25.3 thick, 2.04 wide, and 11.0 long are produced at a temperature of 870. What are the dimensions of a steel sheet once it has cooled to 21.0?
A violinist is tuning her instrument to concert A (440Hz). Now, when she tightens her violin strings slightly she hears 4.00 beats per second. What was the frequency of her violin
A series RCL circuit contains a 24.7-? resistor, a 1.95-?F capacitor, and a 6.02-mH inductor. When the frequency is 2870 Hz, what is the power factor of the circuit
A near-sighted woman cannot focus on any object farther away than a distance x = 57 cm. Find the focal length of the lens which will correct her vision
question1viscoelasticity a deformation of cross-linked polymeric microgel particle carbopol is described by the
A magnetic field has a magnitude of 0.0011 T, and an electric field has a magnitude of 4.4 × 103 N/C. obtain the magnitude of the net force that acts on the charge
A hydrogen atom initially in the ground state absorbs a photon, which excites it to the = 4.00 state, estimate the frequency of the photon
A century ago, scientists believed that the universe was infinite with no beginning and no end. Einstein then predicted that the universe is either contracting or expanding. Why do you think Einstein thought that the universe had no beginning? Do you..
Three capacitors all have the same capacitance. When they are wired in series, the equivalent capacitance is 57 ?F. what would the charge on the capacitors be
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