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A tennis ball with a velocity of +7.6 m/s to the right is thrown perpendicularly at a wall. After striking the wall, the ball rebounds in the opposite direction with a velocity of -5 m/s (to the left). If the ball is in contact with the wall for 0.014 s, what is the average acceleration of the ball while it is in contact with the wall?
A railroad engine weighs three times as much as a freight car. If the engine coasts at 9 km per hour into a freight car that is initially at rest
A long, straight wire carries a current I1=3.8 A and is distance h=17.4 cm from a rectangular current loop that carries a current I2=1.8 A. DETERMINE the force exerted by the current loop on the wire
How many 119W light bulbs can you use in a 134V circuit without tripping a 15 A circuit breaker? (The bulbs are connected in parallel that means that the potential difference across each light bulb is 134 V.)
The displacement of a wave traveling in the positivex-direction is y(x,t)=(3.5cm)cos(2.7x?92t), wherex is in m and t is in s, What is the wavelength of this wave
An engineer wishes to determine the specific heat of a new metal alloy. A 0.150-kg sample of the alloy is heated to 540°C. Calculate the specific heat of the alloy
Suppose a uniformly charged (with a linear charge density) wire starts at point 0 and rises vertically along the positive axis to a length. Determine the x-component of the electric field at point. That is, compute near one end of a long wire, in the..
A 40 kg child sits 1.3 m away from the center of a merry-go-round. If the merry-go-round is traveling with a radial velocity of .78 rad/s, what is the centripetal force on the child
A sperical source ratiates sound uniformly in all directions. At a distance of 18m, the sound intensity level is 100dB. what power is radiated by this source
A hockey player is standing on his skates on a frozen pond when an opposing player, moving with a uniform speed of 4.0 m/s, How long does it take him to catch his opponent
For a record playing at 78 rpm, find the frequency and the angular velocity. Find the Frequency and angular velocity
three particles of mass m = 0.027 kg are fastened to three rods of length d = 0.13 m and negligible mass. determine the rotational inertia of the assembly
What is the time of oscillation of block
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