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A ball is released from the bottom of an elevator which is traveling upward with a velocity of 6 ft/s . If the ball strikes the bottom of the elevator shaft in 3 s, determine the height of the elevator from the bottom of the shaft at theinstant the ball is released. Also, find the velocity of the ball when it strikes the bottom of the shaft.
a horizontal circular platform m 96.1 kg r 3.03m rotates about a frictionless vertical axle. a student m 79.3kg
Two very small objects, whose charges are +1.0 and -1.0 C, Find the magnitude of the attractive force that either charge exerts on the other
Two 10-cm-diameter charged rings face each other, 21.0cm apart. Both rings are charged to + 50.0nC. What is the electric field strength at the midpoint between the two rings
A 135 mCi radioactive tracer is made in a nuclear reactor. When it is delivered to a hospital 18 hours later its activity is 85 mCi. The lowest usable level of activity is 10 mCi. What is the tracer's half-life
The transverse displacement (y) of a wave is given as a function of position (x in meters) and time (t in seconds) by the expression to the right. Determine the wavelength, frequency, period, and phase constant of this waveform.
Susie is out fishing on a calm, sunny day. She hooks an old tire that is resting on the lake bottom, and hauls it into her boat
A husband and wife take turns pulling their child in a wagon along a horizontal sidewalk. Each exerts a constant force and pulls the wagon through the same displacement. What is the magnitude of the pulling force exerted by his wife
The shaft of a pump starts from rest and has an angular acceleration of 3.00 rad/s2 for 15.0 s. What is the angle through which the shaft has turned
A senior citizen walks 0.36km in 12min, going around a shopping mall. What is her average speed in meters per second
what is the ratio of the amplitude of the damped oscillations. You shoot a 58-g pebble straight up with a catapult whose spring constant is 310 N/m. The catapult is initially stretched by 0.20 m. How high above the starting point does the pebble f..
A coil has 345 turns and self-inductance 3.60 mH. The current in the coil varies with time according to i = (680 mA) cos(?t/0.0250 s)
A converging lens with a focal length of 89.0cm forms an image of a 3.25cm -tall real object that is to the left of the lens. Where are the object and image located in relation to the lens
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