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A 1400kg wrecking ball hangs from a 20m -long cable. The ball is pulled back until the cable makes an angle of 23.0 with the vertical. By how much has the gravitational potential energy of the ball changed?
a cord is used to vertically lower an initially stationary block of mass m 15 kg at a constant downward acceleration
A compressive force of 2.7×104N is exerted on the end of a 24-cm-long bone of cross-sectional area 3.9cm2. By how much will the bone shorten
A diving board oscillates with simple harmonic motion of frequency 3.23 cycles per second. What is the maximum amplitude with which the end of the board could vibrate in order that a pebble placed there not lose contact with the board during the o..
A woman is reported to have fallen113ft from a building, landing on a metal ventilator box, which she crushed to a depth of25in. Calculate the time it took to crush the box
A skier starts from rest at the top of a hill that is inclined at 10.5? with the horizontal. The hillside is 191 m long, and the coefficient of friction between snow and skis is 0.0677. At the bottom of the hill, the snow is level and the coef..
the 2lb block is given an initial velocity of 20fts when when it is at a. if the spring has an unstretched length of
What power is dissipated in a single light. A proton is fixed in place. An electron is released from rest and allowed to collide with the proton. Then the roles of the proton and electron are interchanged, and same experiment is repeated. Which is ..
a compass needle free to turn in a horizontal plane is placed at the centre of circular coil of 30 turns and radius 12
A simple pendulum consists of a 4kg mass attached to a 3m long rope. At t=0 it is moving to the right at 0.4m/s. What is the angular frequency of the oscillation
a physics professor demonstrates the doppler effect by tying a 600hz sound generator to a 1.0-m-long rop, what are the highest and lowest frequencies heard by a student in the classs room
Acircular hole of radius 8.470×10−1 cm mustbe cut into the front panel of a displayunit. The tolerance is1.0×10−3 cm, which means the actual hole cannot differ by more than this quantity fromthe desired radius.
A car is driven east for a distance of 49 km, then north for 23 km, and then in a direction 28° east of north for 28 km. FIND the magnitude (in km) of the car's total displacement from its starting point
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