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Q. A wrecking ball (weight = 4800 N) is supported by a boom, which may be assumed to be uniform and has a weight of 3600 N. As support cable runs from the top of the boom to the tractor. The angle between the support cable and the horizontal is 32°, and the angle between the boom and the horizontal is 48°. Find (a) tension in the support cable and (b) magnitude of the force exerted on the lower end of the boom by the hinge at point P.
A massless rod of length 1m has a 2.00 kg mass attached to one end and a 3 kg mass attached to the other. The system rotates about a fixed axis perpendicular to the rod that passes through the rod 30.0 cm from the end with the 3kg mass attached. The ..
A rectangular block of ice 7.00 m on each side and 1.80 m thick floats in sea water. The density of the sea water is 1025 kg/m3. The density of ice is 917 kg/m3. How high does the top of the ice block float above the water level.
For no apparent reason, a poodle is running at a constant speed of 6.00 m/s in a circle with radius 2.9 m. Let v1 be the velocity vector at time t1 , and let V2 be the velocity vector at time t2 . Consider (change in v)=v2-v1 and (change in t)=t2-..
An electron is then fired directly toward the center of the shell, from point P at distance r from the center of the shell (r >> R). What initial speed v0 is needed for the electron to just reach the shell before reversing direction.
A 0.025 kg golf ball moving at 21.0 m/s crashes throughout the window of a house in 2.0 10-4 s. After the crash, ball continues in the same direction with a speed of 10 m/s. assuming the force exerted on the ball by the window was constant, what w..
Find out the change in entropy of the system
A 56.0 kg person jumps from rest off the 9.0 m high tower straight down into the water. Neglect air resistance throughout the descent. She comes to rest 3.40 m under the surface of the water. Find out the magnitude of the average force that the water..
A car of mass 960 travels at a speed of 30 along the straight road. The driver sees a red traffic light ahead, and applies brakes. The coefficient of friction between the car tyres and the road is 0.88. Take the acceleration due to gravity to be 9.80..
Some amusement park rides move you back and forth in the horizontal direction. Why is this motion so much more disturbing to your body than cruising at a high speed in a jet airplane.
A 380-N, uniform, 1.50 m bar is suspended horizontally by two vertical cables at each end. A small object of weight 520 N is placed distance 0.5 m from the cable A. What is the tension in cable A.
What is Rosie's power output. A long, straight wire carries a current of 44 A. The magnetic field produced by this current at a certain point is 8.0 x10-5 T. How far is the point from the wire.
A 23 kg boom of length 6 m is supported by a cable that has a breaking tension of 1200N. The cable is perpendicular to the boom and is attached 4.5m from the pivot. What is the utmost load that can be suspended from the end of the boom.
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