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A bowling ball (I=(2/5)mr2) is rolling up a track without slipping. At the top of the 1.2 meter high bump, its velocity is 4.5 meter per second. Determine the balls velocity when it is 2.6 meter above the ground?
what force is needed to pull a 150 pound sled along a horizontal surface? The coeficient of kinetic friction is 0.10 and the sled is pulled by a rope that makes the angle of 0 degree with the horizontal. There is no acceleration.
the cable on an elevator of mass m snaps and two safety mechanisms come into play. emergency brakes apply a constant
The rubidium isotope 87 Rb is a ? emitter with a half life of 4.9 × 10^10 y that decays into 87 Sr. It is used to determine the age of rocks and fossils. calculate the age of these fossils
What is the charge on the drop. A 13 kg child on a playground swing moves with a speed of 3.6 m/s when the 6.0 m long swing is at its lowest point. What is the angle that swing makes with the vertical when the child is at the highest point.
After a snow storm, the roof on one house, H1, isuniformly covered by snow, whereas at the house next door, H2, the snow has completely melted off. A likely reason for this is:
As you sing in the shower, you notice that certain frequencies reverberate with setting up standing waves. If the shower is 5.8 feet long and the speed of sound is 1000 ft/sec, what are the two lowest frequencies that reverberate so?
Using the elbow joint as the axis of rotation, determine the magnitude of the net torque acting about the elbow due to the forearm, hand, and ball
The current density inside a long, solid, cylindrical wire of radius a is in the direction of the central axis and its magnitude varies with radial distance r from the axis according to J = br2, where b is a positive constant.
A 200kg shell is fired from a gun with an initial velocity of200meter/second. what is the potential energy of the shell at the highest point in its trajectory
A catapult launches a test rocket vertically upward from a well, giving the rocket an initial speed of 80.8 m/s at ground level. What is its maximum altitude
Two charges are separated by a distance d and exert mutual attractive forces F on each other. what are the new mutual forces
An explosion of a 10.0-kg bomb releases only two separate pieces the bomb was initially at rest and a 4.00-kg piece travels westward at 100 m/s immediately after the explosion. What are the speed and direction of the other piece
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