Q- A bullet with a mass of 45 g is fired upward through a hole in a table into a block of wood with a mass of 5.2 kg. The bullet lodges in the block and the two rise to a height of 3.1 m above the table.
1. Calculate the potential energy of the block above the table.
Solution Search
. February 2016
Momentum-Energy
Megnetic Effects
Q- An aluminum bar slides without friction along Horizontal metal rails through a vertical magnetic field B. The distance between the rails is l. The switch closes at t=0s, while the bar is at rest, and a battery of emf V, starts a current flowing around the loop. The battery has internal resistan…
Floating
Q- What percentage of an ice cube is under water when it is placed into water? What percentage of an ice cube is submerged when it is placed in a drink that is straight 80 proof whiskey? (80 proof mean that it is 40% alcohol and 60% water.)
(Density of ice ri = 917 kg/m3, density of alcohol rA = …
Buoyancy-Upthrust
A 9.0 kg block of metal is suspended from a scale and immersed in water as in Figure. The dimensions of the block are 12.0 cm *9.0 cm *9.0 cm. The 12.0 cm dimension is vertical, and the top of the block is 5.00 cm below the surface of the water.
- What are the forces exerted by the water on the …
WPE
Q- A cart of mass M1 = 6 kg is attached to a block of mass M2 = 3 kg by a string that passes over a friction-less pulley. The system is initially at rest and the table is friction-less. After the block has fallen a distance h = 1 m. What is the work Ws done on the cart by the string?
Moment-torque-angular Momentum
Q- A uniform stick d = 1 m long with a total mass of 750 g is pivoted at its center by means of a friction-less peg. A 5.6 g bullet is shot through the stick midway between the pivot and one end. It approaches at v0 = 409 m/s and leaves at vf = 260 m/s.
- What is the moment of inertia of the sti…
6 .
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