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Q. A bullet of mass 12 g is fired with an initial speed of 297 m/s into a wooden block that is at first at rest. The bullet becomes lodged in the block, and the two slides together on the floor for a distance of 1.2 m before coming to rest. If the coefficient of friction between the block and the floor is 0.40, what is the mass of the block?
Find out the tension in the rope
A 25000 kg rocket ship accelerates upwards by reason of constant 1.25MH of thrust from its engine. A simple pendulum on the ship is observed to complete 100 full swings in 75 seconds. What is the length of string.
.250 kg ball is dropped to the floor from a height of 1.0 m and upon rebounding, reaches a height of .60 m. What is the impulse delivered to the ball by the floor?
One mole of an ideal gas at 27 °C is expanded isothermally from an initial pressure of 3 atm to a final pressure of 1 atm in two ways. (a) reversible, and (b) against a constant external pressure of 1 atm. find q, w, ΔU, ΔH, ΔSsys, ΔSsurr, ΔStotal..
A point charge q1=4nC is placed at the origin, and a second point charge q2= -3nC is placed on the x-axis at x= 20cm. A third point charge q3=2 nC is to be placed on the x-axis between q1 and q2.
A 747 airliner reaches its takeoff speed of 187 mi/h in 31.4s. What is the magnitude of its average acceleration.
Calculate the magnitude, the direction of resultant force and the coefficient of kinetic friction.
At full power, how long would it take for car to accelerate from 0 to 56 mph? Neglect friction and air resistance.
For the situation, the magnetic field changes with time according to the expression B = (2.00t3 - 4.00t2 + 0.800)T, and r2 = 2R = 5.00 cm. (a) Calculate the magnitude and direction of the force exerted on an electron located at point P2 when t = 2.00..
Find out the frequency of the fourth harmonic if the string is fixed at one end and free at other. (That is, if the free end is attached to a long string of negligible mass.)
Dan is gliding on his skateboard at 4 m/s. He suddenly jumps backward off the skateboard, kicking the skateboard forward at 6 m/s (as measured by an observer on the ground). Dan's mass is 50 kg and the skateboard's mass is 7 kg. How fast is Dan going..
Two long, parallel wires are separated by a distance of 3.40. The force per unit length that each wire exerts on the other is 3.20×10-5, and the wires repel each other. The current in one wire is 0.6690.
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