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Q1. a rifle recoils while firing a bullet. The speed of the rifle’s recoil is small becauseA. rifle has much more mass than the bulletB. force against the rifle is smaller than against the bulletC. momentum of the rifle is smallerD. momentum is mainly concentrated in the bulletQ2. padded dashboards in cars are safer in an accident that non-padded ones because of occupant hitting the dash hasA. increased time of impactB. decreased impulseC. decreased time of impactD. increased momentumQ3. A 4 kg ball has momentum of 12kg m/s. what is ball’s speed?A. 4m/sB. 3 m/sC. 12 m/sD. 48 m/sE. none of theseQ4. two billiard balls having the same mass and speed roll toward each other. What is their combined momentum after they meet?A. 0B. half the sum of their original momentumsC. twice the sum of their original momentumsD. impossible to determine without additional informationQ5. an astronaut, floating alone in outer space, throws a baseball. If the ball floats away at a speed of 20 meters per second, the astronaut willA. move in the opposite direction, but at a lower speedB. move in the opposite direction at a speed of 20 m/sC. move in the opposite direction but at a higher speedD. not move as stated in any of a the above choices
One mole of nickel (6E23 atoms) has a mass of 54 grams, and its density is 8.9 grams per cubic centimeter. You have a long thin bar of nickel, 2.0 m long, with a square cross section, 0.12 cm on the side.
A jeweller working with a heated 44 g gold ring must lower the ring's temperature to make it safe to handle. If the ring is initially at 94 degrees Celsius, what mass of water at 25 degrees Celsius is necessary to lower the ring's temperature to 35 d..
Keeping a constant speed of 0.6 m/s, a marble of mass 18 g rolls back & forth across a shoebox that is 14 cm high & 2 mm thick. Estimate the probability of its escaping through the wall of the box by quantum tunnelling.
Find out the speed of a 56.7 kg thrill seeker at the bottom of the slide, assume no friction. If the thrill seeker has a speed of 24.1 m/s at the bottom, find out the change in mechanical energy due to friction.
What is angular width of the beam
Compute the density of entropically raised element of air
What is change in electrical potential energy of electron
Find out an angular momentum of the system
In the 1950s, an experimental train that had a mass of 2.30 x 10^4 kg was powered across a level track by a jet engine that produced the thrust of 5.30 x 10^5 N for a distance of 504 m. unless otherwise directed, suppose that air resistance is neglig..
If a car travelling at 63 km/h will skid 18 m when its brakes lock, how far will it skid if it is travelling at 150 km/h while its brakes lock.
A space traveller whose mass is 104kg leaves earth. What are his weight and masson earth and in interplanetary space where there are no near planetary objects.
The 3.3 kg piece of wood slides on the surface. The curved sides are perfectly smooth, but the rough horizontal bottom is 35 m long and has the kinetic friction coefficient of 0.24 with the wood. The piece of wood starts from rest 6.0 m above the rou..
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