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An astronaut in space cannot use a scale or balance to weigh objects because there is no gravity. But she does have devices to measure distance and time accurately. She knows her own mass is 87.2 kg, but she is unsure of the mass of a large gas canister in the airless rocket. When this canister is approaching her at 3.80 m/s , she pushes against it, which slows it down to 1.20 m/s(but does not reverse it) and gives her a speed of 2.00m/s .
a) What is the mass of this canister?
b) How much kinetic energy is "lost" in this collision?
The two cylinders both have a radius of 1mm. Material 1 has a conductivity of 1.2 x10^4 S/m and material 2 has a conductivity of 1.4 x 10^4 S/m. Piece 1 is 6cm long and piece 2 is 8cm long.
A car travels a distance of 280 m by accelerating from rest at 2.00 m/s2 for 7.00 s and then coasting at constant speed the rest of the way. How long does the trip take
The balance wheel of a watch oscillates with an angular amplitude of n-rad and a period of 0.10 s. Find the maximum angular speed of the wheel
A 1750-kg car experiences a combined force of air resistance and friction that has the same magnitude whether the car goes up or down a hill at 24 m/s. At what angle is the hill inclined above the horizontal
Starting from rest, a 92-kg firefighter slides down a fire pole. The average frictional force everted on him by the pole has a magnitude of 840 N, How far did he slide down the pole
A ball is thrown horizontally off the top of a building with a height of h=22.5m. What is the horizontal distance the ball travels before it hits the ground
An x-ray tube is operated at 45000 V. Find the minimum wavelength of the radiation emitted by this tube
a 15kg child stroller is moving towards you with a speed of 2.5m/s. how much work is required to stop the stroller
A 500-kg package slides 1.50 m down a long ramp that is inclined at 24.0 degree below the horizontal. The coeficient of kinetic friction between the package and the ramp is uk+0.310.
A 220 g block is attached to a horizontal spring and executes simple harmonic motion with a period of 0.150 s. If the total energy of the system is 3.50 J.
A motorboat traveling on a straight course slows uniformly from 60 km/h to 40 km/h in a distance of 50 m. What is the boat's acceleration
The record distance in the sport of throwing cowpats is 81.1 m. This record toss was set by Steve Urner of the United States in 1981, Determine the initial speed of the projectile
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