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Q. A railroad boxcar that has " due east" momentum of 15,000 kgm/sec collides with and couples with a similar boxcar that has "due west" momentum of 20,000 kgm/sec. After the collision, the combination has ( ) kgm/sec total of momentum.
Q. A baseball is seen to pass upward by a window 21 above the street with a vertical speed of 13 . If the ball is thrown from the street, when will it hit the street again?
A 60.0-kg skater begins a spin with an angular speed of 6.0 rad/s. By changing the position of her arms, the skater decreases her moment of inertia by 50%. Find the skater's final angular speed?
A car dealer claims that his product will accelerate at a constant rate from rest to a speed of 200 km/hr in 8s. What estimated distance will the car travel.
What is the childs total mechanical energy. If the speed of the child at the lowest position is 2.00 m/s, what is the change in mechanical energy due to friction.
The loaded cab of an elevator has a mass of 3.7 x 10^3 kg and moves 228 m up the shaft in 21 s at constant speed. At what average rate does the force from the cable do work on the cab.
Electrons which were initially at rest were subjected to a continuous force of 2×10-12 newton along the entire length of two miles (one mile is 1.6 kilometers) and reached speeds very near the speed of light.
The frequency of an opera singer is 450 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer who is running down the road towards the opera singer with a speed 25.0 m/s.
Smaller mammals use proportionately more energy than larger mammals; that is, it takes more energy per gram to power a mouse than a human. A typical mouse has a mass of 20 g and, at rest, needs to consume 3.0 Cal each day for basic body processes.
A 0.100 kg meterstick is supported at its 40 cm mark by a string attached to the ceiling. A 0.700 kg mass hangs vertically from the 5 cm mark.
If the speed of the wave is 10 percent less in the organ than in the medium above, determine the depth of the tumor below the organ's surface.
Estimate the change in COP of your electric food freezer when it is removed from your kitchen to its new location in your basement, which is 8 C° cooler than your kitchen. (Assume that the temperature in the kitchen is 20°C and that the temperature o..
What is the magnitude of displacement
A war-wolf or trebuchet is a device used during the Middle Ages to throw rocks at castles and now sometimes used to fling large vegetables and pianos as a sport. A simple trebuchet.
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