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A 46-kg skater is standing still in front of a wall. By pushing against the wall she propels her-self backward with a velocity of -1.2m/s. Her hands are in contact with the wall for 0.80 s. Ignore wind resistance and friction. Determine direction and magnitude of the average force she exerts on the wall.
We can roughly model a gymnastic tumbler as a uniform solid cylinder of mass 72.0kg and diameter 1.20m. What percent of his total kinetic energy is rotational
A sled and its rider are moving at a speed of 4.0 m/s along a horizontal stretch of snow. The snow exerts a kinetic frictional force on the run ner of the sled, what is the displacement of the sled
Suppose a 31.7 kg child sits 1.38 m to the left of center on the same seesaw as the problem you just solved. Find the normal force acting at the pivot point
At time 0 a grinding wheel has an angular velocity of 30. It has a constant angular acceleration of 35 until a circuit breaker trips at time = 2.20. From then on, wheel turns through an angle of 428 as it coasts to a stop at a constant angular dec..
A ship's anchor weighs 5000 N. Its cable passes over a roller of negligible mass and is wound around a hollow cylindrical drum of mass 380kg and radius 1.10m. The drum is mounted on a frictionless axle. The anchor is released and drops 16 m to water.
A parallel plate capacitor has a charge of 2.66 X 10^-11 C after being charged by a 15.0 V battery. The plates are seperated by 2.00 mm of air
What is the surface temperature of Betelgeuse, a red giant star in the constellation of Orion, which radiates with a peak wavelength of about 970 nm?
An open organ pipe and an organ pipe that is closed at one end both have langths of .52 m at 20 degrees celsius. What is the fundamental frequency of each pipe in hertz
assume the following parameters: Mass of the bottom steel disc: 1.4678 kg Mass of the upper steel disc: 1.4795 kg Mass of the upper aluminum disc: 0.4614 kg Radius of each disc: 63.3 mm Radius of the take-up spool: r = 125 cm Mass of the falling w..
question a collapsible plastic bag contains a glucose solution.if the average gauge pressure in the vein is 13900 pa
An athlete grips a light rope that passes over a low-friction pulley attached to the ceiling of a gym. A sack of sand precisely equal in weight to the athlete is tied to the other end of the rope. The athlete climbs the rope, sometimes speeding up an..
The weight of passengers on a roller coaster increases by 57 as the car goes through a dip with a 39 radius of curvature. What is the car's speed at the bottom of the dip
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