practice problems

002. A 5651N piano is to be pushed up a 3.81m frictionless plank that makes an angle of 25.1* with the horizontal. Calculate the work done in sliding the piano at a slow constant rate. Answer in units of J. Please see attached.

practice problems for mid-exam

I need help with the ones I circled. this five week summer school physics is fast pace. 001. An ore car of mass 38000kg starts from rest and rolls downhill on tracks for a mine. At the end of the tracks, 12m lower vetically, is a spring with constant 290000N/m. The acceleration of gravity is 9.8m/s^2. Ignore friction. How ...continues

practice problems

I've been working all morning on them need help, I'm not sure they are right. 001. What is the speed of the two objects after the collision if they remain stuck together? Please see attached.

Physics Review

Please assist me with the attached exam review problems, such as: A 0.47kg object connected to a light spring with a spring constant of 18.7 N/m oscillates on a frictionless horizontal surface. The spring is compressed 6cm and released from rest. What is the maximum speed of the mass? Please see attached for complete list ...continues

Calculate Efficiency

A system consisting of a cylinder full of gas, sealed by a piston, is alternately loaded, heated, unloaded and then cooled back to it's original state. If 211.2 Joules of work are done, and if 448.8 J of thermal energy are taken out or lost during cooling and other processes, then what is the efficiency of the system?

Calculating force

What is the average force associated with 100 * 10^6 particles, each of a mass 8.280912E-06 Kg, colliding elastically with a wall at a velocity of 102.1 m/s, with directions randomly distributed in 3 dimensions? Assume that the wall is one of the parallel walls of a cylinder with the walls separated by 3 meters.

Force

A rectangular door with dimensions 5 m by 9.1 m is submerged at a depth of 3 meters in water. How much force is exerted by pressure against the door?

Temperature

A wall has an inside Temperature 149 Celsius and outside temperature 22 Celsius. Its area is 6 m^2 and its uniform thickness is .38m. What is the temperature gradient from inside to outside? If the inside temperature decreased, thereby increasing the temperature difference by a factor of 1.749 what would be the temperature ...continues

Pressure Change

Water is confined to flow in a container in such a way that between two points several centimeters apart and at the same altitude, the velocity of the water changes from 5.4 m/s to 2.5 m/s. If no dissipative forces act on the water what is the change in pressure between the two points?

Pressure through tube

If water flows at 1.5 m/s with pressure 60000N/m^2, through a tube whose radius is .02 m, then what will be the pressure after the tube narrows to radius .01m?