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The cable on an elevator of mass m snaps, and two safety mechanisms come into play. Emergency brakes apply a constant friction force ƒ for the entire drop. Also, at the bottom of the elevator shaft is a vertical cushioning spring (initially uncompressed) having spring constant k. The elevator drops from a distance h above the spring. At the point where the spring is compressed a distance d (before the maximum compression, as the elevator is still dropping), find an expression for the speed.
An ideal monatomic gas expands isothermally from 0.530 m3 to 1.25 m3 at a constant temperature of 670 K. If the initial pressure is 1.20 105 Pa. Find the work done on the gas
Atoms can be cooled using multiple laser beams. In such an experiment, the temperature of sodium atoms can be cooled to 0.1 mK. What is the rms speed of the atoms at this temperature
Starting from its nest, an eagle flies at constant speed for 3.2 min due east, then 4.6 min due north. How long is the eagle in the air
q1. what is the electric potential energy of three equal positive charges of 1.33 microc while they are arranged to
A 150- crate, starting from rest, is pulled across a floor with a constant horizontal force of 360 . For the first 11 the floor is frictionless, and for the next 11 the coefficient of friction is 0.31. Illustrate what is the final speed of the c..
Two equally charged particles are held3.2x10 -3 m apart and then released from rest. determine the mass of the second particle
Suppose that the spring is ideal and that the distance by which the spring is compressed is negligible compared to H.
Three charges are fixed to an x, y coordinate system. A charge of +20 µC is on the y axis at y = +3.0 m, Determine the magnitude and direction of the net electrostatic force on the charge at x= +3.0 m
An object moves uniformly around a circular path of radius 22.0 cm, making one complete revolution every 1.80 s. What is the translational speed of the object
In an electron-beam heater, electrons at rest near a tungsten filament are accelerated toward a metal target at a high electrostatic potential. find the potential difference between the target and the filament
A useful model of a water molecule is sketched in the figure below, with point charges of 5.2 10-20 C at the H sites, What is the total electric potential energy of this model of a water molecule
A hill sled moves from the top of a hill at 1m/s. What is the speed of the sled at the bottom of the hill
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