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1- An elevator cab and its load have a combined mass of 2000kg. 1600kg of this mass belong to the elevator and 400kg belong to the load. What force dose the load exert on the floor of the elevator if the elevator, which is initially moving at a speed of 10m/s, is brought to rest in a distance of 40m?
2- A father racing his son has 2/3 the kinetic energy of the son who has 2/3 the mass of the father. The father increases speed by 1.0m/s and then has the same kinetic energy as the son. What is the origianal speed of the father?
The heating element of a water heater in an apartment building has a maximum power output of 23 kW. what is the maximum possible temperature of the hot water
The polarizability of large atoms can be estimated by using the formula for the polarizability of a metal sphere, \(\alpha = 4\pi\epsilon a^{3}\), Estimate the induced dipole moment of an oxygen atom
A camera uses a biconvex lens made of glass with an index of refraction of 1.60 and has a radius of curvature of 12cm for the 1st surface, What is the focal length of this lens when used in air
A uniform magnetic field is aligned with the axis of a solenoid having a radius of 0.25m. What is the induced emf in the coil
Suppose 145 moles of a monatomic ideal gas undergo an isothermal expansion from 1.00m^3 to 4,00 m^3, How much work is done by the gas during this expansion
Find the probability that the electron will tunnel through the barrier.
The internal energy of a system changes becasue the system gains 176 J of heat and performs 312 J of work. During this return process, what work is involved
When at rest, two trains have sirens that emit a frequency of 300 Hz. The trains travel toward one another and toward an observer stationed between them. What is the speed of the second train
A moon orbits a planet of unknown mass with a period of 1.8 days. If the radius of the moon's orbit is 420,000,000 meters, find the mass of the planet
When a certain air-?lled parallel-plate capacitor is connected across a battery, it acqquires a charge (on each plate) of magnitude 131 µC. What is the dielectric constant of the slab
A 3.00 kg block starts from rest at the top of a 29.0 degree incline and slides 2.00 m down the incline in 1.65 s. Find the frictional force acting on the block
The semiconducting compound InAs is widely used for infrared light emitting diodes (LED's). What is the frequency of light emitted by a InAs LED
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