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work function of potassium is 2.225 eV.
a) Find the cutoff wave length of potassium
b) If the maximum energy of teh photoelectron due to some x-ray, form the surface of potassium is 1.2 eV, find the frequency of the x-ray.
A car of mass 1450 kg traveling at 26 m/s is at the foot of a hill that rises 140 m in 2.4 km. Find the average power delivered by the car's engine
Using Newton's laws, Evaluate the magnitude of the normal force that the floor exerts on the chair.
Neutron stars consist only of neutrons and have unbelievably high densities. Find the density of such a star
A blue car with mass mc = 428 kg is moving east with a speed of vc = 20 m/s and collides with a purple truck with mass mt = 1284 kg, What is the magnitude of the initial momentum of the car
A gun shoots bullets that leave the muzzle with a speed of 336 m/s. If a bullet is to hit a target 136 m away at the level of the muzzle, the gun has to be aimed at a point above the target. How far above the target is this point.
Two cylindrical rods are identical, except that one has a thermal conductivity k1 and the other has a thermal conductivity k2. they are placed between two walls that are maintained at different temperatures TW (warmer) and TC (cooler).
How much work is needed to move it at constant speed.
A 5g bullet leaves the muzzle of a rifle with a speed of 320 m/s. What force (assumed constant) is exerted on the bullet while it is traveling down the 0.81 m long barrel of rifle.
A jet airplane is in level flight. The mass of the airplane is m = 8950 kg. What is the magnitude of the lift force acting on the plane
For the circuit in the figure (Figure 1) , R = 300? ,L = 0.860H and C = 5.00?F . When the source is operated at the resonance frequency, Determine the current amplitude through the resistor
What is the final speed of the crate after being pulled. On a very muddy football field, a 100 linebacker tackles an 80 halfback. Immediately before the collision, linebacker is slipping with a velocity of 8.5 north and the halfback is sliding with..
A crate of potatoes of mass 8.0 kg is on a ramp with angle of incline 30° to the horizontal. The coefficients of friction are μs = 0.72 and μk = 0.43. Find the frictional force (magnitude and direction) on the crate if the crate is sliding up t..
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