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Q. A photoelectric-effect experiment determines a stopping potential of 1.93 eV while light of 200 nm is used to illuminate the cathode.
1) From what metal is the cathode made?
2) What is the stopping potential if the intensity of the light is doubled?
You and a friend each drive 67 km. You travel at 88.1 km/h, your friend at 952.6 km/h. How long would your friend wait for you at the end of the trip.
A student removes a 10.50 kg stereo from a shelf that is 1.802 m high. The amplifier is lowered at a constant speed to a height of 0.75 m. What is the work done by a) person and b) gravitational force that acts on the amplifier.
Objective questions based on kinematics.
The rectangular gate CD shown in the figure is 1.8 m wide and 2 long. Assuming the material of the gate to be homogeneous and neglecting friction at the hinge C, determine weight of the gate necessary to keep it shut until the water level rises to..
A certain freely falling object requires 1.7s to travel the last 37m before it hits the ground. From what height above ground did it fall.
How far does Tinki drive before passing David.
A 10.00kg box on a smooth, frictionless, horizontal surface experiences a downward force of 30n at an angle of 40 degrees to the horizontal. The box moves 1.50 m to the right. What was the work done by gravity.
An inflated rubber balloon is rubbed with the wool cloth until an excess of 1.50 multiplied by 109 electrons is on the balloon. What is the magnitude of the charge on the balloon.
Coherent light that contains two wavelengths, 660 nm and 470 nm, passes by two narrow slits with a separation of 0.280 mm and an interference pattern is observed on a screen which is a distance 4.40 m from the slits.
A 100 kg cannon at rest contains a 10-kg cannon ball. When fired, cannon ball leaved the cannon with a speed of 450 m/s. What is the recoil speed of the cannon.
Two stationary positive point charges, charge 1 of magnitude 3.55 and charge 2 of magnitude 2.00 , are separated by a distance of 30. An electron is released from rest at the point midway between the two charges, and it moves along the line connec..
A person can jump a horizontal distance of 2.82m on Earth, where the free-fall acceleration, g = 9.81 m/s2. How far might the person jump on the moon, where the free-fall acceleration is g/6? How far could the person jump on Mars where the accelerati..
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