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The work function of an element is 3.2 eV. Photons of a certain energy are found to eject electrons with a kinetic energy of 2 eV.
(a) What is the speed of the ejected electrons?
(b) What is the photon frequency?
(c) If the photon energy is increased by a factor of two, what is the kinetic energy of the ejected electrons?
The displacement of a particle moving under uniform acceleration is some function of elapsed time and acceleration. Suppose we write this displacement as: s=ka^mt^n where k is the dimensionless constant.
Skater A, mass 55.0 kg, moving at 14.0 m/s bumps into stationary Skater B, mass 65.0 kg. After the collision, Skater A moves at an angle of 53.1o from her original direction, What are the final speeds of the two skaters
A 50 kg diver has an angular velocity of 6 rad/s about her medial-lateral axis of rotation when she leaves the board in a layout position, what is her radius of gyration in the tuck positions
A horizontal 790-N merry-go-round of radius 1.60 m is started from rest by a constant horizontal force of 55 N applied tangentially to the merry-go-round
A car of mass 1110 kg travels at a speed of 20 ms-1 along a straight road. The driver sees a red traffic light ahead, and applies brakes. The coefficient of friction between the car tyres and the road is 0.83. Take the acceleration due to gravity to ..
Calculate the orbital period of Neptune (in yr) from knowledge of G, the mass of the sun (M = 1.99×1030 kg), and the orbital radius of Neptune of 3.00×101A.U
A copper container of mass 0.300kg contains 2.0 kg of lemonade at 33degree Celsius. What is the final temperature of the lemonade
A Mercedes-Benz 300SL (m = 1750 kg) is parked on a road that rises 10° above the horizontal, What is the static frictional force that the ground exerts on the tires
An 80 kg weightlifter is standing holding a bar weighing 981 N directly over his head. What is the GRF (ground reaction force) acting on the weightlifter's feet
A jogger accelerates from rest to 3.49 m/s in 2.40 s. A car accelerates from 21.0 to 31.8 m/s also in 2.40 s, Find the magnitude of the acceleration of the jogger
A proton with an initial velocity of (1.0x + 2.0y+ 3.0z) xe5 m/s enters an magnetic field of 0.5zT. Find the radius of the resulting helix
What are the speed and period of a person on a carousel if the person has a centripetal acceleration with a magnitude of 1.0 m/s2 when she is standing 3.0 m from the axis
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