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Platinum has a work purpose of 6.4 eV. Radiation by wavelength 150 nm and intensity 1.3 W/m2 is directed at a platinum surface. (a) Discover the maximum kinetic energy of the ejected electrons. (b) If 1.0% of the photons striking a1.0 cm2 area of platinum eject electrons, how many electrons are emitted per second from that part of the surface?
the eyepiece of a microscope has a focal length of 1.25 cm and the objective lens focal length is 1.49 cm.a if the tube
A skier (m=61.0 kg) starts sliding down from the top of a ski jump with negligible friction and takes off horizontally. Find her total kinetic energy as she reaches the ground
Two small, positively charged spheres have a combined charge of 5.35×10-5 C. If each sphere is repelled from the other by an electrostatic force of 1.00 N
The average density of a fish can be found by first weighingit in air and then finding the apparent weight of the fish as ithangs completely immersed in water
A 50.0g silver spoon at 20.0c is placed in a cup of coffee at 90 c. How much heat does spoon absorb from the coffee to reach a temperature of 89c.
A lifeguard sits on his watchtower at the edge of the pool at a height h=2.0m above the surface of the water. What is the depth of the pool at the location of the watch
What is the Kinetic energy of the Helium atom as it passes the 0 V plate. The mass of the Helium nucleus is 6.64e^-26
A rock is thrown vertically upward with a speed of 11.0m/s from the roof of a building that is 70.0m above the ground, What is the speed of the rock just before it strikes the ground
You hit a golf ball at a 61 degree angle, and it lands 120 m away, and 9 m down in a hole from it's original Y position. Find initial velocity and the maximum height
A 0.1kg ball is attached to a string and whirled around in a circle overhead, What is the maximum speed the ball can have when the radius of corcle is 1m
A small rocket maintains a constant thrust as to produce an acceleration of 2 m/s^2. determine the maximum achieved rocket thrust
A bullet with mass 5.04 g is fired horizontally into a 2.125-kg block attached to a horizontal spring. Find the initial speed of the bullet-block system
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