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He+ is a helum atom with one electron missing. Treating this like a hydrogen arom, what is the first excited state of this atom?
A rifle with a weight of 30 N fires a 5.0-g bullet with a speed of 300 m/s. If a 700-N man holds the rifle firmly against his shoulder, find the recoil speed of the man and rifle
What is the speed of the block while the spring is till now compressed by xf=0.14m.
Two negative, equally charged drops of water, 0.80 mm apart, exert an electrostatic force of 78.5 x 10-9 N on each other. Determine the net charge on each drop. Give your answer in the form "a.bc" pico-Coulombs.
A container is filled to a depth of 19.0 cm with water. On top of the water floats a 32.0-cm-thick layer of oil with specific gravity0.600
A sphere with mass 0.3 kg and radius 0.05 cm is rolling without slipping along a horizontal surface at a speed of 10 m/s. What height does the sphere come to rest
An electron is accelerated by a constant electric field of magnitude 325 N/C. (a) Find the acceleration of the electron. m/s2 (b) Use the equations of motion with constant acceleration to find the electron's speed after 9.00 10-9 s, assuming it st..
After the collision (assumed elastic), the second ball is moving along the positive y axis. Elucidate the final direction of the first ball, and what are their two speeds?
The springs of a 1500kg car compress 5.00mm when its 68 kg driver gets into the driver seat. A 100 kg passenger then gets into the car. Find the total compression of the spring
A spring loaded toy is used to shoot a 3g ping pong ball straight up against air. What is the work done by air resistance
A very long solenoid with a circular cross section and radius r= 8.1cm with n= 1.90E+4 turns/m has a magnetic energy density uB= 5.70 mJ/m3. What is the current in solenoid.
A classroom demonstration is done with an Atwood machine. The masses are m1 = 1.0 kg and m2 = 1.10 kg. what is the acceleration of gravity at that place
Santa loses his footing and slides down a frictionless, snowy roof that is tilted at an angle of 30.0â. what is his speed as he leaves the roof
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