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Q. Use the Bohr theory to find the energy necessary to remove the electron from a hydrogen atom initially in the excited state with n = 2.
Q. A circular hole in an aluminum plate is 3.263 cm in diameter at 0.000°C. What is its diameter (in cm) when the temperature of the plate is raised to 129.8°C? Give your answer to four significant figures. The linear expansion coefficient of aluminum is 23.00 x 10-6 /C°.
A hunter aims directly at a target (on the same level) 84.2m. If the bullet leaves the gun at a speed of 193 m/s, by how much will it miss the target.
A 2.47 kg steel ball strikes a massive wall at 11.7 m/s at an angle of alpha = 67.2° with the plane of the wall. It bounces off with the same speed and angle. If the ball is in contact with the wall for 0.218 s, what is the magnitude of average force..
An ore car of mass 4 000kg rolls downhill on tracks from a mine. At the end of the tracks, 10 m lower in elevation, is a spring with k = 400 000 N/m. How much is spring compressed in stopping the ore car? Ignore friction.
Assume that light of wavelength 550 nm is being observed. Also suppose that diffraction effects, rather than atmospheric turbulence, limit the resolving power of the telescope. Find the greatest distance that these stars might be from the earth.
Dan is gliding on his skateboard at 2.0 m/s. He suddenly jumps backward off the skateboard, kicking the skateboard forward at 8.0 m/s. How fast is Dan going as his feet hit the ground? Dan's mass is 60 kg and the skateboard's mass is 5.0 kg.
Needing help, secretary of the United States Department of Agriculture asked your teacher, "If a chicken and a half can lay an egg and a half in a day and a half, how many days will it takes three chickens to lay twenty eggs".
A space vehicle is coasting at a constant velocity of 28.5 m/s in the +y direction relative to a space station. The pilot of the vehicle fires a RCS (reaction control system) thruster, which causes it to accelerate at 0.523 m/s2 in the +x direction.
What is an approximate absorbed dose rate in Gy per day in water at the center of the bucket if 163 atoms of Cs-137 disintegrate per g s? Use the straight-ahead approximation and mean-radius method of calculating the photon dose. Give the answers for..
What would be the radius of curvature of the cornea
The pilot of an aircraft wishes to fly due west in a 30.50 km/h wind blowing toward the south. The speed of the aircraft in the absence of a wind is 190km/h. What should its speed relative to the ground be.
What is the total mass of the reagents used in the combustion throughout the 30 days . The ball makes 17 oscillations in 16 seconds. What is it the mass of the ball.
What is magnitude of the runner total displacement
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