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In the Bohr model of hydrogen, the electron moves in a circular orbit around the nucleus. Determine the angular speed of the electron, in revolutions per second, when it is in
(a) the ground state and
(b) the n = 7 state.
A Carnot engine works between temperatutes T1 = 495K and T2 = 302K. What is the Carnot coefficient of performance, KC, of the refrigerator
A uniform magnetic field of magnitude 1.00 T is directed perpendicular to the plane of a rectangular loop having dimensions 8.1 cm by 10 cm
must include free body diagrams with applications of newton's 2nd law 1) a 3.0 kg ball is attached to two pieces of string, compute the tension in the upper string
A sound wave travels in air toward the surface of a freshwater lake and enters into the water. What is the wavelength in the water
A mass of 0.006 kg is attached to a spring that requires a force of 0.01 N to extend it 0.05 meters greater than its natural length, Find maximum velocity of spring when released from rest
The spring is then released. If the mass is attached to the spring, explain how far up the slope will the mass move before coming to rest? Express your answer using two significant figures.
The 4 block in the figure is attached to a vertical rod by means of two strings. When the system rotates about the axis of the rod, the strings are extended and the tension in the upper string is 77.
Sketch a free body diagram for the hot air balloon. When the burner is turned on what force is required to cause an upward acceleration of 5m/s squared?
A steel-belted radial automobile tire is inflated to a gauge pressure of 30.0lb/in^2, what is the tire's pressure at the elevated temperature
The length of a simple pendulum is 0.75 m and the mass of the particle (the "bob") at the end of the cable is0.40 kg. What is the angular frequency of the motion
Methane (CH4) is burned with the 20% dry excess air at 227C. Combustion occurs at one atmosphere. Determine the adiabatic flame temperature (C)
Three fire hoses are connected to a fire hydrant. Each hose has a radius of 0.023 m. Find the water speed in each hose
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