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A) In the Bohr's model of the hydrogen atom, the electron moves in a circular orbit of radius 4.713 × 10-11 m around the proton. Assume that the orbital angular momentum of the electron is equal to h. Calculate the orbital speed of the electron. Answer in units of m/s.
B) Calculate the angular frequency of the electron's motion. Answer in units of s-1.
A 4.90-kg ball, moving to the right at a velocity of +1.75 m/s on a frictionless table, collides head-on with a stationary 7.05-kg ball. Find the final velocities of the balls if the collision meets Completely inelastic
A cat rides a merry-go-round while turning with uniform circular motion. At time t1 = 2.00 s, the cat's velocity is v1 = (3.50) + (4.00 m/s), find the magnitude of the cat's centripetal acceleration
An aluminum rod is 23.0 cm long at 20°C and has a mass of 350 g. If 15000 J of energy is added to the rod by heat, what is the change in length of the rod
Two resistors of values 6 and 12 ohms are connected in parallel. This combination in turn is hooked in series with a 4 ohm resistor. Find the overall resistance of this combination
A ball is dropped from somewhere above a window that is 1.50 m in height. From what height above the window was the ball dropped
A spaceship is on a straight-line path between the Earth and the Moon. At what distance from (the centre of) Earth is the net gravitational pull on the probe from the Earth and the moon zero?
A 20-cm-radius ball is uniformly charged to 75nC. What is the ball's uniform charge density
Explain the physical processes by which astronomers are able to estimate the temperature of a gas by observing which spectral lines are present in its spectrum and measuring the relative strength of the lines. This process is known as Balmer thermome..
A point charge q1=15.00 µC is held fixed in space. What is the acceleration of the sphere at the instant when its speed is 24.0m/s
Two resistors, 50.0 ? and 52.0 ?, are connected in parallel. The current through the second resistor is 2.10 A. What is the total power supplied to the two resistors
A charge+ q is located at the origin, while anidentical charge is located on the x axisat x = + 0.50 m. A third charge of +2 q is located on the xaxis at such a place that the net electrostatic force on the charge at the origin doubles, its direct..
The A string of a violin is 32cm long between fixed points with a fundamental frequency of 440Hz and a mass per unit length of 6.5×10-4 kg/m. What is the wave speed in string.
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