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In the Bohr model of the hydrogen atom, an electron moves in a circular path around a proton. The speed of the electron is approximately 2.51 106 m/s.
(a) Find the force acting on the electron as it revolves in a circular orbit of radius 5.28 10-11 m.
magnitude ___ N
direction _____
(b) Find the centripetal acceleration of the electron.
magnitude ___ m/s2
direction ___
A 28.0-kg block is connected to an empty 2.46-kgbucket by a cord running over a frictionless pulley. Calculate the mass of sand added to the bucket
a powerful laser pulse cannon fires that is firing lasers. each laser pulse lasts 6.66 micro seconds. what is the average intensity of the laser
A white billiard ball with mass mw = 1.3 kg is moving directly to the right with a speed of v = 3.42 m/s and collides elastically with a black billiard ball with the same mass mb = 1.3 kg, What is the final speed of the white ball
An Australian emu is running due east in a straight line at a speed of 17.5 m/s and slows down to a speed of 12.2 m/s in 4.1 s. (a) What is the direction of the bird's acceleration? (b) Assuming that the acceleration remains the same, what is the ..
When ultraviolent light with a wavelength of 262nm falls upon a clean metal surface, What is the photoelectic threshold wavelength for this metal
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A common flashlight bulb is rated at 0.300 A and 2.80 V (the values of the current and voltage under operating conditions). what is the temperature of the filament when the bulb is on
Ask a A projectile is fired with an initial speed of 66.4m/sat an angle of 37.6? above the horizontal on a long flat firing range. Determine the direction of the projectile 1.32s after firing
A figure skater is spinning with an angular velocity of +13 rad/s. She then comes to a stop over a brief period of time. Determine the time during which she comes to rest
A person, with his ear to the ground, sees a huge stone strike the concrete pavement. A moment later two sounds are heard from the impact: one travels in the air and the other in the concrete, and they are 6.60s apart. How far away did the impact ..
The slit spacing is 0.20nm and the wavelength of the light is 600nm. What is the distance from the slits to the screen
An electron moving in one dimension is confined between two walls seperated by a distance L = 10^-10 m. What is the average force that the electron exerts on the walls
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