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In a simplified model of a hydrogen atom, the electron moves around the proton nucleus in a circular orbit of radius 0.53 × 10^?10 m.
a) Determine the force between the electron and the proton.
b) Determine the radial acceleration of the electron.
c) Determine the speed of the electron.
d) Determine the period of the circular motion.
A ball is thrown straight upward. At 5.50 m above its launch point, the ball's speed is one-half its launch speed. What maximum height above its launch point does the ball attain?
The coefficient of kinetic friction
An ice cube of mass ma and specific heat Ci is initially at temperature T1, where T1 is less than 273K. If L is the latent heat of fusion of water, and the specific heat of water is Cw, how much energy is needed to convert the ice cube to water at ..
What is the electric potential energy of the system.
A bucket filled with dirt of mass 22 kg is suspended by a rope that hangs over a pulley of mass 31kg and radius 0.15 m. everything is at first at rest.
If the bullet leaves the gun at a speed of 280 m/s, by how much will it miss the target? Illustrate at what angle should the gun be aimed so as to hit the target?
An iguana that is slowing down at a uniform rate of acceleration while moving in positive direction.
A drinking straw 20 cm long and 3 mm in diameter stands vertically in a cup of juice 8.0cm in diameter. A section of straw 6.5cm long extends above the juice. A child sucks on the straw, and the level of juice in the glass begins dropping at 0.23c..
What is the magnitude of the net torque exerted on the branch by the children? Suppose that the axis is located where the branch joins the tree trunk and is perpendicular to the plane formed by the branch and the trunk.
An LR circuit is hooked up to a battery as shown in the figure, with the switch initially open. The resistance in the circuit is R=120Ω, the inductance is L=4.10H, and the battery maintains a voltage of E=49V. At time t=0 the switch is closed.
A loudspeaker of mass 19.0 kg is suspended a distance of h = 2.00m below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of l= 3.50m. Illustrate what is the tension T in each of the cables?
A 2.10 sound wave travels through a pregnant woman's abdomen and is reflected from the fetal heart wall of her unborn baby. The heart wall is moving toward sound receiver as the heart beats. The reflected sound is then mixed with the transmitted soun..
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