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Neutral hydrogen can be modeled as a positive charge of 1.6 x 10 ^-19 (the proton) surrounded by a spherically symmetric distribution of negative charge having a volume charge density ρ=A x e^(-2r/ao) where ao =5.3 x 10^-11 meter and is called the Bohr radius. The constant A is chosen such that the total amount of negative charge is -1.6 x 10^-19. Compute the value of the constant A with proper units. Find the net amount of charge inside a sphere of radius ao. Compute the electric field at a distance of ao from the nucleus.
the pressure increases by 1.0 x 104 nm2 for every meter of depth beneath the surface of the ocean. at what depth does
Standing waves are set up on two strings fixed at each end, as shown in the drawing. The two strings have the same tension and mass per unit length, but they differ in length by 0.51 cm. The waves on the shorter string propagate with a speed of 41.3 ..
A 2.00 meter long horizontal plank whose mass is 3.00 kg is placed so that the very end (the right end) rests on a retaining wall. Find the force acting on the board by the retaining wall
In the absence of air resistance, a ballplayer tosses a ball straight up. By how much does the speed of the ball decrease each second while it is ascending
A small electric immersion heater is utilized to heat 110 g of water for a cup of instant coffee. The heater is labeled "200 watts", which means that it converts electrical energy to thermal energy at this rate. Compute the time needed to bring this ..
An electron of mass 9.11x10^-31 kg has an initial speed of 3.00x10^5 m/s. It travels in a straight line, and its speed increases to 7.00x10^5 m/s in a distance of 5.00cm. Assuming its acceleration is constant:
A Styrofoam slab has thickness h and densityρs. When a swimmer of mass m isresting on it, Find the area of the slab
An elevator is able to raise 9,800 N to a height of 27 m in 20 s. What is the elevator's power output
question a 15 g rifle bullet traveling 240 ms buries itself in a 3.9 kg pendulum hanging on a 2.9 m long string which
Jim's dog Sparky runs 45.0m northeast to a tree, then 65.0m west to a second tree, and finally 25.0m south to a third tree. Calculate the direction of Sparky's net displacement
a rocket is fired at a speed of 72.0 ms from ground level at an angle of 50.0 deg above the horizontal. the rocket is
A liquid flows through a horizontal pipewhose inner radius is 2.52 cm. What must the volume flux be if the pressurein the two pipes is the same
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