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Assume that a tunnel is dug across the earth(radius R) passing through its center. Find the time a particle takes to cover the length of the tunnel if
a) it is projected into the tunnel with a velocity (gR)^1/2
b) it is released from a height R above the tunnel
c) it is thrown vertically upward along the length of the tunnel with a speed (gR)^1/2
What is the maximum energy that a free electron (initiallystationary) can acquire in a collision with a photon of energy 4keV?
Consider a gas of hydrogen atoms...At what temperature will an equal number of atoms have electrons in the ground (n=1) state and in the second (n=3) excited state?
An iceboat is gliding on a frozen lake with no propulsive force being applied. Does the horizontal momentum of the boat Change
Three capacitors having capacitances of 8.3\mu F , 8.8\mu F , and 4.0\mu F are connected in series across a 38-{\rm V} potential difference. What is the total energy stored in all three capacitors
A string passes over a frictionless, mass less pulley attached to the ceiling. A mass m1 = 15.0 kg hangs from one end of this string, and a second mass less, frictionless pulley hangs from the other end. A second string passes over the second pulley ..
A charge of 1.71 mC is placed at each corner of a square 0.170 m on a side. Determine the direction of the force on each charge
A 0.60kg sphere rotates around a vertical shaft supported by 2 strings. If the tension in the upper string is 18N, calculate the tension in the lower string
Light-rail passenger trains that provide transportation within and between cities speed up and slow down with a nearly constant (and quite modest) acceleration. What is the final speed
A lumberjack (m= 98 kg) is standing at rest on one end of afloating log (m= 230 kg) that is also at rest. Determine the velocity of the second log if the lumberjackcomes to rest on it
A teenager pushes tangentially on a small hand-driven merry-go-round and is able to accelerate it from rest to a frequency of 12 rpm in 10.0 s. What force is required at the edge
A small button placed on a horizontal rotating platform withdiameter 0.310 m will revolve with theplatform when it is brought up to a speed of 35.0 rev/min, provided the button is no more than0.128 m from the axis.
As observed from Earth, the wavelength of Hβ in the spectrum of the star Megrez in the Big Dipper is 486.112 nm. Laboratory measurements demonstrate that the normal wavelength of this spectral line is 486.133 nm. Is the star coming toward us or mo..
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