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Q. Fred strikes a steel (γ = 20x1010 and ρ = 7.8x103 kg/m3) train rail with a hammer at a frequency of 2.50Hz and Wilma puts her ear to the rail 1.0 km away.
a) How long after the first strike does Wilma hears the sound?
b) What is the time interval between the successive sound pulses she hears?
A wooden raft has a mass of 45 kg. When empty it floats in water (density 1000 kg/m3) with 68% of its volume submerged. What mass of sand could be put on the raft without it sinking.
Suppose an initial speed of 21.4 m/s, at an angle of 61.10° with respect to the positive x axis. Find the velocity at time t0; enter x component, after that the y component.
Suppose the solenoid filled with a paramagnetic substance such as liquid oxygen. Qualitatively,how will this change your your answer to Part (b)? Will your reply increase, decrease,or remain the same.
Therefore of his observations, Ole Roemer concluded that eclipses of Io by Jupiter were delayed by 22 min throughout a six-month period as the Earth moved from the point in its orbit where it is closest to Jupiter to the diametrically opposite point ..
compute the distance from the central maximum to the first bright region on either side of the central maximum.
What centripetal force does an 80-kg passenger experience when seated 12 m from the center of the Ferris wheel whose angular speed is 0.50 rad/s.
determine the speed of the ball after the ball. A positive charge q is fired by a small hole in the positive plate of a capacitor.
A loudspeaker of mass 20 is suspended a distance of 2 below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of 2.90.
A lighthouse that rises h1 = 43.6 ft above the surface of the water sits on a rocky cliff that extends $d$ = 20.0 ft from its base, as shown in the figure below. A sailor on the deck of a ship sights the top of lighthouse at an angle of $theta$ = 29...
The speed of a sound in a container of hydrogen is 201K is 1220m/s. what would be the speed of sound if the temperature were raised to 405K? suppose that hydrogen behaves like an ideal gas.
Suppose you wish to fabricate a uniform wire out of 2.6 g of copper. If the wire is to have a resistance of R = 0.25 and if all of the copper is to be used, what must be the length of the wire in m and the diameter of the wire in mm.
A 02385 mH inductor has a length that is four times its diameter. If it is wound iwth 10.3 cm^-1 truns per centimeter, what is the length? Answer in units of m.
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