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Q. A sonar generator on a submarine produces periodic ultrasonic waves at a frequency of 2 MHz. The wavelength of the waves in seawater is 4.80 x10-4 m. While the generator is directed downward, an echo reflected from the ocean floor is received 10s later. How deep is the ocean at that point? (Assume that wavelength is constant at all depths.)
It collides with a 10,000 kg railway car resting at the bottom of the track with its brakes off. The two cars couple together and roll up the track to a height of h. find out h.
What was the initial speed of the arrow. A block with mass m = 19.7 kg slides down an inclined plane of slope angle 35.8 deg with a constant velocity. It is then projected up the similar plane with an initial speed 1.05 m/s. How far up the incline w..
If a disco disk is rotating with a person on it on the outer side, then if he moves inside (towards the center), the angular velocity will change-How will the energy be conserved.
A worker pushes a 34 kg block 13m along a level floor at constant speed with a force directed 38° below the horizontal. If the coefficient of kinetic friction between block and floor was 0.19.
A ball on the porch rolls 60 {rm cm} to the porch's edge, drops 40 {rm cm}, continues rolling on the grass, and eventually stops 80 {rm cm} from the porch's edge.
A thin, light wire is wrapped around the rim of a wheel. The wheel rotates without friction about a stationary horizontal axis that passes through the center of the wheel. The wheel is a uniform disk with radius 0.28. An object of mass 4.0 is suspend..
A converging lens has a focal length of f = 29 cm. If an object is placed 40 cm from the lens, where will the image be formed.
A steel aircraft carrier is 364m long when moving through the icy North Atlantic at a temperature of 2.4°C. By how much does the carrier lengthen as it is traveling in the warm Mediterranean Sea at a temperature of 21° C.
Assume unpolarized light of intensity 197 W/m2 falls on the polarizer in the figure, and the angle in the drawing is 37.0°. What is the light intensity reaching the photocell?
A block with mass m = 15kg rests on a frictionless table and is accelerated by a spring with spring constant k = 4234N/m after being compressed the distance x1 = 0.536m from the spring's unstretched length. The floor is frictionless except for a roug..
A uniform magnetic field B is confined to the square region with side of length 2L.
Assume 3 mol of neon (an ideal monatomic gas) at STP is compressed slowly and isothermally to 0.25 the original volume. The gas is then allowed to expand quickly and adiabatically back to its original volume.
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