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Suppose, you live in a place on the equator. There is a vertical rod of length 2m on your roof top. One morning, you went to the roof top and observed the shadow of the rod. If the length of the rod was 1m, then what time was that?
Light of wavelength 550. nm in air is found to travel at 1.96x10^8 m/s in a certain liquid. Determine the frequency of the light in air
A stereo speaker has a surface area of 0.043 m^2. The acoustic power output of the speaker is 1.7 W. Calculate the intensity of the speaker
Particles called ?-mesons are created by accelerator beams. If these particles travel at 2.80 ? 108 m/s and live 2.60 ? 10-8 s, how long do they live as viewed in the laboratory
A light beam containing red and violet wavelengths is incident on a slab of quartz at an angle of incidence of 25.2°. Find the dispersion of the slab
a severe thunderstorm dumped 2.8 in of rain in 30 min on a town of area 34 km2. what mass of water in kg fell on the
In an X-ray tube electrons strike a tungsten target (W or "wolfram") after being accelerated through a potential difference V0. Estimate the minimum value of V0 required to observe the Kalpha peak.
A block is projected up a frictionless inclined plane with initial speed v0 = 8.50 m/s. The angle of incline is ? = 27.7°. How far up the plane does it go
A point source of light is located 6.6 m below the surface of a large pool of water. Find the area of the largest circle on the pool's surface through which light coming directly from the source can emerge
A factory worker pushes a 30.0kg crate a distance of 4.4 m along a level floor at constant velocity by pushing downward at an angle of 31 below the horizontal. What is the total work done on the crate
When the concave side is used as a mirror, the magnification is +2.9. What is the magnification when the convex side is used as a mirror, the object remaining the same distance from the mirror
An object weighing 340 Newton in air is immersed in water after being tied to a string connected to a balance. The scale now reads 250 Newton, Compute what is the density of the oil
A skier speeds down a smooth ski slope which is at an angle of 22° with the horizontal. What net force is acting on the skier
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