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While running, a man dissipates about 0.502 Joule of mechanical energy per step per kilogram of body mass. If a 55.7 kilogram runner dissipates a power of 69.9 Watt during a race, determine how fast is the man running? Assume a running step is 1.50 meter in length.
Suppose a 7.1 eV electron and a 9.77 eV positron collide, Find the frequency of these new photons
Electrons are ejected from a certain metallic surface with speeds ranging up to 4.2 105 m/s when light with a wavelength of ? = 615 nm is used. What is the work function of the metal?
A disk-shaped merry-go-round of radius2.63 m and mass 135 kg rotates freely with an angualr speed of .621rev/s. What is the final angular speed of the merry-go-round
Two traveling sine waves, identical except for a phase difference of phi, What is the phase difference between the two waves
A sample of ethyl alcohol (C2H5OH) has a density of 806 kg/m3 and a volume of 1.73 x 10-3 m3. find the number of molecules in the sample
At normal incidence, the intensity of sunlight at the Earth is 1400 W/m2. What is the force on the Earth due to radiation pressure from the Sun
a rocket is launched vertically up with no initial velocity. propulsion is provided by the ejection of mass with
Green light of a wavelength 550 nm enter a piece of glass that hasindex of refraction n = 1.5. what is the wavelength of the light in air
A dolphin at Seaworld is to jump through a hoop held in the air by a trainer, At what speed did the dolphin leave the water
At rush hour, the noise from a highway is 10?4 W/m2 with 100 cars passing a given point a minute. At night the average noise is reduced to 10?6 W/m2. How many cars are now driving on the highway?
A 0.527 kg metal cylinder is placed inside the top of a plastic tube, the lower end of which is sealed off by an adjustable plunger, what is the initial acceleration of the metal cylinder
Some species use echolocation to determine the position and velocity of objects and prey. What is the sound frequency of the echo the bat hears
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