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A submerged butterfly valve: A vertically oriented circular butterfly valve 2m in diameter has a horizontal axis passing through its center. The center is 5m below the surface of the water in an open tank. What torque is necessary to overcome the hydrostatic pressure holding the valve closed? Neglect friction in the hinge
A mode-locked, titanium-sapphire laser has a wavelength of 850 nm and produces 100 million pulses of light each second. What is the average power produced by the laser
Discuss the ease or difficulty of measuring such a distance. (Select all that apply.) This distance is easily measured using a microscope. This distance is easily measured using a magnifying glass.
An X-ray photon with a wavelength of 0.260nm scatters from a free electron at rest. Find the initial momentum of the photon
Lets say you have a helicopter with 3 blades and eachblade is 5.20 m long and has a mass of 220 kg.The rotor is rotating at 325 rpm. What is the rotationalinertia of the rotor assembly about the axis of rotation?
A ball is thrown horizontally with the speed of 15 m/s from the top of a building. It takes the ball 5 s to land on the ground. What is the speed of the ball when it hits the ground
rotates to provide an "artificial gravity" of 3.10 m/s2 for persons who walk around on the inner wall of the outer rim. Find out the rate of the wheel's rotation in revolutions per minute that will produce this effect.
The coefficient of kinetic friction between her skis and the snow.
A 3.28 kg object initially moving in the positive x-direction with a velocity of +4.87 m/s. Find the final components of velocity of the composite object.
A 100 arrow is shot vertically from a bow whose efficient spring constant is 500. If the bow is drawn 75 before shooting the arrow, to what height does the arrow rise .
Your radio station needs a new coaxial cable to connect the transmitter and antenna. One possible cable consists of a 2.0mm diameter inner conductor and an outer conductor with diameter 1.6cm and negligible thickness (see the figure); the maximum saf..
An 11g bullet is fired into an 11kg wood block that is at rest on the wood table. The block, with the bullet embedded, slides 5.11 across the table. The coefficient of kinetic friction for wood sliding on wood is 0.25.
a star of mass 10 msun is composed entirely of fully ionized 12c.a what is the mean molecular weight ??b suppose that
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