What should be the focal length of a lens
A woman can read the newspaper if it is held no closer than 57.2 cm from teh eye. What should the focal length of a lens be if she wants to read at a more comfortable distnace of 23.8 cm
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A large flywheel weighs 3000 kg and has a radius of gyration of 1 m. It is observed that 10 min is required for the flywheel to coast to rest from an angular velocity of 300 rad/s.
The water pressure in the mains of a city at a particular location is 350kPa gage. Determine if this main can serve water to neighborhoods that are 50m above this location.
An inventor claims to have devised a power cycle exploiting this situation that has a thermal efficiency of 14%. Evaluate this claim.
If the pipe is placed in a 50 mi/hr crosswind (wind direction perpendicular to the axis of the cylinder), calculate the Reynolds number for the flow of air over the outside of the cylinder (using properties of air)
The resonant speed is determined experimentally to be 1200 rpm and the corresponding amplitute of the main mass of the machine is 12.7 mm. Determine the amplitude for a speed of 2400 rpm.
Calculate the speed of the flow at the nozzle exit and the force required to hold the nozzle stationary. Neglect weight.
Point charges q1, q2, and q3 are fixed at the vertices of an equilateral triangle whose sides are 2.40 m long. Find the electrostatic potential energy of this system of charges for the following charge values.
What is the velocity of water at the nozzle outlet? Assume viscous effects are negligible and the elevation change between the nozzle inlet and outlet is negligible.
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