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For two stars of the same surface temperature, how does their relative luminosity depend on their radii?
The driver of a car wishes to pass a truck that is travelling at a constant speed of 20 meters per second. Initially, the car is also travelling at 20 meters per second and its front bumper is 24 meters behind truck's rear bumper.
A mining lift, with a 80kg cage, should be able to pull up to the surface ten 90kg miners, from a 20m deep well, in 20s. If the gearboxes available have an efficiency of 75%, what should be the power rating of the DC motor used. If the driving gear p..
Consider a Rankine cycle with water as the working fluid. Superheated vapor enters the turbine at 480°C and 100 bar and exits at 0.06 bar. determine the actual heat removed from the condenser
If the energy that goes into evaporating one kilogram of water from Lake Michigan at 22.0 oC, how high (in m) would it be lifted
Bill can throw a ball vertically at a speed 1.4 times faster than Joe can. How many times higher will Bill's ball go than Joe's
A point charge of 20nC is placed on the x-axis at the point x = 2. Find the x-component of the electric field Ex at x = 4 and x = -1 where the coordinates are in meters
Use the value of the Sun's luminosity (3.90×10^26 watts, or 3.90×10^26 joules per second) to calculate what mass of hydrogen the Sun will convert into helium during its entire main-sequence lifetime of 1.2×10^10 years.
A wheel has an initial angular velocity of (-24rad/s). If it atteins an angular velocity of (3rad/s) in time of 2 min, copmpute the centripetal acceleration
A 1210-N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end.
In the experiment to study polarization, the angle between the transmission axes of two polarizers is theta. Light from the incandescent light source passes through both polarizers. Calculate the value of the angle theta
Fred and Barney are two electric charges that are to begin with held 1 meter apart and experience an electric repulsion of 10 pounds of force. What would be the force of repulsion between them be if the two were moved closer together so that they ..
An industrial flywheel with a moment of inertia of 445kg?m2 rotates with a speed of 6500rpm. How much work is required to bring the flywheel to rest
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