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About the years 214-212 BC, the Greek philosopher and scientist Archimedes is said to have repelled a Roman attack with a "death-ray" concave mirror, using sunlight to set the approaching fleet on fire. Assume an early morning attack from the East, with the Sun directly behind the ships. If the approaching fleet is 500 meters away, what would need to be the radius of curvature of the mirror in order to achieve maximum effect?
Since the heat insulation is not perfect, some heat flows into the freezer at a rate of 60 W. Find the power of the motor that is needed to maintain the temperature in the freezer.
A particle of mass m=5.00 kg is at rest at t=0.00 s. A varying force F(t)=6.00t2-4.00t+3.00 is acting on the particle between t=0 s and t=5 s. Determine the speed v of the particle at t=5 seconds
The large blade of a helicopter is rotating in a horizontalcircle. The length of the blade is 7.64 m, measured from its tip tothe center of the circle. Find the ratio of the centripetalacceleration at the end of the blade to that which exists at apoi..
suppose the insulating qualities of the wall of a house come mainly from a 4.0 inch layer of brick and an r-19 layer of
a golfer hits a shot to a green that is elevated 3.20 m above the point where the ball is struck. the ball leaves the
A centrifuge is a common laboratory instrument that separates components of differing densities in solution. If its initial angular speed was 3890 rpm, find what is the magnitude of its angular deceleration
The electric potential in a certain region is given by the equation V(x,y,z) = 3?x2y3 - 2?x2y4z2, Calculate the magnitude of the electric field at the point (x1,y1,z1) = (-5.0, 2.0, 1.5) m in units of N/C
At a certain point in space there is an electric field E = (0.40 i + 0.60 j) x 1011 N/C. (Items in bold are vectors.) Discover the force on a particle of charge of -3.70 nC when it is placed at the point.
What is magnitude of the electric field
Water is pumped from a lower reservoir to a higher reservoir with a pump that draws 20 kW of electrical power. The free surface of the upper reservoir is 45 m higher than that of the lower reservoir. If the flow rate of water is gauged to be 0.03 m^3..
When a box rests on a round sheet of wood on the ground, it exerts an average pressure p on the wood. bwhat is the new average pressure
Two airplanes leave an airport at the same time. The velocity of the first airplane is 720 m/h at a heading of 12.6 degrees. How far apart are they after 1.8 h
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