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The top and bottom margins of a poster are 4 cm and the side margins are each 5 cm. If the area of printed material on the poster is fixed at 390 square centimeters, find the dimensions of the poster with the smallest area.
What resistive force (assumed to be constant) does the wood exert on bullet? How long does it take the bullet to come to rest.
Calculae the flow rate ( in grams per second) of blood in the aorta if the flow speed is 42 cm/s.
An 8.m, 220 N uniform ladder rests against a smooth wall. The coefficient of static friction between the ladder and the ground is 0.75, and the ladder makes a 50° angle with the ground. How far up the ladder can an 770 N person climb before the la..
A constant electric field directed upon the positive x axis has a strength of 2000 N/. find the force exerted on the proton by the field
A grating spectrometer is used to resolve third order peaks from two wavelengths of ?1 = 455.00 nm, What is the minimum number of slits this grating must have
An object's true weight is 135N. When it is completely submerged in water, what is the density of the object
If this lens is then immersed in water with a refractive index of 1.33, what will the focal lens of the lens be in this environment
suppose that r2/r1 = 10.0 cm and ignoring any air inside the shell, find the temperature of the outer surface of the shell.
A hot air balloonist rises vertically with a constant velocity of 6.0 m/s and releases a sandbag at the precise instant when the balloon is 40.0 m above the ground. what is the time when the sandbag hits the ground
A 100 ball on a 60 long string is swung in a vertical circle whose center is 200 above the floor. The string suddenly breaks when it is parallel to the ground and the ball is moving upward. The ball reaches a height 600 above the floor.What is the..
An electron ( mass = 9.11×10?31kg ) leaves one end of a TV picture tube with zero initial speed and travels in a straight line to the accelerating grid, If the accelerating force is constant, compute the acceleration of the electron
Two photons have different frequencies f1 and f2 . If the ratio of their momenta is 22.5, what is the ratio of their frequencies
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