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Q. Gold, that has a mass of 19.32g for each cubic centimeter of volume, is the most ductile metal and can be pressed into the thin leaf or drawn out into a long fiber.
(a) If a sample of gold, with a mass of 49.73g, is pressed into a leaf of 1.8µm thickness, what is the area of leaf?
(b) If, instead, the gold is drawn out into a cylindrical fiber of radius 1.5µm, what is the length of fiber?
35 kg girl is bouncing on a trampoline. Throughout a certain interval after leaving the surface of the trampoline, her kinetic energy decreases to 170 J from 470 J. How high does she rise during this interval? Avoid air resistance.
Electron microscopy has proved invaluable for investigations of viruses, cell membranes and subcellular structures, bacterial surfaces, visual receptors, chloroplasts, and the contractile properties of muscles. The "lenses" of an electron microsco..
A 1.5 {rm kg} block rests on top of a 7.5 {rm kg} block. The cord and pulley have negligible mass, and there is no significant friction anywhere. What force F should be applied to bottom block so the top block accelerates to the right at 2.60 m/s^..
A paperweight is made of a solid glass hemisphere with index of refraction 1.50. The radius of the circular cross section is 4 cm. The hemisphere is placed on its flat surface, with the centre directly over the 2.5 mm long line drawn on a sheet of ..
A student eats a candy bar that may give 1.8 * 10^6 joules of energy. if the student has a mass of 60 kg, how high will he have a climb a ladder to offset completely the energy contained in the candy bar.
Does papillary muscles contract after the other ventricular muscles so that they can take up the slack on the chordae tendineae before the full force of ventricular contractions sends blood against the AV valve flaps.
imagine a linebacker collides with a stationary quarterback and they become entangled. what will happen to the velocity of the linebacker-quarterback system if momentum is conserved.
Two charged dust particles exert a force of 8.5 x10-2 N on each other. What will be the force if they are moved so they are only one-seventh as far apart.
A 1348 kg weather rocket is launched straight up. The rocket motor provides a constant acceleration for 13.6 s, then the motor stops. The rocket altitude 29.6 s after launch is 2091 m. You can avoid any effects of air resistance. What was the rock..
How much force is needed to hold a 7.0 cm diameter hose delivering 440 L/min through a 0.73cm diameter nozzle.
Problem on elevator
A 13kg box slides 4 m down the frictionless ramp , then collides with a spring whose spring constant is 180Nm.
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