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A prospector finds a solid rock composed of granite (density = 2650 kg/m3) and gold (see table 15.1). The volume of the rock is 3.55 x 10-4 m3, and its mass is 3.81 kg. What mass of gold is contained in the rock? What percentage of the rock is gold, by volume? (Hint: find Vgold/Vrock and express it as a percentage.)
The volume control on a surround-sound amplifier is adjusted so the sound intensity level at the listening position increases from 21 to 59 dB. What is the ratio of the final sound intensity to the original sound intensity?
An object with a charge of 0.920 µC is placed at the center of a regular tetrahedron with 4 equivalent surfaces. What is the electric flux through one surface of the tetrahedron?
A 45kg pole-vaulter running at 12 m/s vaults over the bar. Her speed when she is above the bar is 1.90m/s. Avoid air resistance and determine her height as she crosses the bar.
Explain how much force must you exert to keep the pole motionless and horizontal?
How much work is done by the outside force in moving the particle from A to B?
A gauge-12 wire has diameter centimeters and length meters. while the voltage volts is applied to the ends of the wire, the current is amperes. The concentration of free electrons in the wire is per cubic meter.
A horizontal plank of mass m and length L is pivoted at one end. The plank's other end is supported by a spring of force constant k. The moment of inertia of the plank about the pivot is .
A gas expands from I to F. The energy added to the gas by heat is 418 J when the gas goes from I to F along the diagonal path. (a) What is the change in internal energy of gas? (b) How much energy must be added to the gas by heat for indirect path..
A 1500kg car skids to a halt on a wet road where coefficient of friction = 0.46. How fast was car traveling if it leaves 68m long skid marks.
Two large parallel plates stand side by side with a distance of 2.10 cm between them, Find the acceleration of the electron, Find the magnitude and direction of the electric field in the region between the plates
The first skater carries a 2-m pole that may be considered massless. As he passes the pole, What is the angular speed after the skaters are linked together
After a 0.813 nm x-ray photon scatters from a free electron, the electron recoils with a speed equal to 1.46E+6 m/s. Through what angle was the photon scattered
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