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A roughly spherical volume of rock 2.1 km in radius is 30% denser than the surrounding rock, whose density is 2900 kg/m3. The denser rock is centered 2.5 km below Earth's surface. By what percentage is the surface value of g directly above the denser rock increased due to its excess density? Hint: Treat the "extra" mass of the denser rock as a gravitating sphere, and calculate the gravitational acceleration it produces at Earth's surface.
A steel cable has a cross-sectional area 3.44 × 10-3 m2 and is kept under a tension of 3.33 × 104 N. At what speed does a transverse wave move along the cable
Two identical conducting spheres, fixed in place, attract each other with an electrostatic force of -0.7692 N when separated by 50 cm, center-to-center, What were the initial charges on the spheres
An ideal gas is expanded isothermally from 20L to 30L. During thismethod , 6J of energy is expended by the external mechanism that expanded the gas. Which of the statements is correct.
At one instant a bicyclist is 50 m due east of a park's flagpole, going due south with a speed of 9 m/s. Then, 24 s later, the cyclist is 45 m due north of the flagpole, going due east with a speed of 20 m/s. For the cyclist in this 24 s interval,..
A stone has a mass of 6.00 x10-3 kg and is wedged into the tread of an automobile tire. The coefficient of static friction between the stone and each side of the tread channel is 0.84.
the next two questions refire to the following scenario. Determine the horizontal velocity of the arrow
The coil of a generator has a radius of 0.20 m. When this coil is unwound, the wire from which it is made has a length of 7.50 m. What is the peak emf of this generator
Two teams of nine members each engage in a tug of war. The first team's members have average masses of 70 kg and exert average forces of 1350 N horizontally, What is the acceleration of the two teams
A blower releases a ball down the lane with a linear velocity at release of 12 meters per second. what was the angular acceleration of the arm to the release point
An audio amplifier delivers to the speaker alternating voltage at audio frequencies. what is the time-averaged power transferred to it
An object is placed 19 cm to the left of a converging lens of focal length 29 cm. Find the position and magnification of the final image
Light inside an optical fiber tube hits the wall between the tube and air and is totally internally reflected. what is the index of refraction of the tube
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