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Careful measurements of local variations in the acceleration due to gravity can reveal the locations of oil deposits. Assume that the Earth is a uniform sphere of radius 6370 km and density 5500 kg/m3, except that there is a spherical region of radius 1.1 km and density 810 kg/m3, whose center is at a depth of 2.2 km. Suppose you are standing on the surface of the Earth directly above the anomaly with an instrument capable of measuring the acceleration due to gravity with great precision. What is the ratio of the acceleration due to gravity that you measure compared to what you would have measured had the density been 5500 kg/m3 everywhere? (Hint: Think of this as a superposition problem involving two uniform spherical masses, one with a negative density.)
A thermos contains 150cm^3 of coffee at 85 celsius. To coolthe coffee, you drop two 11-g ice cubes into the thermos. What is the final temperature of the coffee
A microwave oven can heat 205 of water from 20.0 to 90.0 in 2.00 . If the wavelength of the microwaves is = 15.2 , how many photons were absorbed by the water?
A circuit consists of a 6.0V battery, a 37-mH inductor, and four 55 ohm resistors. Find the characteristic time for this circuit
q. a 0.500 rm kg glider on an air track is attached to the end of an ideal spring with force constant 459 rm nrm m it
An electric heater carries a current of 16.5 A when operating at a voltage of 1.50 102 V. What is the resistance of the heater
A 1200 kg ore cart is rolling at 10.8 m/s across a flat surface. A crane dumps 493 kg of ore (vertically) into the cart. How fast does the cart move after being loaded with ore? Assume that frictional forces with the flat surface may be neglected.
Two ants race across a table 66 cm long. One travels at4.42 cm/s and the other at 3cm/s. When the first one crosses thefinish line, how far behind is the second one
A javelin thrower releases a javelin 1.50 meters above the ground at an angle of 48.0 degrees. what was the initial velocity of the javelin
While visiting Planet Physics, you toss a rock straight up at 13 m/s and catch it 2.3 s later. What is the mass of Planet Physics
A bird is flying directly toward a stationary bird-watcher and emits a frequency of 1380 Hz. What is the speed of the bird
A particle moves along the x axis. It is initially at the position 0.210 m, moving with velocity 0.090 m/s and acceleration -0.340 m/s2. Find its velocity at the end of this time interval
Two very large parallel plates are oppositely and uniformly charged. The field between the plates is 1.7×106N/C, How much total charge is on each plate if they are 18.0cm on a side
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