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To verify her suspicion that a rock specimen is hollow, a geologist weighs the specimen in air and in water. She finds that the specimen weighs twice as much in air as it does in water. The density of the solid part of the specimen is 3.3 × 103 kg/m3. What fraction of the specimen's apparent volume is solid?
A 0.025 kg golf ball moving at 21.0 m/s crashes throughout the window of a house in 2.0 10-4 s. After the crash, ball continues in the same direction with a speed of 10 m/s. assuming the force exerted on the ball by the window was constant, what w..
A random sample of 42 college graduates revealed that they worked the average of 5.5years on the job before being promoted. The population standard deviation was 1.1 years. Using 0.99 degree of confidence, what is the confidence interval for the po..
A 56-? loudspeaker, a 8.9-? loudspeaker, and a 2.3-? loudspeaker are connected in parallel across the terminals of an amplifier. Determine the equivalent resistance of the three speakers
Heat Q flows spontaneously from a reservoir at 445 K into a reservoir at 265 K. Because of the spontaneous flow, 2620 J of energy is rendered unavailable for work when a Carnot engine operates between the reservoir at 265 K and a reservoir at 248 K. ..
What is the kinetic energy of a carbon atom moving with a speed of 500 m/s.
calculate the force of gravity between the earth and the moon. moons mass=7.4x10^22 kg ; average earth moon distance =3.8x10^8 m. Express your answer to two significant figures and include appropriate units. F=G((m1m2)/d^2)
Two resistors have resistances R(smaller) and R(larger), where R(smaller)
a 15 g rubber bullet hits a wall with a speed of 150 m/s. What force did the wall apply to the bullet
A microscope has an objective lens with a focal length of 16.22 mm and an eyepiece with a focal length of 9.76 mm. what is the actual diameter of the red blood cell
The cockroach finds a bread crumb on the rim and, of course, stops. What is an angular speed of the lazy Susan after the cockroach stops.
A freight car with a mass of 2500 kg rolls down an inclined track through a vertical distance of 1.5m. at bottom of the incline, on a level track, the car collides and couples with the identical freight car that was at rest. What percentage of th..
A rope, assumed massless, is stretched horizontally between two supports that are 3.43 m apart. obtain the tension in the rope
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