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What is meant by the phrase geologic time? Why is amber important for paleontology? Why are the most abundant fossils those of marine creatures? Give some examples of replaced remains.
A 16.1-kg sled is being pulled across a horizontal surface at aconstant velocity. The pulling force has a magnitude of 77.5 N andis directed at an angle of 29 ° above the horizontal. Determinethe coefficient of kinetic friction.
An object of mass 4.0 kg is allowed to fall from rest under the force of gravity for 3.4 s. What is the change in its momentum
An object is thrown up in theair straight up and it takes 10 seconds to reach a maximum height. What is the object's initial speed?
A step-down transformer is used for recharging the batteries of portable devices. The turns ratio N2/N1 for a particular transformer used in a CD player is 9:72. When used with 120 V (rms) household service, the transformer draws an rms current of..
A 3.10-m-long, 340kg steel beam extends horizontally from the point where it has been bolted to the framework of a new building under construction
A ladder 7.90 m long leans against the side of a building. What is the horizontal distance from the bottom of the ladder to the building
George just graduated from college and is going on his first job interview. He has learned that there are two other candidates. Because of the information he has learned about the serial position effect, George asks to be either the first or the last..
A yo-yo has a mass of 0.604 kilogram, a moment of inertia of 0.01 kgm2, and a string that is 0.592 meter in length. find its angular velocity just before it started up
A block of mass m1 = 38 kg on a horizontal surface is connected to a mass m2 = 22.2 kg that hangs vertically, What is the acceleration of the hanging mass
The moon, mass 7.35×1022 kg, rotates around the earth in about 28 days. If the moon is about 3.84×105 km from the earth, What is the moons gravitational attraction (pull) on the earth
A cannon fires a cannonball. According to the third law the cannon exerts a force on the cannon ball (action) and the cannonball exerts an equal but opposite force on the cannon (reaction). Why does the cannonball go much further than the cannon? ..
An underwater scuba diver sees the Sun at an apparent angle of28.0° from the vertical. What is actual direction of the Sun
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