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A spherical 3-mi diameter comet impacts the earth with a velocity of 20 mi/s. The average density of the comet is 7 g/cm^3. Calculate the amount of heat released from the impact site. Express the answer as megatons of TNT explosive equivalent.
A 0.1 kg hockey puck is moving forward along the ice at 5 m/s just before it is hit by a player's hockey stick. find the linear impulse applied by the hockey stick to the puck
What is the bubble's diameter just as it reaches the surface of the lake, where the water temperature is 20 ^circC? Suppose that the air bubble is always in thermal equilibrium with the surrounding water.
A two-ended "rocket" that is at first stationary on a frictionless floor, with its center an origin of an x axis.
A 150 kg hoop rolls along a horizontal floor so that the hoop's center of mass has speed of 0.180 m/s. How much work must be done on the hoop to stop it.
Ann was reaching up to grab a box of cereal that was on top of the refrigerator. She had extended her arm as well as stood on her tip-toes to reach the box. Which primary muscle allowed Ann to extend her elbow and which 2 primary muscles allowed h..
A rock is tossed straight up with a velocity of 14 m/s When it returns, it falls into a hole 10m deep.
In a series R-L-C circuit, the phase angle is 40.5?, with the source voltage leading the current, Find the reactance of the inductor
A fugitive tries to hop on a freight train traveling at a constant speed of 5.4m/s . Just as an empty box car passes him, What is the distance traveled to reach the box car
In a nebula, the amount of interstellar extinction in the visible wavelength band is 1.1 magnitudes. The thickness of the nebula is estimated to be 16 pc and it is located 458 pc away.
A duck has a mass of 2.6 kg. As the duck paddles, a force of 0.11 N acts on it in a direction due east. In addition, the current of the water exerts the force of 0.12 N in a direction of 44° south of east. When these forces begin to act, the velocity..
If the orientation of the spacecraft is to be changed by 30.0°, for what time interval must the gyroscope be operated.
A block (m+12 kg) is moving at a speed of 7.0 m/s on a level surface. A force of 25 N is applied in the direction that is moving but it comes to a stop in a distance 625 cm
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