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If two people were 15km apart, how long would it take light to make the round trip? How does this time compare with reaction times of 0.2s?
After having collected samples along the shore all day long, a marine biologist walks back to her campsite, 1.69 km away. What distance did the dog run
a 5kg Potter's wheel (model as a disk) with radius 0.3m is spinning at 5 rad/s. what is the mass of the clas
A 8.4-kg rock and a 6.7×10-4-kg pebble are heldnear the surface of theearth. (a) Determine the magnitude of the gravitational force exerted on each by the earth. (b) Calculate the magnitude ofthe acceleration of each object when released.
A railroad car containing explosive material is initially traveling south at a speed of 4.5 m/s on level ground. The total mass of the car plus explosives is 2.5 104 kg. what is the final speed of the other piece
a radiator has an emassivity of .90 and its exposed area is 1.23 m^2. What is the heat flow rate from the radiator
A pair of oppositely charged parallel plates is separated by 5.44 mm. A potential di?erence of 631 V exists between the plates. What is the strength of the electric field between the plates
A satellite of mass 190 kg is placed into Earth orbit at a height of 400 km above the surface. how long does the satellite take to complete one orbit
Two adjacent natural frequencies of an organ pipe are determined to be 351 Hz and 405 Hz. (Assume the speed of sound is 343 m/s.) (a) Calculate the fundamental frequency of this pipe. Hz (b) Calculate the length of this pipe. m
a persons forearm consists of a bone which we can model by a rigid rod that is free to rotate around the elbow. when
A helicopter flies over the arctic ice pack at a constant altitude, towing an airborne 126-kg laser sensor which measures the thickness of the ice, find the tension in the cable towing the sensor
you were directed to measure the angle of reflection when the ray was incident on either side of the normal to the
A 240 , 50.0-cm-diameter turntable rotates on frictionless bearings at 57 . A 22 block sits at the center of the turntable. A compressed spring shoots the block radically outward along a frictionless groove in surface of the turntable. What is turn..
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