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A luge and its rider, with a total mass of 81 kg, emerge from a downhill track onto a horizontal straight track with an initial speed of 30 m/s. If a force slows them to a stop at a constant rate of 3.9 m/s2, (a) what magnitude F is required for the force, (b) what distance d do they travel while slowing, and (c) what work W is done on them by the force? What are (d)F, (e)d, and (f)W if they, instead, slow at 7.8 m/s2?
The energy of the first excited state of a hydrogen atom is -0.34 eV ± 0.0003 eV. What is the average lifetime of for this state
A pipe open at one end and closed at the other has a fundamental frequency of 308 Hz at 3.70 degrees
A particle with positive charge q = 1.28 x 10^(-18) C moves with a velocity = (3i + 2j - k ) m/s through a region where both a uniform magnetic field, Calculate the total force on the moving particle
Two earthquake waves of the same frequency travel through the same portion of the Earth, What is the ratio of the amplitudes of the two waves
An explorer in dense jungles of equatorial Africa leaves his hut. He takes 41 steps at an angle 45 north of east, then 81 steps at an angle 60 north of west, then 51 steps due south. Suppose his steps all have equal length. Save him from becoming ..
According to a report on traumatic brain injury, the force that a professional boxer's fist exerts on his opponent's head is equivalent to being hit with a 5.9 kg bowling ball traveling at 8.9 m/s that stops in 0.018s
a 4.0 kilogram cart moving to the right and a 6.0 kilogram cart moving to the left on a horizontal frictionless surface. find the magnitude of the total momentum of the two-cart system
A playground merry-go-round of radius R = 2.20 m has a moment of inertia I = 235 kg · m2, What is the new angular speed of the merry-go-round
A uniform plank of length 4.7 m and weight 221 N rests horizontally on two supports, with 1.1 m of plank hanging over the right support. To what distance x can a person who weighs 440 N walk on the overhanging part of the plank before it just begi..
An airplanes airspeed (relative to still air) is 135 mph. The wind speed relative to the ground is 37 mph and is directed at theta = 51 deg
A solenoid is made of 400.0 turns of wire, wrapped around a hollow cylinder of radius 1.0 cm and lengh 5.0 cm. What is the self-inducatance of the solenoid
A transparent oil with index of refraction 1.18 spills on the surface of water (index of refraction 1.33), determine the thickness of the oil slick
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