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An elevator and its load have a combined mass of 1450 kg. Find the tension in the supporting cable when the elevator, originally moving downward at 13 m/s, is brought to rest with constant acceleration in a distance of 37 m.
A helium weather balloon is used to lift a meteorological sensor package high up into the atmosphere. Calculate the number of moles of helium in the balloon
question two bumper cars of equal mass m700 kg collide head-onelastically. car 1 was moving to the right at 1.5 ms
The attractive electrostatic force between thepoint charges+8.44*10^6 C and Q has a magnitude of 0.975 N when the separationbetween the charges is 1.31 m. find the sign and magnitude of the charge Q
While surveying a cave, a spelunker follows a passage 190{\rm m} straight west, then 210{\rm m} in a direction 45.0^\circ east of south, and then 260{\rm m} at 30.0^\circ east of north. After a fourth unmeasured displacement, she finds herself back w..
A beam of unpolarized light shines on a stack of five ideal polarizers, Find the angle between the axes of each pair of adjacent polarizers
question given a typical wave function describing the state of a particle as a function of x at time t0 how would you
A satellite revolves around a planet at an altitude equal to the radius of the planet. The force of gravitational interaction between the satellite and the planet is F_0. Then the satellite moves to a different orbit, so that its altitude is tripl..
A length of aluminum wire has a resistance of 14.0 ? at 22.0°C. When the wire is warmed in an oven and reaches thermal equilibrium, Neglecting thermal expansion, find the temperature of the oven
An air conditioner is used to keep the interior of a house at a temperature of 20 C while the outside temperature is 35 C. If heat leaks into the house at the rate of 12 kW, and the air conditioner has the efficiency of a Carnot engine, what is the m..
A metal ball with a mass of 3.71·10-6 kg and a charge of +5.77 mC has a kinetic energy of 4.99·108 J. It is traveling directly at an infinite plane of charge with a charge distribution of +3.21 C/m2. If it is currently 1.87 m away from the plane of c..
A convex lens with f1= 19.9 is mounted 40.0cm to the left of a concave lens. When an object is placed 30.8cm to the left of the convex lens, What is the focal length of the concave lens
A baseball pitcher throws a baseball horizontally at a linear speed of 42.5 m/s (about 95 mi/h). find the tangential speed of a point on the "equator" of the baseball
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