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An empty railroad car of mass 4400 kg is being pulled beneath a grain elevator that dumps grain at the rate of 175 kg/s. If the coefficient of friction among the car wheels and the track is 0.021, what is the force required to keep the car moving at a constant speed of 1.9 m/s 25.0 s after the grain is first dumped on the car
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two lens that are l29 cm apart are used to form an image. lens 1 is converging and has a focal length f112 cm lens 2 is
A four-cylinder gasoline has an efficiency of 0.25 and delivers 180J of work per cycle per cylinder. The engine fires at 25 cycles per second. What is the total heat input per second form the gasoline
a 50db sound wave strikes an eardrum whose area is 5.6 x 10-5 m2. how much energy is absorbed by the eardrum per
A certain copper wire has a resistance of 11.0?. What is the resistance of each piece
(a) A clear image of an object is formed on the retina of a human eye. As the object moves closer to the eye, for a clear image to still be formed on the retina.
A pulley of radius 20cm and moment of inertia is suspended from a ceiling and has a long string of negligible mass wound around it. A ball of mass 1kg is connected to the string and released from rest from a height of 2m above the floor. Calculate th..
a refrigerator maintains an interior temperature of 4 degree c while the temperature near its heat exhaust is 30 degree
In a liquid with a density of 1500 kg/m^3, longitudinal waves with a frequency of 360 Hz are found to have a wavelength of 7.70 m. Calculate the bulk modulus of the liquid
A drinking straw 20 cm long and 3 mm in diameter stands vertically in a cup of juice 8.0cm in diameter. A section of straw 6.5cm long extends above the juice. A child sucks on the straw, and the level of juice in the glass begins dropping at 0.23c..
A record turntable rotates through 5.0 rad in 2.8 s as it is accelerated uniformly from rest. What is the angular velocity at the end of that time
A meterstick of negligible mass has a 0.15kg mass at its 38cm mark and a 0.35kg mass at the 78cm mark. Where should the fulcrum be so the meterstick is balanced
1850 kg car is set in mottion on a level road by a spring constant k=2.40x10^6 N/m that has been compressed 1.50m. what is the intial mechanical energy of the system
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