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a mass of 4 kg is pulled along a 0 deg frictionless plane by a mass of 5 kg that is hanging perpendicular connected by a rope and pulley. what is the acceleration of the masses.
10 A of current flows through a wire oriented perpendicular to a magnetic field strength of .2T, What is the magnetic force per unit length on the wire?
A 1500 kg car moving on horizontal roa with speed of 30 m/s coasts to a stop in 1800 m, once the motor is turned off. What is the resultant force of air resistance
a spring has a spring constant of 400 N/m. the spring is compressed 15 cm and a 2 kg ball is placed on the spring in its compressed state. what is the potential energy of the spring in its compressed state
In a home laundry dryer, a cylindrical tub containing wet clothes is rotated steadily about a horizontal axis as shown in the figure below. what rate of revolution is needed
A spaceship travels toward the Earth at a speed of 0.97c. The occupants of the ship are standing with their torsos parallel to the direction of travel. What are the occupants' width according to others on the spaceship
Approximately how many atoms make up our planet? For simplicity, suppose the average atomic mass of the atoms is 14 . Avogadro's number gives the number of atoms in a mole.
what did faraday and henry discover happened when a magnet was moved in a coil of wire? a a magnetic current will be
A Young's double-slit interference experiment gives bright fringes separated by 30.5 cm on a screen when the experiment is performed in air. What is the new spacing between bright fringes
A 480 g ball swings in a vertical circle at the end of a 1.9 m-long string. What is the speed of the ball at that point
A 5.60 uF parallel-plate air capacitor has a plate separation of 4.00 mm and is charged to a potential difference of 500V . Calculate the energy density in the region between the plates, in units of J/m^3
A rock of mass 33 kg accidentally breaks loose from the edge of a cliff and falls straight down. The magnitude of the air resistance that opposes its downward motion is 242 N. What is the magnitude of the acceleration of rock.
On August 19,1987, Alessandro Andrei set a world record in the shot put with a throw of 22.9 m (75 ft 2 in.). What was the maximum height the projectile reached above the ground
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