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A steel railroad track is 1.8 km long at 20.1°C. On a 48.8°C day, how much longer (in meters) is it than at the previous temperature? Give answer to two decimal places.
Radio waves of very long wavelength can penetrate farther intoseawater than those of shorter wavelength. What is their wavelength in air
A step-down transformer is used for recharging the batteries of portable devices. find the rms output voltage of the transformer
A 7.5m long extension cord carries a current of 12 amps. The cord is made of two wires, carrying currents in opposite directions, separated by a distance of 4.9mm
A 2300 kg truck has put its front bumper against the rear bumper of a 2300 kg SUV to give it a push. What is the maximum possible acceleration the truck can give the SUV
A spaceship moves away from the Earth with a speed of 0.80c. Thespaceship then fires a missile with a speed of 0.50c relative to the spaceship. What is the velocity of the missile measured by observers on the Earth if the missile is fired toward th..
A ladder 2.05 m long, weighing 229 N, initially lies flat on the ground. The ladder is raised to a vertical position. Compute the work done by the force lifting the ladder
whenever the velocity changes there is a non-zero acceleration. the change can be in only the magnitude of the velocity
A 2.1 multiplied by 103-kg car starts from rest at the top of a 4.5-m-long driveway that is inclined at 16° with the horizontal. find the speed of the car at the bottom of the driveway
A ladder of negligible mass and length 5.00 m rests against a vertical wall. The ladder makes an angle of 53.1 with the ground. Find the forces of the ground and the wall on the ladder
A box of mass 52.0 kg is connected to a second box with a mass of 58.0 kg. Both are sitting on a horizontal surface, find the magnitude of the tension in the string between the two boxes
a force of 8n acts on an object on a frictionless horoizontal surface. the force acts in a vertical plane at an angle
A glider of mass 0.155kg is moving to the right on a frictionless, horizontal air track with a speed of 0.760m/s. Find the magnitude of the final velocity of the 0.155kg glider
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