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A 7.5-m 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 4.9 mm. Find the force between those two wires.
If you know the mass of a star and a planet's radius and speed at perihelion (closest approach to the star), What is its speed and distance from the Sun at aphelion
A converging lens is placed 20.0 cm to the right of a diverging lens of focal length 7.0 cm. Calculate the focal length of the converging lens
In an integrated circuit, the current density in a 2.9 ??m?thick× 71 ??m?wide gold film is 7.7×105A/m2, How much charge flows through the film in 15 min
A 130 g ball with speed 7.5 m/s strikes a wall perpendicularly and rebounds in the opposite direction with the same speed. find the magnitudes of the average force on the wall
A 2 kg box is raised from rest a distance of 3 m by a vertical force of 110 N. Find the final kinetic energy of the box
A group of college students eager to get to Florida on a spring break drove the 795-mi trip with only minimum stops. How many hours did the trip take
A beam of protons, each with kinetic energy 40 MeV, approaches a step potential of 30 MeV. What fraction of the beam is reflected and what fraction transmitted
During 0.27 s, a wheel rotates through an angle of 2.20 rad as a point on the periphery of the wheel moves with a constant speed of 2.69 m/s
A 105 granite cube slides down a 40 frictionless ramp. At the bottom, just as it exits onto a horizontal table, it collides with a 265 steel cube at rest. How high above the table must the granite cube be released to give the steel cube a speed of..
A block on a 30 degree incline has an initial velocity of 3.5 m/s up the incline. How long until it returns to where it started from
To develop muscle tone, a woman lifts a 4.50 kg mass held in her hand. She uses her biceps muscle to flex the lower arm through an angle of 60.0°. How much work does she do
A clean and dry core sample weighing 425 g was 100% saturated with a 1.07 specific gravity brine, Calculate the porosity of the rock sample
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