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A 20-mC charge is 4 cm above an unknown charge q. The electric intensity at a point 1 cm above the 20-mC charge is 2.20x109 N/C and is directed upward. What are the magnitude and sign of the unknown charge?
A beam of light passes through a polarizer and then an analyzer. find the angle between the axes of the polarizer and the analyzer
A pulley system lifts 400N to height of 15 meters in 6 seconds. How much work is done on the object. What power was generated
the generation rate for a contaminant is 25 mgmin. the dilution volume flow rate is 4000 cfm. what is the equilibrium
What was the bullet's flight time. A marble is thrown horizontally with a speed of 11 m/s from the top of a building. When it strikes the ground, the marble has a speed that makes an angle 38° with the horizontal. From what height above the ground..
An electron moves from point A where the potential is Va=+20.0kV to point B where the potential is Vb=- 40.0 kV. what was the change of the system's electric potential
A cart traveling at 0.3 m/s collides with stationary object. After the collision, the cart rebounds in the opposite direction. In which collision is the impulse on the cart greater
hat is the magnitude of the total flux through the five non-shaded faces.
An 82.0 kg skydiver jumps out of a balloon at an altitude of 1 280 m and opens the parachute at an altitude of 190 m. what is the speed of the diver when he lands on the ground
A child and sled with a combined mass of 42.0 kg slide down a frictionless slope. what is the height of the hill
the motion of a projectile fired at t0. it initial speed is 50 ms and its initial projection angle is 45 degree from
Larger animals have sturdier bones than smaller animals. A mouse's skeleton is only a few percent of its body weight, compared to 16% for an elephant. what fraction of the tensile strength is the stress on the femur
A mass of 0.25 kg is attached to a horizontal spring with a spring constant of 4.0 N/m. Write an expression for the position of the mass as a function of time
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