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A web page designer creates an animation in which a dot on a computer screen has a position of r "" [4.0 cm +(2.5 cm/s2),z]i + (5.0 cm/s)IJ. (a) Find the magnitude ami direction of the dot's average velocity between I = 0 and I = 2.0 s. (b) Find the magnitude and direction of the instantaneous velocity at I = 0, I = 1.0 S, and I = 2.0 s. (c) Sketch the dot's trajectory from I = 0 to I = 2.0 s, and show the velocities calculated in pan (b).
A 60.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 1.36 102 m/s from the top of a cliff 162 m above level ground, obtain the initial total mechanical energy of the projectile
A 300 DC power supply has fully charged a 15 mF capacitor. The charged capacitor is connected to a 20 mH inductor. find the magnetic energy in the inductor
A 186 watt motor is used to lift a 114kg container to a height of 6m. How much time does it take to lift the container with the motor.
A nonconducting solid sphere of radius R has a volume charge density that is proportional to the distance from the center. That is, ? = Ar for r R, Find the expressions for the electric field inside the sphere
A 390 nm thick film floats on a puddle of water. When illuminated normally with 700 nm light there is no reflection, but 400 nm light is strongly reflected. What is the film's index of refraction
A scaffold that weighs 275N supports two painters, one weighing 150N and the other weighing 325N, What should the reading on the right scale be
Sam heaves a shot with weight 16-lb straight upward, giving it a constant upward acceleration from rest of 45.5m/s2 for a height 63.0cm, What is the speed of the shot when he releases it
An unstable particle is at rest and suddenly breaks up into two fragments. No external forces act on the particle or its fragments. One of the fragments has a velocity of +0.800c and a mass of 1.87 10-27 kg, while the other has a mass of 4.31 10-27 k..
q1. sound waves of frequency 502 hz enter a window 1.18 m wide. the window is in the exact center of one wall of a
A girl delivering newspapers covers her route by traveling 9.99 blocks west, 4.00 blocks north, and then 1.00 blocks east
If John Glenn weighed 640 N on Earth's surface, a) how much would he have weighed if his Mercury spacecraft had (hypothetically) remained at twice the distance from centre of Earth? b) Why is it said that an astronaut is never truly "weightles".
The red block in the %u201CSame Volume%u201D floats in water. what volume of the blue block would float above the water line if the blue block was placed on top of the red block in the water
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