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A watermelon cannon fires a watermelon vertically up into the air at a velocity of +13.5 m/s, starting from an initial position 1.20 meters above the ground. When the watermelon reaches the peak of its flight, what is (a) its velocity, (b) its acceleration, (c) the elapsed time, and (d) its height above the ground?
Two 100kg lead spheres are suspended from 160m -long massless cables. The tops of the cables have been carefully anchored exactly 1.0m apart
A square plate of copper with 54.0 cm sides has no net charge and is placed in a region of uniform electric field of 84.0 kN/C directed perpendicularly to the plate. Find the charge density of each face of the plate
A long, straight conducting wire of radius R has a non uniform current density J =J0r/R, where J0 is fix. Estimate the expression for the magnetic field strength inside the wire at radius r
question what mass in grams of hydrogen is produced by the reaction of 4.73 g of magnesium with 1.83 g of
A 921 kg car is moving rightward with a speed of 29.0 m/s. find the average resistive force acting upon the car
A camera requires 5.2J of energy for a flash lasting 1.0 ms. What power does the flashtube use while it%u2019s flashing
A ball is released from the top of a cliff; it hits the ground 1.6 seconds later. Assuming the ball is a free falling object, how many meters is the cliff above the ground below
When n moles of an ideal gas is allowed to expand from an initial volume of 10 m3 at a constant temperature T the work done is equal to : - nRT ln 4, What was the final volume of the gas
A box of mass of mass 2 kg is placed on a spring such that when the box is released, the spring will push the box directly upward. what is the maximum height the box will reach
A sled weighs 100N. It is held in place on a frictionless 20 degrees slope by a rope attached to a stake at the top, the rope is parallel to the slope. What is the normal force of slope acting on the sled.
Unpolarized light of intensityI0is incident on three polarizing filters. The axis of the first is vertical, that of the second is29° from vertical, and that of the third is horizontal. What light intensity emerges from the third filter?
A projectile is fired horizontally from a gun that is 41.0m above flat ground. The muzzle velocity is 260 m/s. What is its speed as it strikes the ground
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