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Q. A flowerpot falls from a windowsill 23.0 m above the sidewalk. Ignoring air resistance, how fast will it be moving when it strikes the ground? How long will it take to strike the ground?
Q. A 45.0-kg girl is standing on a 144-kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. The girl begins to walk along the plank at a constant velocity of 1.56 m/s to the right relative to the plank. (Let the direction the girl is moving in be positive. Indicate the direction with the sign of your answer.) What is her velocity relative to the surface of ice?
What is the velocity of the plank relative to the surface of ice?
A chair of weight 74.0 N lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of F = 47.0 N directed at an angle of 41.0^circ below the horizontal and the chair slides along floor.
A major-league catcher gloves a 93 mi/h pitch and brings it to rest in 0.14m. If the force exerted by catcher is 803 N, what is the mass of the ball.
A box weighing 300N is shoved across the floor of an apartment by a force of 400 N exerted downward at an angle of 35.2° below the horizontal. If the coefficient of kinetic friction between the box and the floor is 0.540, how long does it take to mov..
A ship has a mass of 40000 kg. its energy gives it an acceleration of 0.27 m/s while it travels a distance of 105 meters from rest. what force does the engine exert on the ship.
Guess scale factor of the Universe
How much energy is necessary to bring the system back
Calculating plants maximum possible thermal and actual efficiency.
What range is appropriate
A dynamite blast at a quarry launches a rock straight upward, and later it is rising at a rate of 15m/s. Assuming air resistance has no effect on the rock, calculate the total time the rock is in the air.
An automobile tire has a radius of 0.330 m, and its centre moves forward with a linear speed of v= 15.0 m/s. Find the angular speed of the wheel.
The minimum stopping distance for a car travelling at a speed of 30 {rm m/s} is 60 {rm m}, including the distance travelled during the driver's reaction time of 0.54 {rm s}.
What is swimmer velocity relative to the bank
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