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John starts at the origin and walks 3.0 km due east. If he then walks 30? north of east for 8.0 km, what is his distance from the origin (in km)?
Upon being struck by 240 nm photons, a material ejects electrons with a maximum kinetic energy of 2.58 eV
Two in-phase loudspeakers are located at (x, y) coordinates (-2.5 m, +2.0 m) and (-2.5 m, -2.0 m), Determine the amplitude of the sound at the five positions on the y-axis (x = 0) with y = 0.0 m, 0.5 m, 1.5 m, and 2.0 m
A small rock is thrown vertically upward with a speed of 18.0 m/s from the edge of the roof of a 40.0 m tall building. What is the speed of the rock just before it hits the street
A barge has vertical sides and a flat bottom of 320 ft^2 area. when partially filled, the barge is immersed in fresh water to a depth of 2 ft. upon removal of the load the barge rises 16.0 in.
Your airplane is caught in a brief, violent downdraft. To your amazement, the pretzels on your seatback tray rise vertically, What's the downward acceleration of the plane
A wheel has eight spokes and a radius of 33.0 . It is mounted on a fixed axle and is spinning at 2.80 . You want to shoot a 38.0 long arrow through the wheel, parallel to this axle, without hitting any of the spokes. Assume that the arrow and the ..
how long does it take the boat to make a round trip consisting.
Birds resting on high-voltage power lines are a common sight. The copper wire on which a bird stands is 2.5 cm in diameter and carries a current of 48 A. calculate the potential difference between its feet
The plumbing in an old house uses lead pipes (which are now considered hazardous). what is the change in the length of the pipe
Catapult fires an 800-kg rock with an initial velocity of 100 m/sat a 40° angle from ground. What is the magnitude of the horizontal impulse
It takes the elevator in a skyscraper 4.5s to reach its cruising speed of 12m/s. What is the passenger's weight before the elevator starts moving
An aluminum rod is 22.0 cm long at 20°C and has a mass of 350 g. If 14,000 J of energy is added to the rod by heat, what is the change in length of the rod
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