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A charge of -5 micro-coulombs is placed at x = 0 cm, y = 0 cm. Another charge of -5 micro-coulombs is placed at x = +22 cm, y = -50 cm. When measured counter-clockwise from the x axis, what angle is the electric force vector acting on the charge at x = 0 cm, y = 0 cm directed? Answer in degrees.
A ball is thrown horizontally from a height of 16.2 m and hits the ground with a speed that is three times its initial speed. What was the initial speed?
A grating with 504 lines/mm is illuminated with light of wavelength 305 nm. What is an angular separation between the two lines formed in order m = 2.
A car is driven 225 km west and then 78 km southwest (45 degrees). What is the displacement of car from the point of origin (magnitude and direction).
What would be the equilibrium temperature when a 271 g block of copper at 280°C is placed in a 169 g aluminum calorimeter cup containing 817 g of water at 11.5°C.
At what coordinate on the axis is the net electric field produced by particles equal to zero.
A ball is released from a hot air balloon moving downward with a velocity of -10.0 meters/second and a height of 1,000 meters. How long did it take the ball to reach the surface of Earth? Given: g = -9.8 meters/second2. A. 11.2 seconds B. 12.1 sec..
What is the result of mixing 80g of ice at -20 degrees Celsius, into a 200g of water at 20 degrees Celsius?
An 18 g rifle bullet travelling 210 m/s buries itself in a 3.6 kg pendulum hanging on a 2.7 m long string, which makes the pendulum swing upward in an arc. Determine the vertical and horizontal components of pendulum's displacement.
A 2.20 kg frictionless block is attached to an ideal spring with forces constant 314N/m. At first the block has velocity -3.60 m/s and displacement 0.300-m.
A 2000 kg car traveling at a speed of 23m/s skids to the halt on wet concrete where = 0.60. How long are the skid marks.
What is the total momentum of system after the collision.
A 46 kg skater is standing still in front of a wall. By pushing against the wall she propels herself backward with a velocity of - 1.2 m/s. Her hands are in contact with the wall for 0.8 s. Ignore friction and wind resistance.
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