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One force of 30 N acting East and a second second force of 20 West on an object of a mass m = 20 Kg. What is the magnitude and direction of the acceleration a of the object?
A convex mirror used in a store has a focal length of -60 cm. A person in the aisle is 2.0 m from the mirror. How far from the mirror is the image
The current in a 100 watt lightbulb is 0.800 A. The filament inside the bulb is 0.220 mm in diameter. What is the current density in the filament
suppose that the speed of light in a vacuum were one million times smaller than its actual value c 3.00 times 102 ms.
At a given instant, the blood pressure in the heart is 1.8 x 104 Pa. If an artery in the brain is 0.37 m above the heart, what is the pressure in the artery
What is the sign of the charge of the particle?
A high diver of mass 65.0 kg steps off a board 10.0 m above the water and falls vertical to the water, starting from rest. what average upward force did the water exert on her
A vehicle starts from C, goes 50 kilometer in a straight line to D, immediately turns around and returns to C. Find the magnitude of the average velocity of the car for this round trip
What is an average number of ozone molecule
The motor of a table saw is rotating 3450 rev/min. A pulley attached to the motor shaft drives a second puller of half the diameter by means of a V-belt. Estimate the radial acceleration of points on the outer edge of the blade to see why sawdust d..
A steel ball of mass m1 = 1.1 kg and a cord of length of L =1.8 m of negligible mass make up asimple pendulum that can pivot without friction about the pointO, as in the figure below.
Select all possible pairs of communities in which the two fire engines could be located to ensure that all communities can be reached in 30 minutes or less. What is the final site selection from the community pairs
A 0.425 kilogram particle slides around a horizontal track. The track has a smooth vertical outer wall forming a circle with a radius of 1.50 meter. Find the total number of revolutions the particle makes before stopping
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