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A constant force, F = (4.63, ?3.79, 1.96) N,acts on an object of mass 18.9 kg, causing a displacement of that object by r = (4.26, 3.95, ?2.45) m. What is the total work done by this force?
A ski jumper takes off at an angle 20 degrees above the horizontal with a speed of 30.0m/s, Calculate the time of flight
A convex Lens of focal length 18 cm is used as the magnifying glass. At what distance from a tiny insect should you hold this lens to get a magnification of +3.00.
An 875.0-kg compact car speeds up from 22.0 m/s to 44.0 m/s while passing another car. How much work is done on the car to increase its speed
A diver is practicing for a coming game. The height of the diving tower is 10 m (from the top of board down to water surface), What is the angle at which the diver enters the water
A uniform plank of length 5.5 m and weight 205 N rests horizontally on two supports, with 1.1 m of the plank hanging over the right support .To what distance x can a person who weighs 447-N walk on the overhanging part of the plank before it just ..
A fish swimming in a horizontal plane has a velocity vi = (3.3i + 1.6j) m/s at a point in the ocean where the position relitive to a certian rock is ri = (10.5i - 3.9j) m. After the fish swims with a constant acceleration for 20.6 s, it's velocity..
A fighter jet is launched from an aircraft carrier with the aid of its own engines and a steam-powered catapult. obtain the work done on the jet by the catapult
A physics professor is pushed up a ramp inclined upward at an angle 28.0 above the horizontal as he sits in his desk chair that slides on frictionless rollers. Use the work-energy theorem to find his speed at the top of the ramp
An electron is released from rest at the negative plate of a parallel plate capacitor. The charge per unit area on each plate is ? = 1.90 10-7 C/m2, and the plates are separated by a distance of 1.5 10-2 m. How fast is the electron moving just bef..
A balloon is filled with helium at a pressure of 2.4 x 10^5 Pa. The balloon is at a temperature of 18 degrees Celsius, How many helium atoms are contained in the balloon
A 51-kg skier coasts up a snow-covered hill that makes an angle of 25° with the horizontal. What is the magnitude of the kinetic frictional force
questiona car travels all along a straight line at a constant speed of 48.5 mih for a distance d and then another
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