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A water droplet of radius 0.015 mm remains hanging stationary in the air. If the electric field of Earth is 100 N/C, how many electrons must the water droplet lack? In which direction the electric field of Earth must be directed for that problem to make any sense at all?
How much energy is required to accelerate a spaceship with a rest mass of 128 metric tons to a speed of 0.403 c?
A 3.00-kg block is connected to two ideal horizontal springs having force constants k1 = 28.0N/cm and k2= 19.0N/cm What is the maximum speed of the block
A rock is thrown vertically upward with a speed of 11.0 from the roof of a building that is 40.0 above the ground. Assume free fall. What is the speed of the rock just before it strikes the ground?
a car is traveling due north at 19.3m/s. find the velocity of the car after 7.03 s if its acceleration is 1.30m/s^2 due north
A series RLC circuit with a resistance of 280? has capacitive and inductive reactances of 320? and 460? , respectively. What is the power factor of the circuit
A car goes around a curve on a road that is banked at an angle of 31.5 degrees. What is the radius of the curve
A golf ball rolls off the top of a flight of concrete steps of total vertical height 2.40m. what is the bounce height on the fourth bounce
A sledge loaded with bricks has a total mass of 18.0 kg and is pulled at constant speed by a rope inclined at 19.6° above the horizontal. How much work is done by the rope on the sledge
A storage tank 23 m high is filled with pure water. (Assume the tank is open and exposed to the atmosphere at the top.), Find the gauge pressure at the bottom of the tank
The acceleration of gravity at the surface of the moon is approximately 1/6 that at the surface of the earth (9.8 m/s2). What is the weight of an astronaut standing on the moon
A ray of light is traveling in a glass cube that is totally immersed in water. What is the refractive index of the glass
While running, a person dissipates about 0.60 J of mechanical energy per step per kilogram of body mass. If a 64 kg person develops a power of 65W throughout a race, how fast is the person running? Assume that a running step is 1.5 m long.
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