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A plane inclined at an angle of 30° to the horizontal has an efficiency of 60%.the force parallel to the plane required to push a load of 120n uniformly up the plane is
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Adding more pulleys to a system of pulleys needed to lift an object. a. increases the force b. decreases the force c. increases the amount of work d. decreases the amount of work
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Which types of electromagnetic waves have higher frequencies than the waves that make up ultraviolet light? check all that apply. radio waves infrared light microwaves gamma rays visible light x-rays
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A plane inclined at an angle of 30° to the horizontal has an efficiency of 60%.the force parallel to...
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