8. A crate of bananas weighing 3000 N is shipped from South America to New York, where it is unloaded by a dock worker. The worker lifts the crate by pulling with a force of 200 Non
the rope of a pulley system. What is the mechanical advantage of the pulley system?
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An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?

(a) assume the equation x = at^3 + bt describes the motion of a particular object, with x having the dimension of length and t having the dimension of time. determine the dimensions of the constants a and b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.) (b) determine the dimensions of the derivative dx/dt = 3at^2 + b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.)

Apositive charge moves in the direction of an electric field. which of the following statements are true? check all that apply. check all that apply. 1.the potential energy associated with the charge decreases. 2. the electric field does positive work on the charge. 3. the electric field does negative work on the charge. 4. the potential energy associated with the charge increases. 5. the electric field does not do any work on the charge. 6. the amount of work done on the charge cannot be determined without additional information.