3. A carpenter uses a crowbar to remove the top of a box. The top has a resistance of 500 N. The

carpenter applies an input force of 250 N. What is the mechanical advantage of the crowbar?

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The carburetors on inboard mounted gasoline engines must be equipped with an approved back-fire flame arrestor. what purpose does having a back-fire flame arrestor play?

There are competitions in which pilots fly small planes low over the ground and drop weights, trying to hit a target. Part A A pilot flying low and slow drops a weight; it takes 3.

If x=3 mg and y = 9 kg then y = ? a. 3 * 10^5 b. 3 * 10^3 c. 3 * 10^ 6 d. y = 3*10^9

Why there will be a change in the sole of the shoes after using many days?

List two examples of situations were neutral object is charged by conduction, induction and friction

Why is thermal energy from the Sun transferred to Earth through electromagnetic waves instead of any other type of thermal energy transfer? Electromagnetic waves can carry energy through matter. Electromagnetic waves can travel through empty space.

Why do different elements emit different colors of light

In an experiment, 108 J of work was done on a closed system. During this phase of the experiment, 79 J of heat energy was added to the system. What was the total change in the internal energy of the system?

J. J. Thomsons experiments provided evidence that an atom

How does our sun differ from most other main sequence stars?