QUESTION 1

1. A 500.0 g metal block absorbs 5.875 10³ J of heat to raise its temperature by 50.0 K. What is the substance? Show your work.

Specific Heats of Selected Substances

Substance	C [J/(kgK)]
Water (ice)	2,060
Iron	450
Aluminum	897
Gold	130
Copper	385
Silver	235
Ammonia (liquid)	4,700
Water (liquid)	4,180
Water (steam)	2,020
Lead	128

Answer:

QUESTION 2

A 5.0 resistor is hooked up in series with a 10.0 resistor followed by a 20.0 resistor. The circuit is powered by a 12.0 V battery.

1. Draw a labeled circuit diagram for the circuit described using correct symbols.
2. Calculate the equivalent resistance.
3. Calculate the voltage drop across each resistor in the circuit.

Answer:

(7 points)

QUESTION 3

A man lifts various loads with the same lever. The distance of the applied force from the fulcrum is 1.50 m, and the distance from the fulcrum to the load is 0.300 m. A graph of resistive force vs. effort force is shown. What is the mechanical advantage of the lever? What is the ideal mechanical advantage of the lever? What is the efficiency of the lever? Show your work.