1. A 138.0 g metal block absorbs 4.512 × 103 J of heat to increase its temperature from 25°C to 110°C.
What is the substance? Show your work.
Specific Heats of Selected Substances
Substance C [J/(kg·C)] 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
Answer: 128 2. A 6.0 V battery is hooked up with three resistors (R1, R2, and R3) in parallel with resistances of 2.0 Ω, 4.5
Ω, and 10.0 Ω, respectively.
a.) Draw a labeled circuit diagram for the circuit described using correct symbols. (Use computer drawing
tools or hand draw, scan and copy and paste.)
b.) Calculate the equivalent resistance.
c.) Calculate the current passing through each resistor in the circuit. Answer: 3. tA pulley system is used to raise a 140.0 N crate 6.5 m from the loading dock to the ship. This requires a
force of 80.0 N to be applied by the longshoreman.
a.) What is the mechanical advantage of the pulley system?
b.) What is the efficiency of the system if the ideal mechanical advance of the system was equal to
3?
c.) Find both the work input and work output assuming the efficiency found in part b. Answer: 4. A 600.0 kg roller coaster car is at rest at the top of a 110.0 m hill. It rolls down the first drop to a height of
40.0 m then goes up the next hill where it is moving at 30.0 m/s at the top. It then rolls down the second hill
until it is at ground level. Draw a picture of the roller coaster (there should be 2 hills) and calculate the kinetic
and potential energy at the top and bottom of each hill. Label your work clearly. You should have 4 locations
with both KE and PE energy shown. Answer: 5. A 5.0 cm object is 10.0 cm to the left of a convex lens with a focal length of +7.0 cm.
a.) Draw a ray diagram of the setup showing the location of the image.
b.) Calculate the distance of the image from the lens.
c.) Calculate the height of the image and identify the type of image (virtual, real, upright, inverted) Answer:

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