[SOLVED] A 138.0 g metal block absorbs 4.512 × 103 J of heat...

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1. A 138.0 g metal block absorbs 4.512 × 10³ J of heat to increase its temperature from 25°C to 110° What is the substance? Show your work.

Specific Heats of Selected Substances

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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.
   • Draw a labeled circuit diagram for the circuit described using correct symbols. (Use computer drawing tools or hand draw, scan and copy and paste.)
   • Calculate the equivalent resistance.
   • Calculate the current passing through each resistor in the circuit.

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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.
   • What is the mechanical advantage of the pulley system?
   • What is the efficiency of the system if the ideal mechanical advance of the system was equal to 3?
   • Find both the work input and work output assuming the efficiency found in part b.

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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.

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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.
   • Draw a ray diagram of the setup showing the location of the image.
   • Calculate the distance of the image from the lens.
   • Calculate the height of the image and identify the type of image (virtual, real, upright, inverted)

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