(7 points) 1. A 500.0 g metal block absorbs 5.875 x 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/(kg.K)] 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. (7 points) 2. A 5.0 0 resistor is hooked up in series with a 10.0 Q resistor followed by a 20.0 Q resistor. The circuit is powered by a 12.0 V battery a.) Draw a labeled circuit diagram for the circuit described using correct symbols. b.) Calculate the equivalent resistance. c.) Calculate the voltage drop across each resistor in the circuit. Answer:(7 points) 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. Lever: Resistive Force vs. Effort Force Resistive force (M) 0 T T T T | 10 20 a0 40 h0 Effort force (M) Answer: (7 points) 4. An 800.0 kg roller coaster car is at rest at the top of a 95 m hill. It rolls down the first drop to a height of 31 m. When it travels to the top of the second hill, it is moving at 35 m/s. It then rolls down the second hill until it is at ground level. Draw a picture of the roller coaster drop and calculate the kinetic and potential energy at the top of the second hill. Answer: (7 points) 5. An object is 35.0 cm to the left of a convex lens with a focal length of +8.0 cm. Draw a ray diagram of the setup showing the location of the image. Calculate the distance of the image from the lens. Is the image upright or inverted