PRE-LAB Instructions: Print out these pages. Feel free to refer to the lab instructions and other materials, your physics textbook, other students, etc. to help you to ponder, understand, and work out answers to the following question(s). If your instructor requires you to turn in this prelab, please show your work& answers in the space(s) provided.
PRE-LAB Questions:
1) You want to find the volume of a metal sphere (Note: the formula for the volume of a sphere is V = 4/3 pi r^2 , where r is the radius of the sphere). You nmeasure the radius of the sphere to be r = 2.18 cm, with a measurement uncertainty of± 0.02 cm, what is the volume of the sphere as well as the corresponding uncertainty of the calculated volume?
2) You measure the mass of the same sphere used in question 1, and find that its mass is m = 122.2 g, with a measurement uncertainty of± 0.1 g. What is the density of the sphere as well as the corresponding uncertainty of the calculated density?

The sun generates both mechanical and electromagnetic waves. which statement about those wave is true?

In a steady-flow steam power plant system, two adiabatic high-pressure and low-pressure turbines ane used to generate power. superheated steam enters the high-pressure turbine at 8 mpa and 550°c. the steam expands in the high-pressure turbine to a saturated vapor at 3 mpa. in order to increase the powe generation of the power plant, another steam turbine working in a lower pressure ranges is deployed. the outlet vapor from the first turbine is heated up at a boiler to the temperature of 500 c at the constant pressure of first turbine's outlet (3 mpa). then, the vapor enters the second turbine and produces extra work. the exit conditions of the second turbine are 5o kpa and 90 percent quality. if the total power output of the power plant is 25 mw, determine a) the mass flow rate of the water (kg/s). b) heat transfer rate in the boiler (mw). (30 points) 3 mpa 00 c 8 mpa s0 c high pres turbine low pres boiler turbine 50 kpa 3 mpa 09 saturated vapor t heat engine, shown in the figure, operates between high temperature and low temperature of through a heat 4. a carnot tn and tu respectively. this heat engine receives energy from a heat reservoir at t exchanger where the heat transferred is proportional to the temperature difference as ? = k (z,-7, ). it rejects heat at a given low temperature tl. to design the heat engine for maximum work output, find the high temperature, th, as a function of tes and t. (15 points) qe

1. a camcorder has a power rating of 19 watts. if the output voltage from its battery is 7 volts, what current does it use?answer units 2. a 1.5m wire carries a 6 a current when a potential difference of 57 v is applied. what is the resistance of the wire? yourunits 3. a clothes dryer uses about 2 amps of current from a 240 volt line. how much power does it use? yourunits 4.