Acircuit consists of a series combination of 6.50 −kω and 5.00 −kω resistors connected across a 50.0-v battery having negligible internal resistance. you want to measure the true potential difference (that is, the potential difference without the meter present) across the 5.00 −kω resistor using a voltmeter having an internal resistance of 10.0 kω.(a) what potentialdifference does the voltmeter measure across the 5.00-kω resistor? (b) what is the true potential difference across thisresistor when the meter is not present? (c) by what percentage isthe voltmeter reading in error from the true potentialdifference?

Aheat engine running backward is called a refrigerator if its purpose is to extract heat from a cold reservoir. the same engine running backward is called a heat pump if its purpose is to exhaust warm air into the hot reservoir. heat pumps are widely used for home heating. you can think of a heat pump as a refrigerator that is cooling the already cold outdoors and, with its exhaust heat qh, warming the indoors. perhaps this seems a little silly, but consider the following. electricity can be directly used to heat a home by passing an electric current through a heating coil. this is a direct, 100% conversion of work to heat. that is, 19.0 \rm kw of electric power (generated by doing work at the rate 19.0 kj/s at the power plant) produces heat energy inside the home at a rate of 19.0 kj/s. suppose that the neighbor's home has a heat pump with a coefficient of performance of 4.00, a realistic value. note: with a refrigerator, "what you get" is heat removed. but with a heat pump, "what you get" is heat delivered. so the coefficient of performance of a heat pump is k=qh/win. an average price for electricity is about 40 mj per dollar. a furnace or heat pump will run typically 200 hours per month during the winter. what does one month's heating cost in the home with a 16.0 kw electric heater? what does one month's heating cost in the home of a neighbor who uses a heat pump to provide the same amount of heating?

Write a full page that sumerizes thermodynamics it’s from the website visionlearnig

Which of the following is the main energy source for the sun? a. fission of hydrogen b. fusion of hydrogen c. fusion of helium d. fission of iron