Physics, 01.02.2022 08:40 Franklyn3220
Directions: Consider a 2-kg bowling ball sits on top of a building
that is 40 meters tall. It falls to the ground. Think about the
amounts of potential and kinetic energy the bowling ball has:
· as it sits on top of a building that is 40 meters tall.
. as it is half way through a fall off a building that is 40 meters
tall and travelling 19.8 meters per second.
· as it is just about to hit the ground from a fall off a building
that is 40 meters tall and travelling 28 meters per second.
When
Answers: 1
Physics, 22.06.2019 03:40
Science and technology are interdependent. advances in one lead to advances in the other. give an example of this phenomenon.
Answers: 1
Physics, 22.06.2019 08:00
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?
Answers: 2
Physics, 22.06.2019 11:30
In order of decreasing light-transmitting capabilities of materials, which is the correct sequence? a. transparent -> translucent -> opaque b. opaque -> transparent -> translucent c. opaque -> translucent -> transparent d. translucent -> transparent -> opaque
Answers: 1
Physics, 23.06.2019 06:00
How can you improve the percent yield of copper in this lab? check all possible strategies that will you do so. measure reactants precisely. stir to the reaction take place. chill the reactants before combining them. wait patiently until the reaction completes. make sure to recover as much copper as possible.
Answers: 1
Directions: Consider a 2-kg bowling ball sits on top of a building
that is 40 meters tall. It fall...
Mathematics, 19.03.2021 19:20
History, 19.03.2021 19:20
Mathematics, 19.03.2021 19:20
Mathematics, 19.03.2021 19:20
Mathematics, 19.03.2021 19:20
SAT, 19.03.2021 19:20
Computers and Technology, 19.03.2021 19:20
Mathematics, 19.03.2021 19:20
Biology, 19.03.2021 19:20
History, 19.03.2021 19:20
Mathematics, 19.03.2021 19:20
Mathematics, 19.03.2021 19:20
Mathematics, 19.03.2021 19:20