Use the following Infomadon to answer queston 174 A 0.5-klogram block alldos al 20 m/s on a smooth frictionless surface toward a stationary sphere, with a mass of 20-kllograms, as shown below. A plot of the forca exerted on the block by the spharga a function of tlma is shown below. 17. Calculate the Impulse applied to the block by the sphere. Use the following Information to answer questions 18 & 19: The dlagram below shows three points on a roller coaster track. A car starts from rest at polnt X and travels along the track. Assume friction is negligible. 16 m Helght HERE X 18. Identify whether the car's gravitational potential energy increases, decreases, or stays the same as the car moves from point X to point Y. 19. The car has a mass of 600 kg. Calculate the gravitational potential energy of the car at its maximum height.​

A500g object falls off a cliff and losers 100 j from its gravitational potential energy store. if the gravitational field strength g=9.8n/kg, how high is the cliff?

Which safety measures should you follow during a thunderstorm? check all that apply. (a) avoid touching anything that conducts electricity. (b) avoid touching a person who has been struck by lightning. (c) go outside. (d) keep your computer turned off. (e) stay out of water. (f) stay inside.

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?