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Một ô tô khối lượng 3 tấn, sau khi khởi hành 10 s đi được quãng đường dài 25 m. Lực cản tác
dụng vào ô tô luôn bằng 1000 N. Tìm:
a. Lực phát động của động cơ xe.
b. Vận tốc và quãng đường xe đi được sau 20 s.
c. Muốn xe sau khi khởi hành được 10 m đạt vận tốc 10 m/s thì cần thay đổi lực phát động như thế nào?
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Answers: 3
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Complete the statement about memory improvement. ( )involves organizing and breaking down information into easier groups to expand capacity. rehearsal is the verbal repetition of information. these techniques are especially important for the improvement of ( ) memory.
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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?
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Một ô tô khối lượng 3 tấn, sau khi khởi hành 10 s đi được quãng đường dài 25 m. Lực cản tác
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