Ajoule is an amount of energy, and a watt is a rate of using energy, defined as 1 w = 1 j / s. how many joules of energy are required to run a 100 w light bulb for one day?
coal has about 30e6 j of energy per kg, but a power plant can only use 30% of this energy to make electricity (i. e., it is 30% efficient). how many kilograms of coal have to be burned to light a 100 w light bulb for one day?
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Physics, 21.06.2019 17:50
Which describes an image that can be produced by a concave lens? the image is real and smaller than the object. the image is virtual and larger than the object. the image is virtual and smaller than the object. the image is real and larger than the object.
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Physics, 21.06.2019 20:30
What property is a characteristic of a substance that can be observed and does not change the identity of the substance
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Physics, 22.06.2019 00:40
The rigid beam is supported by the three suspender bars. bars ab and ef are made of aluminum and bar cd is made of steel. if each bar has a cross-sectional area of 450 mm2, determine the maximum value of p if the allowable stress is (σallow)st = 200 mpa for the steel and ( σallow)al = 150 mpa for the aluminum. est = 200 gpa and eal = 70 gpa.
Answers: 1
Physics, 22.06.2019 08:30
What is the primary force that suspension bridges use cables to hold their spans up? a. tension force b. resistance force c. normal force d. elastic force e. applied force
Answers: 3
Ajoule is an amount of energy, and a watt is a rate of using energy, defined as 1 w = 1 j / s. how m...
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