Answer: D. the distance between the highest points of consecutive waves
Explanation:
The wavelength of a wave is defined as the <em>distance traveled by a periodic perturbation that propagates through a medium in a given time interval</em>. It is usually represented by 
and can be calculated if the frequency of the wave is known, since there is an inverse relationship between both.
In the specific case of a periodic sine wave (which is the way in which a wave is usually represented graphically) the wavelength can be determined as the distance between two consecutive maxima of the disturbance.
Therefore, the correct option is D.
The total energy produced by the generator is 3.45 kJ. Of this energy, 2.23 kJ are lost because friction and electrical resistance, so this amount of energy is converted into thermal energy. This means that the rest of the energy is available as electric energy, and it is equal to:
Answer:
72 minutes
Explanation:
The combined rate of the two machines is 250 bolts/hr:
(100 bolts/hr) + (150 bolts/hr) = 250 bolts/hr
The number of bolts is equal to the rate multiplied by time, therefore an expression for time can be found:
Bolts = (rate)(time) >> Time = (bolts)/(rate)
The time necessary to make 300 bolts is:
Time = (bolts)/(rate)
Times = (300 bolts) / (250 bolts/hr) = 1.2 hr
The time in hours is converted to time in minutes as follows:
(1.2 hr) (60 min/hr) = 72 minutes
"Efficiency" just means that's how much of the input energy comes out useful.
For this kettle, it's 98%. That means that whatever amount of energy you put into the kettle, 98% of it comes out useful.
98% of 2,000 Joules is (0.98) x (2000J) . That's <em>1,960 Joules</em>.
