Frequency is 1/period. f=1/0.5 = 2Hz
The correct answer is: Average Power = 500 W
Explanation:
Root-mean square voltage = Vrms = Vpeak /√2 = 100 / √2 volts
Resistance = R = 10 Ω
Average power = Pavg = (Vrms)^2<span> / R </span>= (100 * 100) / (2 * 10) = <span>500 W</span>
A solar eclipse occurs when the moon crosses in front of the Sun, blocking some or all of its rays. A lunar eclipse happens when the moon is directly behind the earth, blocking the moon from receiving light. The only light comes from the light on earth's reflected shadow.
You can look at a lunar eclipse because there is very little light or none at all. You can't look at a solar eclipse because you are looking directly at the sun unless it is complete. Before totality, only some of the Sun is blocked, causing your pupils dilate to let in more light. Since they do this, more of the Sun's rays can be let in to the eye, which effectively allows your eyes to burn.
Some doctors and eye care specialists say that after someone complains of blindness after looking at a solar eclipse unaided, they can see what the Sun and moon looked like at the time that they looked at it, as it is burned onto their retinas.
Answer:
r = 0.56 m
Explanation:
The power emitted by the radar is evenly distributed in a sphere, so let's use the ratio of intensity and power
I = P / A
A = P / I
A = 10.0 / 2.50
A = 4 m²
Let's find the radius of the sphere of this area
A = 4π r²
r = √ A / 4π
r = √ 4 / 4π
r = 0.56 m
Answer:
Option A is correct.
The total distance is 105 kilometers, and the total displacement is 15 kilometers east.
Explanation:
- Distance is a scalar quantity, so it doesn't have anything to do with direction.
- Distance only adds up the magnitude. so,
Distance = 60 + (60-15) = 60+ 45 = 105 km
- Displacement is a vector quantity,it should be calculated by concerning truck's direction too.
- Considering the direction and magnitude,
Displacement = +60(E) -45(W) = 15 km East
