Answer:
Due to potential difference (elaborated in explanation)
Explanation:
When a bird sits on a power line, its whole body is in contact with the power line. It does not have any contact with the ground or anything at a lower potential. Hence, the current does not flow through the bird's body, because there is no potential difference available as a driving force.
Now, when a person touches the power line his hand is at a higher potential provided by the power line, while the rest of his body is connected to the ground, usually through legs. The current always looks for a path from high potential to low potential. Therefore, the body of the person serves as the path for the current. Heavy current flows through the body and the person dies within split seconds.
Answer: A. Frequency
B. Wavelength
Explanation: Electromagnetic waves are waves which can travel through the vacuum. Electromagnetic waves have electrical and magnetic component associated with them.
Electromagnetic waves are arranged in order of increasing frequencies or decreasing wavelengths.
Radio waves, X-rays, and gamma rays are all electromagnetic waves which have different wavelengths and thus have different frequencies. But they all travel with the speed of light.
The order of frequency of given waves : gamma rays > X rays> Radio waves.
The order of wavelength of given waves : gamma rays < X rays < Radio waves.
Answer: 70m
Explanation:
Given, 2 skaters, one with a mass of 60kg.
Another 75kg.
Distance is 14m.
Assuming the system centre if mass does not change, both skaters would meet at the centre of the mass
let the 60kg skater be xm away from the centre, then, the 75kg skater would be (14 - x)m away from the centre too
m1x + m2(14 - x) = 0
m1x + 14m2 - m2x = 0
60x + 14*75 - 75x = 0
60x - 75x + 1050 = 0
-15x + 1050 = 0
15x = 1050
x = 70
Thus, the distance the 65kg skater moves is 70m
I = 4.50 amps
R = 6.20 ohms
V = ???
V = I * R
V = 4.5 * 6.2
V = 27.9 volts.
