Answer:
2.3x10⁷ W/m²
Explanation:
The intensity (I) of a laser is its potency (P) divided by the area (A) that it is affected. The potency is the energy applied (or absorbed) in a period, thus id 91.0% of the energy is absorbed, so:
E = 0.91*540 = 491.4 J
And,
P = E/t, where t is the time in seconds
P = 491.4/4.00
P = 122.85 J/s
P = 122.85 W
The are of a circular spot is:
A = (π/4)*d²
Where d is the diameter. Thus, with d = 2.60 mm = 0.0026 m
A = (π/4)*(0.0026)²
A = 5.31x10⁻⁶ m²
I = P/A
I = 122.85/5.31x10⁻⁶
I = 2.3x10⁷ W/m²
Answer:
Newton realized that the reason the planets orbit the Sun is related to why objects fall to Earth when we drop them. The Sun's gravity pulls on the planets, just as Earth's gravity pulls down anything that is not held up by some other force and keeps you and me on the ground.
Explanation:
Answer:
If the planet has a lower orbital radius it means the planets proximity to the sun is farther away. The climate of the planet will be colder than a planet that would have a closer proximity to the sun.
When a man travels from earth to space, the mass of the person, defined as the amount energy a matter has remains constant. However, when he moves to space, gravity decreases until such time that there is no gravity that acts on the person. Weight thus changes or decreases until the point of state called weightlessness.
