A is correct. There is plenty of gravity in outer space. That is what keeps the space station in orbit, as well as the moon, which is a lot farther away than the space station. The state of free fall is what orbiting actually means. The space station is falling down toward the earth, but due to its (fast) motion horizontal to the earth's surface, it's motion isn't straight down. In fact, as it moves horizontally, it falls down at the same rate that the curved surface of the earth "falls away" underneath it. So unlike most projectiles that fall with a curved trajectory and hit the ground, things in orbit have a curvature to their trajectory that matches the curvature of the earth. So instead of hitting the ground, the ground is curving away at the same rate the object falls.
Since all things fall at the same rate, the space station, astronauts, and everything else inside are all falling at the same rate and so they feel weightless. This would be the same in an elevator that was in free fall on earth, but since that would only be moving downward, it would eventually crash into the ground.
Prejudice has to do with the inflexible and irrational attitudes and opinions held by members of one group about another, while discrimination refers to behaviors directed against another group. Being prejudiced usually means having preconceived beliefs about groups of people or cultural practices.
Explanation:
Answer:
Increasing the tension on a string increases the speed of a wave, which increases the frequency (for a given length). Pressing the finger at different places changes the length of string, which changes the wavelength of standing wave, affecting the frequency.
Explanation:
Answer:E = hc/? = 4.41 x 10-19 J
Energy absorbed by each atom :
E (atom) = 2.205 x 10-19 J
Now Bond Energy of each molecule (B) = 3.98 x J
So, for each atom 1.99 x 10-19 J
So now
KE of each atom = E(atom) - B (atom)
= 2.15 x 10-19 J
HI!
Conventional vehicles use gasoline or diesel to power an internal combustion engine. Hybrids also
use an internal combustion engine—and can be fueled like normal
cars—but have an electric motor and battery, and can be partially or
wholly powered by electricity. Also pollute less and save the drivers money.
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