Photons emitted from the surface of the Sun need to travel across the vacuum of space to reach our eyes. The transfer of energy from the sun across nearly empty space (vacuum) is accomplished primarily by radiation. Radiation is the transfer of energy by electromagnetic wave motion. Once the sun’s energy reaches earth, it is intercepted first by the atmosphere. A small part of the sun’s energy is directly absorbed, particularly by certain gases such as ozone and water vapor. Some of the sun’s energy is reflected back to space by clouds and the earth’s surface.
Answer:15.66 J
Explanation:
mass of block
Force magnitude=7.5 N
Initial velocity =
Final velocity=
Initial Kinetic Energy=
=
Final Kinetic Energy=
=
Work Done =Final -Initial Kinetic energy=37.714-22.056=15.66 J
There are several information's of immense importance already given. Let us now focus on the problem in hand.
Pressure = Force/Area
Area = 58.8 cm^2
= 0.0058 m2
Then
Pressure = (12 * 9.8)/0.0058
= 20275 Pascals
= 2 Pa
The correct option among all the options that are given in the question is the first option or option "A". I hope that this is the answer that has actually come to your desired help.
Answer:
The answer is 7.8 kJ / mol.
Explanation:
Energy = (number of methyl group) (Gauche interactions)(3.8kJ/mol per interaction)
= (2)(2)(3.8 kJ / mol)
= 15.2 kJ / mol.
The energy = (number of methyl group) - ( energy of gauche interactions)
= (23 kJ/mol) - 15.2 kJ/mol
= 7.8 kJ / mol.
Answer:
Upright, Reduced
Explanation:
Given that,
Height of the object, h = 20 cm
Image distance, v = 25 cm
Height of the image, h' = 5 cm
We know that the magnification of the mirror is given by :
u = -100 cm (negative due to sign conventions)
Let f is the focal length of the lens. It can be calculated as :
f = 20 cm
It is seen that the focal length of the lens is positive. So, it is a convex lens. The image formed by the convex lens is Upright, Reduced. Hence, the correct option is (a).