Answer: The correct answer is gravity.
Gravity is a force by which one object attracts the other object towards its center.
Gravity keeps all of planet in the orbit around the sun. Higher the mass of the object or body , more will be the force of gravity.
Sun has more mass as compared to the other planets. The Sun pulls the all other planets towards its center. Therefore, all planets revolves around the Sun.
Therefore, the planets are pulled towards the Sun by gravity.
increasing its thickness
there are four major factors that affect the resistance of a metal wire, they are;
1. the length of the wire: the longer the length of a wire the higher the resistance
the above equation shows a direct relation between resistance and length
2. the temperature of the wire: the higher the temperature of a wire when heated up, the higher the resistance of the wire
3. the thickness or width of the wire: the higher the thickness the lower the resistance.
from the equation in 1 above, there is an inverse relationship between resistance and area(diameter inclusive) of a wire
4. the material of the wire: different wires have different values of resistivity(ρ). steel shows higher levels of resistivity than copper
therefore, increasing thickness reduces resistance
its d. all of the above
D is the answer.
in oceans and underground.
Correct answer choice is :
C) Nine times as low.
Sound intensity level also identified as acoustic intensity is described as the energy taken by sound waves per unit area in a path perpendicular to that area. The SI unit of intensity, which involves sound intensity, is the watt per square meter (W/m2). The loudness of a sound describes the intensity of any given sound to the intensity at the start of sound. It is marked in decibels (dB).
Decrease because gravity decreases.
According to second law of motion, the weight of an object is given by the product of its mass and its acceleration.
i.e. W = m g
g is acceleration due to gravity. Here, g = 10 m/s²
Mass of an object remains constant everywhere while its weight varies. We know that g on the surface is given by :
As distance increases, the value of g decreases. As a result, the weight of an astronaut decreases.
So, the correct option is (a) "Decrease because gravity decreases".