'Gram', 'kilogram', and 'metric ton' are units of mass, not weight.
'Pound' can be either a unit of mass or of force. Most people
use it most of the time to mean weight.
Answer:
A. Normal force is always perpendicular to the area of contact between an object and support.
Explanation:
Normal force is defined as the contact force. If there is no contact between the surfaces, they cannot applies a force which is normal on each other. For e.g, the surfaces of a cubical box and the cart cannot applies a force of normal on each other because of no contact.
If, when there is a contact between two surfaces they applies a normal force on each other, and this force is perpendicular to the each other . This normal force is necessary to prevent object to penetrating into other.
Answer:
Gamma rays
Explanation:
Gamma rays is at the end of the electromagnetic spectrum, and has the highest energy. It propagates through space at 3x10^8 m/s and has the smallest wavelength and the highest frequency. It is given off by atoms of element as they undergo nuclear disintegration.
The correct answer is D. The amount of food he feeds each mouse
Explanation:
In research, the independent variable refers to the variable or factor that is manipulated by the researcher. Besides this, the independent variable affects the dependent variable or factor being studied. This implies in the case presented, the dependent variable is how shiny mice's fur is because this is the variable being studied; on the other hand, the independent variable is the amount of food Jorge feeds to each mouse because this is the factor Jorge would manipulate or change to prove if the amount of food has an effect on the fur of mice.
