Answer:
Yes, sublimation is a physical change because it involves a change of state from solid to gas of a substance when it is heated.
Normal forces occur at perpendicular angles to the surface between two objects.
Option B
<h3><u>Explanation:</u></h3>
The unit of force comes from its mathematical equation which says force is equal to the product of mass and acceleration. So, the unit of force becomes kg m/s². And this is the SI unit of force, which is also called newton. So 1 newton = 1 kgm/s².
Action at a distance forces are actually the non contact forces which can even work on a body even when the bodies aren't in contact with each other. The examples include gravitational force, magnetic and electric forces etc. So they don't need a physical contact between the two bodies.
But, normal forces are defined as the force that's acting directly on the axis of two bodies i.e perpendicularly to a surface or the part of a surface the body is resting. So, they have full impact on the touching surface.
True. Fission and fusion are key components.
Answer:
The system gains 65kJ of energy and the surroundings lose 65kJ of energy.
Explanation:
By convention of signs, ΔEsys=+65kJ means that the system gains 65 kJ of heat. According to the Law of conservation of energy, energy cannot be created nor destroyed, only transferred and transformed. So, if the system gains energy, the surroundings must lose the same amount, that is, ΔEsur=-65kJ and ΔEsys + ΔEsur = 0.
Answer:
As the planets mass distribution around the sun changes, the point which the planets orbit changes slightly, disrupting any circular orbits
Explanation:
