Length is not a vector because you only need to state a unit (etc. meters, centimetres, or feet) and not a direction
Answer:
mass times acceleration (F = ma)
Explanation:
From Newton's second law, force is the product of mass and acceleration.
F = ma
Mass times velocity is called momentum.
Distance divided by time is average velocity.
Answer:
20 seconds
Explanation:
we know,
speed=distance by time
therefore time= distance by speed
so,
time=5000m by 25m|s
=20 seconds
<span>Heat comes from stove flame to the sauce pan by radiation through infrared energy, heat conducts the metal of the sauce pan; Convection brings cool water to the hot surface at the bottom of the hot sauce pan until all or most of the water is hot enough to boil.</span>
Answer:
correct answer is option d (Light emitted by an element produces a unique identifying spectrum.)
Explanation:
Each element has different atomic number and atoms of an element can radiate a certain amount of energy. Different elements have different atomic spectrum and it can be used to determine the composition of a material.
When atoms are excited to higher energy state after some time they came back to lower state by emitting their excess energy in the form of light. This light has certain wavelength. This emitted light can be seen as a series of different colored lines and between two colored lines there is a dark space. This series of colored lines is called a line spectra or atomic spectra.
