Answer:
Explanation:
Average acceleration is defined as the change on velocity on an interval of time:
with Vf the final velocity, Vi the initial velocity and t the time interval. Note that the initial velocity is positive because is in the positive x direction and final velocity is negative because is in the opposite direction, so:
The negative sign indicates that the acceleration is in the negative x direction.
<span>Examples of genetically engineered (transgenic) organisms currently on the market include plants with resistance to some insects, plants that can tolerate herbicides, and crops with modified oil content.</span>
Answer:
Explanation:
Let magnetic force F acts towards right and the string makes an angle of θ with the vertical in equilibrium .Let T be tension in equilibrium
T cos θ = mg
T sin θ = F
Dividing
Tan θ = F / mg
F = mg Tanθ
= 51.5 x 9.8 x 10⁻³ x 26 / 20.8 Tanθ = 26 / 20.8 )
= 630.875 X 10⁻³ N
I'd say (D) as in water waves or light
(A) is wrong because EM waves don't need a medium.
(B) is wrong because it says material which should act as a medium as well.
(C) is wrong because it's way of the real meaning.
Answer:
The answer to your question is below.
Explanation:
Question 10.
Halogens are a group in the periodic table (VIIA), these elements have seven electrons in their outermost shell. Examples of halogens are Chlorine, Fluorine, and Bromine.
The correct answer is the first one.
Question 2.
The answer is false, in a neutral atom, the number of protons and electrons are equal but the number of neutrons is different.
Question 3
Nine is the atomic number of fluorine
Question 4
Group is correct
Question 5
True, elements with similar electron configurations are in the same group, so they have similar chemical and physical properties.
Question 6
Alkali metals and have one valence electrons.
Question 7
True
Question 8
8, elements with 8 electrons in their outermost shell are stable.
Question 9
6, due to oxygen has 6 valence electrons it is in group VIA.