At the top of the arc in a swinging pendulum the value of the kinetic energy is zero.
<h3>
What is Kinetic energy?</h3>
This is defined as the energy possessed by a body virtue of its motion or movement.
When a pendulum swings, it possesses kinetic energy which is usually zero at the top of the arc after which it possesses potential energy as a result of the resting position.
Read more about Kinetic energy here brainly.com/question/8101588
Answer:
distance between object and image = 18.9 cm
Explanation:
given data
radius of curvature = 18 cm
focal length = 1/2 radius of curvature
magnification = 40%
to find out
distance between object and image
solution
we know lens formula that is
1/f = 1/v + 1/u ....................1
here f = 18 /2 and v and u is object and image distance
and we know m = 40% = 0.40
so 0.40 = -v / u
so here v = - 0.40 u
so from equation 1
1/f = 1/v + 1/u
2/18 = - 1/0.40u + 1/u
u = -13.5 cm ..................2
and
v = -0.40 (- 13.5)
v = 5.4 cm ......................3
so from equation 2 and 3
distance between object and image = 5.4 + 13.5
distance between object and image = 18.9 cm
Sodium sulfide formula is Na₂S.
Na is a group 1 element, it has one valence electron therefore it is ready to give that valence electron and form an ionic bond. Once it gives out the electron it becomes a positive ion - Na⁺
sulfur is a group 6 element, has 6 electrons its outer shell and needs to gain 2 more electrons to become stable. Once it gains 2 electrons it becomes a negative ion - S²⁻.
Since Na only gives out 1 electron, S²⁻ ion needs to take in 2 electrons, therefore forms an ionic compound with 2 Na⁺ ions.
decomposition of Na₂S is as follows;
Na₂S(s) --> 2Na⁺(aq) + S²⁻ (aq)
Answer:
The increase in amount of ozone layer in stratosphere, will be beneficial in preventing the intense and harmful radiations, such as Ultra Violet Rays, to reach the surface of earth.
Explanation:
Ozone layer is formed when a single atom of oxygen (O) reacts with a molecule of oxygen (O₂) to form O₃ (Ozone). The ozone layer in the stratosphere is formed by the reaction of oxygen molecule (O₂) with a single atom of oxygen (O), which is formed by splitting up of an oxygen molecule, by the sunlight.
This ozone layer in stratosphere absorbs harmful radiations, such as Ultra Violet Rays and prevents them to reach the earth. If these rays reach the surface of earth, they can cause life damage to human bodies.
<u>Thus, the increase in amount of ozone layer in stratosphere, will be beneficial in preventing the intense and harmful radiations to reach the surface of earth.</u>