Answer:
last option
Explanation:
photovoltaic cell is when the sun's energy will be converted to as electricity causing an effect to create light for houses
Answer:
Polished surfaces reduce heat loss
Answer:
Explanation:
Given
-- radius of hydrogen atom
<em>See attachment</em>
Required
Determine the radius of magnesium atom (R)
From the attachment, the ratio of a hydrogen atom to a magnesium atom is:
Simplify
Represent the radius as ratio:
Substitute
Equate both ratios
Express as fraction
Cross Multiply
Hence, the radius of the magnesium atom is: 
Answer:
1. B
2. C
3. B
4. A
5. D
Explanation:
The set of scenarios in this question depicts the NEWTONS THIRD LAW OF MOTION, which states that when an object 1 exerts an action force on an object 2, the object 2 exerts a reaction force that is opposite but equal in magnitude on object 1.
- In question 1, a ball (object 1) bounces on the ground (object 2). According to Newton in his third law, the ball and the ground exert forces on each other with equal magnitude but in opposite directions.
- In question 2, according to Newton third law of motion described above, If two moving objects collide, then they will move away from each other in opposite directions.
- In question 3, if two metal balls with the same mass hang so that they are touching each other. When the ball on the left is pulled to the side and released, it swings back and hits the ball on the right causing the ball on the right to move to the right while that on the left to move left (opposite directions).
- In question 4, bumper cars at an amusement park demonstrate third law of Newton in such a way that if two bumper cars collide with a certain force, then they will move away from each other in opposite directions with the same force.
- In question 5, when the octopus ejects the water out, the water acts with an equal force on the octopus in the opposite direction causing the octopus to propel itself through the water. This demonstrates Newton third law of motion.
Answer:
third charge must be placed at x = -298.11 cm
Explanation:
When two opposite charges are placed in a straight line then the electric field is always zero at a point near to the charge of lesser magnitude
so here let say the point where electric field is zero lie on the left side of 7.00 micro C charge at a distance "x" from it
so we will have net electric field due to both charges will be zero at that point
so electric field of charge 1 must be equal to the electric field of charge 2
so we have
now square root both sides
so third charge must be placed at x = -298.11 cm
