6. D
7. D
8. B
let me know if you need clarification
Hmm well best i can do is: 7 km/h + 20 km/h = 27 km/h. should be your answer.
Answer: 
Explanation:
The answer is not among the given options. However, this is a good example of the relation between the energy stored in a capacitor 
and its capacitance 
, which is given by the following equation:
(1)
Where:
is the voltage
is the capacitance in Farads, the value we want to find
Isolating from (1):
(2)
(3)
Finally:
This is the capacitance of the cardiac defibrillator
Answer:
a. 2.5 X 10^-1
Explanation:
First of all we shall calculate the resistance of the bulb of 75W , 240 V .
power = V² /R , V is potential and R is resistance
75 = 240²/ R
R = 240²/ 75
= 768 ohm .
Now this bulb is used with 120 V
current = 120 / 768
= .15625 A
power = V X I
potential x current
= 120 x .15625
= 18.75 W.
comparing it with 75 W
the ratio
18.75 / 75
= 2.5 x 10⁻¹.
Answer: A chemical equation describes a chemical reaction. Reactants are starting materials and are written on the left-hand side of the equation. Products are the end-result of the reaction and are written on the right-hand side of the equation.
Explanation:
