Explanation:
If the fourth pupil has a mass of x, and the fifth pupil has a mass of x+5, then the mean mass is:
51 = (49 + 53 + 52 + x + x+5) / 5
255 = 159 + 2x
x = 48
x + 5 = 53
The fourth pupil has a mass of 48 kg.
The fifth pupil has a mass of 53 kg.
Answer:
53.06°
Explanation:
refractive index of air = 1
refractive index of water, n = 1.33
Let the angle of polarisation is ip.
Use Brewster's law,
n = tan ip
1.33 = tan ip
ip = 53.06°
thus, the angle of polarisation is 53.06°.
The answer to the question is A
Answer:
Being environmentally friendly means having a lifestyle that is better for the environment
Answer:
2.9Ω
Explanation:
Resistors are said to be in parallel when they are arranged side by side such that their corresponding ends are joined together at two common junctions. The combined resistance in such arrangement of resistors is given by;
1/Req= 1/R1 + 1/R2 + 1/R3 .........+ 1/Rn
Where;
Req refers to the equivalent resistance and R1, R2, R3 .......Rn refers to resistance of individual resistors connected in parallel.
Note that;
R1= 6.0Ω
R2 = 9.0Ω
R3= 15.0 Ω
Therefore;
1/Req = 1/6 + 1/9 + 1/15
1/Req= 0.167 + 0.11 + 0.067
1/Req= 0.344
Req= (0.344)^-1
Req= 2.9Ω
