750N
745N
735N
98N
Correct answer is C
Net force = Upward force - weight
ma=F−mg
With constant velocity, acceleration = 0, therefore, ma = 0
∴.
| Marks | 0 | 1 | 2 | 3 | 4 | 5 |
| Number of candidates | 6 | 4 | 8 | 10 | 9 |
3 |
The table above shows the distribution of marks scored by students in a test. Find the interquartile range of the distribution.
4
3
2
1
Correct answer is B
No explanation has been provided for this answer.
| Marks | 0 | 1 | 2 | 3 | 4 | 5 |
| Number of candidates | 6 | 4 | 8 | 10 | 9 | 3 |
The table above shows the distribution of marks scored by students in a test. How many candidates scored above the median score?
3
12
22
30
Correct answer is B
The total number of candidates = 40, therefore, the median occurs as the average between the 20th and 21st candidates. = \frac{3+3}{2} = 3
Number of candidates that scored above 3 : 9 + 3 = 12.
Given that r = 2i - j, s = 3i + 5j and t = 6i - 2j, find the magnitude of 2r + s - t.
\sqrt{15}
4
\sqrt{24}
\sqrt{26}
Correct answer is D
r = 2i - j , s = 3i + 5j , t = 6i - 2j
2r + s - t = 2(2i - j) + (3i + 5j) - (6i - 2j) = i + 5j
|2r + s - t| = \sqrt{1^{2} + 5^{2}} = \sqrt{26}
p : the subject is difficult
q : I will do my best
Which of the following is equivalent to 'Although the subject is difficult, I will do my best'?
p \vee q
\sim p \vee q
p \wedge (\sim q)
p \wedge q
Correct answer is D
No explanation has been provided for this answer.