0.775gcm-3
0.875gcm-3
0.780gcm-3
0.880gcm-3
Correct answer is A
\(V_A = \frac{M}{D} = \frac{21}{0.7} = 30cm^3\)
\(V_w = \frac{M}{D} = \frac{10}{1} = 10cm^3\)
Vmixture = 30 + 10 = 40cm3
Mmixture = 21 + 10 = 31g
Dmixture = \(\frac{m}{v} = \frac{31}{40} = 0.775\)
12.5s
2.5s
2.0s
1.2s
Correct answer is C
It takes X 5s for 1 complete vibration.
⇒ It takes X (5 x 20)s for 20 vibrations.
= 100s.
It takes Y 100s for 50 vibrations.
⇒ The period of Y = \(\frac{100}{50}\)s
= 2s.
500.0g
400.0g
44.4g
25.0g
Correct answer is D
clockwise moment = Anti-clock wise moment
= M x 40 = 100 x 10
M = \(\frac{1000}{40}\)
= 25g
0.25ms-2
0.80ms-2
3.20ms-2
4.00ms-2
Correct answer is B
S = ut + \(\frac{1}{2} at^2\)
40 = 0 x 10 + \(\frac{1}{2}\) x a x 102
50a = 40
a = \(\frac{40}{50}\)
= 0.8ms-2
1.00s
2.00s
2.18s
3.00s
Correct answer is B
T = \(\frac{2u}{g} = \frac{2 \times 10}{10} = 2s\)