\(\frac{2 \pi r^2}{P}\)
\(\frac{2 \pi r}{P}\)
\(\frac{2 \pi}{rp}\)
\(\frac{P}{2 \pi r}\)
Correct answer is B
No explanation has been provided for this answer.
N
Pa
W
J
Correct answer is C
No explanation has been provided for this answer.
A device that converts mechanical energy into electrical energy is
a dynamo
an electric motor
an induction coil
a transformer
Correct answer is A
No explanation has been provided for this answer.
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.