A piece of wood is floating on water. The forces acting on the wood are
upthrust and reaction
weight and reaction
weight and upthrust
upthrust and viscousity
weight and viscousity
Correct answer is C
No explanation has been provided for this answer.
Ripples on water are similar to light waves in that they both
have the same wavelength
are longitudinal
cannot be reflected
travel at the same speed
can be refracted and diffracted
Correct answer is E
No explanation has been provided for this answer.
N0.65
N0.13
N3.90
N39.00
N234.00
Correct answer is B
PT = (5 x 50) + (100 x 4)
= 650watts
Energy(kWhr) = 650 x 10-3 x 10
= 6.5 kWhr
1kWhr cost 2 kobo ; 6.5 kWhr will cost \(\frac{2 \times 6.5}{1}\)
= 13 kobo
2.0 x 102Jkg-1k-1
2.0 x 102Jkg-1
4.0 x 104Jkg-1k-1
4.0 x 104kg-1
8.4 x 103Jkg-1k-1
Correct answer is C
Heat energy = Electrical energy
mc\(\theta\) = power x time
5 x 1 x 10-2 x C = 100 x 20
C = 4.0 x 104Jkg-1k-1
2.0Hz
7.0Hz
8.8Hz
14.0Hz
17.6Hz
Correct answer is B
W = \(\frac{v}{r}\)
= \(\frac{0.88}{0.02}\) = 44 rad/s
2\(\pi\)F = W = 44
F = \(\frac{44}{2 \times 3.142}\)
= 7Hz