the car will be able to stop immediately the driver notices the dog
the car will stop 30m after hitting the dog
the car will stop 20m in front of the dog
the driver will quickly reverse the car
the car will stop 5m beyond the dog
Correct answer is B
F=ma
2000=800 x a
a = \(\frac{2000}{800}\) → 2.5
V\(^2\)=u\(^2\)+2as
400=2 × 2.5 × S
S =400 ÷ 5 → 80
: 80 - 50 = 30
The car will stop 30m after hitting the dog
All of the following frequencies are overtones of 320 Hz EXCEPT
960Hz
640Hz
520Hz
1280Hz
1600Hz
Correct answer is C
Overtones are frequency which are multiples of fundamental frequency
Fundamental frequency - f1 = 320Hz
Overtones 320 x 2 = 640Hz
320 x 3 = 960HZ
320 x 4 = 1280Hz
320 X 5 = 1600hZ
567km
410km
594km
500km
600km
Correct answer is D
R2 = 3002 + 4002
R2 = 90000 + 160000
R = \(\sqrt{250000}\)
= 500km
The resistance of a 240V, 60 watt electric filament bulb is
0.25\(\Omega\)
480\(\Omega\)
60\(\Omega\)
240\(\Omega\)
960\(\Omega\)
Correct answer is E
power = IV
power = \(\frac{V^2}{R}\) = 60
= \(\frac{240^2}{R}\)
= 960\(\Omega\)
When a ray of light passes from water to glass, it is
bent away from the normal
bent towards the normal
totally internally reflected
absorbed by the glass
broken into a pure spectrum
Correct answer is B
No explanation has been provided for this answer.