32. P = V * I
P = 230 * 4 = 920 w
In short, Your Answer would be: 920 w
33. I = P/V
I = 48/12 = 4 A
In short, Your Answer would be: 4 Ampere
34. Now, for this part you've given Voltage & Power, and you need to calculate Current & Resistance, so you could apply two equations here:
(i) For finding Current = P/V
(ii) For resistance = V²/P
So, Current for Bulb of Study Lamp = 60/230 = 0.260 A
Resistance of Bulb of Study Lamp = 230²/60 = 881.67 Ohm
In similar manner, substitute the known values (Power & Voltage) in each case, you'll have your answers!
35. We know, P = V²/R
P = 230²/48
P = 1102.08 w
Hope this helps!
Answer:
Lateral inversion will occur in a plane mirror.
Explanation:
When words are displayed in a plane or flat mirror, the result is that if the words are displayed left, they change to right and if they were normally displayed right, they change to left. This phenomenon is known as lateral inversion. So, this will apply to the words, Science and optics. Only the sides will be interchanged.
A plane mirror reflects light, therefore, the image that is produced by it remains the same size. The image produced will not appear upside down. Only the sides will be interchanged.
Answer:
Work Done by the earth's gravitational force on the satellite as it travels from apogee to perigee is
W = F*D*Cos90° = 0
Explanation:
Although there is a change in the kinetic energy of the satellite at the apogee and perigee, the work done by the earth's gravitational force on the satellite is Zero.
W = F.D, F is the gravitational force, D is the displacement. Both F and D are vectors and perpendicular to each other. That is, the angle between F and D is 90°.
