Answer:
c- The windows are not energy efficient, but the roof is energy efficient.
Explanation:
Answer:
The relation is n = c/v where c is speed of light in a vacuum....v is the speed of light in the new medium ......n is the refractive index of the material
Answer:
-90cm
Explanation:
u=−30cm and magnification m=(−v/u)=−3 so v=(3u)image is real so m should be negative v should be negative so v=−90cm
putting the above values of v and u in the Mirror equation,
f1=u1+v1
we get focal length f=−22.5cm and image position v=−90cm
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Answer:
67.8 m.
Explanation:
For 0.3 sec which is the response time , he will keep on moving with velocity
undiminished or at 26 m/s .
Distance travelled during this period
= 26 x .3 =7.8 m
For rest of the time ie during 4 - .3 = 3.7 s , he decelerates with deceleration of 5.3 ms⁻² and initial velocity of 26 m/s
s = u t - 1/2 a t²
s = 26 x 3.7 - .5 x 5.3 x 3.7 x 3.7
= 96.2 - 36.28
= 60 m approx.
Total distance travelled
=60 + 7.8 = 67.8 m.