If you average 22.8 meters/min, how many seconds will it take you to travel 467 m?
2 answers:
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Answer: 5.34 MJ
Explanation: The window is a rectangle with area:
A = 1.1(1.5)
A = 1.65 m²
We know that only 0.9 kW/m² reaches Earth so:
P =
P = 1.485 x 10³ W
Watts is an unit of Power and it can also be written as J/s.
An hour has 3600s or 3.6 x 10³s, so:
E = 1.485 x 10³ (3.6 x 10³s)
E = 5.346 x 10⁶ J
Mega is equal to 10⁶, then:
E = 5.35 MJ
A 1.1 m by 1.5 m window collects, during 1 hour of daylight, 5.35 MJ
Answer:
option B
Explanation:
we know,
Force between two charge is calculated by
r is the distance between the two charges
k is Coulomb constant.
give two small object with charge Q
now, Force
......(1)
now,
New force if another charge is equal to 4 Q
now from equation 1
Hence, the correct answer is option B
Answer:
219.9208 m
Explanation:
The new length is given by
New length= Original length *(1-Temperature change*coefficient of
thermal expansion of steel)
Here, the change in temperature is
New length=
Therefore, the new length will be 219.9208 m
Given :
- Wavelength ( λ ) = 2 m
- Speed = 4 m/s
We, have to find frequency :
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