Answer:
400cm^2
Explanation:
sides are 20cm long Area for a square is a squared
since all the lides are of equal length you can just choose one side.
20squared is 400
20 x 20 = 400cm squared
Hope this helps :)
Answer:
Answer is 519.3 J
Explanation:
GPE = m x g x h
Object Height is equal to 7.2 x sin42 = 7.2 x 0.669 = 4.817m
GPE = 11 x 9.8 x 4.817 =519.3 J
Most probably m value (11kg) has been used as 7.2 mistakenly.
Answer: The correct answer is A.
Explanation:
Condenser is a device which transfers the heat. It is used to condense the gas to its liquid by cooling it.
The ignition points is a minimum temperature at which the substance will start burning but without any additional application of heat.
The function of the condenser in a coil ignition circuit is to reduce the spark. It is use to keep the points from sticking together during ignition. Otherwise it may lead to burn the point.
Therefore, the function of the condenser in a breaker points ignition system is to prevent electricity from arching across the points.
The distance of earth from sun is 150 million km
We know that one million = 10^6 and 1 km= 10^3 m
Hence 150 million km = 150× 10^6 ×10^3 metre=150×10^9 m
=1.5×10^11 m
The speed of light in vacuum is 2.999... m/s which can be approximately close to 3.0 ×10^8 m/s
We are asked to calculate the time taken by the light beam to reach from sun to earth.
we know that average velocity
⇒
Here distance=1.5×10^11 m and v=c= 3.0×10^8 m/s
hence time
=0.5×10^3 s
=5.0×10^2 s
A correct scientific notation is written as m×10^n [Here m is the magnitude and n is power of 10]
Hence the value of m =5 and value of n =2
Q = C.v
v = Q/C
v = 4 × 10^(-10)/250
= 4 × 10^(-10)/2.5 × 10^2
= 1.6 × 10^(-12) volt