If length = a, width = b
if double both a and b will double its area?
area of a rectangle is ab
if double both a and b then the area is (2a)(2b) = 4ab (then peter is wrong because the area will be 4 times not double)

8 0

3 years ago

"There are 9 more children than parents in a room. There are 25 people in the room in all. How many children are there in the ro

Natasha2012 [34]

X = parents
x+9 = children

x + x + 9 = 25
2x = 25 - 9
2x = 16
x = 16/2
x = 8 parents

8 + 9 = 17 children

Unknowns in this problem are the number of parents and the number of children.

7 0

3 years ago

For installation with a 300-kVA, 3-phase transformer, a 480-volt primary, and a 240-volt secondary. Calculate the maximum overcu

Novay_Z [31]

By using the protection method for primary-only protection, the maximum overcurrent protection (MOCP) is equal to 451.59 Amperes.

In Electrical engineering, MOCP is an abbreviation for maximum overcurrent protection and it can be defined as the maximum allowable current rating that is required for any circuit breaker or fuse, in order to properly protect an electrical equipment, especially under uncertain or anticipated fault conditions.

Mathematically, the amount of current flowing through the primary winding of a three-phase transformer can be calculated by using this mathematical expression:

Current, I = 3-phase KVA/(1.73 × Voltage)

Substituting the given parameters into the formula, we have;

Current, I = 300,000/(1.73 × 480)

Current, I = 300,000/830.4

Current, I = 361.27 Amperes.

By using the protection method for primary-only protection, the maximum overcurrent with 25% above the current is given by:

Maximum overcurrent = 125% × Current

Maximum overcurrent = 125/100 × 361.27

Maximum overcurrent = 45,158.75/100

Maximum overcurrent = 451.5875 ≈ 451.59 Amperes.

Learn more about maximum overcurrent protection here: brainly.com/question/14284905

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6 0

1 year ago