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3 years ago

A machine puts out 100 watts of power for every 1000 watts put into it. The efficiency of the machine is

Mathematics

1 answer:

kogti [31]3 years ago

7 0

Answer:

10%

Step-by-step explanation:

Machine out put power =100 watt

Machine input power=1000 watt

We have to find the efficiency of the machine.

We know that

Efficiency of machine= $\frac{O.p}{I.p}$

Where O.p=Output power

I.p=Input power

By using the formula

Efficiency of machine= $\frac{100}{1000}=0.1$

Efficiency of machine (in percent) $0.1\times 100=$ 10%

Hence, the efficiency of machine=10%

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3 years ago

Which expressions are equivalent to 4m + 12? Choose ALL that apply.<br>

riadik2000 [5.3K]

Answer:

Step-by-step explanation:

Option 1:

4(m + 12) = 4m + 48 (not what we want)

Option 2:

6m - 2m + 12 = 4m + 12 (one of the right answers)

Option 3:

4(m + 3) = 4m + 12 (one of the right answers)

Option 4:

3m - m + 12 = 2m + 12 (not what we want)

Therefore the correct answers are Option 2 and Option 3.

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3 years ago

Read 2 more answers

If you multiply this number by 3 , then subtract 15 , the result is 51. What is the number?

bagirrra123 [75]

3x-15=51 3x=36 X= 12 Thus the number is 12

8 0

3 years ago

Spencer borrowed $50 from his cousin, who charged him 6% simple interest each year. If Spencer pays his cousin back 3 years late

Orlov [11]

Given:

Principal = $50

Rate of simple interest = 6%

Time = 3 years

To find:

The amount after 3 years.

Solution:

Formula for simple interest:

$I=\dfrac{P\times r\times t}{100}$

Where, P is principal, r is the rate of interest in percentage and t is the number of years.

Putting $P=50,\ r=6,\ t=3$ in the above formula, we get

$I=\dfrac{50\times 6\times 3}{100}$

$I=\dfrac{900}{100}$

$I=9$

Formula for amount is:

$A=P+I$

Where, P is principal and I is the simple interest.

Putting $P=50,\ I=9$ , we get

$A=50+9$

$A=59$

Therefore, the correct option is B.

4 0

3 years ago