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anyanavicka [17]
3 years ago
13

An engine raises 120kg of water through a height of 40m in 30s what is the power of the engine?(g=10m/s2​

Mathematics
2 answers:
oee [108]3 years ago
7 0

Answer:

4800J/s

Step-by-step explanation:

m = 120kg

H = 40m

t = 30sec

Input energy = 120 × g × H = mgn

Ei  = 120 × 40 × 30 = 144000J

Energy per sec, E1  = 144000  ÷ 30 = 4800J/s

Power input = 4800J/s  

lutik1710 [3]3 years ago
3 0

Answer:

4800J/s

Step-by-step explanation:

good luck have a nice day

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Tony has 23 gallon of milk. He wants to equally share the milk between 3 milkshakes. Which expression represents the amount of m
DiKsa [7]

Answer:

Amount of milk in each milkshake = 7 2/3 gallons

Step-by-step explanation:

Gallons of milk = 23 (given)

Number of Milkshakes = 3

Because the gallons of milk were shared equally,

Amount of milk in each milkshake = 23/3 = 7 2/3 gallons of milk

5 0
3 years ago
PLEASE HELP QUICK!! WILL OFFER 100 POINTS TO THE FIRST ONE THAT ANSWERS
Reil [10]

Given

x+1 = \sqrt{7x+15}

We have to set the restraint

x+1\geq 0 \iff x \geq -1

because a square root is non-negative, and thus it can't equal a negative number. With this in mind, we can square both sides:

(x+1)^2=7x+15 \iff x^2+2x+1=7x+15 \iff x^2-5x-14 = 0

The solutions to this equation are 7 and -2. Recalling that we can only accept solutions greater than or equal to -1, 7 is a feasible solution, while -2 is extraneous.

Similarly, we have

x-3 = \sqrt{x-1}+4 \iff x-7=\sqrt{x-1}

So, we have to impose

x-7\geq 0 \iff x \geq 7

Squaring both sides, we have

(x-7)^2=x-1 \iff x^2-14x+49=x-1 \iff x^2-15x+50 = 0

The solutions to this equation are 5 and 10. Since we only accept solutions greater than or equal to 7, 10 is a feasible solution, while 5 is extraneous.

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3 years ago
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Sorry I'm gonna take a guess.......... d?
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3 years ago
How do i find sin^-1(cos(pi)) and answer in radians in terms of pi
vaieri [72.5K]
We have to find sin^(-1) ( cos π ).
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sin ^
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The length of a rectangular field is 4 m longer than its width.
Artyom0805 [142]
We know the perimeter is the sum of all sides. So lenght+length+width+width = 2length+2width.
Let's call the width x. If the length is 4m longer, then it's x+4.
We know the perimeter, so we can make an equation:
56=2x+2(x+4)
And solve from there:
56=2x+2x+8
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The width, which is x, is 12 m. And the length, x+4, is 16 m.
You can check this is correct by calculating the perimeter using those values: 12+12+16+16=56.
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