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finlep [7]
2 years ago
9

a crane lifts a 450 kg concrete to the top of a 50 m building in 5 s. assuming g=10 m/s² calculate a) the potential energy of th

e concrete B):- the power developed by the crane​
Mathematics
1 answer:
Juliette [100K]2 years ago
5 0

Answer:

Step-by-step explanation:

The work done changes the potential energy

ΔPE = mgΔh = 450(10)(50) = 225,000 = 225 kJ

power is the rate of doing work

P = 225000/5 = 45000 W = 45 kW

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Sedaia [141]

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(9-6)/(3-1)=

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7 0
3 years ago
Find the exact trigonometric value:<br> sin 255
wariber [46]

Answer:

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Step-by-step explanation:

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6 0
2 years ago
Read 2 more answers
The length of a rectangular garden is 5 times its width.
Delvig [45]

Answer:

  • 10 m and 50 m

Step-by-step explanation:

<h3>Given</h3>
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  • A = 500 m²
<h3>To find</h3>
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<h3>Solution</h3>

Area formula

  • A = lw
  • A= 5w*w= 5w²
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  • w = √100
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Then

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3 0
2 years ago
The weight of each cookie in a batch of a certain type of commercially produced cookie follows an approximately normal distribut
melisa1 [442]

Answer:

Around 34.14% of the cookies are between 11.32 and 11.35 grams.

Step-by-step explanation:

In a normal distribution around 68.28% of the values are around minus one to one standard deviation. In this case we want to know the percentage of values that are between zero and one standard deviation, therefore the percentage of values that are in that range is given by 68.28% / 2 , which is equal to 34.14%.

7 0
2 years ago
18x = ~36?
FromTheMoon [43]

Answer:

from the picture the answer is D.

Step-by-step explanation:

2 \ti4mes \f7rac{?}{?}

to find x subtract 18x from 4x which will give you -14x=-36

divide both sides by -14

4 0
2 years ago
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