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svlad2 [7]
3 years ago
5

What is the mechanical energy of the cart on the right at position A. The

Mathematics
2 answers:
drek231 [11]3 years ago
6 0

Answer:

1800 J

Step-by-step explanation:

At point A when the cart is not in motion, it only has potential energy.

We know that potential energy is given by mgh where m is the mass of the cart, g is acceleration due to gravity and h is the height.

Substituting 12 kg for m, 10 m/s2 for g and 15 m for h then

PE= 12*10*15=1800 J

QveST [7]3 years ago
5 0

Answer:

1800

Step-by-step explanation:

P.E. =m.g.h = 12x10x15 = 1800 Joules

K.E/ = 1/2 mv2 = 1/2x12x02 = 0

P.E = 1800 | K.E. 0

M.E. = 1800 + 0 = 1800 Joules

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A house purchased for $230,000 has lost 6% of its value each year for the last four years. What is the house worth now?
lutik1710 [3]
You can use the compound growth to work this out,

Firstly you need to make a multiplier for -6%;
1-(6/100) = 0.94

The you times the amount of money by 0.94 to the power of 4 because you are working out 4 years:
230000*0.94^4 = 179527.26

The answer is $179527.26,
Hope this helps! :)
3 0
3 years ago
Steve opens a bank account with a simple annual interest rate of 5%. After four years, how much interest will Steve earn on an i
Marysya12 [62]

Steve will earn $160 interest after four years ⇒ 1st answer

Step-by-step explanation:

The formula of the simple interest is I = Prt, where

  • P is the initial deposit
  • r is the annual rate in decimal
  • t is the time of investment

∵ Steve opens a bank account with a simple annual interest rate of 5%

∴ r = 5% = 5 ÷ 100 = 0.05

∵ His initial deposit is $800

∵ He will put the money for four years

∴ t = 4

- Substitute all these values in the formula above

∵ I = 800(0.05)(4)

∴ I = 160

Steve will earn $160 interest after four years

Learn more:

You can learn more about the interest in brainly.com/question/13018049

#LearnwithBrainly

7 0
3 years ago
Read 2 more answers
Working alone, it takes Kristin 11 hours to harvest a field. Kayla can harvest the same field in 16 hours. Find how long it woul
viktelen [127]

Answer:

(11 hrs + 16 hrs)/2 = 13.5 hrs

13.5 hrs /2 = 6.75 hrs

8 0
3 years ago
Simplify 30! / 28!<br><br> Please post the correct answer. Don’t send links
viva [34]
The answer is
3 divided by 2
Hope this helped
5 0
3 years ago
A store sells a package of 25 trading cards for​ $5.25. Use pencil and paper. Explain how you can tell that the unit price per c
zzz [600]

Answer:

21 cent per card

Step-by-step explanation:

5.25 / 25 = .21

because 25 can be divided into the first 2 numbers

6 0
2 years ago
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