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Umnica [9.8K]
3 years ago
14

6. Rank the following in terms of increasing kinetic energy:

Physics
2 answers:
bogdanovich [222]3 years ago
5 0
I'm doing dis greatest to least

1.C
2.A
3.D
4.B
Alborosie3 years ago
4 0

Answer:

B < D < A < C

Explanation:

Kinetic energy depends on the mass and the square of the velocity of the body. A body in motion has kinetic energy.

A. m = 12000 kg

v = 15 m/s

K.E. = 0.5 mv²

      = 0.5 (12000 kg) (15 m/s)²

      = 1,350,000 J

B. m = 10,000 kg

v = 0

K.E. = 0 J

C. m = 15 kg

v = 1000 m/s

K.E.=0.5 mv²

      = 0.5 (15 kg) (1000 m/s)²

      = 7,500,000 J

D. m = 100 kg

v = 5 m/s

K.E.=0.5 mv²

      = 0.5 (100 kg) (5 m/s)²

      = 250 J

In increasing order of kinetic energy:

B < D < A < C

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How is acceleration calculated?
steposvetlana [31]

Answer:

Acceleration is the change in velocity divided by time

Explanation:

This is the correct answer because distance divided by time is the position. Speed multiplied by time is the distance. And acceleration is not just velocity, but the change in velocity over time.

4 0
3 years ago
Read 2 more answers
dam is used to block the passage of a river and to generate electricity. Approximately 58.4 x 103 kg of water falls each second
mrs_skeptik [129]

Answer:

8.049 MW

Explanation:

The expression for gravitational potential energy is given as

Ep = mgh............. Equation 1

Ep = gravitational potential energy, m = mass of water, h = height, g = acceleration due to gravity.

Given: m = 58.4×10³ kg, h = 20.1 m, g = 9.81 m/s²

Substitute into equation 1

Ep =  58.4×10³(20.1)(9.81)

Ep = 1.6098×10⁷ J.

If one half the gravitational potential energy of the water were converted to electrical energy

Electrical energy = Ep/2

Electrical energy = (1.6098×10⁷)/2

Electrical energy = 8.049×10⁶ J

In one seconds,

The power generated = 8.049×10⁶ W

Power generated = 8.049 MW

3 0
3 years ago
A weather balloon is filled to a volume of 6000 L while it is on the ground, at a pressure of 1 atm and a temperature of 273 K.
avanturin [10]

Answer : The final volume of the balloon at this temperature and pressure is, 17582.4 L

Solution :

Using combined gas equation is,

\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}

where,

P_1 = initial pressure of gas = 1 atm

P_2 = final pressure of gas = 0.3 atm

V_1 = initial volume of gas = 6000 L

V_2 = final volume of gas = ?

T_1 = initial temperature of gas = 273 K

T_2 = final temperature of gas = 240 K

Now put all the given values in the above equation, we get the final pressure of gas.

\frac{1atm\times 6000L}{273K}=\frac{0.3atm\times V_2}{240K}

V_2=17582.4L

Therefore, the final volume of the balloon at this temperature and pressure is, 17582.4 L

4 0
3 years ago
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Help plzzzz thank youu
dybincka [34]
The answer is B I hope this helps luv
5 0
3 years ago
Explain why engineers leave a gap in a concrete bridge (answer must relate to density)
seraphim [82]
<span>Different materials expand and contract at different rates based on temperature. Just like if you leave a plastic bottle full of water in a freezer it will burst, but if you leave it partially full no problem.....Ok?Expansion joints do the same for bridges. There is a gap to allow for temperature related expansions and contractions. Sometimes you drive over bridges and roadways where this movement is constricted and you might notice a bumpy ride. Engineers can predict the variation of structural length based on span lengths and leave the necessary gaps.....btw, NICE QUESTION:)</span>


6 0
3 years ago
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