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anzhelika [568]

1 year ago

5

An amusement park ride spins you around in a circle of radius 2.5 m with a speed of 8.5 m/s. If your mass is 75 kg, what is the

centripetal force acting on you? A. 1530 N B. 2168 N C. 255 N D. 2359 N

2 answers:

nataly862011 [7]1 year ago

8 0

B is the correct answer - APEX

zhannawk [14.2K]1 year ago

3 0

B is the answer to this truly did the math

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A spring with spring constant 450 N/m is stretched by 12 cm. What distance is required to double the amount of potential energy

snow_lady [41]

Answer:

<em> The distance required = 16.97 cm</em>

Explanation:

Hook's Law

From Hook's law, the potential energy stored in a stretched spring

E = 1/2ke² ......................... Equation 1

making e the subject of the equation,

e = √(2E/k)........................ Equation 2

Where E = potential Energy of the stretched spring, k = elastic constant of the spring, e = extension.

Given: k = 450 N/m, e = 12 cm = 0.12 m.

E = 1/2(450)(0.12)²

E = 225(0.12)²

E = 3.24 J.

When the potential energy is doubled,

I.e E = 2×3.24

E = 6.48 J.

Substituting into equation 2,

e = √(2×6.48/450)

e = √0.0288

e = 0.1697 m

<em>e = 16.97 cm</em>

<em>Thus the distance required = 16.97 cm</em>

6 0

2 years ago

Which two pieces of data indicate that Uranus resides in the outer region of the solar system

LuckyWell [14K]

Answer:

Our solar system has total eight planets out of which four are inner planets and four are outer planets. The four outer planets are Jupiter, Saturn, Uranus and Neptune. The common characteristics of outer planets is that they are gaseous planets. They are larger on size than the inner rocky planets and are faraway from Sun. They have larger period of revolution around the Sun.

Uranus is a gaseous planet and lies far from Sun and hence has large period of revolution. It takes 84 Earth years to revolve around Sun. This data indicates that Uranus resides in the outer region of the Solar System.

4 0

2 years ago

he chemical method of analysis in determination of the blood alcohol content (%BAC) is: K2Cr2O7 + H2SO4 + C2H5OH → Cr2(SO4)3 + K

emmasim [6.3K]

Explanation:

Stoichiometric coefficients : these are the numeral which written before the chemical symbol of the chemical substance in a balanced chemical reaction.

We are given with the chemical equation which is used in blood alcohol content.The balanced chemical equation will be given as:

$2K_2Cr_2O_7 + 8H_2SO_4 + 3C_2H_5OH\rightarrow 2Cr_2(SO_4)_3 + 2K_2SO-4 + 3CH_3COOH + 11H_2O$

The stoichiometric coefficient of potassium dichromate = 2

The stoichiometric coefficient of sulfuric acid= 8

The stoichiometric coefficient of ethanol= 3

The stoichiometric coefficient of potassium sulfate = 2

The stoichiometric coefficient of chromium(III) sulfate = 2

The stoichiometric coefficient of acetic acid = 3

The stoichiometric coefficient of water = 11

3 0

1 year ago

A crane uses a block and tackle to lift a 2200N flagstone to a height of 25m

Cloud [144]

Remember the headline: ENERGY IS NEVER CREATED OR DESTROYED

The amount of energy before and after are always equal. All we ever do with energy is move it around from one place to another.

a). A crane can't create energy. Lifting the same rock in 20 different ways always takes the <u><em>same amount of work</em></u>. It doesn't matter whether one person picks the rock straight up, or 50 people get around it and lift it, or roll it up a ramp, or lift it with 16 pulleys and a mile of rope, or use a giant steam crane.

You want to lift a 2200N weight up 25m, you're going to have to supply

(2200N) x (25m) = <em>55,000 Joules</em> of work.

c). YOU put out 55,000 Joules of energy. It had to GO someplace. Where is it now ? ===> It's the potential energy the rock has now, from being 25m higher than it was before. That <em>55,000 Joules</em> is NOW the potential energy of the rock.

No energy was created or destroyed. It just got moved around.

55,000 Joules of energy began as nuclear energy in the core of the sun. Solar radiation carried it to the Earth. Plants absorbed it, and stored it as chemical energy. You ... or a cow that you ate later ... ate the plants and took the chemical energy. One way or the other, the chemical energy got stored in your blood and fat. When you needed to put it out somewhere, you moved it into your muscles, and they converted it into mechanical energy. Then you used the mechanical energy to exert forces. Today, you used the original 55,000 joules to lift the flagstone, and NOW that energy is in the flagstone, 25 meters up off the ground !

6 0

2 years ago

a catcher picks up a baseball from the ground, if the unbalanced force on the ball is 7.25 x 10^-2 N and 4.35 x 10^-2 J of work

omeli [17]

<span>The work is being done against gravity, and equals (Force * vertical distance).
A Joule of work is equivalent to 1 Newton-metre

So vertical distance d = work done / Force
d = 4.35*10^-2J / 7.25*10^-2 N = 0.6 m = 60cm = 600mm </span>

6 0

2 years ago