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3 years ago

A 1000-kg car has 50,000 joules of kinetic energy. What is the speed?

Physics

2 answers:

bixtya [17]3 years ago

5 0

Answer:

½mv²= KE

½(1000)?²= 50000

500 500

? ²=100

Square root

?= 10

10 m/s is you answer

djyliett [7]3 years ago

4 0

K.E = 1/2mv^2

The kinetic energy is 50,000 J and the mass of the car is 10,000 kg.

50,000 J = 1/2(10,000kg)v^2
Solve for v (velocity)
50,000 J = 5,000 kg x v^2
10 = v^2
$\sqrt{10} = v$
about 3 m/s (in terms of significant figures)

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3 years ago

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muminat

Answer:

Explanation:

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3 years ago

What is the density of 18.0-karat gold that is a mixture of 18 parts gold, 5 parts silver, and 1 part copper? (These values are

nexus9112 [7]

Answer:

Density of 18.0-karat gold mixture is $15.58 g/cm^3$ .

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A mixture of 18 parts gold, 5 parts silver, and 1 part copper.

Let mass of gold be 18x

Let the mass of silver be 5x

Let the mass of copper be 1x

The density of gold = $19.32g/cm^3$

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The density of copper = $8.8g/cm^3$

$Volume=\frac{Mass}{Density}$

Volume of the gold in the mixture = $V_1=\frac{18x}{19.32 g/cm^3}$

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Volume of the copper in the mixture = $V_3=\frac{1x}{8.8 g/cm^3}$

Mass of the mixture = M = 18x+5x+1x =24x

Volume of the mixture = $V_1+V_2+V_3$

Density of the mixture:

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3 years ago

A person walks due south from point A for 500 yards and then due west for 300 yards, arriving at point B. Answer the following q

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The total displacement of the person walking from point A to point B is 300 yards.

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<h3>Pythagoras theorem in brief :</h3>

According to the Pythagorean Theorem, the square that represents the hypotenuse, or side of a right triangle that faces the right angle, is equal to the total of the squares on the triangle's legs.(or, in popular algebraic notation, $a^2 + b^2 = c^2$ ).