Physics: How fast is a 30 kg child runnning if her kinetic energy is 500 J?

How fast is a 30 kg child runnning if her kinetic

Ответ:

marchellepenuliar

16.03.2022

Physics

$\displaystyle v = 5.7735 \ m/s$

General Formulas and Concepts:

Math

Pre-Algebra

Order of Operations: BPEMDAS

Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to Right

Equality Properties

Physics

SI Units

Speed is m/s (meters per second)Energy is J (Joules), equal to 1 N/m (newton per meter)Mass is kg (kilograms)

Energy

Kinetic Energy Formula: $\displaystyle KE = \frac{1}{2} mv^2$

KE is Kinetic Energy (in J)m is mass (in kg)v is velocity (in m/s)Explanation:

Step 1: Define

Mass m = 30 kg

Kinetic Energy KE = 500 J

Step 2: Solve for v

Substitute [KEF]: $\displaystyle 500 = \frac{1}{2}(30)v^2$ Multiply: $\displaystyle 500 = 15v^2$ Isolate v term: $\displaystyle \frac{100}{3} = v^2$ Isolate v: $\displaystyle \frac{10\sqrt{3} }{3} = v$ Rewrite: $\displaystyle v = \frac{10\sqrt{3} }{3} \ m/s$ Evaluate: $\displaystyle v = 5.7735 \ m/s$

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Ответ:

dee3874

27.02.2021

Physics

Explanation:

Magnetic force, attraction or repulsion that arises between electrically charged particles because of their motion. It is the basic force responsible for such effects as the action of electric motors and the attraction of magnets for iron.

Magnetic forces can be used to aid humans through technology. Anything that is powered by electricity wouldn't work without magnets, because we use them to generate electricity.

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How fast is a 30 kg child runnning if her kinetic energy is 500 J?

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