Answer:
''
Explanation:
A chemical change results from a chemical reaction, while a physical change is when matter changes forms but not chemical identity. Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding. Often, physical changes can be undone, if energy is input.
Magnetic field<span> strength does not incur force.</span>Magnetic flux<span> density does. In another analogy, it's similar to the relationship </span>between<span> electric </span>field<span>intensity (E) and electric </span>flux<span> density (D), except backwards. Electric </span>field<span> intensity is a measure of force,</span>
The kinetic energy of the car is
Explanation:
The kinetic energy of an object is the energy possessed by the object due its motion. It is given by
where
m is the mass of the object
v is its speed
For the car in this problem, we have:
m = 1000 kg is its mass
v = 30 m/s is its speed
Substituting into the equation, we find the kinetic energy of the car:
Learn more about kinetic energy:
brainly.com/question/6536722
#LearnwithBrainly
Steel is more dense because it’s heavy while water is light
Answer:
v₀ = 9,798 ft / s
Explanation:
We can solve this problem with kinematics in one dimension, when the train stops the speed is zero, the acceleration is negative so that the train stops. Let's use the equation
v² = v₀² - 2 a d
v = 0
v₀ = √2 a d
In the problem it indicates that the acceleration is g / 2, we substitute
v₀ = √2 (g / 2) d
Let's calculate
v₀ = √ 2 32/2 3 = √32 3
v₀ = 9,798 ft / s