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3 years ago

Matter and energy cycle around our ecosystem, are never being created or destroyed.

Physics

2 answers:

madreJ [45]3 years ago

6 0

Matter and energy cycle around our ecosystem are never being created or destroyed- true

andreyandreev [35.5K]3 years ago

4 0

Answer:

a) True

Explanation:

In a motion there are three things that are conserved, they are called momentum, angular momentum and emery. It is true for all isolated systems.

The conservation of energy principle states that "Energy can neither be created nor be destroyed but it is possible to convert one type of energy into another type of energy."

Based on this principle we can understand that the energy associated with matter is released into ecosystem when it is broken but energy is absorbed back from the ecosystem while binding matter together. The energy absorbed is called (binding energy). The mass itself is a type of energy.

So matter and energy are never being created or destroyed. They are the same since the beginning of universe.

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A 2kg hockey puck is sliding across the ice skating rink at 2 m/s. A player hits the puck so it's velocity increases to 10 m/s.

konstantin123 [22]

The work done on the puck is 96 J

Explanation:

According to the work-energy theorem, the work done on the hockey puck is equal to the change in kinetic energy of the puck.

Mathematically:

$W=K_f -K_i= \frac{1}{2}mv^2-\frac{1}{2}mu^2$

where

$K_f = \frac{1}{2}mv^2$ is the final kinetic energy of the puck, with

m = 2 kg being the mass of the puck

v = 10 m/s is the final speed

$K_i = \frac{1}{2}mu^2$ is the initial kinetic energy of the puck, with

u = 2 m/s being the initial speed of the puck

Substituting numbers into the equation, we find the work done by the player on the puck:

$W=\frac{1}{2}(2)(10)^2 - \frac{1}{2}(2)(2)^2=96 J$

Learn more about work and kinetic energy:

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6 0

3 years ago

Explain the difference between impulse and impulsive force?

ExtremeBDS [4]

An impulsive force is a force that is acting only during a short time, I mean, for an instant. Impulse is a physics magnitude define by the product of the impulsive force and the time that it was acting.

Is there any mistake in my English? Please, let me know.

7 0

3 years ago

The wavelength of light is given by the velocity divided by the frequency. the velocity of blue light is 300,000,000 m/sec, and

s2008m [1.1K]

<span>Electromagnetic radiation are represented in waves. Each type of wave has a certain shape and length. The distance between two peaks in a wave is called the wavelength. It is indirectly related to the frequency which is the number of wave that pass per unit of time. Wavelength is equal to the speed of light divided by the frequency. We calculate as follows:

Wavelength = </span>300,000,000 m/sec / <span>650,000,000,000,000 per second
Wavelength = 4.62x10^-4 m</span>

5 0

3 years ago

Read 2 more answers

A glass capillary tube with a diameter of 8.5 mm and length 8 cm is filled with a salt solution with a resistivity of 2.5 ?m. Wh

MA_775_DIABLO [31]

Answer:

The resistance is $3.5\times10^{-4}\ \Omega$