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4 years ago

6

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

2 answers:

madreJ [45]4 years ago

6 0

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

andreyandreev [35.5K]4 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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Monica [59]

Answer:

im pretty sure it is C. Insulation

Explanation:

because it says reduced, and basically ur insulating the fire.

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4 years ago

Can u find the . in this?

nikklg [1K]

Answer:

Yeah it's right there from the one next to the exclamation point

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3 years ago

Read 2 more answers

An AM radio transmitter broadcasts 63.2 kW of power uniformly in all directions. (a) Assuming all of the radio waves that strike

egoroff_w [7]

Answer:

Intensity of the transmitted radio wave is 5.406 x 10⁻⁶ W/m²

Explanation:

Given;

power of radio transmitter, P = 63.2 kW = 63200 W

distance of transmission, r = 30.5 km

Intensity of the transmitted radio wave is calculated as follows;

$I = \frac{P}{4\pi r^2}$

where;

I is the intensity of the transmitted radio wave

Substitute the given values and calculate the intensity of the transmitted radio wave;

$I = \frac{P}{4\pi r^2} = \frac{63200}{4\pi (30500)^2} = 5.406 *10^{-6} \ W/m^2$

Therefore, Intensity of the transmitted radio wave is 5.406 x 10⁻⁶ W/m²

6 0

3 years ago

A 2-kg object is moving horizontally across a frictionless surface with a speed of 4 m/s. How much force is required to keep the

FinnZ [79.3K]

Answer:

none

Explanation:

Newton's first law says an object in motion will stay in motion at the same speed and direction unless acted upon by some force.

No force is necessary for the object to keep its speed and direction on a frictionless surface.

8 0

3 years ago

You are driving to the grocery store at 20 m/s. You are 110m from an intersection when the traffic light turns red. Assume that

oksano4ka [1.4K]

As we know that reaction time will be

$t = 0.50 s$

so the distance moved by car in reaction time

$d = vt$

$d = 20 \times 0.50$

$d = 10 m$

now the distance remain after that from intersection point is given by

$d = 110 - 10 = 100 m$

So our distance from the intersection will be 100 m when we apply brakes

now this distance should be covered till the car will stop

so here we will have

$v_f = 0$

$v_i = 20 m/s$

now from kinematics equation we will have

$v_f^2 - v_i^2 = 2 a d$

$0 - 20^2 = 2(a)100$

$a = \frac{-400}{200} = -2 m/s^2$

so the acceleration required by brakes is -2 m/s/s

Now total time taken to stop the car after applying brakes will be given as

$v_f - v_i = at$

$0 - 20 = -2 (t)$

$t = 10 s$

total time to stop the car is given as

$T = 10 s + 0.5 s = 10.5 s$

3 0

3 years ago