Which of the following represents a chemical change? (1 point)

OSCilloscope shows wave starts cycle minimum 20 units reaches max of 100 units before completing 5 milliseconds what is relation

Vitek1552 [10]

Answer:

$T=0.02\ s$

$f=50\ Hz$

Explanation:

Given:

minimum amplitude at the start of oscillation cycle, $a_0=20\ unit$

the first maximum amplitude after the start of oscillation cycle, $a_{m1}=100\ units$

Time taken to reach from the first minima to the first maxima, $t=5\times 10^{-3}\ s$

As we know that an oscilloscope executes a wave cycle represented by a sine wave. So we can deduce that it has executed one-fourth of the cycle in going from the amplitude of 20 units to 100 units in 0.005 seconds.

<u>So the time taken to complete one cycle of the oscillation:</u>

$T=4\times 0.005$

$T=0.02\ s$ is the time period of the oscillation

<u>We know frequency:</u>

$f=\frac{1}{T}$

$f=\frac{1}{0.02}$

$f=50\ Hz$

6 0

3 years ago

Pleaswe help me ewwfea

Talja [164]

Answer:

The first one is Earths Tilt on its axis

6 0

3 years ago

Read 2 more answers

Which statement best describes why an island food web could be considered a closed system

iris [78.8K]

B. Energy enters and exits the system matter does not

Explanation:

In thermodynamics, there are three types of system:

Open system: it is a system that exchanges both matter and energy with the surroundings - an example is an open bottle
Closed system: it is a system that exchanges only matter with the surroundings, while energy cannot enter and exit the system - an example is a closed bottle (air cannot enter/exit the bottle, but heat can be exchanged through the walls of the bottle)
Isolated system: it is a system that cannot exchange matter or energy with the surroundings - an example is a sealed thermic container (heat cannot pass through the walls)

In this problem, we are asked to identify which statement best describes the island food web as a closed system: based on the definitions above, we can say that the correct option is

B. Energy enters and exits the system matter does not

Learn more about thermodynamics:

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#LearnwithBrainly

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3 years ago

If vector y = 21cm and vector Z=75 cm, what is vector x ?

pychu [463]

That depends on how 'x' is related to 'y' and 'z' ... like the angles between all of them, and whether they're all on the same planet. A drawing would sure help.

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4 years ago

A uniform solid disk of radius 1.60 m and mass 2.30 kg rolls without slipping to the bottom of an inclined plane. If the angular

bagirrra123 [75]

To solve this problem we will use the concepts related to energy conservation. Both potential energy, such as rotational and linear kinetic energy, must be conserved, and the gain in kinetic energy must be proportional to the loss in potential energy and vice versa. This is mathematically

$PE = KE_{lineal} + KE_{rotational}$