What is a complete wave?

Answers

Answer 1

Answer: One crest of a wave to another.

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3. You shoot an arrow straight up into the air with a velocity of 25 m/s.a. What is the velocity of the arrow at its peak?
b. How high did the arrow go?
c. How long is the arrow in the air?

Answers

a) The velocity of the arrow at its peak is zero

b) The maximum height of the arrow is 31.9 m

c) The time of flight is 5.10 s

Explanation:

The motion of the arrow fired straight upward into the air is a uniformly accelerated motion, with constant acceleration $g=9.8 m/s^2$ (acceleration of gravity) towards the ground.

The initial velocity of the arrow when it is fired is upward: since the acceleration is downward, this means that as the arrow moves upward, its velocity decreases in magnitude.

Eventually, at some point, the velocity of the arrow will become zero, and then it will change direction (downward) and will start increasing in magnitude. The moment when the velocity raches zero corresponds to the peak of the trajectory of the arrow: therefore, at the peak the velocity is zero.

Since the motion of the arrow is a uniformly accelerated motion, we can use the following suvat equation:

$v^2-u^2=2as$

where

v is the final velocity

u is the initial velocity

a is the acceleration

s is the displacement

For the arrow, we have:

u = 25 m/s

v = 0 (when the arrow reaches the peak)

$a=g=-9.8 m/s^2$ (negative because downward)

s is the maximum height reached by the arrow

And solving for s,

$s=(v^2-u^2)/(2a)=(0-(25)^2)/(2(-9.8))=31.9 m$

In order to find the time it takes for the arrow to reach the maximum height, we use the following suvat equation:

$v=u+at$

where here we have:

v = 0 is the final velocity at the peak

u = 25 m/s

$a=g=-9.8 m/s^2$

And solving for t,

$t=-(u)/(g)=-(25)/(-9.8)=2.55 s$

This is the time the arrow takes to reach the top of the trajectory: therefore, the total time of flight is twice this value,

$T=2t=2(2.55)=5.10 s$

Learn more about accelerated motion:

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What is the unit for electric charge?
Kilogram
Newton
Electron
Coulomb

Answers

Answer:coulomb

Explanation:

The unit of electric charge is coulomb

Answer:

Coulomb.

Explanation:

A transverse wave has an amplitude of 2.4m. What is the vertical distance, in meters, between the top of a Crest and the bottom of a Trough?

Answers

Answer:

4.8 m

Explanation:

A transverse wave is a wave in which the oscillation of the particles occur in a direction perpendicular to the direction of motion of the wave.

The amplitude of a transverse wave is the maximum displacement of the wave with respect to the equilibrium position.

The crest of a wave is the position of maximum displacement on the positive side, while the trough of a wave is the position of maximum displacement on the negative side.

This means that the amplitude of a wave is equal to the distance between a crest (or a trough) and the equilibrium position.

Therefore, we have:

$d=2A$

where:

d is the distance between the top of a crest and the bottom of a trough

A is the amplitude of the wave

Here we have:

A = 2.4 m

So, we find

$d=2\cdot 2.4 = 4.8 m$

Eva is in a closed, dark room. She uses her arm muscles to turn on a lamp. When she moves her hand closer to the lamp, the light heats her hand. The light bounces off the pages of a book and into her eyes.If this room is a closed system, what happens to the total amount of energy in the room?

A.
It remains constant.

B.
It decreases.

C.
It increases, then decreases.

D.
It increases.

Answers

Well, we know that the total energy in a closed system remains constant.

The problem with the story of Eva is that she is not in a closed system.
If the dark room were really a closed system, then she could press the
button or turn the switch all day, and the lamp could not light. It needs
electrical energy coming in from somewhere in order to turn on.

Let's say that Eva used her arm muscles to strike a match and light the
candle on the table. Then we would have have food energy, muscle
energy, chemical energy in the match, chemical energy in the candle,
heat and light energy coming out of the candle, heat energy soaking into
her hand, light energy bouncing off of the book and into her eyes ... all
going on during the story, and the sum total of all of them would remain
constant.

Its a tricky one but my guess would be D if she turned on the lamp causing energy if would have increased the amount in the specificed room x

This question kind of complicated for me

Answers

I'm pretty sure it's frying an egg because you can't un-fry the egg

number 3 is frying a egg

Identify two ways of changing the strength of an electric force

Answers

When you talk about "the strength of an electric force" in middle school, I'm pretty sure you're talking about the force between two electrostatic charges that either pulls them together or pushes them apart.

The strength of that force depends on

-- the product of the amounts of charges on the two charged objects

-- the distance between the centers of their charges.

magnetism and an increase/decrease in temperature

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