You notice that heat is released during a chemical reaction. This reaction is a(n) _______ reaction. endothermic heat hot exothermic

Answers

Answer 1

Answer: The reaction is an exothermic reaction.

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Julie finds a snail on the sidewalk and wants to know whether or not the snail moves throughout the day. She places a single mark on the sidewalk next to the snail.What will Julie use the mark for initially?

Answers

To make a base line mark to know where she started measuring the snails movement, at the end of the day she can measure from her first line to her last to see how far the snail went.
Hope this helped!

Answer:

To check the movement of the snail.

Explanation:

the answer was right :)

Within a single use of the scientific method, which of the following steps can only be performed afterdata is collected?
A. Controls and variables are chosen.
B. The initial experiment is designed.
C. The initial hypothesis is formed.
D. Conclusions are drawn.

Answers

Within a single use of the scientific method, the step which would be performed after we collect data, would be the drawing of a conclusion out of the answers that you've presented - D.

It is usually the case that you first have to analyze the data after you've gather it and then you base your conclusions on it. This isn't, however, always the case.

Brody and Ethel are arguing about waves. Brody says that waving his hand back and forth is a scientific wave. Ethel says that it is not. Which statement best describes who is correct? -Brody is correct because the wave involves an input of energy. -Ethel is correct because energy is not carried from one place to another. -Brody is correct because the pattern repeats. -Ethel is correct because the motion has no pattern. Also... Khalad is measuring the amplitude of a wave. What can be known about this wave? -It is a sound wave. -It is a transverse wave. -It is an electromagnetic wave. -It is a mechanical wave.

Answers

In the first question, the answer would be the statement 'Brody is correct because the wave involves an input of energy'. The hand wave involves an input of energy and this energy is repeated and is carried from one place to another.

For the next question, the answer would be 'it is a transverse wave' because all are transverse waves.

Answer:

Ethel is correct because energy is not carried from one place to another.

It is a transverse wave.

Explanation:

During the propagation of waves from one point or place to another, energy is being transferred. Thus, when one's hand is being waved, there is no transfer of energy from one point to another. Therefore, Ethel is right while Brody is wrong.

A transverse wave is known as a type of wave that the direction of propagation is perpendicular to the vibration of the medium. Therefore, the wave is a transverse wave.

Comic strip hero Superman meets an asteroid in outer space and hurls it at 100 m/s. The asteroid is on thousand times more massive than superman is. In the strip, superman is seen at rest after the throw. Taking physics into account, what would be his recoil speed?

Answers

Answer:

Recoil speed = -100,000 m/s

Explanation:

First, this is an exercise that has relation with angular momentum.

So, you need to use the expressions for momentum.

Now, we can assume that Superman and the asteroid are initially at rest, so both moments are 0.

If superman hurls the asteroid, this means that he should have an equal moment but in the opposite direction of the asteroid, therefore, he also have an opposite recoil moment.

The expression to use is the following:

innitial momentum = final momentum

The final momentum, is the combination of superman recoil moment, and the asteroid so:

0 = Mass * Velocity

Let M1 and V1 be the mass and velocity of superman, while M2 and V2 would be the asteroid, thus we have:

0 = M1 * V1 + M2 * V2

As the problem states, the asteroid is 1000 times more massive than superman, so we can say that M2 = 1000M1. Replacing in the above expression we finally have:

0 = M1 * V1 + 1000M1 * V2

M1 * V1 = -1000M1V2 -----> Simplify M1

V1 = -1000V2

V1 = -1000 * 100

V1 = -100,000 m/s

This would be the recoil speed of Superman.

Answer:

-100,000m/s

Explanation:

A flywheel with a moment of inertia of 1.00kg m^2 is rotating at 100 rpm. What torque is required to bring it to rest in 10.0 revolutions?

Answers

Torque is defined as the turning effect of force about the axis of rotation. In short it is a moment of force. It is represented by τ. The amount of torque required to produce an angular acceleration depends on the distribution of the mass of the object. It is calculated as follows:

torque = (moment of inertia)(angular acceleration)
torque = 1.00 ( 100 )(1/60) / 10
torque = 0.1667 N∙m

A scientific model is based on assumptions that limit where and how the model can be applied. True False

Answers

Answer:

i think it is true

Explanation:

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