IDK IF IT'S B OR D! PLEASE HELP ASAP!!Notes played on a piano that have a higher amplitude sound _____ to us.
A. softer
B. louder
C. lower-pitched
D. higher-pitched

Answers

Answer 1

Answer: Amplitude ==> loudness (B)

Pitch ==> frequency

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With a slope of 6.4%A car starts at 0mph, and has a top speed of 203And has a base acceleration of 2.93ft/s2How long would it take to reach 12.42 miles
What the core muscles do and why it's important to have a strong set of core muscles.
Explain in your own words what the theory of evolution is.
How can light change matter
All of the following are true about hypotheses, except: A hypothesis is a question a scientist wants to research. A hypothesis is a statement that predicts what will be observed in an investigation. A hypothesis is based on background research performed by the scientist. A hypothesis is usually written in an if-then format that describes the proposed relationship between variables.

A golf ball reaches a height of 150 m before it stops rising and starts to fall to the ground. What is the golf balls speed (rounded to the nearest whole number) right before it hits the ground?

Answers

Answer:

v = 54 m/s

Explanation:

Given,

The maximum height of the flight of golf ball, h = 150 m

The velocity at height h, u = 0

The velocity of the golf ball right before it hits the ground, v = ?

Using the III equations of motion

v² = u² + 2gh

Substituting the given values in the above equation,

v² = 0 + 2 x 9.8 x 150 m

= 2940

v = 54 m/s

Hence, the speed of the golf ball right before it hits the ground, v = 54 m/s

Two substances were mixed and there was a color change and small flames. What can you infer happened?A physical property was observed
A chemical change occurred
A change in state from solid to liquid
Matter was destroyed

Answers

A chemical change occurred

Explanation:

There are two types of changes, physical changes and chemical changes:

A chemical change occurs when the nature of a substance changes, and new substances are formed. This occurs when the bonds between molecules in the reactants break, and they re-form into new substance. A change in the colors of the substance involved is, for example, a sign that a chemical change occurred
A physical change occurs when there is a change in state of a substance, but no new substances are formed. For instance, a physical change is the melting of ice, or the boiling of water, or the condensation of water..

In this problem, two substances are mixed and there is a color change and small flames. The color change indicates the formation of new substances, so a chemical change has occurred. Moreover, the presence of small flames indicates that a chemical reaction has occurred (burning of oxygen), so a new substance has formed, so this is another indication of a chemical change.

#LearnwithBrainly

Answer:

The answer is B. A chemical change occurred

Explanation:

I took the test and got the answer right

The Statue of Liberty is composed of copper. The smallest particle of any amount of copper is A)
an atom.

B)
an element.

C)
a compound.

D)
a molecule.

Answers

Option A, because the atom is the smallest molecule, it is the smallest particle containing copper as part of the copper family, which are the best conductors of electricity and is a transition metal with atomic number. With this metal is composed the statue of liberty.

Changes in the way atoms are ? together occur when compounds form

Answers

Atoms are basically tiny structures that make up everything. And a compound is something used in a scientific expirement. I don't get the question. You used improper grammar

Where in a star does fusion occur

Answers

Stars are powered by nuclear fusion in their cores, mostly converting hydrogen into helium. The production of new elements via nuclear reactions is called nucleosynthesis. A star's mass determines what other type of nucleosynthesis occurs in its core (or during explosive changes in its life cycle).

A student that jumps a vertical height of 50 cm during the hang time activity.a. What is the hang time of the student?
b. What speed must the student leave the ground with to reach that height?

Answers

The hang time of the student is 0.64 seconds, and he must leave the ground with a speed of 3.13 m/s

Why?

To solve the problem, we must consider the vertical height reached by the student as max height.

We can use the following equations to solve the problem:

Initial speed calculations:

$v_(f)^(2)=v_(o)^(2)+2*a*d$

At max height, the speed tends to zero.

So, calculating, we have:

$v_(f)^(2)=v_(o)^(2)+2*a*d\n\n0=v_(o)^(2)+2*(-9.81(m)/(s^(2)))*0.5m\n\nv_(o)^(2)=9.81(m^(2) )/(s^(2))\n\nv_(o)=\sqrt{9.81(m^(2) )/(s^(2))}=3.13(m)/(s)$

Hang time calculations:

We must remember that the total hang time is equal to the time going up plus the time going down, and both of them are equal,so, calculating the time going down, we have have:

$y-yo=vo.t+(1)/(2)*9.81(m)/(s^(2))*t^(2) \n\n0.5m-0=0*t+4.95*t^(2)\n\nt^(2)=(0.5)/(4.95)\n\nt=√(0.101)=0.318s$