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2 years ago

Write the first law of motion

Physics

2 answers:

Dima020 [189]2 years ago

7 0

Answer:

A object in rest will remain in rest and a object in motion will move at a constant pace and in a straight line unless a unbalanced force acts upon it

Explanation:

give brainliest if you'd like

Vaselesa [24]2 years ago

6 0

Newton's first law: the law of inertia

Newton's first law states that

if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.

hope you understand thank you.

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Why is creativity important in constructing specific methods?

Nat2105 [25]

Hi!

The correct option would be C.

<h3>Explanation:</h3>

Scientific method is the protocol in an experiment for a hypothesis that involves testing, measurement, observation and necessary modification of hypothesis during the course of the experiment. There are several manners and experiments that can be tested for the hypothesis, and plenty of ways to design an experiment.

Scientific experiments can be very tricky to design, owing to the numerous parameters and variables that need to be accounted for. Of course, there are some relatively simple experiments. Creativity is needed for all branches of science, because each field presents obstacles in discovery, and creativity allows for us to devise ways around those obstacles. Science has always tested humans ability to think outside the box and question their surroundings, and creativity has been the driving force.

Hope this helps!

4 0

3 years ago

A 29.0-kg block is initially at rest on a horizontal surface. A horizontal force of 71.0 N is required to set the block in motio

Julli [10]

Answer:

(a) $\mu_s=0.25$

(b) $\mu_k=0.20$

Explanation:

According to Newton's second law:

$\sum F_y:N=mg\\\sum F_x:F_a=F_f$

Recall that the frictional force is related jointly with the coefficient of friction and normal force $F_f=\mu N$ . Replacing in the above equation, we get the coefficient of friction:

$F_a=\mu N=\mu mg\\\mu=\frac{F_a}{mg}$

(a) The coefficient of static friction is related with the force required to set the block in motion:

$\mu_s=\frac{71N}{29kg*9.8\frac{m}{s^2}}\\\mu_s=0.25$

(b) The coefficient of kinetic friction is related with the force required to keep the block moving with constant speed:

$\mu_k=\frac{56N}{29kg*9.8\frac{m}{s^2}}\\\mu_k=0.20$

3 0

3 years ago

PLS HELP ASAP!!! <br> I don’t understand this at all

Mnenie [13.5K]

Answer:

The part that completes the nuclear equation is:

$^{221}_{87}Fr$

Explanation:

<h2>A) Preliminar explanation</h2>

The <em>nuclear equation</em> represents a nuclear reaction: the change of the nucleus of an atom.

The given equation represents an actinium atom releasing an alpha particle.

This is the meaning of each part of the equation:

Ac is the chemical symbol of actinium
The superscript to the left of the chemical symbol is the mass number of the atom (number of protons plus number of neutrons). The mass number is 225.
The subscript to the left of the chemical symbol is the atomic number of the atom (number of protons). The atomic number is 89.

$^4_2He$ is the symbol of the alpha particle. It is an atom of helium
The mass number is 4
The atomic number is 2

<h2>B) Solution</h2>

To <em>complete the nuclear equation </em>you must do two balances: mass number balance and atomic number balance.

<u>i) Mass number balance</u>

225 = A + 4 ⇒ A = 225 - 4 = 221

<u>ii) Atomic number balance</u>

89 = Z + 2 ⇒ Z = 89 - 2 = 87

Therefore, the mass number of the unknown atom is 221, and the atomic number is 87.

From a periodic table, the element with atomic number 87 is francium, Fr.

Now, you have the chemical symbol, the atomic number, and the mass number of the unknown atom, which lets you to write the atom that completes the <em>nuclear equation</em>.

$^{221}_{87}Fr$

7 0

4 years ago

How does absorption spectra occur?

Arlecino [84]

An absorption spectrum occurs when light passes through a cold, dilute gas and atoms in the gas absorb at characteristic frequencies; since the re-emitted light is unlikely to be emitted in the same direction as the absorbed photon, this gives rise to dark lines (absence of light) in the spectrum.

hope this helped :)

mark brainliest

3 0

4 years ago

A company is interested in buying a new machine to replace their outdated equipment. However, before committing to the purchase,

Helen [10]

The mechanical efficiency = actual work / ideal work

So ζ = 1540 / 1600 * 100% = 96.25%

8 0

4 years ago

Read 2 more answers

Write the first law of motion​

Write the first law of motion