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2 years ago

What does Newton's first law of motion tell us about velocity?

1 answer:

6 0

Every body continues in a state of rest or uniform motion in a straight line unless acted on by a resultant external force. That's approximately Newton's first law of motion.
So, the velocity of something tends to remain the same, unless an external force changes it. This is sometimes called "inertia". A body at rest, as in with "no velocity" will tend to remain at rest, unless there's a force on it. inertia again.

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Which of the following correctly describes the hierarchy that exists in the universe? (3 points)

r-ruslan [8.4K]

Answer:

Explanation:

A solar system is a collection of planets, their moons, and other objects in orbit around a central star.

5 0

3 years ago

Why does a lone pair of electrons occupy more space around a central atom than a bonding pair of electrons?

Inessa [10]

Answer:

The lone pair of electrons occupy more space because the electrostatic force becomes weaker.

Explanation:

When there is a bond pair of electrons in the 2 positively charged the atomic nuclei draw the electron density towards them, thereby reducing the bond diameter.

In the case of the lone pair, only 1 nucleus is present, and the enticing electrostatic force becomes weaker and the intensity of the electrons will be increases. Therefore, the lone pair occupies more space than the pair of bonds.

5 0

2 years ago

Terry dropped a pebble from the top of his apartment building. The pebble impacted the ground after falling for 2.2 seconds. Cal

Contact [7]

The final velocity of the pebble as it hits the ground is 21.5 m/s.

We have to use the equation;

v = u + gt

Where;

v = final velocity

u = initial velocity

g = acceleration due to gravity

t = time

Since the pebble was dropped from a height, u =0 m/s, hence,

v = gt

v = 9.8 ms-2 × 2.2 s

v = 21.5 m/s

Learn more about velocity: brainly.com/question/8898885

6 0

2 years ago

W=fd <br> Solve for F <br> Then it asks the same question but to solve next time for D

djyliett [7]

W = fd Divide both sides by d
$\frac{w}{d}$ = f Switch the sides to make it easier to read
f = $\frac{w}{d}$

w = fd Divide both sides by f
$\frac{w}{f}$ = d Switch the sides to make it easier to read
d = $\frac{w}{f}$

6 0

2 years ago

Read 2 more answers

(1 point) find the half-life (in hours) of a radioactive substance that is reduced by 1010 percent in 9595 hours.

Bad White [126]

The decay function is of the form
$N(t) = N_{0} \, e^{-kt}$
where
N₀ = initial amount
k = decay constant
t = hours

The material decays by 10% in 95 hours. Therefore
$0.9N_{0} = N_{0} \, e^{-95k} \\\\ -95k = ln(0.9) \\\\ k= \frac{ln(0.9)}{-95}=0.001109$

The time for the half life is given by
$0.5N_{0} = N_{0} \, e^{-0.001109t} \\\\ -0.0001109t = ln(0.5) \\\\ t = \frac{ln(0.5)}{-0.001109} = 625 \, h$

Answer: The half life is 625 hours

8 0

3 years ago