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3 years ago

Rocks from volcanoes are used by scientists to study the interior of the earthTRUE OR FALSE

2 answers:

7 0

True, rocks are made from hardened magma from the Earth’s interior. By studying them you can find out a lot about the interior.

I had a carved lava rock necklace when I was a kid & lived in Hawaii. My sister & I developed a rash from wearing the lava rock pendant. We think it was because there was a high level of sulfur in the lava rock.

If you have ever been near an active volcano, the smoke/ steam gives off a smell of sulfur, which smells like rotten

cupoosta [38]3 years ago

6 0

I think it’s false bc A volcano is not in the interior of the earth

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An airplane travels 1200 km in 90 minutes. What is the average speed in m/s for this trip?

gladu [14]

Answer:

the answer is 1333.33m/s

3 0

3 years ago

A bicycle rider has a speed of 20.0 m/s at a height of 60 m above sea level when he begins coasting down hill. Sea level is the

IRINA_888 [86]

Answer:

The rider's speed will be approximately 35 m/s

Explanation:

Initially the rider has kinetic and potential energy, and after going down the hill, some of the potencial energy turns into kinetic energy. So using the conservation of energy, we have that:

$kinetic_1 + potencial_1 = kinetic_2 + potencial_2$

The kinetic and potencial energy are given by:

$kinetic = mass * speed^2 / 2$

$potencial = mass * gravity * height$

So we have that:

$m*v^2/2 + mgh = m*v'^2/2 + mgh'$

$20^2/2 + 9.81*60 = v'^2/2 + 9.81*18$

$v'^2/2 + 176.58 = 788.6$

$v'^2/2 = 612.02$

$v'^2 = 1224.04$

$v' = 34.99\ m/s$

So the rider's speed will be approximately 35 m/s

8 0

3 years ago

How much time is needed for a 15,000 W engine to do 1,800,000 J of work? (Power: P = W/t)

vovikov84 [41]

To solve for this we need to use the formula P = W/T (Power = Work/Time).
Since we do not have time, we shall switch up the formula.
Our new formula is T = W/P (Time = Work/Power).
We have 1,800,000 J of work, and 15,000 W of power.
1,800,000/15,000 = 120.
It will take 120 (insert measure of time here).
I hope this helps!

4 0

3 years ago

Read 2 more answers

Magnitude of force F experienced by a certain object moving with speed v is given by F=Kv race to 2, where K is constant. Find t

My name is Ann [436]

<h2>Answer:</h2>

MT⁻¹

<h2>Explanation:</h2>

Given equation:

F = Kv --------------(i)

Where;

F = Magnitude of force experienced by the object

v = speed at which the object is moving

K = constant.

To get the dimension of K, follow the following steps:

i. Make K subject of the formula in equation(i)

K = F / v

ii. Get the dimension of force F and speed v

Dimension of force = MLT⁻²

Dimension of velocity = LT⁻¹

iii. Substitute these dimensions into the result of (i) above;

K = MLT⁻² / LT⁻¹

iv. Simplify the result in (iii)

First, the Ls in the numerator and denominator will cancel out

K = MT⁻² / T⁻¹

Next, the Ts will be expressed as follows

K = MT⁻² x T¹ [using the law of indices]

K = MT⁻²⁺¹

K = MT⁻¹

Therefore, the dimension of K is MT⁻¹

6 0

3 years ago

A large box sits on a rough floor. A person pushes on the box with a horizontal force of magnitude 50 N. The box remains at rest

artcher [175]

Answer:

The magnitude of the frictional force is $F_f \ge 50 \ N$

Explanation:

From the question we are told that

The force exerted on the box is $F = 50 \ N$

Generally for the box to remain at rest then it means that the frictional force is greater than or equal to the force applied to move it i.e

$F_f \ge F$

=> $F_f \ge 50 \ N$

5 0

3 years ago

Rocks from volcanoes are used by scientists to study the interior of the earthTRUE OR FALSE​

Rocks from volcanoes are used by scientists to study the interior of the earthTRUE OR FALSE