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2 years ago

Earth's crust is formed during and destroyed by .

Physics

2 answers:

schepotkina [342]2 years ago

6 0

Answer:

The first one is seafloor spreading and the second is subduction

Explanation:

Sedaia [141]2 years ago

3 0

Answer: sea floor spreading and subduction

Explanation: hopes this helps :)

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What is the largest particle size that a stream can transport at a velocity of 5 centimeters per second?

laila [671]

Sand. sand is much lighter and can be carried further

3 0

3 years ago

4. A 70.0 kg boy and a 45.0 kg girl use an elastic rope while engaged in a tug-of-war on an icy,

marta [7]

Answer:

$a_1 = 1.446m/s^2$

Explanation:

Given

$m_1 = 70.0kg$ -- Mass of the boy

$m_2 = 45.0kg$ -- Mass of the girl

$a_2 = 2.25m/s^2$ -- Acceleration of the girl towards the boy

Required

Determine the acceleration of the boy towards the girl ( $a_1$ )

From the question, we understand that the surface is frictionless. This implies that the system is internal and the relationship between the given and required parameters is:

$m_1 * a_1 = m_2 * a_2$

Substitute values for $m_1, m_2$ and $a_2$

$70.0 * a_1 = 45.0 * 2.25$

Make $a_1$ the subject

$\frac{70.0 * a_1}{70.0} = \frac{45.0 * 2.25}{70.0}$

$a_1 = \frac{45.0 * 2.25}{70.0}$

$a_1 = \frac{101.25}{70.0}$

$a_1 = 1.446m/s^2$

<em>Hence, the acceleration of the boy towards the girl is 1.446m/s^2</em>

7 0

3 years ago

A Porsche challenges a Honda to a 200-m race.Because the Porsche's acceleration of 3.5 m/s2 is larger than the Honda's 3.0 m/s2,

Blizzard [7]

Answer:

Honda won by 0.14 s

Explanation:

We are given that

Distance =S=200 m

Initial velocity of Honda=u=0m/s

Initial velocity of Porsche=u'=0m/s

Acceleration of Honda= $3.0m/s^2$

Acceleration of Porsche's= $3.5m/s^2$

Time taken by Honda to start=1 s

$s=ut+\frac{1}{2}at^2$

Substitute the values

$200=0(t)+\frac{1}{2}(3)t^2$

$200=\frac{3}{2}t^2$

$t^2=\frac{200\times 2}{3}=\frac{400}{3}$

$t=\sqrt{\frac{400}{3}}=11.55s$

Time taken by Honda=11.55 s

Now, time taken by Porsche

$200=\frac{1}{2}(3.5)t^2$

$t^2=\frac{200\times 2}{3.5}$

$t=\sqrt{\frac{400}{3.5}}=10.69 s$

Total time taken by Porsche=10.69+1=11.69 s

Because it start 1 s late

Time taken by Honda is less than Porsche .Therefore, Honda won and

Time =11.69-11.55=0.14 s

Honda won by 0.14 s

3 0

3 years ago

(4. A bus is moving at 25 m/s when the driver steps on the brakes and brings the bus to a stop in

zlopas [31]

Answer:

(a) the average acceleration of the bus while braking is 8.333 m/s

(b) if the bus took twice as long to stop, the acceleration will be half of the value obtained in part a. [¹/₂ (8.333 m/s) = 4.16 s]

Explanation:

Given;

initial velocity of the bus, v = 25 m/s

time of the motion, t = 3 s

(a) the average acceleration of the bus while braking

a = dv/dt

where;

a is the bus acceleration

dv is change in velocity

dt is change in time

a = 25 / 3

a = 8.333 m/s

(b) If the bus took twice as long to stop, the duration = 2 x 3s

a = 25 / (2 x 3s)

a = ¹/₂ x (25 / 3)

a = ¹/₂ (8.333 m/s) = 4.16 s

Thus, if the bus took twice as long to stop, the acceleration will be half of the value obtained in part a.

6 0

4 years ago

What is the acceleration of a boy on a skateboard if the unr

Alex777 [14]

Answer:

0.26 m/s^2

Explanation:

We're asked to find the acceleration of a body given the net force acting on it and it's mass.

To do this, we use Newton's second law.

8 0

3 years ago

Read 2 more answers

Earth's crust is formed during ______ and destroyed by ______.

Earth's crust is formed during and destroyed by .