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3 years ago

The rock cycle _____.

2 answers:

4 0

B is the answer you need and i honestly got this question on a middle school test

you must be in different area then me

Vesnalui [34]3 years ago

3 0

Answer:

B. Changes and recycles Earth's rocks.

Explanation:

In the rock cycle:-

Rocks are formed when hot molten lava comes from mantle in the form of volcanoes. After sometime this lava cools down and form ROCK.

The rocks are of basically three types :- igneous, sedimentary and metamorphosed rocks.

These rocks are form and erodes in the form of dust and then again form out of lava.

You might be interested in

Choose the correct statement concerning units of power or energy. a. A kilojoule (kJ) is a unit of power. b. A gigawatt (GW) is

sergiy2304 [10]

Answer:

A kilowatt (kW) is a unit of power.

Explanation:

The power of an object is given by :

$P=\dfrac{E}{t}$

Here,

E is the energy required

t is time

The SI unit of power is Watts and the SI unit of energy is Joule. the commercial unit of energy is kilowatt per hour.

Option (1) : A kilojoule (kJ) is a unit of power is incorrect.

Option (2) : A gigawatt (GW) is a unit of energy is incorrect.

Option (3) : A watt (W) is a unit of energy is incorrect.

Option (4) : A kilowatt x hour per year (kWh/yr) is a unit of energy is incorrect.

Option (4) : A kilowatt (kW) is a unit of power is correct.

Hence, the correct option is (d).

3 0

3 years ago

Homeowners will typically have their heaters set for about 140 degrees F. What is that temperature in C.

lana [24]

It would be 60 degrees Celsius:)

6 0

3 years ago

A boy of mass 80 kg slides down a vertical pole, and a frictional force of 480 N acts on him. What is his acceleration as he sli

olga_2 [115]

Answer:

His acceleration is $\overrightarrow{a}=4\frac{m}{s^{2}}$

Explanation:

Newton's second law states that acceleration of a body is cause by a net force, the relation between them is:

$\sum\overrightarrow{F}=m\overrightarrow{a}$

On the boy there're acting two forces, his weight (W) that points downward and the frictional force (f) that points upward (they boy moves downward and friction always is opposite to movement). So $\sum\overrightarrow{F}=\overrightarrow{W}+\overrightarrow{f}$ so (1) is:

$\overrightarrow{W}+\overrightarrow{f}=m\overrightarrow{a}$

Using the positive direction downward weight and gravitational acceleration(g) are positive and friction force is negative:

$W-f=m\overrightarrow{a}$ , solving for a:

$\overrightarrow{a}=\frac{W-f}{m}$ , weight is mg:

$\overrightarrow{a}=\frac{mg-f}{m}=\overrightarrow{f}=\frac{(80kg)(10\frac{m}{s^{2}})-(480)}{80}$

$\overrightarrow{a}=4\frac{m}{s^{2}}$

6 0

4 years ago

Calculate the power produced by a 12 V battery charger if it delivers:A. 10 A in the fast charge modeB. 2 A in trickle charge mo

Novay_Z [31]

The electric power (P) produced by an electric current (I) passing through a voltage (V) is given by the equation:

$P=VI$

If the battery charger works with a voltage of 12V, replace V = 12V into the equation, as well as the corresponding values for the electric current to find the power produced in each case.

A) I = 10A

Replace V=12V and I=10A to find the power produced in the fast charge mode:

$P=(12V)(10A)=120W$

B) Replace V=12V and I=2A to find the power produced in the trickle charge mode:

$P=(12V)(2A)=24W$

Therefore, the power produced by a 12V battery charger is equal to 120 Watts when it delivers 10A in fast charge mode, and 24 Watts when it delivers 2A in trickle charge mode.

3 0

1 year ago

Why do we use days and hours instead of hours?<br>

MA_775_DIABLO [31]

Answer:

becuase counting by hours is more complicated. then days, to make it easier to understand instead of saying I will see you in 48 hours... its easier to understand and think to say see you in 2 days!

Explanation:

hope this helps. also we did not determine time. people from history did so... wasnt really my choice or anyones!

4 0

2 years ago