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4 years ago

The stored energy in a piece of coal can be _________ into heat energy.

Physics

2 answers:

Leviafan [203]4 years ago

7 0

The answer is transformed
because you changed the kind of energy

gavmur [86]4 years ago

4 0

The Law of Conservation of Energy states that energy can either be transferred from one object to another, or transformed from one type to another, but never destroyed. The stored energy in coal is chemical energy because it is ready to react, and when the coal is burned, the chemical energy is transformed by the reaction into heat energy.

Answer: a. transformed

Hope this helps!

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I need help with the second one asap

dangina [55]

Answer:

what I don't know show a question mark me as brainleast

6 0

3 years ago

Read 2 more answers

ASAP please!! <br>The force vectors on an aircraft are as shown. Find the net (resultant force).

ioda

Answer:

The magnitude of the net force is 5430N

Explanation:

I suggest to define the axes as aligned to the axis of the plane. This will require you to decompose only one vector, namely the Weight. We need two components of the W force: one in horizontal direction of the plane, the other perpendicular to it. Through a simple triangle argument you will se that the plane-horizontal component of W is

$W_D=3600 N\cdot\sin 27^\circ=1634N$

acting in the direction of the Drag, and the plane-perpendicular component is:

$W_L=-3600N\cdot\cos 27^\circ=-3208N$

with negative sign since it counteracts the Lift.

So the components of the netforce F are:

$F_h=T-D-W_D=(8000-1000-1634)N=5366N\\F_v=L+W_L=(4100-3208)N=829N$

The magnitude of the net force is:

$|F|=\sqrt{5366^2+829^2}N = 5430N$

6 0

3 years ago

A mole of water molecules would just about fill a

Strike441 [17]

Answer:

B. tablespoon

Explanation:

Considering the question given, a mole of water is small compare to the options given from the question aside the table spoon.

A mole of water is just 18g and that's equivalent to 18 mL.

18 mL of water will fill a table spoon but not a cup which is about 237mL. The wheel barrow and gallon bucket have larger volumes of which 18 mL of water will never fill them.

So, a mole of water can successfully fill a table spoon.

5 0

3 years ago

A powerboat, starting from rest, maintains a constant acceleration. After a certain time 't', its displacement and velocity are

EastWind [94]

Answer: Ok, so you know the acceleration, lets call it A.

now, the velocity will take the form of V= A*t + v0, where v0 is the inicial velocity, in this case the boat starts from the rest, so v0 = 0

integrating again you obtain R = (A*t*t)/2 + r0, and we will take r0 = 0.

so, at a time t₁ we have a velocity V = v = A*t₁

R = r = (A*t₁*t₁)/2

so a t₂=2*t₁

V= A*2*t₁= 2v