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3 years ago

In which situation is chemical energy being converted to another form of energy?

Physics

2 answers:

anygoal [31]3 years ago

8 0

D. A burning candle. (chemical energy into energy of heat and light, i.e. thermal and wave)

vladimir1956 [14]3 years ago

4 0

Answer: Option (D) is the correct answer.

Explanation:

When we burn a candle then combustion reaction takes place as it results in the formation of carbon dioxide gas and water in the form of vapors (stream).

Thus, we can conclude that when a candle is burnt then chemical energy gets converted to heat energy or light energy.

As due to this heat energy the wax starts to melt.

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Urippe Went to start his lawnmower and was having trouble. At the same moment, Uwi was starting her identical lawnmower in the y

Ivan

Answer:

As each mower presumably needs the same torque to start, and torque is a product of force and moment arm, the longer moment arm of 10.42 cm on Uwi's mower means lower force is required when compared to Urippe's shorter moment arm of 1.35 cm

350 rev/min = 350(2π) / 60 = 36.652 rad/s

36.652 rad/s / 0.294 s = 124.66... 125 rad/s²

a = αR = 125(0.1042) = 12.990... 13 m/s²

a = αR = 125(0.0135) = 1.68299... 1.7 m/s²

I am GUESSING that we are supposed to model these mowers as a uniform disk

τ = Iα

FR = (½mr²)α

F = mr²α/2R

Urippe's pull = (3.56)(0.2041²)(124.66) / (2(0.0135)) = 702.008... 702 N

Usi's pull = (3.56)(0.2041²)(124.66) / (2(0.1042)) = 90.9511...91.0 N

L = Iω = (½(3.56)(0.2041²))36.652 = 2.71771...2.72 kg•m²/s down

using the right hand rule

8 0

3 years ago

2) Two railway tracks are parallel to west east direction. Along one track, train A moves with a speed of 45 m/s from

OLEGan [10]

Answer:

$Relative\ Velocity = 105m/s$

Explanation:

Given

$V_A = 45m/s$

$V_B = 60m/s$

Required

Determine the speed of B w.r.t A

The question implies that, we determine the relative velocity of B w.r.t A

Because both trains are moving towards one another, the required velocity is a $sum\ of\ velocities\ of$ both trains:

This is shown below:

$Relative\ Velocity = V_A + V_B$

$Relative\ Velocity = 45m/s + 60m/s$

$Relative\ Velocity = 105m/s$

4 0

3 years ago

Polar molecules have ionic bonds. True False

Nadusha1986 [10]

Polar molecules do have ionic bonds

6 0

3 years ago

A metal block suspended from a spring balance is submerged in water. You observe that the block displaces 55 cm3 of water and th

DiKsa [7]

Answer:

8977.7 kg/m^3

Explanation:

Volume of water displaced = 55 cm^3 = 55 x 10^-6 m^3

Reading of balance when block is immersed in water = 4.3 N

According to the Archimedes principle, when a body is immersed n a liquid partly or wholly, then there is a loss in the weight of body which is called upthrust or buoyant force. this buoyant force is equal to the weight of liquid displaced by the body.

Buoyant force = weight of the water displaced by the block

Buoyant force = Volume of water displaced x density of water x g

= 55 x 10^-6 x 1000 x .8 = 0.539 N

True weight of the body = Weight of body in water + buoyant force

m g = 4.3 + 0.539 = 4.839

m = 0.4937 kg

Density of block = mass of block / volume of block

= $\frac{0.4937}{55\times10^{-6}}$

Density of block = 8977.7 kg/m^3

4 0

3 years ago

Explain why a ball thrown in space could keep moving forever, while a ball thrown here on Earth will come to a stop.

Dmitriy789 [7]

Answer:

In space there is no air resistance. on earth there is

in space there is no opposite forces acting on stopping the ball, so if you throw it it will go on forever.

on earth there is air resistance and gravity, this will pull the ball towards the ground and slow it down.

4 0

3 years ago