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4 years ago

What is the difference between burning and heating? How can you tell in the lab if you are heating or burning?

1 answer:

4 0

The difference between burning and heating is burning involves combustion, heating is just a transfer of kinetic energy. you can tell presence of smoke typically, although you can have superficial burn.

hope this help

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What is the mass of a dog that weighs 382 N?(unit=kg)

tino4ka555 [31]

Answer:

38.77 kg

Explanation:

The weight of an object is given by:

Weight = mg, g = acceleration due to gravity ( 9.8 m/s square)

and m is the mass.

So, in this case:

Weight of dog is 382 N, so, by putting the values of weight and g into the equation we will get the mass of dog.

382 = mass multiply with 9.8

so, the mass of the dog will be 38.77 kg

4 0

4 years ago

Electrons in a particle beam each have a kinetic energy of 4.0 × 10−17 J. What is the magnitude of the electric field that will

denpristay [2]

Explanation:

Relation between work and change in kinetic energy is as follows.

$W_{net} = \Delta K$

Also, $\Delta K = K_{initial} - K_{final}$

= $(0 - 4.0 \times 10^{-17})$ J

= $-4.0 \times 10^{-17}$ J

Let us assume that electric force on the electron has a magnitude F. The electron moves at a distance of 0.3 m opposite to the direction of the force so that work done is as follows.

w = -Fd

$-4.0 \times 10^{-17} J = -F \times 0.3 m$

F = $1.33 \times 10^{-16}$

Therefore, relation between electric field and force is as follows.

E = $\frac{F}{q}$

= $\frac{1.33 \times 10^{-16}}{1.60 \times 10^{-19} C}$

= $0.831 \times 10^{3}$ C

Thus, we can conclude that magnitude of the electric field that will stop these electrons in a distance of 0.3 m is $0.831 \times 10^{3}$ C.

3 0

4 years ago

You observe a spiral galaxy with a large central bulge and tightly wrapped arms. It would be classified a

miv72 [106K]

Answer:

Explanation:

Spiral Galaxies -

It is a disk shaped galaxies which have spiral structure , is refereed to as spiral galaxies .

According to Hubble , these galaxies are classified as Sa , Sb , Sc .

Where ,

Sa - have the structure , which is bulged from the central portion , along with a tightly wrapped spiral structure .

Sb - have a lesser bulge and the spiral is looser .

Sc - It has very weak bulge with the open spiral structure .

Hence , from the question ,

The given information is about the Sa .

6 0

4 years ago

When the sun heats up the surface of a puddle of water

nika2105 [10]

The puddle evaporates

4 0

3 years ago

2 diferencias y 2 similitudes entre la actividad física y el ejercicio físico.

blondinia [14]

Answer:

En el deporte, la persona que lo práctica tiene que adecuarse a él, por el contrario cuando hablamos de actividad física el objetivo pasa por programar, dosificar y adecuar en entrenamiento a las características, necesidades y objetivos de cada persona.

6 0

3 years ago