All categories

3 years ago

HELP ASAP VERY IMPORTANT.

Physics

1 answer:

sertanlavr [38]3 years ago

4 0

Answers:

1. The hot soup will loose the heat and the ice water will gain the heat

If two jars are insulated inside the insulated box, the heat may not be transferred to outside of the box.

According to II law of thermodynamics, Heat always flow from high temperature body to low temperature body, with out aid of external energy.

So, from two points, it is concluded that The hot soup will lose heat and the ice water will gain the heat until they reach the thermodynamic equilibrium.

2. The particles in gases are farther apart and move faster

Particles in the gases are loosely packed (greater distance between particles compared to solids and liquids) and particles collide less often.

Therefore conduction is weak in gases compared to solids and liquids.

3. Heat and milk by conduction; popping popcorn by radiation.

The heat can transfer from pot to the milk by conduction because they are in contact at boundaries, similarly the pot and the stove are in contact so the conduction transfers heat from pot to the milk. 
In microwave oven there is no direct contact (no conduction) of heat and popcorn, also there is no molecular momentum transfer (means of no convection).

So obviously the heat transfer by radiation occurs in a microwave oven.

You might be interested in

Atividade 1) A presença do campo magnético terrestre proporciona alguns efeitos interessantes. Dentre eles estão as auroras pola

VLD [36.1K]

The answer is 1 the first one is the only one that makes sense

7 0

3 years ago

In a thundercloud there may be an electric charge of 24 C near the top of the cloud and −24 C near the bottom of the cloud. If t

lidiya [134]

Answer:

Electric force, $F=1.29\times 10^6\ N$

Explanation:

Given that,

Charge 1, $q_1=24\ C$

Charge 2, $q_2=-24\ C$

Distance between charges, d = 2 km

The electric force is given by :

$F=k\dfrac{q_1q_2}{d^2}$

k is the electrostatic constant

$F=8.98755\times 10^9\times \dfrac{(24)^2}{(2\times 10^3)^2}$

F = 1294207.2 N

$F=1.29\times 10^6\ N$

Hence, this is the required solution.

5 0

4 years ago

What is the entropy change of a 0.349 g spoonful of water that evaporates completely on a hot plate whose temperature is slightl

quester [9]

Answer:

$\Delta S = 2.11 J/K$

Explanation:

As we know that entropy change for phase conversion is given as

$\Delta S = \frac{\Delta Q}{T}$

Here we know that heat required to change the phase of the water is given as

$\Delta Q = mL$

here we have

$m = 0.349 g = 3.49\times 10^{-4} kg$

L = 2250000 J/kg

now we have

$\Delta Q = (3.49 \times 10^{-4})\times 2250000$

$\Delta Q = 788.9 J$

also we know that temperature is approximately same as boiling temperature

so we have

$T = 373 k$

so here we have

$\Delta S = \frac{788.9}{373}$

$\Delta S = 2.11 J/K$

3 0

3 years ago

A circular coil with 600 turns has a radius of 15 cm. The coil is rotating about an axis perpendicular to a magnetic field of 0.

Reil [10]

Answer:

The angular frequency is the coil rotating is 1.9 rad/s.

Explanation:

Given that,

Number of turns = 600

Radius = 15 cm

Magnetic field = 0.020 T

Maximum induced emf = 1.6 V

We need to calculate the angular frequency is the coil rotating

Using formula emf

$\epsilon =NBA\omega\sin\omega t$

When induced emf is maximum so $\sin\omega t$ will be 1.

$\omega=\dfrac{\epsilon}{NBA}$

Where, N = number of turns

A = area

B = magnetic field

Put the value into the formula

$\omega=\dfrac{1.6}{600\times\pi\times(15\times10^{-2})^2\times0.020}$

$\omega=1.9\ rad/s$

Hence, The angular frequency is the coil rotating is 1.9 rad/s.

6 0

3 years ago

Which of the following would cause an iron bar to start generating a magnetic field? A Orienting the iron bar so that it points

shusha [124]

Answer:

Wrapping the bar with a coil of wire that has an electric current.

Explanation:

To cause an iron bar to start generating a magnetic field, wrap the bar with a coil that has an electric current.

This process is known as making magnetics using an electric current.
There is an interaction between electric and magnetic fields.
Electrical current can be induced by magnetic fields and magnetism can be induced by electric currents.

Wrapping the bar with a coil of wire that has electric current can cause an iron bar to start producing magnetic fields. This way, the iron bar becomes a magnet.

5 0

3 years ago