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3 years ago

Which of the following is an example of a. Situation in which an egg is receiving thermal energy through convection

Physics

2 answers:

ZanzabumX [31]3 years ago

8 0

The egg is cooked in a pot of water on the stove is the correct example of convection of thermal energy.

Convection is defined as the heat transfer through a fluid or liquid. In this method of heat transfer, equal energy is transferred to all particles of the object dissolved.

victus00 [196]3 years ago

4 0

I think the answer is A.

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ich statement best describes the fundamental difference between spiral and elliptical galaxies? Spiral galaxies are more massive

Ahat [919]

Answer:

The oldest stars in spiral galaxies are younger than the oldest stars in elliptical galaxies.

Explanation:

Spiral galaxies have a greater star formation than elliptical galaxies, since the latter contain less gas and dust. Therefore, the rate of creation of new stars is lower in elliptical galaxies. These galaxies are dominated by old stars, with a long evolution. While the spiral galaxies have stars with a faster evolution.

8 0

3 years ago

Read 2 more answers

A 0.31 kg cart on a horizontal frictionless track is attached to a string. The string passes over a disk-shaped pulley of mass 0

Stella [2.4K]

To solve this problem it is necessary to apply the concepts related to Newton's second law and its derived expressions for angular and linear movements.

Our values are given by,

$M_{cart} = 0.31kg\\m_{pulley} = 0.08kg\\r_{pulley} = 0.012m\\F = 1.1N\\$

If we carry out summation of Torques on the pulley we will have to,

$F_2*d-F_1*d = I \alpha$

Where,

I = Inertia moment

$\alpha =$ Angular acceleration, which is equal in linear terms to a/r (acceleration and radius)

The moment of inertia for this object is given as

$I = \frac{1}{2} mr^2$

Replacing this equations we have know that

$(F_2 - F_1)d = (\frac{1}{2}(m_{pulley})r^2) (\frac{a}{r})$

$F_2 - F_1 = \frac{1}{2}m_{pulley} \frac{F_1}{M_{cart}}$

$F_2 = (1+\frac{1}{2}(\frac{m_{pulley}}{M_{cart}}))F_1$

$F_1 = \frac{F_2}{(1+\frac{1}{2}(\frac{m_{pulley}}{M_{cart}}))}$

Replacing our values we have that

$F_1 = \frac{1.1}{(1 + (0.5)(\frac{0.08}{0.31}))}$

$F_1 = 0.974 N$

Therefore the tension in the string between the pulley and the cart is 0.974 N

6 0

4 years ago

A 1 pF capacitor is connected in parallel with a 2 pF capacitor, the parallel combination then being connected in series with a

asambeis [7]

Hi there!

We can approach this problem in many ways, but to show you how I arrive to the final conclusion, I will begin by solving the circuit with an assigned value for the power source.

Let's use a power source value of 6V (produces nice numbers).

Recall the following rules.

Capacitors in series:

Voltage ADDS up.
Charge is EQUAL across each.
Total capacitance uses the reciprocal rule.

Capacitors in parallel:

Voltage is EQUAL across each.
Charge ADDS up.
Total capacitance is simply the sum.

Solving for total capacitance:
$C_P = 1 + 2 = 3 pF\\\\C_T = \frac{1}{\frac{1}{3} + \frac{1}{3}} = 1.5 pF$

Using rules for capacitors in series and parallel, the total capacitance of the circuit is 1.5 pF.

Thus, the total charge is:
$Q = C_TV\\Q = 1.5 pF * 6 V = 9 pC$

9 pC will go through the parallel combination and the individual capacitor in series with the combination.

Since the voltage adds up, we can find the amount of voltage across the 3pF capacitor with the remaining going through the branches of the parallel combination.

$V = \frac{Q}{C}\\\\V = \frac{9pC}{3pF} = 3V$

Therefore, 3V goes through each branch since 6V - 3V = 3V.

Solving for the charge for each capacitor:
$Q = CV\\Q = (1 pF)(3V) = 3pC\\\\Q = (2pF)(3V) = 6pC\\\\Q = (3pF)(3V) = 9pC$

<u>Thus, the capacitor with the greatest charge is the 3 pF capacitor. </u>

To explain without all of the work above, the equivalent capacitance of the parallel combination (1 pF + 2pF = 3pF) is equivalent to the capacitance of the capacitor in series (3pF). Thus, the voltage across the parallel capacitors (since voltage is the same across branches in parallel) and the series capacitor is equal. However, since charge SUMS UP for capacitors in parallel, they would have less charge than the single capacitor in series.

5 0

2 years ago

Which step of the scientific method is the scientist using? "This paper details my results on how dolphins use sonar to navigate

Kazeer [188]

The step of the scientific method with the information "This paper details my results on how dolphins use sonar to navigate." is: D. Report Results.

Science can be defined as a branch of intellectual and practical study that systematically observes a body of fact with respect to the structure and behavior of both living and non-living organisms in the natural world through experiments.

Some of the steps (activities or actions) that a scientist performs (carries out) while using a scientific method include the following:

Analyze data and draw conclusions.

Observation.

Experimentation.

Report results.

The results of an experiment provide the necessary data and information about the specimen which was used in the course of conducting an experiment.

Hence, a report result would convey these information to the user (reader) of scientific method proposed by a scientist.

In conclusion, a paper which details the results on how dolphins use sonar to navigate is considered a report of the results.

6 0

3 years ago

Which of the following represents a chemical property of hydrogen gas? A) It is gaseous at room temperature. B) It is less dense

ehidna [41]

Answer:

C) It reacts explosively with oxygen.

Explanation:

Physical properties are usually those that can be observed using our senses such as color, luster, freezing point, boiling point, melting point, density, hardness and odor.

What are the Chemical Properties of Hydrogen? They are the characteristics that determine how it will react with other substances or change from one substance to another.

3 0

4 years ago