The current stellar "yardstick" is the ______

Answers

Answer 1

Answer: The light year is the unit often used to describe distance in terms of astronomy

Answer 2

Answer: It the 'parsec', equal to about 3.26 light years.

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Most of the circuits in your home area. parallel circuits.
b. switch circuits.
c. series circuits.
d. reversible circuits.

Answers

The correct answer to the question is: A) Parallel circuits.

EXPLANATION:

There are normally two types connection of circuit elements which are preferred for connection of electrical appliances.

Most of the circuits in home are connected to each other in a parallel way.

We know that the potential remains constant at every circuit elements for parallel connection. The potential drop across each circuit element will be different for series connection.

Due to the parallel connection, each circuit elements can be switched on or off separately.

Hence, most of the electrical circuits in home are connected in parallel way.

Option (a) is correct. The most of the circuits at home are the parallel circuits.

Further Explanation:

The normal wiring in the electrical appliances used in the household circuits are either done in series circuit or in a parallel circuit.

A series circuit is a circuit in which all the alliances are connected to one another in a linear manner. In series circuit, the current flowing through all the elements in a circuit remains the same but the voltage drop changes.

A parallel circuit is a circuit in which all the appliances are connected across the voltage source and therefore, the voltage drop across all the appliances remains the same.

The switching circuit and the reversible circuits are the circuits which make use of the several sensors and electronic adapters to control the circuit.

The parallel circuits are more advantageous over the other circuits because if any fault occurs in any one of the instrument or appliance, the whole circuit is not affected due to this. The rest of the circuit continues to work without any issue.

Thus, Option (a) is correct. The most of the circuits at home are the parallel circuits.

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2. If a current of 2.4 a is flowing in a cylindrical wire of diameter 2.0 mm, what is the average current density in this wire brainly.com/question/10597501

3. A small bulb has a resistance of 2 ohm when cold brainly.com/question/10421964

Answer Details:

Grade: High School

Subject: Physics

Chapter: Electrical circuits

Keywords:

Parallel circuits, switch circuits, reversible circuits, series circuit, most of the circuits, household circuit, appliances, fault, not affected, current remains same, voltage drop across.

The peak intensity of radiation from Star Beta is 350 nm. What is the average surface temperature of Star Beta rounded to the nearest whole number? 121 K 6,547 K 8,285 K 10,348 K

Answers

Wien's Displacement Law is:
peak x surface temperature = 2.898 x 10^-3 m K

So,
surface temperature = 2.898 x 10^-3 m K / peak = 2.898 x 10^-3 m K / 350 x 10 -9 m
surface temperature = 8280 K

The closest to the choices is 8285 K.

Answer:

8285 K.

Explanation:

A 0.4-kg toy train car moving forward at 3 m/s collides with and sticks to a 0.8–kg toy car that is traveling in the opposite direction at –2 m/s. What is the size and direction of the final velocity of the two cars

Answers

Hey there!

Seems like you're looking for the size and direction to the final velocity of the two cars. To find it, you must solve it like this.

0.4 kg(3 m/s) + 0.8kg(–2 m/s) = 1.2 kg m/s -1.6 kg m/s = –0.4 kg m/s

–0.4 kg m/s = 1.2 kg(v) = (–0.4 kg m/s)/(1.2 kg) = v = –0.33 m/s

So, the cars are traveling at -0.33 m/s in the direction of the second car.

Hope this helps

Tobey

If 20 beats are produced within one second, which of the following frequencies could possibly be held by two sound waves traveling through a medium along a common path at the same time? A. 38 Hz and 63 Hz
B. 22 Hz and 42 Hz
C. 47 Hz and 55 Hz
D. 18 Hz and 26 Hz

Answers

Answer:

B. 22 Hz and 42 Hz

Explanation:

The beat is an interference pattern which occurs when two waves of slightly different frequencies meet each other. The beat is heard as a periodic variation, whose frequency (called beat frequency) is equal to the absolute value of the difference between the frequencies of the individual waves:

$f_B = |f_1-f_2|$

In this problem, we are told that 20 beats per second are produced, so the beat frequency is

$f_B = 20 s^(-1) = 20 Hz$

Therefore, we must find the two waves which have a difference in frequency equal to this value, 20 Hz. Let's see each choice:

A. 38 Hz and 63 Hz --> $f_B = |38 Hz-63 Hz|=25 Hz$ --> NO

B. 22 Hz and 42 Hz --> $f_B = |22 Hz-42 Hz|=20 Hz$ --> YES

C. 47 Hz and 55 Hz --> $f_B = |47 Hz-55 Hz|=8 Hz$ --> NO

D. 18 Hz and 26 Hz --> $f_B = |18 Hz-26 Hz|=8 Hz$ --> NO

So, the correct choice is

B. 22 Hz and 42 Hz

The right answer for the question that is being asked and shown above is that: "B. 22 Hz and 42 Hz." If 20 beats are produced within one second, the frequencies that could possibly be held by two sound waves traveling through a medium along a common path at the same time is B. 22 Hz and 42 Hz

Justin is standing in the tee box and swings the golf club. As he swings, the end of the golf club gains speed and _____________. A. Chemical energy B. Kinetic energy C. Potential energys he swings,

Answers

Kinetic energy is gained.

Potential energy is gained here as he swings.

Groups of students are measuring the masses of several rocks. They have a scale that can show readings in pounds or kilograms. The teacher requires that they all make their measurements in kilograms.Why would the teacher make a decision like this?

Choose 1 answer:

(Choice A) A kilogram is larger than a pound, so the scale could measure more massive rocks.

(Choice B) Accurate measurements cannot be made in pounds.

(Choice C) Pounds cannot be converted to kilograms.

(Choice D) It is easier to compare measurements when using the same unit system.

Answers

Answer:

(D). It is easier to compare measurements when using the same unit system.

Explanation:

Kilograms are the standard unit of mass in the metric system, while pounds are the standard unit of mass in the imperial system.

The two systems are not directly convertible, so it would be difficult to compare measurements made in different units.

Therefore, the teacher requires that the students make their measurements in kilograms to simplify the comparison of their results.

So, answer (D). It is easier to compare measurements when using the same unit system.

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Let's see the other option:

Choice (A) is incorrect because a kilogram is not larger than a pound. A kilogram is equal to about 2.2 pounds.
Choice (B) is incorrect because accurate measurements can be made in pounds.
Choice (C) is incorrect because pounds can be converted to kilograms. The conversion factor is 1 kilogram = 2.2 pounds.

For verified answers and to learn more:

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Answer:

Choice D

Explanation:

The correct answer is (Choice D) It is easier to compare measurements when using the same unit system.

When conducting scientific experiments or measurements, it is crucial to maintain uniformity in the units of measurement to facilitate accurate comparisons and analysis. By requiring all students to measure the masses of rocks in kilograms, the teacher ensures consistency and eliminates any potential confusion that may arise from using different unit systems.

Using the same unit system allows for straightforward comparisons and calculations without the need for converting between units. It simplifies data analysis and interpretation, which is crucial for scientific accuracy and understanding. By standardizing the unit of measurement to kilograms, the students can directly compare the masses of rocks and draw meaningful conclusions from their data.

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One consequence of Einstein's theory of special relativity is that mass is a form of energy. This mass-energy relationship is perhaps the most famous of all physics equations: E=mc2, where m is mass, c is the speed of the light, and E is the energy. In SI units, the units of speed are m/s. For the preceding equation to have consistent units (the same units on both sides of the equation), the units of E must be which of the following?