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4 years ago

The distance from Earth to the star Epsilon Eridani is about 10.5 light years. Which of the following statements is true?

Physics

2 answers:

MaRussiya [10]4 years ago

5 0

Answer:

B. It takes a ray of light 10.5 years to travel from Earth to Epsilon Eridani.

Explanation:

Light year is the unit of the distance between two points. It is defined as the distance traveled by light from one point to other for given interval of time.

So here if the distance is given as 10.5 light years then it means the distance between Earth and the given star is same as that the distance traveled by the light in 10.5 years.

So here we can say that distance is

$d = 3\times 10^8 (10.5 \times 365\times 24 \times 3600)$

$d = 9.93 \times 10^{16} m$

so here the correct answer will be

B. It takes a ray of light 10.5 years to travel from Earth to Epsilon Eridani.

Simora [160]4 years ago

4 0

The correct answer is B. - It would take a ray of light 10.5 light years to travel from Earth to Epsilon Eridani, or vice-versa. Using our current technology it would take far longer than 21.0 years for a space ship from Earth to travel that far - I would have to guess many hundreds of years.

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You have a 100 ohm resistor. How

sp2606 [1]

Answer:

R2 = 300 Ohms

Explanation:

Let the two resistors be R1 and R2 respectively.

RT is the total equivalent resistance.

Given the following data;

R1 = 100 Ohms

RT = 75 Ohms

To find R2;

Mathematically, the total equivalent resistance of resistors connected in parallel is given by the formula;

$RT = \frac {R1*R2}{R1 + R2}$

Substituting into the formula, we have;

$75 = \frac {100*R2}{100 + R2}$

Cross-multiplying, we have;

75 * (100 + R2) = 100R2

7500 + 75R2 = 100R2

7500 = 100R2 - 75R2

7500 = 25R2

R2 = 7500/25

R2 = 300 Ohms

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3 years ago

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3 years ago

If the temperature increases in a sample of gas at constant volume, then its. . a. volume increases. b. pressure decreases. c. p

kicyunya [14]

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3 years ago

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Reil [10]

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3 years ago

A worker pushes a box across the floor to the right at a constant speed with a force of 25N. What

icang [17]

Answer:

Friction between the box and the floor is 25N to the left

Explanation:

There are two forces acting on the box along the horizontal direction:

- The force of push applied by the worker, in the forward direction, F

- The force of friction, $F_f$ , acting in the opposite direction (backward)

So the net force acting on the box is

$F_{net}=F-F_f$

According to Newton's second law of motion, the net force on an object is equal to the product between its mass (m) and its acceleration (a), so we can write:

$F_{net}=ma$