Compared to a stationary galaxy, light from a galaxy that is moving toward Earth will appear _____.a. bluer
b. redder
c. the same

Answers

Answer 1

Answer: a. Bluer

As per Doppler effect, when the source of light is moving toward the receptor of the light the waves experience "compresssion" increasing the frequency of the way and the color turns bluer, this is known as blueshift.

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Question on attachment

Which of the following is the best example of a compression force?a. dragging a rope to move a sled
b. the force of weight on a bicycle
c. typing the computer key for the letter y
d. the force of a picture hanging on a nail

Answers

The best example of a compression force is the force of weight on a bicycle. The answer is letter B. A compression force is when the weight of the bicycle imposes a downward force to the ground and the ground imposes an upward force to the bicycle.

I took the test and got B) the force of weight on a bicycle correct

If We Start With 400 Atoms of a Radioactive Substance, How Many Would Remain After One Half-life ?

Answers

If it's half life, that means that half of the atoms have died out. Therefore, 200 atoms have died, so there are 200 atoms left (exactly one half of 400)

200, the half life of a radioactive substance is pretty simple to remember. It is literally cutting it in half, however, don't make the same mistake I did in this subject, the second half life does not reduce it to 0, it reduces it to 100. It just keeps half-lifing over and over again. For example: 400 atoms after one half life:200, after two: 100, after 3, 50, and so on.

What is a lunar eclipse?

Answers

Moon eclipse is when the moon interposes between the sun and behind the Earth. The moon passes behind the Earth into its umbra and not viceversa! This is possible when the three of them are ALIGNED (in syzygy). In Romania, there was such eclipse that could be seen at an October night last year.

A lunar eclipse is basically when the earth passes between the moon and sun, causing the moon to appear darkened. Also, unlike the solar eclipse, the lunar eclipse occurs during the day.

Which will have more resistance: 220V, 100W bulb or a 220V, 60W bulb?

Answers

The power dissipated by something with voltage across it is

(voltage)² / (resistance) .

You can see that resistance is in the denominator of the fraction,
so larger resistances dissipate less power, and smaller resistances
dissipate more power.

Here's an easy way to remember it:
-- Connecting a piece of rubber (high resistance) across the terminals of a battery
uses very little power from the battery.
-- Laying a piece of wire (low resistance) across the terminals of a battery
may draw so much power from the battery that the wire melts.

Since the voltage across both bulbs is expected to be the same, the bulb
designed to dissipate 60 watts has higher resistance than the one designed
to dissipate 100 watts.

Describe and explain how the movement and arrangement of the particles in a block of ice change as the ice melts to form liquid water. In your answer, include ideas about energy transfer.

Answers

Answer:

Ice is water in solid phase, in this phase, the particles are very close together and relatively in fixed positions.

As the temperature starts to increase (thermal energy), also does the kinetic energy of the particles (so we have a change from thermal energy to kinetic energy), so they start to move "more", and the position of the particles starts to be less "fixed". There is a point where the particles have enough energy, and this point is where the phase of the water changes from solid to liquid phase (the fusion point). After this point the water can not hold his shape, and takes the shape of the container where it is.

In one hand you hold a .12-kg apple, in the other hand a .20-kg orange. The apple and orange are separated by .75 m. What is the magnitude of the force of gravity that
(a) the orange exerts on the apple?
(b) the apple exerts on the orange?

Answers

Final answer:

The orange exerts a gravitational force on the apple, which can be calculated using the formula for gravitational force. The apple exerts an equal and opposite gravitational force on the orange.

Explanation:

(a) The orange exerts a gravitational force on the apple. The magnitude of this force can be calculated using the formula for gravitational force: F = G * (m1 * m2) / r^2, where G is the gravitational constant (approximately 6.67430 x 10^-11 N*m^2/kg^2), m1 and m2 are the masses of the two objects, and r is the distance between their centers of mass. Plugging in the values, we have F = (6.67430 x 10^-11 N*m^2/kg^2) * (0.12 kg * 0.20 kg) / (0.75 m)^2. Solving this equation gives us the magnitude of the force of gravity between the orange and apple.

(b) The apple exerts an equal and opposite gravitational force on the orange, as described by Newton's third law of motion. This means that the magnitude of the force of gravity exerted by the apple on the orange is the same as the force of gravity exerted by the orange on the apple.

Learn more about Gravitational force here:

brainly.com/question/32609171

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Final answer:

The force of gravity between two objects can be calculated using Newton's universal law of gravitation. The force the orange exerts on the apple, and vice versa, is 2.138 x 10^-11 N. However, the apple's force on the orange is in the opposite direction.

Explanation:

The subject of this question is gravity, a fundamental force in physics. The force of gravity between two objects can be calculated using Newton's law of universal gravitation, which states that every point mass attracts every other point mass by a force pointing along the line intersecting both points. The equation is F = G * ((m1*m2)/r^2), where F is the force of gravity between the two objects, G is the gravitational constant (6.674 x 10^-11 N(m/kg)^2), m1 and m2 are the masses of the objects, and r is the distance between the centers of the two objects.

(a) Using this equation, we can find that the force the orange exerts on the apple is F = (6.674 x 10^-11) * ((0.20*0.12)/0.75^2) = 2.138 x 10^-11 N.

(b) According to Newton's third law of motion, every action has an equal and opposite reaction. Thus, the force the apple exerts on the orange is equal in magnitude and opposite in direction to the force the orange exerts on the apple, or -2.138 x 10^-11 N. The negative sign indicates that this force is in the opposite direction.