The headlights are shining on a truck travelling at 100 km/h. The speed of the light from the headlights relative to the road will be:A) c

B) c + 100 km/h

C) c – 100 km/h

D) depends on the temperature, but faster than the speed if the truck was not moving.

E) faster than if the truck was not moving, but impossible to calculate with the given information

Answers

Answer 1

Answer:

Answer:

A) c

Explanation:

Speed of light is always constant irrespective of the wave source's motion and the observer's inertial frame of reference. So, no matter how fast the car is moving the speed of light will always be constant. The speed of light in air is around 299704644.54 m/s. The meter is also defined by the speed of light as 1 meter is the distance travelled by light in 1/299792458 second.

Answer 2

Answer: A, the light generated from the headlights travels at a fixed speed relative to the road

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If a substance forms crystals when it solidifies, its _______ points are the same. a. melting and freezing
b. melting and condensation
c. evaporation and freezing
d. evaporation and condensation

Answers

I think the correct answer is A. If a substance forms crystals when it solidifies, its melting and freezing points are the same. For most substances, it is known that the freezing and the melting points are equal. Freezing happens by crystallization, formation of crystals from the liquid form.

Answer:

Option (a): Melting point and freezing point are will be the same when crystallization.

Explanation:

When crystals form from the mechanism of crystal growth, it’s known as crystallization. A crystal is a solid type of material which is having a regular pattern of atoms and molecules.

Temperature of a compound which changes its physical state from solid state to liquid state is known as melting point temperature.

Temperature of a compound which changes its physical state from liquid state to solid state is known as the freezing point temperature.

Most of the liquids are freeze by the method of crystallization. The temperature of the system remains nearly equal to melting point.

Further Explanation:

Basically there are two types of crystallization processes. They are the cooling and evaporation crystallization.

Salts, sugar and gemstones are some examples for crystals.

Crystallization consists with two steps; Nucleation and Crystal growth. In nucleation; solute molecules dispersed in the solvent are gather in to clusters. These clusters need to reach a critical size to become stable nuclei, by factors such as temperature and super saturation.

After nucleation, crystal growth happens. In this process the nuclei increases its size to a critical cluster size.

In crystal growth solute molecules precipitate out of solution. Then they dissolve back into solution.

Learn more:

1. Freezing point brainly.com/question/155317 (answer byTenishaTon)

2. Melting point brainly.com/question/13688040 (answer by olowookereboyede)

Keywords:

Melting point, freezing, crystallization

Ilya and Anya each can run at a speed of 8.90mph and walk at a speed of 3.80mph . They set off together on a route of length 5.00miles. Anya walks half of the distance and runs the other half, while Ilya walks half of the time and runs the other half.a)How long does it take Anya to cover the distance of 5.00miles ?
Express your answer numerically, in minutes.
b)Find Anya's average speed.
Express Anya's average speed save,Anya numerically, in miles per hour
C)How long does it take Ilya to cover the distance?
Express the time tIlya taken by Ilya numerically, in minutes.
d)Now find Ilya's average speed.
Express Ilya's average speed save,Ilya numerically, in miles per hour

Answers

Answer:

Part a)

$T = 0.94 hours$

Part b)

$v_(avg) = 5.32 mph$

Part c)

$T = 0.79 h$

Part d)

$v_(avg) = 6.35 mph$

Explanation:

Speed while she is running = 8.90 mph

speed while she walk = 3.80 mph

Part a)

Anya walks half the distance

so time to walk

$t_1 = (2.5)/(3.80) = 0.66 h$

time to cover the distance while she run

$t_2 = (2.5)/(8.90) = 0.28 h$

total time to cover the distance

$T = t_1 + t_2$

$T = 0.94 hours$

Part b)

Average speed is given as

$v_(avg) = (d)/(t)$

$v_(avg) = (5.00 miles)/(0.94)$

$v_(avg) = 5.32 mph$

Part c)

Half the time Llya walks and next half the time she runs

so total distance is given as

$d = v_1(T/2) + v_2(T/2)$

so we have

$5.00 = 8.90(T/2) + 3.80(T/2)$

$T = 0.79 h$

Part d)

Average speed is given as

$v_(avg) = (d)/(t)$

$v_(avg) = (5.00 miles)/(0.79)$

$v_(avg) = 6.35 mph$

Discuss a physical activity that benefits muscular strength and describe at least two other benefits of performing this activity.

Answers

Yoga- It benefits muscular strength as well as core balance and flexibility.
It also improves respiration, energy and vitality.

A mole or fraction of a mole represents a _______number of atoms or molecules.a. specific
b. nonspecific

Can I get some help matching these from the left to the right?

1) increased surface area concentration decreases around solute
2) like polarity increases rate rate proportional to K.E.
3) temperature matching solvent and solute
4) stirring finely divided solute

Answers

A mole or fraction of a mole represents a nonspecific number of atoms or molecules. The answer is letter A.

The correct answer is number 2, like polarity increases rate rate proportional to K.E.

When you drop a 0.4 kg apple, Earth exerts a force on it that accelerates it at 9.8 m/s° toward the earth's surface. According to Newton's third law, the apple must exert an equal but opposite force on Earth.If the mass of the earth 5.98 x 1024 kg, what is the magnitude of the earth's acceleration toward the apple?
Answer in units of m/s?.

Answers

When you drop a 0.4 kg apple, Earth exerts a force on it that accelerates it at 9.8 m/s° toward the earth's surface. According to Newton's third law, the apple must exert an equal but opposite force on Earth.
If the mass of the earth 5.98 x 1024 kg, what is the magnitude of the earth's acceleration toward the apple?
Answer in units of m/s?.

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?

Answers

Answer:

Unit of energy is kg-m/s or Joules.

Explanation:

The mass- energy relationship in physics is given by :

$E=mc^2$

Where

m is the mass of the object

c is the speed of light

The SI unit of m is kilogram while the SI unit of c is as same as speed of light i.e. m/s. So, the unit of energy is kg-m/s. It is also equivalent to Joules.

So, the SI unit of energy is kg-m/s or Joules. Hence, this is the required solution.

Joule is the si unit for energy

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Who will give me answer I will give you brainliest.....