PHYSICS MIDDLE SCHOOL

Friction in machines is commonly reduced by using what?

Answers

Answer 1
Answer: The answer would be lubricant
Answer 2
Answer:

Answer:

the correct answer would be lubricant.I hope that helps!!!

Explanation:

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Recall Elmer Trett, who in 1994 reached a speed of 103m/s on his motorcycle. Suppose trett drives off a horizontal ramp at this velocity and lands a horizontal distance of 40.0m away from the edge of the ramp. What is the height of ramp?

Answers

Speed of the motor cycle is given as

v_x = 103 m/s

distance that he moved off from the ramp is given as

x = 40 m

now we know that

x = v_x * t

40 = 103* t

t = 0.39 s

now we can use this to find the height

h = v_i*t + (1)/(2)gt^2

h = 0 + (1)/(2)*9.8*0.39^2

h = 0.74 m

so its height will be 75 cm from ground

Final answer:

The height of the ramp is approximately 0.748m.

Explanation:

To find the height of the ramp, we can use the equations of motion. Since the motorcycle leaves the ramp horizontally, the horizontal distance traveled is equal to the initial horizontal velocity multiplied by the time of flight.

Using the equation x = vt, where x is the horizontal distance traveled, v is the initial horizontal velocity, and t is the time of flight, we can solve for t.

For this problem, the horizontal distance is 40.0m and the initial horizontal velocity is 103m/s. Substituting these values into the equation, we get t = x/v = 40.0m / 103m/s = 0.388s.

Next, to find the height of the ramp, we can use the equation h = (1/2)gt^2, where h is the height of the ramp and g is the acceleration due to gravity (approximately 9.8m/s^2). Substituting the value of t we found into the equation, we get h = (1/2)(9.8m/s^2)(0.388s)^2 = 0.748m.

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Which of the following is an important property of stars, because it provides some information about the temperature of a star? Group of answer choices The shape of the star The distance to the star The star's color The star's name

Answers

The star'scolor is an important property of stars because it provides some information about the temperature of a star. The correct option is C.

What does color of star indicates?

A star'shue depends on its temperature; cooler stars seem red, while hotter stars appear blue or white.

This is due to the fact that although stars emitlight over the full spectrum, the predominant hue in the light that we perceive is the color that corresponds to the star's temperature.

The other stated characteristics, such as a star's name, distance from the star, and shape, have no direct bearing on a star's temperature.

However, these characteristics can also provide crucialdetails about the star, such as its size, brightness, and location in the sky.

Thus, the correct option is C.

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Answer:

The stars color

Explanation:

Scientists know how a Star is by their color like blue is hotter than red

What are the four most common gases in dry air?

Answers

The four most common gases in dry air are nitrogen, oxygen, carbon dioxide, and water vapor.

The four most common gases in dry air are nitrogen, oxygen, carbon dioxide, and water vapor.

Nitrogen is the most abundant gas in dry air, making up about 78.6% of the air.

Oxygen is the second most abundant gas, accounting for approximately 20.9% of the air.

Carbon dioxide is present in small amounts, around 0.04%, but it plays an important role in the Earth's carbon cycle and climate. Water vapor, despite being a variable component, can make up around 0.5% of the air.

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nitrogen
oxygen
argon
carbon dioxide

If the wavelength of a wave increases does its frequency also increase?

Answers

Frequency decreases whilst wavelength increases and the opposite also occurs

You are in a desert on a hot day and see water in the distance. It is not really there, you see it because light bends due to a difference in the temperature of air. Which behavior of light best explains this? Select one: a. reflection b. translocation c. diffraction d. refraction

Answers

Answer:

d) refraction

Explanation:

in physics, refraction is the change of direction of a wave passing from one medium to another. refraction of light is the most commonly observed phenomenon but other waves such as sound waves and water waves also experience refraction

Answer:

B. Translocation

Explanation:

It means a change in location. It often refers to genetics, when part of a chromosome is transferred to another chromosome, you want a change in location because you are so thirsty in the desert and need water

How must of the roller coaster's kinetic and/or potential energy is in each of the points. For each point, pick one option. (Sorry for the report, I found a mistake in my question and could not edit.)Point A:
a. 1/2 Potential Energy, 1/2 Kinetic Energy
b. 1/2 Potential Energy, 0 Kinetic
c. 100 Potential Energy

Point B:
a. 1/4 Potential, 3/4 Kinetic
b. 100 Kinetic, 0 Potential
b. 1/2 Potential, 1/2 Kinetic

Point C:
a. 1/2 Potential, 1/2 Kinetic
b. 3/4 Potential, 1/4 Kinetic
c. 100 Potential, 0 Kinetic

Answers

Answer

  1. Point A-
  2. Point B-
  3. Point C- 100 Potential, 0 Kinetic
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