PHYSICS HIGH SCHOOL

A train travels 225 kilometers in 2.5 hours. What is the train’s average speed?

Answers

Answer 1
Answer: the train travells at he speed of 225 km/2.5h
now
225km=225000m
2.5 hr=150min=9000s
=>avg sp of train is=225000/9000s=25m/s
Answer 2
Answer:

Answer:

562.5

Explanation:

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When object A collides with object B and bounces back, its final momentum is ____ its initial momentum.a. greater than
c. in the same direction as
b. less than
d. in the opposite direction of

Answers

When object A collides with object B and bounces back, its final momentum is in the opposite direction of its initial momentum. The correct option among all the options that are given in the question is the last option or option "d". This type of collision is elastic in nature as the ball bounces back and so the momentum has to be in the opposite direction of the initial momentum. 

Answer : (D) " in the opposite direction of "

Explanation :

It is given that when object A collides with object B and bounces back. This shows that the collision is elastic. There are two conditions for elastic collision :

(1) The momentum remains conserved

(2) Kinetic energy is conserved.

We know that momentum is defined as the product of mass and velocity. After bouncing back, the direction of velocity gets changed. So, the final momentum is in the opposite direction of its initial momentum.

So, the correct option is (D).

Oil flows upward in the wick of a lantern because of the liquid property called A. density.
B. meniscusity.
C. viscosity.
D. capillarity.

Answers

The answer is A because the lighter or heavier the liquid is (in this case it depends) it flows up.

the correct answer is

D. capillarity

How does carbon dioxide affect the atmosphere

Answers

Explanation:

Carbon dioxide is a naturally occurring greenhouse gas... An increase in the amount of carbon dioxide creates an overabundance of greenhouse gases that trap additional heat. This trapped heat leads to melting ice caps and rising ocean levels, which cause flooding.

Which of these follows from Newton's laws about the energy of a moving object? A)The total mechanical energy of an object is always constant. B)The kinetic energy of an object remains the same if friction is absent. C)The mechanical energy remains the same if there are only conservative forces acting. D)The total of all forms of energy is always constant.

Answers

The correct answer for the question that is being presented above is this one: "C)The mechanical energy remains the same if there are only conservative forces acting." The statement that shows that Newton's laws about the energy of a moving object is that the mechanical energy remains the same if there are only conservative forces acting.

A stone falls from a ledge and takes 8 seconds to hit the ground. The stone has an original velocity of 0 m/s. How tall is the ledge? A. 313.6 meters B. 78.4 meters C. 39.2 meters D. 1,254.4 meters

Answers

The right answer for the question that is being asked and shown above is that: "D. 1,254.4 meters." A stone falls from a ledge and takes 8 seconds to hit the ground. The stone has an original velocity of 0 m/s. The ledge has the height of D. 1,254.4 meters

By the way, on the Penn Foster test, C. 1,254.4 meters is incorrect.

Your friend is asked to differentiate between evaporation and boiling.what questions could you ask to make him to know the difference between evaporation and boiling?physics question.

Answers

Answer:

Boiling is the "rapid vaporization of liquid" when the liquid is heated at the point where the pressure of the vapor is equal to the pressure exerted by the atmosphere in the liquid.

So during the boiling, the vaporization of the water is also occurring but is a little bit more complex.

Some questions that you may ask your friend to differentiate those two phenomena are:

Which one is used to cook things like pasta? (boiling)

in which process, a liquid is transformed into a gas? (evaporation)

Which one includes the other? (boiling)

Final answer:

Evaporation and boiling are both phases changes, but they differ in the specifics of how and when they happen. These differences involve the temperature and location within the liquid where they occur, as well as the speed of the process.

Explanation:

To differentiate between evaporation and boiling, you could ask your friend these questions:

  1. Does the process occur at any temperature or only at a specific temperature (the boiling point)? (Evaporation can occur at any temperature while boiling only occurs at the boiling point.)
  2. Does the process occur throughout the liquid or only at the surface? (Boiling occurs throughout the liquid while evaporation happens only at the surface.)
  3. Is the process slow or fast? (Evaporation is a slow process while boiling is relatively quick.)

By asking these questions, your friend will be able to identify the key differences that separate evaporation from boiling.

Learn more about Evaporation vs Boiling here:

brainly.com/question/32818279

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