PHYSICS HIGH SCHOOL

_______ is a subtype of the continental climate. A. Humid subtropical
B. Subarctic
C. Semiarid
D. Tropical wet

Answers

Answer 1
Answer: The answer is A. Humid Subtropical

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After a large snowstorm, you shovel 2,500 kilograms of snow off of your sidewalk in half an hour. You liftthe shovel to an average height of 1.5 meters while you are piling the snow in your yard.
a. How much work did you do? Hint: The force is the weight of the snow.
b. What was your power in watts? Hint: You must always convert time to seconds when calculating power.

Answers

Well, the snow has a total weight G=mg=25,000 N. The work is L=Fd=Gh=1.5*25,000=37,500 J. The power is L/t, where t=1800 seconds. P=37,500/1800=20.833 W.

List all physical changes.

Answers

Physical changes refer to alterations in the properties or characteristics of matter without changing its chemical composition. Some examples of physical changes include changes in state, size, shape and color.

Changes in state are common physical changes that occur when matter transitions between solid, liquid, or gas phases. This change occurs due to a change intemperature or pressure. For example, water freezing into ice or boiling into steam are examples of changes in state.

Changes in size, shape, and texture occur when matter undergoes physical alterations without any changes in its chemical composition. For instance, cutting a piece of paper into small pieces, hammering a metal sheet to make it thinner, or molding clay into a different shape are all examples of physical changes.

Changes in color are also physical changes. They occur when the light-reflecting properties of a material change due to a physical alteration. For instance, when copper is exposed to air, it turns green due to a chemical reaction, but when iron rusts, it changes color due to a physical change in its surface.

learn more about Pressure here.

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Under what conditions can light be modeled like a ray? Like a wave?

Answers

when the aperture or object size is equivalent to the wavelength of light

Which term defines the process of a wave bouncing off of a surface?a. reflection
b. refraction
c. destructive interference
d. constructive interference

Answers

the answer to that question is reflection

A net force of -1,000 Newtons is delivered to the object over a time of .02 seconds. Calculate the new velocity of the object.

Answers

The change in velocity (v₂ - v₁) is

                 (-20) / (the object's mass).

Call it a crazy hunch, but I can't shake the feeling that there was more
to the question before the part you copied, that mentioned the object's
mass, and its velocity before this force came along.

When heating a substance, a phase change will start to occur when the kinetic energy of the particles is _____________ the attractive forces between the particles. Question 8 options: A. great enough to combine
B. low enough to combine
C. low enough to overcome
D. equal to
E. great enough to overcome

Answers

Answer: E. great enough to overcome.

Explanation: The three phases of the substances are solid, liquid and gas.

When a substance is heated, that is the molecules gain kinetic energy as kinetic energy is directly proportional to temperature.

The phase change will take place only when kinetic energy will be greater than the inter molecular forces as the molecules have to move in more random motion.

For example: Solid with high inter molecular forces are heated to convert it into liquid state only when kinetic energy will overcome the inter molecular forces of attraction.
Your answer is great enough to overcome :) 
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