PHYSICS HIGH SCHOOL

Let's assume you use green light (λ = 550 nm) to look at an electron. What is the uncertainty in determining the electron's velocity? Express your answer rounded up to the nearest hundredth.

Answers

Answer 1
Answer: By uncertainty principle

λ = h / p.         

Where λ = wavelength,  h = Planck's constant = 6.63 * 10⁻³⁴ Js

λ = wavelength = 550 nm = 550 * 10⁻⁹ m, Mass of electron = 9.1 * 10 ⁻³¹ kg

p = Momentum = mv

λ = h / mv

v = h / mλ

v = 6.63 * 10⁻³⁴ / (9.1 * 10⁻³¹ *  550 * 10⁻⁹)

v = 1 324 675.325 m/s

v ≈ 1.325 *10⁶  m/s

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a penny dropped into a wishing well reaches the bottom in 1.50 seconds. what was the velocity at impact

Answers


On Earth, the acceleration of gravity is 9.8 m/s² downward. 
This means that any falling object gains 9.8 m/s of speed downward
for every second it falls. 

Since the penny fell for 1.5 seconds, its downward speed at the
end of that time is (1.5 x 9.8) = 14.7 m/s faster than at the beginning
of that time. 

Since it was dropped gently from somebody's hand ... and not THROWN
down ... its speed at the beginning is zero.  So its speed after 1.5 seconds
is 14.7 m/s, and its velocity after 1.5 seconds is 14.7 m/s downward.

Similar poles of bar magnets attract each other.
True
False

Answers

(False) similar poles repel and opposite poles attract each other.

Suppose you are in an elevator. As the elevator starts upward, its speed will increase. During this time when the elevator is moving upward with increasing speed, your weight will be:_______.a) greater than your normal weight at rest.b) equal to your normal weight at rest.c) less than your normal weight at rest.

Answers

Answer: The answer is A.

Explanation:

Suppose you are in an elevator. As the elevator starts upward, its speed will increase. During this time when the elevator is moving upward with increasing speed, your weight will be greater than your normal weight at rest.

What are the factors that make florida susceptible to hurricanes.?

Answers

Explanation:

1. Location.

Hurricanes are defined as severe tropical storms that form over warm ocean waters starting as storms in the Caribbean(North American continent) or off the west coast of Africa. As the storms drift slowly westward, they gather heat and energy through contact with warm ocean waters. Evaporation from the seawater increases their power.

Warm, moist air moves toward the center of the storm and spirals upward. Hurricanes rotate in a counter-clockwise direction around an “eye.”

2.

It is low lying. Majority of their lands are just a few feet above sea level.

3. Most of the infrastructures are built on rocks that are permeable to water. Hence, water bubble or seep out in unexpected places. Building of sea walls and other barriers to prevent rising seas, storms etc.

The five factors of production include land, _______, capital, entrepreneurship, and _______.a. effort; education
c. energy; application
b. knowledge; effort
d. labor; knowledge

Answers

The five factors of production include land, labor,capital, entrepreneurship, and knowledge. Land is considered as the primary becausethese are the pre-existent resources readily available from nature however,nowadays, these are already bought and passed down from generations. Capital isthe money used for the production which needs to be returned when one investson something. Labor is the person’s inputs which is very valuable. Entrepreneurshipis how the person transact according to how the people negotiate. And knowledgeis one of human’s invaluable efforts of giving the ideas.

Final answer:

The five factors of production are land, labor, capital, entrepreneurship, and knowledge. These are the resources necessary for the production of goods and services. Each factor represents a different type of resource used in the production process.

Explanation:

The five factors of production include land, labor, capital, entrepreneurship, and knowledge. These are the resources used in the creation of goods and services. Land refers to all natural resources used to produce goods and services, Labor is the effort people contribute to the production of goods and services, Capital includes all the resources made and used by people to produce and distribute goods and services, Entrepreneurship is the willingness and ability to take the risks involved in starting and managing a business, and Knowledge is the understanding and skills that people acquire through education, training and experience.

Learn more about Factors of Production here:

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Where is the water table located?A. Below the layer of bedrock
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D. At the top of the zone of saturation

Answers

The Water table is located D.at the top of the zone of saturation.

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