What an object has its motion changed the cause is generally?
When an object has its motion changed, the cause is generally an external force. The answer is letter A. It follows Newton’s second law of motion wherein a body is at rest and remains at rest without an external force applied to move the body.
What’s the measure of an object’s mass and velocity called?
momentum
Which object would have the most momentum?
Two objects of different mass are moving at the same speed; the more massive object will have the greatest momentum. A less massive object can never have more momentum than a more massive object. Two identical objects are moving in opposite directions at the same speed.
What would happen if while wearing rollerskates you pushed as hard as you could against a wall Why does this happen?
Describe what would happen if, while wearing rollerskates, you pushed as hard as you could against a wall. Why does this happen? Because the wall is solid and grounded, and the pusher is wearing roller skates, the pusher would end up rolling in the direction opposite to the force of the push.
When the force on an object increases so does its?
From Newton’s second law the force on an object is related to the acceleration. The acceleration is directly proportional to the force applied to an object. For an object whose mass remains constant, when the force increases the acceleration increases. When the force on an object increases, so does its acceleration.
Is air affected by human movement?
Air has mass, but not inertia. C. Air is not affected by human movement.
Which type of air pollution is most difficult to measure from space?
Clouds, variations between land and water, and the three-dimensional structure of the atmosphere make it difficult to measure air pollution from space. These images, collected on April 13, 2014, compare a natural-color view of of Southeast Asia to the measured concentration of aerosols.
What are major sources of pollution?
The main sources of pollution are household activities, factories, agriculture and transport. Once they have been released into the environment, the concentration of some pollutants is reduced by dispersion, dilution, deposition or degradation.
What kind of information is provided by the Air Quality Index?
It tells how clean or polluted the air is, and what associated health effects might be a concern, especially for ground-level ozone and particle pollution. Think of the AQI as a yardstick that runs from 0 to 500. The higher the AQI value, the greater the level of air pollution and the greater the health concern.
What are the six levels of air quality?
These six pollutants are carbon monoxide, lead, nitrogen oxides, ground-level ozone, particle pollution (often referred to as particulate matter), and sulfur oxides.
What time of day has the best air quality?
Time of Day Pollution Data Instead of during the quiet of night, it’s the afternoon–right around rush hour–that PM2. 5 is the lowest. So if you’re planning a picnic or insist on exercising outside, you’re usually best off between noon and 6pm.
What two factors are monitored daily through the Air Quality Index?
Who issues it: EPA uses two algorithms, called “NowCasts,” to relate hourly readings from air quality monitors to the AQI for ozone and the AQI for particle pollution. What pollutants it covers: EPA calculates a NowCast for two pollutants: ozone and particle pollution.
What is the ideal air quality?
AQI values at or below 100 are generally thought of as satisfactory. When AQI values are above 100, air quality is unhealthy: at first for certain sensitive groups of people, then for everyone as AQI values get higher. The AQI is divided into six categories.
Is it bad to run in bad air quality?
Exercising outdoors in areas with increased air pollution is not advised, according to the World Health Organization, because the increased respiration also increases the amount of harmful particles coming into your lungs. Pollution can also undo some of the benefits of exercise.
What is the best air quality index number?
How does the AQI work? Think of the AQI as a yardstick that runs from 0 to 500. The higher the AQI value, the greater the level of air pollution and the greater the health concern. For example, an AQI value of 50 or below represents good air quality, while an AQI value over 300 represents hazardous air quality.
Where is the best air quality in the world?
Which is the cleanest country in the world?
| # | country | 2020 AVG. US AQI |
|---|---|---|
| 1 | Puerto Rico | 15 |
| 2 | New Caledonia | 15 |
| 3 | U.S. Virgin Islands | 15 |
| 4 | Sweden | 21 |
What is bad air quality index?
AQI values at or below 100 are generally thought of as satisfactory. When AQI values are above 100, air quality is considered to be unhealthy—at first for certain sensitive groups of people, then for everyone as AQI values increase.
Where is the cleanest air in the US?
Finally, here are the cities with the cleanest air in the United States by short-term and year-round pollution.
- Bangor, Maine.
- Burlington-South Burlington-Barre, Vermont.
- Honolulu, Hawaii.
- Wilmington, North Carolina.
Where is the cleanest air on Earth?
Researchers say they’ve identified the cleanest air on the planet – free from particles caused by human activity – over the Southern Ocean, which surrounds Antarctica. The Southern Ocean.
Where is the best air quality in us?
These six cities have the cleanest air in the US
- Bangor, Maine.
- Burlington-South Burlington, Vermont.
- Honolulu, Hawaii.
- Lincoln-Beatrice, Nebraska.
- Palm Bay-Melbourne-Titusville, Florida.
- Wilmington, North Carolina.
Which city has cleanest air?
10 cities with the cleanest air in India
| Rank | City | PM2.5’s 2019 average (µg/m³) |
|---|---|---|
| 1 | Satna (Madhya Pradesh) | 15.5 |
| 2 | Kumbhori (Maharashtra) | 20.3 |
| 3 | Haldia (West Bengal) | 25.9 |
| 4 | Tirupati (Andhra Pradesh) | 26.4 |
What is the cleanest country in the world?
Denmark
Which city has worst air quality?
Air quality in the database is represented by the annual mean concentration of particulate matter (PM10 and PM2. 5, i.e. particles smaller than 10 or 2.5 micrometers, respectively)….List of most-polluted cities by particulate matter concentration.
| Position | 1 |
|---|---|
| Country | India |
| City/Town | Kanpur |
| Year | 2016 |
| PM2.5 | 173 |
Which is the cleanest city in the world?
The world’s cleanest cities
- #1: CALGARY. Calgary in Canada is the world’s cleanest city, and with a population of more than a million, that’s quite something.
- #2: ZURICH. Zurich in Switzerland attracts thousands of tourists every year, especially those who enjoy the winter snow.
- #3: LUXEMBOURG.
- #4: ADELAIDE.
- #5: SINGAPORE.
Which is the most peaceful city in the world?
Singapore Singapore is probably the most orderly city state in the world.
What is the 2nd most beautiful capital in the world?
Islamabad
Which is the world’s most polluted country?
South Asia most polluted region South Asia is the most polluted region in the world with Bangladesh, India and Pakistan together home to 42 of the 50 most polluted cities..
What are the top 5 most polluted countries?
- The silent killer. Dipak Shelare/Shutterstock.
- Most polluted – Vietnam: PM2. 5 concentration 34.1 µg/m3 in 2019.
- Bosnia and Herzegovina: 34.6 µg/m3 in 2019.
- Kuwait: 38.3 µg/m3 in 2019.
- United Arab Emirates: 38.9 µg/m3 in 2019.
- China: 39.1 µg/m3 in 2019.
- Iraq: 39.6 µg/m3 in 2019.
- Uzbekistan: 41.2 µg/m3 in 2019.
What are the 10 most polluted places on earth?
The Top 10 worst polluted places in the world based on the 2013 report are:
- Agbogbloshie, Ghana.
- Chernobyl, Ukraine.
- Citarum River, Indonesia.
- Dzershinsk, Russia.
- Hazaribagh, Bangladesh.
- Kabwe, Zambia.
- Kalimantan, Indonesia.
- Matanza Riachuelo, Argentina.
Which is the most polluted city in the world 2019?
World air quality report
| Rank | City | 2019 AVG |
|---|---|---|
| 1 | Hotan, China | 110.1 |
| 2 | Ghaziabad, India | 110.2 |
| 3 | Bulandshahr, India | 89.4 |
| 4 | Bisrakh Jalalpur, India | – |