# How High Is 2 Meters

How High Is 2 Meters – Example 32 A man 2 meters tall walks at a constant speed of 5 km/h from a lamppost 6 meters high. Find the rate at which the length of its shadow is increasing. Let AB be a lamp post and MN be the height of a person 2 m. & AM = x meters & MS is the man’s shadow Let the length of the shadow MS = s meters Considering a man walking at a speed of 5 km/h ∴ 𝒅𝒙/𝒅𝒕 = 5 km/h We have to find the speed at which the length of the shadow increases . i.e. we need to find 𝒅𝒔 / 𝟐 / 𝒔 6s = 2x + 2s 6s – 2s = 2x 4s = 2x2s = x x = 2s We need to find 𝑠/𝑑𝑡 Now x = 2s Diff tw. (2𝑠 ) / 2 So, /𝟐 km/hr.

Davneet Singh completed his BSc from the Indian Institute of Technology, Kanpur. He has been teaching for the last 13 years. It offers courses in mathematics, natural sciences, social sciences, physics, chemistry, computer science.

## How High Is 2 Meters

Display advertising is our only source of revenue. To help create more content and view an ad-free version of o…, purchase a black subscription.Seasonal (3-month) sea level estimates from Church and White (2011) (light blue line) and University Express Delivery Hawaii sea level data (dark blue). Values ​​are shown as sea level change in millimeters from 1993–2008. on average. NOAA image based on analysis and data by Philip Thompson of the University of Hawaii Sea Level Center.

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Global mean sea level since 1880 rose about 8 to 9 inches (21 to 24 centimeters). The rise in water levels is mainly due to the melting of glaciers and ice sheets and the thermal expansion of seawater as it warms. in 2021 mean global sea level was 97 millimeters (3.8 in) higher than in 1993, making it the highest annual mean in the satellite record (1993 to present).

Global mean ocean water level 2006–2015. rose 0.14 inches (3.6 millimeters) per year, 2.5 times the average rate of 0.06 inches (1.4 millimeters) per year during most of the 20th century. By the end of the century, global average sea levels are expected to rise at least one foot (0.3 meters) above 2000 levels. level, even if greenhouse gas emissions are relatively low in the coming decades.

In some ocean basins, sea level has risen as much as 6-8 inches (15-20 centimeters) since the satellite record began. Regional differences exist due to natural variations in the strength of ocean winds and currents, which influence how much and where the deeper layers of the ocean store heat.

1993-2021 average sea level has risen in many of the world’s oceans (blue). Sea levels rose 6 to 8 inches (15 to 20 centimeters) in some ocean basins. Prices from

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Sea ​​level (spots) along a coast can be higher than the global average due to geological processes such as land subsidence, or lower than the global average due to processes such as the recovery of centuries-old land masses due to the loss of old glaciers. ice The map was created by NOAA based on data provided by Philip Thompson of the University of Hawaii.

Past and future sea-level rise in certain land areas may be higher or lower than the global average due to local factors: land settlement, upstream flood control, erosion, regional ocean currents, and whether the land is still recovering from the compressive pressure of ice age glaciers. In the United States, the Gulf of Mexico west of the mouth of the Mississippi is experiencing the fastest sea level rise, followed by the mid-Atlantic. Sea level is falling only in Alaska and a few parts of the Pacific Northwest, although this trend will reverse as greenhouse gas emissions increase.

In the United States, nearly 30 percent of the population live in relatively densely populated coastal areas where sea level affects flooding, coastal erosion and storm surge. According to the United Nations Ocean Atlas, 8 of the world’s 10 largest cities are located near the coast.

South Beach, Miami, 2007 May 3 Photo by Flickr user James Williamor under a Creative Commons license.

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In cities along coasts around the world, rising seas threaten the infrastructure needed for local jobs and regional industry. Roads, bridges, subways, water supplies, oil and gas wells, power plants, sewage treatment plants, landfills—the list is almost endless—are threatened by sea level rise.

Higher background water levels mean that deadly and destructive storm surges, such as those associated with Hurricane Katrina, Superstorm Sandy and Hurricane Michael, are pushed further inland than before. Higher sea levels also mean more frequent floods and high tides, sometimes called “harmful floods” because they are not usually deadly or dangerous, but they can be dangerous and costly. (Use Explorer, part of the US Resilience Toolkit, to explore past and future flood inundation rates for locations across the US.)

Destructive floods in Annapolis in 2012. The number of floods in the United States has increased dramatically over the past 50 years. Photo by Amy McGovern.

In nature, sea-level rise puts stress on coastal ecosystems that provide recreation, storm protection, and habitat for fish and wildlife, including commercially valuable fisheries. As seas rise, saltwater also contaminates freshwater aquifers, many of which support urban and agricultural water supplies and natural ecosystems.

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Global warming causes average sea level to rise in two ways. First, glaciers and ice sheets around the world are melting and adding water to the ocean. Second, as the water warms, the volume of the ocean expands. A third, much smaller driver of sea level rise is the reduction of liquid water on land – in aquifers, lakes and reservoirs, rivers, and soil moisture. This movement of liquid water from land to ocean is largely due to groundwater pumping.

Pedersen Glacier, Aialik Bay, Kenai Mountains, Alaska, 1917. (left) and 2005 (on the right). At the beginning of the 20th century, the glacier met the water and the icebergs poured into a marginal lake near the bay. Until 2005 the glacier retreated, leaving sediments that allowed the lake to become a small meadow. Photographs by Louis H. Pedersen (1917) and Bruce F. Molina (2005) from the Glacier Photograph Collection, Boulder, Colorado USA: National Snow and Ice Data Center/World Glacier Data Center. Large Images: 1917 | in 2005

Between the 1970s and the last decade, melting and thermal expansion contributed more or less equally to the observed sea-level rise. However, the melting of mountain glaciers and ice sheets has accelerated:

As a result, in 2005-2013 sea-level rise due to melting (with the addition of minor groundwater displacement and other shifts in water storage) was nearly twice as much as sea-level rise due to thermal expansion.

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In 2015 July 19 Melt flows of the Greenland ice sheet. The loss of the Greenland and Antarctic ice sheets and the Alpine glaciers has accelerated in recent decades. NASA photo by Maria-José Viñas.

Sea level is measured by two main methods: tide gauges and satellite altimeters. Tide gauge stations around the world have been measuring daily tides for over a century using a variety of manual and automatic sensors. Using data from many stations around the world, scientists can calculate a global average and adjust it for seasonal variations. Since the early 1990s, sea level has been measured from space using radar altimeters, which determine the height of the sea surface by measuring the return speed and intensity of a radar pulse directed at the ocean. The higher the sea level, the faster and stronger the return signal.

Observed sea level since the beginning of the satellite altimeter record in 1993. (black line), as well as independent estimates of the various contributions to sea-level rise: thermal expansion (red) and additional water, mainly due to melting glaciers (blue). Together (purple line), these individual estimates agree very well with observed sea level. NOAA graphic adapted from Figure 3.15a, 2018.

To estimate how much of the observed sea level rise is due to thermal expansion, scientists measure sea surface temperatures using moored and drifting buoys, satellites, and water samples collected by ships. The temperature in the upper part of the ocean is measured by the global fleet of water robots. Deeper temperatures are measured by instruments launched from oceanographic research vessels.

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To estimate how much sea level has risen as a result of actual mass transfer—the movement of water from land to ocean—scientists rely on direct measurements of melt rates and glacier heights from field surveys and satellite measurements. from very small displacements of the Earth’s gravitational field. As water moves from land to ocean, the increase in mass slightly increases the force of gravity over the oceans. Based on these gravitational shifts, the scientists calculated

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