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Anettt [7]
3 years ago
13

An isotope of cesium (cesium-137) has a half-life of 30 years. If 4.0 mg of cesium-137 decays over a period of 120 years, how ma

ny mg of cesium-137 would remain?
Advanced Placement (AP)
1 answer:
inna [77]3 years ago
5 0

Answer:

.,no entiendo ni mierda

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An aircraft is climbing at a 30 degree angle to the horizontal. How fast is the aircraft gaining altitude if it's speed is 500 m
denis-greek [22]

Answer:

The aircraft is gaining altitude at 250\frac{mi}{h}

Explanation:

Draw a vector diagram. (Right angle triangle speed as the hypotenuse)

Let

x -----> horizontal component of the speed

y ----> vertical component of the speed

s ----> speed in miles per hour

we know that

x=cos(30\°)(s)

y=sin(30\°)(s)

we have

s=500\ \frac{mi}{h}

cos(30\°)=\frac{\sqrt{3}}{2}

sin(30\°)=\frac{1}{2}

substitute

x=\frac{\sqrt{3}}{2}(500)

x=250\sqrt{3}\frac{mi}{h}

y=\frac{1}{2}(500)

y=250\frac{mi}{h}

therefore

The aircraft is gaining altitude at 250\frac{mi}{h}

7 0
3 years ago
If, as the world has long agreed, a very great amount of instruction will not make a wise man, still less will a very mediocre a
Black_prince [1.1K]

Answer:

D. it reveals the woman’s thoughtful consideration of the effects of her own behavior on others

4 0
3 years ago
Why would a town planner use a map at the 1:24,000 scale rather than a map at the 1:250,000 scale? The map at the 1:24,000 scale
Artemon [7]

Answer:

A The map at the 1:24,000 scale is easily converted to non-metric measurements.The map at the 1:24,000 scale shows the town close-up in more detail.

Explanation:

  • A scale of ration 1: 24,000 indicates that the distance on the map to the actual ground distance is large scale map and shows are a detailed close-up of the map. Also, they can be easily converted and thus a town planner decides to make use of this map for planning.
3 0
3 years ago
What is the effect of non-agricultural uses of land in the society
frutty [35]

Answer:

  • Land development creates impervious surfaces through construction of roads, parking lots, and other structures. Impervious surfaces:
  • Contribute to nonpoint source water pollution by limiting the capacity of soils to filter runoff.
  • Affect peak flow and water volume, which heighten erosion potential and affect habitat and water quality.
  • Increase storm water runoff, which can deliver more pollutants to water bodies that residents may rely on for drinking and recreation.1 Storm runoff from urban and suburban areas contains dirt, oils from road surfaces, nutrients from fertilizers, and various toxic compounds.
  • Affect ground water aquifer recharge.

Explanation:

please mark brainlist

6 0
2 years ago
What are some major characteristics of global cities???
Juliette [100K]
I think that this can be answered in multiple ways because there is not a right answer to this specific question. But I think that some characteristics is that they have be industrial, because if a place can not produce then it can not stand, and I also think that it is defined by how much power the city has economically and physically producing. 
7 0
3 years ago
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