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yanalaym [24]
3 years ago
8

Why are noontime shadows longer in winter than in summer?

Chemistry
1 answer:
dangina [55]3 years ago
5 0
Because the Earth's axis is tilted slightly and the rays are coming at different angle.
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you run 1 3/4 miles each day. your friend runs 4 times as far as you. how far does your friend runs each day
djverab [1.8K]
1 3/4 * 4 = 7

Your friend runs 7 miles each day.
8 0
3 years ago
What happens when wind sweeps up sand and throws it against a big rock?
RideAnS [48]
In deserts, wind often causes weathering by blowing sand and other material against cliffs and large rocks. This wears them down and creates more bits of sand and dust. Over time, the rock is scraped and polished away. ... When a gust of wind blows, it picks up sand and other bits of material.
4 0
3 years ago
A helium balloon contains 0.40 g of helium. given the molecular weight of helium is 4.0 g/mol, how many moles of helium does it
Rasek [7]

Answer is 0.10 mol.


<em>Explanation;</em>


n = m/M


Where n is number of moles (mol), m is the mass of substance (g) and M is the molar mass of the substance (g/mol).


n = ?

m = 0.40 g

M = 4.0 g/mol


From substitution,

n = 0.40 g /4.0 g/mol

n = 0.10 mol


Hence, the balloon has 0.10 mol of He.

8 0
3 years ago
How many moles of NH4NO3(s) must be dissolved in water so that 73.0 kJ of heat is absorbed from the water? (The molar heat of so
fenix001 [56]
25 kj  absorbed  by  dissolving  1 mole of  NH4NO3

1kj  is   absorbed  by  dissolving =  1/25.7 =  0.03891  moles
what  about  73  kj  absorbed  by  dissolving

0.03891  x73=  2.8404 moles

3 0
3 years ago
Read 2 more answers
When a scientific theory has been tested and proved by the scientific community, it becomes a law. True or False
LekaFEV [45]

Answer:

False

Explanation:

Because laws and theories are developed for different purposes, laws never become theories, and theories do not become laws.  

7 0
4 years ago
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