1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
dedylja [7]
3 years ago
5

Skydivers jump out of planes with only the backpacks on their backs. Of course, these packs contain the parachutes that keep sky

divers from falling to Earth too quickly.
When a skydiver opens his parachute, he suddenly stops falling so fast. What force does the parachute help supply that causes this?
A) The drag force.
B) The thrust force.
C) The friction force.
D) The force of gravity.
Chemistry
2 answers:
UkoKoshka [18]3 years ago
8 0

the force of gravity

tangare [24]3 years ago
5 0

A) the drag force is the most logical ⊂:

You might be interested in
Nitrogen effuses through a pinhole 1.7 times as fast as another gaseous element under the same conditions. Estimate the other el
marysya [2.9K]

Answer:

80.92, Krypton

Explanation:

<u>What is effusion?</u>

• It is a process where gas escapes through a pinhole (a very small hole) into a region of low pressure or vacuum

<u>Graham's law of effusion of </u><u>gas</u>

• states that at a given constant temperature and pressure, the rate of effusion of gases is inversely proportional to the square root of their molar masses

\boxed{ \frac{Rate_1}{Rate_2} =  \sqrt{ \frac{M_2}{M_1} } }

<u>Calculations</u>

Nitrogen exist as N₂ at room temperature, thus its molar mass is 2(14)= 28.

Let the rate and molar mass of unknown gas be Rate₂ and M₂ respectively.

Since N₂ effuses 1.7 times as fast as the unknown gas,

Rate₁= 1.7(Rate₂)

\frac{Rate_1}{Rate_2} = 1.7

1. 7 =  \sqrt{ \frac{M_2}{28} }

Square both sides:

2.89  = \frac{M_2}{28}

Multiply both sides by 28:

2.89(28)= M₂

M₂= 80.92

<u>Identity of </u><u>gas</u>

The molar mass of 80.92 lies between Bromine and Krypton. However since Bromine exist as Br₂, the value of it's molar mass would be 159.8 instead. Hence, Bromine is eliminated.

If the gas is a diatomic element, the atomic weight is 80.92 ÷2= 40.46. Thus, we are now considering if Argon could be its identity. However, Argon is a noble gas and will not exist as a diatomic element. Argon is therefore eliminated too.

Thus based on the above reasoning, its probable identity is Krypton.

7 0
2 years ago
I need help..would it be A???
Dovator [93]

Answer:

probably

Explanation:

Because fossil fuel is the main fuel source, so any fuels that are not fossil fuels are alternative.

7 0
3 years ago
When heated, mercury oxide produces oxygen plus mercury. What would be the combined mass of oxygen and mercury if 20g of mercury
vivado [14]
<span>Releasing the oxygen from the mercury does not change the mass. If you started with 20 g total you would still have 20 g total after the heating</span>
7 0
3 years ago
1. A crane lifts a 75kg mass a height of 8 m. Calculate the gravitational potential energy
koban [17]

Answer:

GP.E = 5880 j

Explanation:

Given data:

Mass = 75 kg

height = 8 m

Potential energy = ?

Solution:

The formula for gravitational potential energy is

GPE = mgh

m = mass in kilogram

g = acceleration due to gravity

h = height in meter above the ground

Formula:

GP.E = mgh

Now we will put the values in formula.

g = 9.8 m/s²

GP.E = 75 Kg × 9.8 m/s²× 8 m

GP.E = 5880 Kg.m²/s²

Kg.m²/s² = j

GP.E = 5880 j

6 0
2 years ago
What is the law of Conservation of mass ?​
Ahat [919]
The Law of Conservation of Mass states that energy can neither be created nor destroyed in a chemical reaction.
5 0
2 years ago
Other questions:
  • Which statement describes how technology has increased our information on Mars?
    10·2 answers
  • How do you identify a mineral there are six things
    12·1 answer
  • Magnesium oxide decomposes into magnesium and oxygen. if 16.12 g of magnesium oxide decomposes to form 9.72 g of magnesium, what
    12·1 answer
  • Workers in coal mines use battery operated torch lights instead of lanterns. What is the reason?
    5·1 answer
  • The temperature and number of moles of a gas are held constant. Which of the following is true for the pressure of the gas?
    11·1 answer
  • A manufacturing plan has been found guilty of polluting the nearby river. this is pollution
    15·1 answer
  • A participant took 5.2 hours to complete a marathon. How many minutes did the participant take to complete the marathon? Use 1 h
    11·2 answers
  • Carbonate oxidation number
    9·1 answer
  • 152 2s22p6 3s2 3pó 452 3d5
    11·1 answer
  • How many moles are in 59.6 grams of BaSO4​
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!