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Colt1911 [192]
3 years ago
14

Write a paragraph about Space Manned Exploration (100 pts)

Chemistry
2 answers:
sashaice [31]3 years ago
8 0
Space Manned Exploration, more commonly known as Human spaceflight, is a type of space travel that launches to space with a spacecraft, including crews or regular passengers. The very first launching program that NASA made was back in 1958 was the Project Mercury with the goal for the first human put into Earth's orbit to survive and come back safely. Other famous spaceflights include the 1969's first moon landing of <span>Neil Armstrong and Edwin "Buzz" Aldrin. Today, NASA has confirmed another attempt to make a spaceflight to the moon in 2020 or 2023. We aren't far from those dates, so let's see what they can do! 


</span>
Ray Of Light [21]3 years ago
6 0

In the very beginning of the era of space exploration each new discovery definitely weighed a lot. The humanity has learnt many new amazing things and it is natural that we want to know more and more. However, do we have enough technology and intelligence for it?

Sian Meaney, a journalist and researcher at Cherwell College in Oxford, the UK, writes that such giants as China and Russia have recently made no claims to the scientific benefits of manned missions. Nevertheless, space exploration takes the money that could be spent on the development of “earthly” sciences, or on the exploration of the planet Earth itself.

The supporters of manned space missions argue that it is so natural for the human to explore new territories and acquire new knowledge. But don’t the secrets of our planet suffice to satisfy scientists’ interest? Can’t complex human body and soul be the main subjects of heavily invested studies? We still do not know the entire truth about our world. So, how dare we intrude on the one where our laws do not work?

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students used a balance and a graduated cylinder to collect the data shown in table 7. calculate the density of the sample. if t
Licemer1 [7]

Answer:

              Percentage error  =  1.88 %

Solution:

Data Given:

                 Mass of Sample  =  20.46 g

                 Volume of Sample  =  43.0 mL - 40.0 mL  =  3.0 mL

Formula Used:

                 Density  =  Mass / Volume

Putting values,

                 Density  =  20.46 g /  3.0 mL

                 Density  =  6.82 g.mL⁻¹

Percentage Error:

                 Experimental Value  =  6.82 g.mL⁻¹

                 Accepted Value  =  6.95 g.mL⁻¹

                 = 6.82 g.mL⁻¹ / 6.95 g.mL⁻¹ × 100  =  98.12 %

                 Percentage Error  =  100 % - 98.12 %

                Percentage error  =  1.88 %

3 0
3 years ago
The half-life of a pesticide determines its persistence in the environment. A common pesticide degrades in a first-order process
denis23 [38]

Answer:

0.1066 hours

Explanation:

A common pesticide degrades in a first-order process with a rate constant (k) of 6.5 1/hours. We can calculate its half-life (t1/2), that is, the times that it takes for its concentration to be halved, using the following expression.

t1/2 = ln2/k

t1/2 = ln2/6.5 h⁻¹

t1/2 = 0.1066 h

The half-life of the pesticide is 0.1066 hours.

7 0
3 years ago
What is the element that is in period 5 and group 3?
rjkz [21]

Answer:

Rubidium

Rubidium is the first element placed in period 5. 

6 0
3 years ago
Calculate the amount of heat required to completely sublime 55.0 g of solid dry ice CO2 at its sublimation temperature. The heat
aliina [53]

Answer:

40.4 kJ

Explanation:

Step 1: Given data

  • Mass of CO₂ (m): 55.0 g
  • Heat of sublimation of CO₂ (ΔH°sub): 32.3 kJ/mol

Step 2: Calculate the moles corresponding to 55.0 g of CO₂

The molar mass of CO₂ is 44.01 g/mol.

n = 55.0 g × 1 mol/44.01 g = 1.25 mol

Step 3: Calculate the heat (Q) required to sublimate 1.25 moles of CO₂

We will use the following expression.

Q = n × ΔH°sub

Q = 1.25 mol × 32.3 kJ/mol = 40.4 kJ

7 0
2 years ago
The following properties are either physical or chemical. Which one is different from the rest based on those two categories? (5
Yuliya22 [10]

Answer:

The following properties are either physical or chemical. Which one is different from the rest based on those two categories? We chose all of the above

4 0
3 years ago
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