Answer:
1890J
Explanation:
375+45 = 420kg (total mass)
kinetic energy = 1/2 × mass × velocity²
1/2 × 420 × 3² = 1890J
Astronauts need special tools to work in space. One specially designed tool that astronauts use is a screwdriver. Using Newton’s third law of motion, explain why it might be difficult to use a normal screwdriver to tighten a screw in space.
Astronauts need a specially designed tool that astronauts use as a screwdriver. Using Newton’s third law of motion, we can easily explain the fact of microgravity in space that makes difficult to use a normal screwdriver to tighten a screw in space.
What is microgravity?In a situation known as microgravity, persons or objects appear to be weightless. When astronauts and items float in space, one can observe the consequences of microgravity.
Unless acted upon by an imbalanced force, an object at rest will remain so, while an object in motion will maintain its speed. An object's propensity to resist changes in velocity, whether it's moving or not, is known as inertia.
In space compared to Earth, using a hand-held driver to spin a screw is a little trickier. On earth, gravity serves to secure a person's complete body to the surface. Turning a screw is a straightforward process. One uses one hand to turn the screw while standing on the ground.
Twisting a screw becomes difficult if one is free floating in a spaceship or space station cabin because, depending on the amount of friction present, it's possible that the person turning the screw is also turning themselves. That's why it might be difficult to use a normal screwdriver to tighten a screw in space.
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What are TWO costs of using tides for energy?
Sorry for the caps, I have been looking through answers and the answers never have 2 costs, only one.
Answer: Hello!!! It is me again!!! Here is the answer: The Bill and Melinda Gates Foundation hires you as a consultant to determine how best to use $20 billion to save the world and make it a better place … You cannot spend $1 on yourself or your family. :) Please mark me as Brainliest :) :) :)
Explanation:
What is the main reason for running one experiment that has an independent variable and running one variable with everything the same except that it does not have the independent variable?
Answer:
when you run one experiment and it is off and then do the same experiment again that makes it not have a independent variable.
Explanation:
When a ball bounces back when you throw it at a wall, what occurs?
A- refraction
B- reflection
C- diffraction
D- absorption
Answer:
a (refraction) i think
Explanation:
Which best describes electromagnetic waves?
A. transverse waves made up of electric and magnetic fields
B. longitudinal waves made up of vibrations that move through matter
C. mechanical waves that travel as ripples in water
D. sound waves that can only travel in a medium
Answer:
A
Explanation:
hope this helps!!!!!!!
Answer:
A
Explanation:
Electromagnetic waves differ from mechanical waves in that they do not require a medium to propagate. This means that electromagnetic waves can travel not only through air and solid materials, but also through the vacuum of space.
they are transverse waves.
Everything in the world has the same density. True or False?
Which of the following statements about digestion is/are TRUE? (Select all that apply.)
Salivary glands are located in the esophagus.
Digestion begins in the mouth.
Saliva changes the starches in food into simple sugars.
Saliva is an enzyme.
Answer:
option 1, 2, and 4
Explanation:
i took the test lol
The true statements are digestion begins in the mouth, saliva changes the starches in food into simple sugars, and saliva is an enzyme. The true options are (2), (3), and (4).
The process of breaking down food mechanically and chemically begins digestion in the mouth. When we consume, our teeth break down the food with chewing motions. By increasing the food's surface area through mechanical means, enzyme function is facilitated.
The digestion of carbohydrates, and starches, depends on the salivary enzyme amylase. When amylase disassembles the lengthy chains of starch molecules into smaller units, it creates maltose, a disaccharide (a form of sugar).
A biological enzyme is a molecular catalyst that speeds up particular chemical reactions without being consumed or changed in the process. Amylase, which was previously noted, is one of the most significant enzymes found in saliva. In the mouth, amylase aids in the first digestion of carbohydrates.
Hence, the true statements are digestion begins in the mouth, saliva changes the starches in food into simple sugars, and saliva is an enzyme. The true options are (2), (3), and (4).
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What types of crust are colliding between the South American Plate and the Nazca Plate?
Answer Choices:
Continental Crust/Continental Crust
Oceanic Crust/Oceanic Crust
Oceanic Crust/Continental Crust
Answer:
Oceanic Crust/Continental Crust
Explanation:
It is a destructive plate boundary between the oceanic crust of the Nazca plate and the continental crust of the South American plate.
An area with many volcanoes that includes the western borders of South, Central, and North America, the southern border of Alaska, and the eastern border of Japan is often called the Ring of Fire. Why did so many volcanoes form in these areas?
help
science
How would you describe your position using reference points?
Answer
A reference point is the starting point you choose to describe the location, or position, of an object. The reference point in the first example is your friend. ... The direction is north, and the reference point is your school. A position is an object's distance in a certain direction from a reference point.
Explanation:
Answer:
A reference point is the starting point you choose to describe the location, or position, of an object. The reference point in the first example is your friend. ... The direction is north, and the reference point is your school. A position is an object's distance in a certain direction from a reference point.
Hope this helps
Which group of organisms came before marsupials?
Only reptiles
Both cats and dogs
Both amphibians and reptiles
Only dogs
Which of these minerals are essential for muscle health? (Select all that apply.)
potassium
sodium
iodine
calcium
Answer:
Potassium and calcium
Explanation:
which of the following snakes have venom that can be fatal to humans?
A.Blue racer
B. Hognose snake
C. both A and B
D. none of the above
Answer:
It's D
Explanation:
Sorry if im wrong, correct me in comments and tell them actual answer if I'm wrong.
Answer:
I think it's C cause i never heard of those snakes
explanation:
Now, imagine that you are helping a library move. You are lifting boxes of books onto a cart. Most of the boxes are full of many books, but one of the boxes was closed, only having a few books in it. You go to lift this box, not knowing it has less mass, with the same amount of force as you used to lift the full boxes. How will the acceleration of this box compare to the acceleration of a full box? Newton’s second law of motion tells us that if the force remains constant and the mass is decreased, the object will accelerate at a faster rate. Because the acceleration increases when the mass decreases, we say that acceleration is inversely proportional to mass.
Give an example of a situation where you might use the mathematical formula for Newton's second law to solve a problem. Explain how the formula would be useful in this situation.
Answer:
25 is it
Explanation:
A book rests on a table. The force of gravity pulls down on the book with a force of 20 newtons. What prevents the books from accelerating downward at 9.8 m/sec2
A) The table presses back up on the book with an equal and opposite force of 20 newtons.
B) The table and the book together are accelerating downwards at 9.8 m/sec2
C) The table presses back up on the book with a force greater than 20 newtons.
D) The inertia of the book holds it up
Answer:
A
Explanation:
the forces are balanced that's why book experiences no net force
Answer:
A
Explanation:
Action/Reaction force!
Book on table, table on book. This particular reaction force is called the Normal Force. The table doesn't push back with more force, or there would be an unbalanced positive force, causing the book to accelerate upward. The forces must be in equilibrium if the acceleration is 0 (rest)
What is the wavelength of a water wave that is moving at 12 m/s with a frequency of 3 Hz?
(p.s: I also have to show my work on this question!)
Answer:
4 meters
Explanation:
The Formula for finding Wavelength is Wavelength= Speed/ Frequency.
Substitute the values into this equation. 12m/s/3= Wavelength
12/3=4
So, the Wavelength is 4 meters
Hope I helped, Brainliest would be appreciated :)
Have a fantastic day!
-Aadi x
URGENT_____The diagram below shows the same model of the greenhouse effect... Select whether each process helps WARM UP or COOL DOWN the Earth's climate. *
The process A helps cool down the earth's climate, whereas the processes B and C, helps warm up.
What is meant by greenhouse effect?When the heat from the Sun is trapped by gases in the Earth's atmosphere, this process is known as the greenhouse effect.
Here,
The Earth is substantially warmer than it would be if there were no atmosphere as a result of the greenhouse effect.
One factor that makes the Earth a sustainable place to live is the greenhouse effect.
Since the manner that the interchange of incoming and outgoing radiation heats the globe is comparable to what happens in a greenhouse, the process is known as the "greenhouse effect."
The warming of the Earth's surface is a result of the greenhouse effect. A portion of the solar energy that enters the Earth's atmosphere is reflected back into space, while the remaining energy is absorbed and re-radiated by greenhouse gases.
Hence,
The process A helps cool down the earth's climate, whereas the processes B and C, helps warm up.
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The diagram below shows the moon at several places in it's orbit around the Earth... At which location would the moon most likely be in a CRESCENT phase (just a sliver of light showing)? *
A
B
C
D
E
F
Answer:At point A.
Explanation:
All the functional parts of the _______________ system are called the alimentary canal.
Excretory
Digestive
Circulatory
Respiratory
Please help and serious answers only please!!
Answer:
#9: Tisa's average speed is 6 meters per second
Lily's average speed is 6 meters per second
#10: Alesia is fastest during the first hour (the first decrease)
Explanation:
rly don't have time to explain if u want me to comment and I'll come back
<3