You could use an elevator or the stairs to lift a box to tenth floor.which has greater power?
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Stairs don't have any power at all. All the energy used to climb them
has to come from your muscles.
An elevator gets its power from the electric motors that lift it. All YOU
have to do is stand there and look around.
All of this is a big part of the reason why elevators have become so
popular, and why no buildings with more than a few floors were built
before elevators were invented.
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Elements that easily transmit electricity and heat display the property know as ______
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3. You shoot an arrow straight up into the air with a velocity of 25 m/s.a. What is the velocity of the arrow at its peak?b. How high did the arrow go?c. How long is the arrow in the air?
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loses electrons.
gains electrons.
gains neutrons.
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An element becomes a positively charged ion when it losses electron.
What is electric charge?
Charged material experiences a force when it is exposed to an electromagnetic field due to the physical property of electric charge. You can have a positive ornegative electric charge (commonly carried by protons and electrons respectively). Unlike charges attract one another while like charges repel one another. Neutral refers to an object that carries no net charge.
Electric charge is a conserved attribute, meaning that the net charge—that is, the sum of the positive and negative charges in an isolated system—cannot change. Subatomic particles carry an electric charge. In the nuclei of atoms, protons have positive charge and electrons carry negative charge in normal matter.
So, an element becomes a positively charged ion when it loses negative charge, that is, electron.
Learn more about electric charges here:
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when was slate found
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hope it helped
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Answer:
The acceleration of the object is 0.5 m/s²
a is correct.
Explanation:
Given that,
Mass of object = 5.0 kg
Acceleration
Using newton's second law
The force is the product of the mass of the object and acceleration.
Put the value of m and a
Now, The same force would give a 20 kg object
So, Using newton's second law again
The acceleration is
Put the value of m and F
Hence, The acceleration of the object is 0.5 m/s²
opposite to the net force
left
opposite to motion
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The friction arrow in an FBD for a moving object point is in opposite way to motion. Because friction always works in the opposite direction of the motion of the object.
Answer: Option D
Explanation:
When two object come into contact, the contact force come into play. Now, one component of the contact force i.e. the normal forces act perpendicularly at the direction of motion. Whereas, the frictional forces always acts parallel at the direction of the force acting on the object but in the opposite way.
For example, if we slide a book on the table to the right hand side, the exact equal and opposite frictional force will induce in the opposite direction, tempting to reduce the motion.