Why do trains use steel wheels rather than rubber tires? A) Steel wheels provide more grip, making it easier to stop a train.B) Rubber tires don't provide enough friction to allow the train to move.
C) Steel wheels increase friction, thus making it easier to move the load.
D) Steel wheels reduce friction, thus requiring less force to move the load.
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Welll ... we can do the math and the physics and get an answer
for you, but then we'll really want to step back into the real world
and see how feasible all of this is.
Kinetic Energy = (1/2) (mass) (speed)²
= (1/2) (1 kg) (30 m/s)²
= (1/2) (1 kg) (900 m²/s²)
= 450 kg-m²/s² = 450 joules .
That's the KE of the ball at the instant it leaves your hand,
moving at 30 m/s . Immediately after that, we don't know
what happens to it. It may lose speed, if you tossed it upward,
or it may gain speed, if you tossed it downward or horizontally.
As soon as its speed changes, so does its KE.
And now, a word from the real world:
' 30 m/s ' is about 67 miles per hour, and the ball weighs a little
over 2 pounds. Do you really think you could make that toss ?
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their speed, which is the speed of light
B. Proton
C. Molecule
D. Atom
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The particle which is transferred from one object to another to create a static charge is the electron.
What is an element?
An element is a substance which cannot be split into simpler units by ordinary process.
Below are few examples of elements in the periodic table:
- Hydrogen
- Helium
- Lithium
- Beryllium
- Boron
- Carbon
- Nitrogen
- Oxygen
- Fluorine
- Neon
- Sodium
- Magnesium
- Aluminum
- Silicon
- Phosphorus
Learn more about electrons and elements:
#SPJ1
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Hello!
The answer is: The voltage is 5400 Volts.
Why?
We can calculate the voltage using the Ohm's Law.
The Ohm'ws Law states that:
Where,
V, is the voltage in volts
I, is the current in amps
R, is the resistance in ohms
We are given:
Now, calculating the voltage, we have:
Hence, the voltage is 5400 Volts.
We can also calculate the power using the following formula:
Where,
P, is the power in watts
V, is the voltage in volts
I, is the current in amps
So,
Have a nice day!
guessing from context
B.
previewing
C.
skimming
D.
taking notes