Answer:
Energy is the tendency to do work.
Explanation:
Energy unit is Joule
1 Joule means 1 kgm²/s²
Energy =Kinertic energy
=1/2 mv²
unit= kgm²/s²
So energy unit is derived unit.
Answer:
Its internal energy decreases by 40 J.
Explanation:
The energy supplied to the metal block causes the temperature of the block to rise. Therefore,
Now, we will use this value of mC to find out the energy change of block:
It shows that when the temperature of the metal block falls by 10°C,
<u>Its internal energy decreases by 40 J.</u>
They can continue moving without the need of an external force
Explanation:
Newton's first law of motion states that:
"An object in motion at constant velocity (or at rest) will continue moving at constant velocity (or will stay at rest) unless acted upon an external force"
In normal daily life, we normally experience something different: when we throw an object on a table, for instance, we notice that the object will eventually stop, instead of keep moving. This is because there is another force acting on the object, the force of friction, opposite to the motion, that "resists" the motion of the object eventually bringing it to a stop.
In space, however, there is no force of friction or air resistance. Therefore, Newton's first law can be applied: and so, if space travellers are in a ship, and this ship is moving at a certain constant velocity, it will keep moving at this velocity without slowing down, and no external force would be needed in order to keep the ship in motion.
Learn more about Newton laws of motion:
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F(friction) = u F(normal)
so, F(friction) = (.30)(60*9.81) = 177 N
F = ma
so, 177 = (60)a, a = 177/60 = 2.9m/s^2
v(final)^2 = v(initial)^2+2ax
so, 0 = 1.5^2 + 2(-2.9)x, x = 2.25/(2*-2.9) = -.38793 the negative indicates that the direction of accel is opposite of direction of speed.
-0.39 meters is the answer.
Answer:2250J
Explanation:
mass(m)=20kg
velocity(v)=15m/s
Kinetic energy=(m x v^2)/2
Kinetic energy =(20 x 15^2)/2
Kinetic energy =(20x15x15)/2
Kinetic energy=4500/2
Kinetic energy=2250J
