Before we start thinking about the snowball, we need to remind
each other that energy is "conserved". That means that if you
ever see energy decrease in one place, then the missing amount
must have gone somewhere, and if you ever see energy increase
in one place, then the energy that appeared must have come from
somewhere. Energy does not magically appear or disappear.
So you toss a snowball out of your hand. As you let it go, you give
it some kinetic energy, and it starts rolling along the ground.
Once you let go of it, it can't get any more energy (unless it has
some kind of little tiny engine inside it).
Kinetic Energy = (1/2) (mass) (speed)² .
and that amount can't change.
So if extra snow sticks to it as it merrily rolls along, and its mass
increases, then it must slow down.
Answer:
False
Explanation:
The magnitude of electric charge carried by an electron as well as proton is called elementary charge. Both the electron and proton have the same charge but the difference is that the electrons are negatively charged species and the protons are positively charged.
The elementary charge is equal to . Hence, the given statement "The elementary charge equals " is false.
There are three ways an object can accelerate: a change in velocity, a change in direction, or a change in both velocity and direction.
Answer:
its direction is changing
Answer:
The second option - same change in momentum, different force
Explanation:
They experience the same change in momentum, but the force on car A is greater.
p=m*v
Impulse, or change in p=F*t
We know the cars have the same change in momentum, because they both go from the same initial momentum (p=mv), to zero momentum. Therefore, both experience the same change in momentum. Since the time is different, but the change in momentum is the same, the force has to be different.
For example: if both cars had 200 kg*m/s of momentum at the start, and 0 at rest, the impulse is 200 kg*m/s
So,
p(a)= 200=F(0.3)
p(b)= 200=F(5)
Which force has to be greater to make the equations true? The force for Car A, of course!