Answer:
Explanation:
The linear momentum during this collision must be conserved, which means that momentum before and after the collision must be the same.
We have a big defensive lineman of mass and velocity going in what we will call the positive direction, and a wide receiver of mass and velocity which we don't know. Since the collision is head on, momentum before the collision will be
After the collision, the receiver drops the lineman in his tracks, which means they come to a stop, so the momentum is null, and since this momentum must be equal to the one before the collision we have:
Which means:
So for we have:
where the negative sign indicates its opposite to our positive direction (of the big defensive lineman).
Answer:
3g/mL
Explanation:
The density of a substance can be calculated using the formula;
Density = mass/volume
Where;
Density = g/mL
mass = grams (g)
volume = (mL)
According to this question, 45.0g of a sample placed in a graduated cylinder causes the water level to rise from
25.0mL to 40.0mL. This means that the volume of the sample is 40mL - 25mL = 15mL
Using D = m/v
D = 45/15
D = 3g/mL
Hence, the density of the sample is 3g/mL
Answer:
Metals
Explanation:
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The Answer is B. The Motion of the butter molecules remains the same
Answer:
the kinetic energy lost due to friction is 22.5 J
Explanation:
Given;
mass of the block, m = 0.2 kg
initial velocity of the block, u = 25 m/s
final velocity of the block, v = 20 m/s
The kinetic energy lost due to friction is calculated as;
Therefore, the kinetic energy lost due to friction is 22.5 J