a) 14.4 m/s
The problem can be solved by using the law of conservation of total momentum; in fact, the total initial momentum must be equal to the final total momentum:
So we have:
(1)
where
is the mass of each ball
is the initial velocity of the green ball
is the initial velocity of the blue ball
is the final velocity of the green ball
is the final velocity of the blue ball
Simplifying the mass in the equation and solving for , we find
b) 12.0 m/s
This time, the green ball continues moving after the collision at
So the equation (1) becomes
And solving for we find
c) 13.5 m/s
This time, the green ball continues moving after the collision at
So the equation (1) becomes
And solving for we find
Answer:
A) Distance
Explanation:
The shortest distance that is represented as the measurement from one point to another is called distance.
It should not be confused with displacement as it represents the sum of the distances travelled by a body or person.
Answer: Option B) False
Explanation:
Current is the movement of negative charges called electrons. Protons, neutrons and electrons are the three subatomic particles that make up particles of the conductors that transmit current, however electrons are negatively charged and their gain or loss determines movement of electric current.
Thus, the statement is false
Answer:
The entropy change is 45.2 kJ/K.
Explanation:
mass of water at 100 C = 2 kg
Latent heat of vaporization, L = 2260 kJ/kg
Heat is
H = m L
H = 2 x 2260 = 4520 kJ
Entropy is given by
S = H/T = 4520/100 = 45.2 kJ/K
