PLEASE HELP!!!!! which statements correctly conpare the masses of protons,neutrons,and electrons
1 answer:
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The brightness of the lamp is proportional to the current flowing through the lamp: the larger the current, the brighter the lamp.
The current flowing through the lamp is given by Ohm's law:
where
V is the potential difference across the lamp, which is equal to the emf of the battery, and R is the resistance of the lamp.
The problem says that the battery is replaced with one with lower emf. Looking at the formula, this means that V decreases: if we want to keep the same brightness, we need to keep I constant, therefore we need to decrease R, the resistance of the lamp.
Answer:
17.72° or 72.28°
Explanation:
u = 6.5 m/s
R = 2.5 m
Let the angle of projection is θ.
Use the formula for the horizontal range
Sin 2θ = 0.58
2θ = 35.5°
θ = 17.72°
As we know that the range is same for the two angles which are complementary to each other.
So, the other angle is 90° - 17.72° = 72.28°
Thus, the two angles of projection are 17.72° or 72.28°.
This question involves the concept of kinetic energy.
The student's claim is "right".
<h3>Kinetic Energy</h3>The energy possessed by a body, by the virtue of its motion is called kinetic energy. Mathematically it is given by the following formula:
where,
- K.E = Kinetic energy
- m = mass
- v = velocity
Therefore,
For the paintball:
K.E = 16200 J
For the pellet:
K.E = 16200 J
Hence, both paintball and pellet will have same kinetic energy. The student is right.
Learn more about kinetic energy here:
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