Answer:
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Explanation:
Answer:
A. Potential energy decreases and kinetic energy increases, but the total amount of mechanical energy remains the same.
Explanation:
Potential energy is the latent energy in an object at rest. Kinetic energy, is the energy expressed by an object in motion.
The ball is starting at rest and that is where the potential energy is at. In that case, the ball has no kinetic energy (no movement). When the ball begins to move that kinetic energy starts to increase and the potential energy decreases because it is no longer at rest.
Explanation:
Every atom has no overall charge (neutral). This is because they contain equal numbers of positive protons and negative electrons. These opposite charges cancel each other out making the atom neutral.
Answer:
44.1 m
Explanation:
<u>Given:</u>
- = speed of sound in air = 343 m/s
- = speed of sound in the rod =
- = times interval between the hearing the sound twice = 0.12 s
<u>Assumptions:</u>
- = length of the rod
- = time taken by the sound to travel through the rod
- = time taken by the sound to travel to through air to the same point =
We know that the distance traveled by the sound in a particular medium is equal to the product of the speed of sound in that medium and the time taken.
For traveling sound through the rod, we have
..........eqn(1)
For traveling sound through the air to the women ear for traveling the same distance, we have
Hence, the length of the rod is 44.1 m.
(15.9 - 15.6) / 15.9 × 100% (because the actual weight is 15.9)
1.8868% = 1.89%
Answer: D
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