Answer:
chemical energy to electrical energy to sound energy to heat energy
B. They came up with the term “radioactivity.”
C. They conducted experiments with uranium-containing minerals and pure uranium.
E. They discovered two new radioactive elements
Answer:
1960 J
Explanation:
Potential energy is given as the product of mass, height and acceleration due to gravity and expressed as mgh where m represent the mass of the swimmer, g is acceleration due to gravity and h is the height. Since the swimmer has just gone 4 m from the surface, that is the height that potential energy is converted to kinetic energy. This follows the law of transformation of energy since the energy can't be lost but rather transformed from one state to another. Therefore, substituting 50 kg for m, 4 m for h and 9.8 for g we obtain that PE=50*4*9.8=1960 J. Since it's not among the options here, maybe it is option D
The change in the internal energy of the system will increase.
The given parameters;
- <em>work on the system, w = 150 J</em>
- <em>heat added to the system, Q = 270 J</em>
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The change in the internal energy of the system is calculated by applying first law of thermodynamics as follows;
ΔU = Q + w
where;
- <em>ΔU is the change in the internal energy</em>
ΔU = 150 J + 270 J
ΔU = 420 J
Thus, the change in the internal energy of the system increases.
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