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136. Mr. Jenkins constructed a circuit consisting of a variable source, wires, and a resistor. In order to triple the amount of current, how should he change the voltage of the source?
137. One 7.0 kg bowling ball is lifted to a storage shelf 1.0 m above the fl oor. A second 7.0 kg ball is lifted to a storage shelf 2.0 m above the fl oor. Which of the following best explains why the measured force of gravity on each ball is nearly identical?
138. The water contained in a geyser system gains energy from the underground material surrounding it. The water molecules gain kinetic energy and this results in an increase in the pressure of the water. Eventually the geyser erupts and expels water into the air above ground. Which of the following types of energy is the source for the initial energy gain of the water?
139. Visible light passes through glass. Other types of electromagnetic radiation are able to pass through other materials in a similar way. Which of the following are used in medical technology because they can pass through some parts of the human body?
140. A negatively charged rubber rod was brought near some small pieces of paper. The rod’s charges repelled the negative charges in the pieces.Which of the following caused the repulsion of the negative charges?
