Two balls are placed near one another and hang down, as shown below.

2 overlapping circles. The left circle is labeled Conduction. The right circle is labeled Induction. An X is in the nonoverlapping part of the left circle.
Which conclusion is supported by this evidence?

Neither ball has a charge.
The balls are both positively charged.
One ball is positively charged, and the other is negatively charged.
Each ball has a charge, but the type of charge is unknown.

(2) (a) you have a simple circuit that consists of only a battery (δvbat=1.5v) and two resistors with resistance r1=10ω and r2=5ω, connected in series with each other. what is the current running through the battery? (b) you re-arrange your circuit so now r2 is attached in parallel to r1 rather than in series. what is the current running through the battery? (c) you add an additional resistor r3=7ω on the same branch as r2. what is the current running through the battery? (d) what is the power dissipated in r3?

6–48 bananas are to be cooled from 24 to 138c at a rate of 215 kg/h by a refrigeration system. the power input to the refrigerator is 1.4 kw. determine the rate of cooling, in kj/ min, and the cop of the refrigerator. the specific heat of banana above freezing is 3.35 kj/kg·8c.

Which best describes the difference between internal and thermal energy?