8. Integrated Concepts. A 12.0 V battery-operated bottle warmer heats 50.0 g of glass, 2.50 x 102 g of baby formula, and 2.00 x 102 g of aluminum from 20.0°C to 90.0°C. (a) How much charge is moved by the battery? (b) How many electrons per second flow if it takes 5.00 min to warm the formula? (Hint: Assume that the specific heat of baby formula is about the same as the specific heat of water.)

8. Integrated Concepts. A 12.0 V battery-operated bottle warmer heats 50.0 g of glass, 2.50 x 102 g of baby formula, and 2.00 x 102 g of aluminum from 20.0°C to 90.0°C. (a) How much charge is moved by the battery? (b) How many electrons per second flow if it takes 5.00 min to warm the formula? (Hint: Assume that the specific heat of baby formula is about the same as the specific heat of water.)

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter5: Electric Charges And Fields

Section: Chapter Questions

Problem 42P: A 2.5-g copper penny is given a charge of 4.0109C . (a) How many electrons ale removed from the...

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(a) Calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 10.0 g. Silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) Imagine adding electrons to the pin until the negative charge has the very large value 1.00 mC. How many electrons are added for every 109 electrons already present?
Why do we need to be careful about work done on the system versus work done by the system in calculations?
A 2.5-g copper penny is given a charge of 4.0109C . (a) How many electrons ale removed from the penny? (b) If no more than one electron is removed from an atom, what percent of the atoms are ionized by this charging process?
5. A plastic rod is rubbed with wool, producing a distribution of positive and negative surplus charge that is concentrated in two locations on the rod and two on the wool. This distribu- tion can be approximated as two pairs of small balls of charge as shown in Figure P26.5. The distance d is 30.0 mm, and the magnitude of the charge on each ball is 2.00 µC. If 34.0 J of work went into thermal energy as the rod and wool heated up, how much work was done on the system? Figure P26.5 2d- 2d- rod wool -
A 12.0 V battery-operated bottle warmer heats 50.0 g of glass, 2.50×102 g of baby formula, and 2.00×102 g of aluminum from 20.0ºC to 90.0ºC . (a) How much charge is moved by the battery? (b) How many electrons per second flow if it takes 5.00 min to warm the formula? (Hint: Assume that the specific heat of baby formula is about the same as the specific heat of water.)
A 12.0-V battery-operated bottle warmer heats 50.0 g of glass, 2.50 × 102 g of baby formula, and 2.00 × 102 g of aluminum from 20.0 °C to 90.0 °C . (a)How much charge is moved by the battery? (b) How many electrons per second flow if it takes 5.00 min to warm the formula? (Hint: Assume that the specific heat of baby formula is about the same as the specific heat of water.)
4. It takes 12 Joules to transfer 4 Coulombs of charge from point A to point B. Between A and B is a half feet long resistive cylindrical material whose resistivity is 10 ohm-CM/ft and diameter is 0.01 inches. Determine a. the number of electrons being transferred in a span of 10 seconds b. the power dissipated by the resistive material
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7. The resistivity of seawater is p= 25 2.cm and the number of charges per volume is 6 × 1020 ions/ cm3 each with charge q 1.6 x 10-19 C. If we fill a tube 2 m long with seawater and connect a 12-volt battery, what is the resulting average drift velocity of the ions (Answer in cm/s)?
5. An electric field is given as E = -10e (sin2zāx + xsin2zāy + 2xcos2zā,)V/m a. Find Ē at P(5,0,). b. How much work is done in moving a charge of 2nC an incremental distance of 1 mm from P in the direction of å,? äy? ā,? d, + đy + ả¸?
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