133. If a potential difference of 10 V is maintained across a 1.0-m length of the Nichrome wire with resistance 4.6 ω, what is the current in the wire?

• 2.2 A

134. An electric heater is constructed by applying a potential difference of 120 V to a Nichrome wire that has a total resistance of 8.00 Ω. Find the current carried by the wire.

• 15 A

135. An electric heater is constructed by applying a potential difference of 120 V to a Nichrome wire that has a total resistance of 8.00 Ω. Find the power rating of the heater.

• 1.8 kW

136. A battery has an emf of 12.0 V and an internal resistance of 0.05 Ω. Its terminals are connected to a load resistance of 3.00 Ω. Find the terminal voltage of the battery.

• 11.8 V

137. Calculate the power delivered to the load resistor, if the current in the circuit is 3.93 A, the load resistance is 3.00 Ω.

• 46.3 W

138. Calculate the power delivered to the internal resistance of the battery, if the current in the circuit is 3.93 A, the internal resistance of 0.05 Ω.

• 0.772 W

139. Four resistors are connected as shown in Figure. Find the equivalent resistance between points a and b.

• 12 Ω

140. Four resistors are connected as shown in Figure. Find the equivalent resistance between points b and c.

• 2 Ω

141. Four resistors are connected as shown in Figure. Find the equivalent resistance between points a and c.

• 14 Ω

142. Three resistors are connected in parallel as shown in Figure. A potential difference of 18.0 V is maintained between points a and b. Find the current I₁.

• I₁=6.00 A

143. Three resistors are connected in parallel as shown in Figure. A potential difference of 18.0 V is maintained between points a andb. Find the current I₂.

• I₁=3.00 A

144. Three resistors are connected in parallel as shown in Figure. A potential difference of 18.0 V is maintained between points a and b. Find the current I₃.

• I₁=2.00 A

145. Three resistors are connected in parallel as shown in Figure. A potential difference of 18.0 V is maintained between points a and b. Calculate the power delivered to resistor R₁.

• P₁=108 W

146. Three resistors are connected in parallel as shown in Figure. A potential difference of 18.0 V is maintained between points a and b. Calculate the equivalent resistance of the circuit.

• R_eq=1.64 Ω

147. A single-loop circuit contains two resistors and two batteries, as shown in Figure. (Neglect the internal resistances of the batteries.) Find the current in the circuit.

• I=-0.33 A

148. A segment of steel railroad track has a length of 30.000 m when the temperature is 0.0°C. What is its length when the temperature is 40.0°C? (Average linear expansion coefficient for steel is α=11* 10^-6 °C^-1).

• 30.013 m.

149. An ideal gas occupies a volume of 100 cm³ at 20°C and 100 Pa. Find the number of moles of gas in the container (Universal gas constant R= 8.314 J/mol*K).

• 4.11 * 10^-6 mol

150. The concrete sections of a certain superhighway are designed to have a length of 25.0 m. The sections are poured and cured at 10.0°C. What minimum spacing should the engineer leave between the sections to eliminate buckling if the concrete is to reach a temperature of 50.0°C? (Average linear expansion coefficient for concrete is α=12* 10^-6 °C^-1).

• 1.20 cm

151. Just 9.00 g of water is placed in a 2.00-L pressure cooker and heated to 500°C. What is the pressure inside the container? (Molar mass of water M(H₂O) = 18 g/mol, universal gas constant R= 8.314 J/mol*K ).

• 1.61 MPa

152. The temperature of a silver bar rises by 10.0°C when it absorbs 1.23 J of energy by heat. The mass of the bar is 525 g. Determine the specific heat of silver.

• 234 J/kg ^. °C

153. A 50.0-g sample of copper is at 25.0°C. If 1 200 J of energy is added to it by heat, what is the final temperature of the copper? (Specific heat of copper c= 387 J/kg ^. °C).

• 87°C

154. Determine the work done on a fluid that expands from i to f as indicated in Figure.

• -12 MJ

155. A gas is taken through the cyclic process described in Figure. Find the net energy transferred to the system by heat during one complete cycle.

• 12 kJ

An ideal gas initially at 300 K undergoes an isobaric expansion at 2.50 kPa. If the volume increases from 1.00 m³ to and 12.5 kJ is transferred to the gas by heat, what is the change in its internal energy?

• 7.5 kJ

157. A glass window pane has an area of 3.00 m² and a thickness of 0.600 cm. If the temperature difference between its faces is 25.0°C, what is the rate of energy transfer by conduction through the window? (Thermal conductivity of glass k= 0.8 W/m* °C)

• 10 kW

158. A cylinder contains a mixture of helium and argon gas in equilibrium at 150°C. What is the average kinetic energy for each type of gas molecule? (Boltzmann constant k_B= 1.38* 10^-23 J/K).

• 8.76* 10^-21J

159. Calculate the change in internal energy of 3.00 mol of helium gas when its temperature is increased by 2.00 K (Universal gas constant R= 8.314 J/mol*K ).

• 74.8 J

160. A 2.00-mol sample of a diatomic ideal gas expands slowly and adiabatically from a pressure of 5.00 atm and a volume of 12.0 L to a final volume of 30.0 L. What is the final pressure of the gas?

• 1.39 atm

161. A 2.00-mol sample of a diatomic ideal gas expands slowly and adiabatically from a pressure of 5.00 atm and a volume of 12.0 L to a final volume of 30.0 L. What are the initial and final temperatures? (Universal gas constant R= 8.314 J/mol*K, 1 atm= 1.013* 10⁵ Pa )

• 365 K, 253 K

162. A 2.00-mol sample of a diatomic ideal gas expands slowly and adiabatically from a pressure of 5.00 atm and a volume of 12.0 L to a final volume of 30.0 L. Find Q, ΔE_int, and W (Universal gas constant R= 8.314 J/mol*K).

• 0 J, -4.66 kJ, - 4.66 kJ

163. A heat engine takes in 360 J of energy from a hot reservoir and performs 25.0 J of work in each cycle. Find the efficiency of the engine.

• 6.94 %

164. A heat engine performs 200 J of work in each cycle and has an efficiency of 30.0%. For each cycle, how much energy is (a) taken in and (b) expelled by heat?

• 667 J, 467 J

165. A particular heat engine has a useful power output of 5.00 kW and an efficiency of 25.0%. The engine expels 8 000 J of exhaust energy in each cycle. Find the energy taken in during each cycle

• 10.7 kJ

166. The unit for permeability is

• Wb/At × m

167. What is the magnetomotive force in a 75-turn coil of wire when there are 4 A of current through it?

• 300 At

168. The direction of a magnetic field within a magnet is

• from south to north

169. When the north poles of two bar magnets are brought close together, there will be

• a force of repulsion

170. The ability of a material to remain magnetized after removal of the magnetizing force is known as

• retentivity

171. The voltage induced across a certain coil is 200 mV. A 120 resistor is connected to the coil terminals. The induced current is

• 1.7 mA

172. The induced voltage across a stationary conductor in a stationary magnetic field is

• zero

173. When a solenoid is activated, the force that moves the plunger is

• an electromagnetic field

174. What is the magnetomotive force (mmf) of a wire with 8 turns carrying three amperes of current?

• 24 At