2.A student in lab is monitoring a current flowing through a uniform wire and notices the wire gettinghotter. The instructor tells the student to write an explanation as to why the wire was getting hotter.The student wrote that the electrons stopped moving and transformed all of their kinetic energy intothermal energy into the wire. Is this statement...B. FalseA. True2.

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Answered: 2. A student in lab is monitoring a…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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A rod of length 2.3 m, with a rectangular cross section (1.5mm x 3.0 mm) is made ofa material with a resistivity of 6.1 × 10^-8 Ohm. A potential difference of 5.0 V isplaces across the ends of the rod.a. Draw a clear physics diagram of the problem.b. At what initial rate is heat generated in the rod?c. Will the rate from part (b) increase, decrease, or remain constantover time, as the rod remains connected to the 2.5 V potential difference?Explain briefly
atus xam Which material would get electrons from the source to the load the. FASTEST? A. gold B. glass C. plastic Oppyright ag- As Corporaton All gh eerved 19°F Mos FR F10 PrISC 10 7
1.For copper, α = 3.9×10−3 ∘C−1. Suppose 2.5-m-long, 0.40-mm-diameter copper wire is connected across the terminals of a 1.5 V ideal battery. What is the current in the wire at 20∘C? 2.What is the rate, in A/∘C, at which the current changes with temperature as the wire heats up?
5. A 250-volt electrical heater is used to warm 3Li/hr of water from 19°C to 98°C. Assume heat conversion loss of 25% of the total heat supplied, how much current in amperes must be supplied to this heater. Derive with the formula below, show the cancellation, explain the step by step and DRAW a free body diagram/figure. refer with this: PE1 + KE1 + U1 + WF1 + Q1 + W1 = PE2 + KE2 + U2 + WF2 + Q2 + W2 + E losses.
p versus T. The figure shows the behavior of the resistivity p of a material Z as a function of temperature T. If a constant electric field is maintained inside it, which of the following statements is/are TRUE P. about the metal? I. The current density in metal Z increases with increasing tempera- -T To ture. II. Its resistivity at T = T, is Po. III. Metal Z becomes a better conductor with increasing temperature. A. I only В. П only C. I and II D. II and III
6. High energy proton beams can be used to kill cancer cells. The beam consists of protons with 2.5x10-" J and a current of 75 nA. Assume all the protons stop in the tumor. A total of 3.4x10-3 J is needed to treat the tumor. A. How fast are the protons moving? B. What is the energy of each proton and the total energy needed in eV? C. How many protons reach the tumor each second? D. How long should the beam run to deliver the required amount of energy to the tumor?
1. Silver is composed of 5.8 x 1028 free electrons per cubic meter. If a silver wire with a diameter of 1.8 mm can allow charges of 360 C to flow in 1 hour,a. What is the current in the conducting wire?b. What is the magnitude of the drift velocity of the electrons in the conducting wire?
2. A cylindrical copper cable 1.50 km long is connected across a 220-V potential difference. The resistivity of copper at room temperature (-293 K) is 1.72 x 10¹ m. a. What should be its diameter so that it produces heat (.e. dissipates electrical energy) at a rate of 90.0 W? b. What is the electric field inside the cable under these conditions? c. What is the current flowing through the copper cable? d. If the temperature of the copper cable increases by 10 degrees, what is the new resistivity of the copper cable and what is the new rate at which it produces heat? Neglect the effect of changes in the cable's dimensions.
V4
1. A charge of 12 C passes through the filament of a car headlamp bulb in 4 s. What is the current?2. A current of 0,5 A flows for 20 s through a small electric motor. How much charge has passed?3. A current of 200 mA flows for 2 minutes. How much charge has passed?
Choose the CORRECT answer for each item. 1.There are two wires, one is made of copper and the other one is silver. These two wires of the same length are made, one from each of the materials. Is it possible for each wire to have the same resistance? Yes, because the two wires have the same length. Yes, because copper and silver have the different resistivity. No, because the two wires have the same length. No, because copper and silver have the different resistivity. a. b. C. d. 2.A flashlight requires two 1.5-volt batteries for it to light. The current that flows through it is equivalent to 0.15 A. In an hour of operation, how much charge flows in the system? a. 520 C b. 540 C c. 560 C d. 580 C 3.A hair blower contains a heating element which has a resistance of 57 Q. This heating element is energized by a 220-V outlet. What is the current that flows in the heating element? a. 3.9 A b. 4.9 A c. 5.9 A d. 6.9 A
Solve the following: 1. How many nanocoulomb are there in 3.65 billion electrons ? 2. A 25 ampere electric current flows in a conductor in 75 millisecond. Find: a. current equivalent in mA? b. How many charges are transferred ? c. How much work is required to transfer if 3V is applied. 3. A charge of 3.5 µC present in an electric field produces a force of 0.008 Newton. What is the intensity of the electric field ? 4. A charge of 0.6 µC is placed in an electrostatic field whose intensity is 3 x 105 N/C. How strong is the force acting on the charge ? 5. Two objects are both negatively charge with 0.04 coulomb each and 140 cm apart. What kind of force exist Between charges? How much? 6. Find the force that exist between two charges of 8.53 μC and 4.5 µC that 0.25 meters in air?

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