Concept explainers
In Problems 75 through 77 you are given the equation(s) used to solve
a problem. For each of these, you are to
a. Write a realistic problem for which this is the correct equation(s).
b. Finish the solution of the problem.
75.
76.
77.
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Physics For Scientists and Engineers
- During a lightning flash, there exists a potential difference of Vcloud - Vground = 1.2 x 109 V between a cloud and the ground. As a result, a charge of -25 C is transferred from the ground to the cloud. (a) How much work is done on the charge by the electric force? (b) If the work done by the electric force were used to accelerate a 1100-kg automobile from rest, what would be its final speed? (c) If the work done by the electric force were converted into heat, how many kilograms of water at 0 ˚C could be heated to 100 ˚C?arrow_forwardDuring a lightning flash, there exists a potential difference of Vcloud - Vground = 2.4 x 109 V between a cloud and the ground. As a result, a charge of -25 C is transferred from the ground to the cloud. (a) How much work Wground–cloud is done on the charge by the electric force? (b) If the work done by the electric force were used to accelerate a 1100-kg automobile from rest, what would be its final speed? (c) If the work done by the electric force were converted into heat, how many kilograms of water at 0 °C could be heated to 100 °C?arrow_forward(a) (1 point) Did the electron’s kinetic energy increase or decrease?(b) (1 point) Did the electron’s electric potential energy increase or decrease?(c) (3 points) What is the magnitude of the change in the electron’s electric potential energy?arrow_forward
- Can a contour map help you visualize the electric potential energy? Explain.arrow_forwardThe electric potential is given by V = 4x2z + 2xy2 8yz2 in a region of space, with x, y, and z in meters and V in volts. a. What are the x, y, and z components of the electric field in this region? b. What is the magnitude of the electric field at the coordinates (2.00 m, 2.00 m, 1.00 m)?arrow_forwardDuring a lightning flash, there exists a potential difference of Vcloud - Vground = 1.8 x 109 V between a cloud and the ground. As a result, a charge of -20 C is transferred from the ground to the cloud. (a) How much work Wground–cloud is done on the charge by the electric force? (b) If the work done by the electric force were used to accelerate a 1100-kg automobile from rest, what would be its final speed? (c) If the work done by the electric force were converted into heat, how many kilograms of water at 0 °C could be heated to 100 °C? Wground–cloud =arrow_forward
- An electron has an initial velocity of 8 x 105 m/s. a) What potential difference is required to stop the electron? b) Is the final potential higher or lower than the initial? c) Draw the electron and its direction of initial velocity.arrow_forwardA stationary proton is moved form point A, where the potential is 450.0 V, to point B, where the potential is 125.0 V. (a) How much work is done be the electric force? (b) What is its speed to point B ? (c) What is the electric potential energy of point A? (D) What is the electric potential energy at Point B?arrow_forwardWhat is the value of R3? R1 = 14.0 Ω, R2 = 10.0 Ω, ΔV = 9.00 V and I = 308 mA. 5.83 Ω 23.4 Ω 5.22 Ω 29.2 Ωarrow_forward
- Q8. Calculate the divergence and Curl, of the following functions a. V= x2 i+3xy2 j -2xyz kb. V=xyi+2yz j+3zx kc. V= y2i +(2xy+z2)j+ 2yz k , where i , j , k are unit vectors along x, y and z axisarrow_forwardA proton moves from a location where V = 75 V to a spot where V = 220 V. (a) What is the change in the proton’s kinetic energy? (b) If we replace the proton with an electron, what is the change in kinetic energy?arrow_forwardAt home I have a 350W motorized washing machine that I use to wash three times a week, 2 batches of clothes of 22 minutes each each time. Based on this problem, answer the following questions: a) How much energy in Joules do I "consume" in a year? (use 52 weeks for your calculation) b) based on the conditions of the previous question, what consumption would you have in kWh? c) How much do I pay, annually, in dollars, for the use of the washing machine, if the rate for energy from my electric company is 0.17443 / kWh?arrow_forward
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage LearningPrinciples of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning