The speed of an object is increasing. This means O a. The acceleration of the object is zero O b. The velocity and acceleration of the object are in the same direction Oc. The velocity and acceleration of the object are in opposite directions O d. The velocity and acceleration of the object are perpendicular

The speed of an object is increasing. This means O a. The acceleration of the object is zero O b. The velocity and acceleration of the object are in the same direction Oc. The velocity and acceleration of the object are in opposite directions O d. The velocity and acceleration of the object are perpendicular

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter9: Current And Resistance

Section: Chapter Questions

Problem 83CP: A particle accelerator produces a beam with a radius of 1.25 mm with a current of 2.00 mA. Each...

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The human body can exhibit a wide range of resistances to current depending on the path of the current, contact area, and sweatiness of the skin. Suppose the resistance across the chest from the left hand to the right hand is 1.0 106 . (a) How much voltage is required to cause possible heart fibrillation in a man, which corresponds to 500 mA of direct current? (b) Why should rubber-soled shoes and rubber gloves be worn when working around electricity?
. The generator at a large power plant has an output of 1,000,000 kW at 24,000 V. (a) If it were a DC generator, what would he the current in it? (b) What is its energy output each day—in joules and in kilowatt—hours? (c) If this energy is sold at a price of 10 cents per kilowatt-hour, how much revenue does the power plant generate each day?
Integrated Concepts (a) What energy is dissipated by a lightning bolt having a 20,000-A current, a voltage of 1.00102 MV, and a length of 1.00 ms? (b) What mass of tree sap could be raised from 18.0°C to its boiling point and then evaporated by this energy, assuming sap has the same thermal characteristics as water?
Four long, parallel conductors carry equal currents of I = 4.00 A. The figure below is an end view of the conductors. The current direction is into the page at points A and B and out of the page at C and D. Already calculated B= 16 uT . But there is another question I dont know how to answer: What If? What would be the magnitude and direction of the initial acceleration of an electron moving with velocity 3.18 ✕ 105 m/s into the page at point P?ays: (magnitude and direction)
A portable CD player uses a current of 7.5 mA at a potential difference of 3.5 V. (a) How much energy does the player use in 35 s?(b) Suppose the player has a mass of 0.65 kg. For what lengthof time could the player operate on the energy required to lift itthrough a height of 1.0 m?
The speed of propagation of the action potential (anelectrical signal) in a nerve cell depends (inversely) on thediameter of the axon (nerve fiber). If the nerve cell connectingthe spinal cord to your feet is 1.1 m long, and the nerveimpulse speed is 18 m/s, how long does it take for the nervesignal to travel this distance?
) A metal rod of length L has a resistance of 15 Ω when the current flows in the direction of L. 4The metal rod is cut into three equal lengths that are then stacked on top of each other to forma new rod with length L/3. What is the resistance of this new rod, when the current flows alongthe L/3 length?
A large cyclotron directs a beam of He++nuclei onto a target with a beam current of 0.250 mA. (a) How many He++ nuclei per second is this? (b) How long does it take for 1.00 C to strike the target? (c) How long before 1.00 mol of He++ nuclei strike the target?
A particle accelerator produces a beam with a radius of 1.25 mm with a current of 2.00 mA. Each proton has a kinetic energy of 10.00 MeV. (a) What is the velocity of the protons? (b) What is the number (n) of protons per unit volume? (b) How many electrons pass a cross sectional area each second?
The human body can exhibit a wide range of resistances to current depending on the path of the current, contact area, and sweatiness of the skin. Suppose the resistance across the chest from the left hand to the right hand is 1.0 106 . (a) How much voltage is required to cause possible heart fibrillation in a man, which corresponds to 500 mA of direct current? (b) Why should rubber-soled shoes and rubber gloves be worn when working around electricity?
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