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27 Nov 2019

A 12.5-foot-long, nearsighted python is stretched out perpendicular to a plane mirror, admiring its reflected image. If the greatest distance to which the snake can see clearly is 26.0 ft., how close must its head be to the mirror for it to see a clear image of its tail?

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Nelly Stracke
Nelly StrackeLv2
15 Aug 2019
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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

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1)As shown in the figure, a uniform conducting rod of length 0.40 m and mass 0.075 kg is in rotational equilibrium about the hinge at point O. A uniform magnetic field of 0.23 T is directed out of the plane of the page, perpendicular to the rod. Due to a battery and wires not shown, there is a current of 4.0 A in the rod directed toward point O. Determine the angle θ.

Image for As shown in the figure, a uniform conducting rod of length 0.36 m and mass 0.075 kg is in rotational equilibri

2)As shown in the figure, a conducting rod with a length of 0.79 m is placed on a horizontal frictionless surface and attached to a power supply by two springs, each with a spring constant of 81 N/m. The springs are initially at their equilibrium length and are in a region where there is a uniform magnetic field of 0.17 T that is perpendicular to the frictionless surface when the power supply supplies a current that causes the wire to move in such a direction that the two springs are stretched.

A top view of a table shows an arrow field labeled vector B pointing down into the table. On the table a rod lies from the top of the image to the bottom of the image, with a spring attached to the right side of the rod near the top and bottom. The springs are connected to wires that are attached to a power supply.
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3)A conducting rod of length L = 30.5 cm slides over two horizontal metal bars with a constant speed v to the left through a distance Δx in a time Δt. The entire set up is in a region of uniform magnetic field of magnitude 1.30 T that is directed perpendicular to the rods and out ofthe page.
(a) If the induced emf has a magnitude of 1.00 V, what is the speed with which the rod moves?
 
4)An MRI technician moves his hand from a region of very low magnetic field strength into an MRI scanner's 2.00-T field with his fingers pointing in the direction of the field.
(a) Find the average emf induced in his wedding ring, given its diameter is 2.34 cm and assuming it takes 0.222 s to move it into the field.


(b) If the resistance of the ring is 1.00 mΩ, how much heat will be transferred to the ring during this time?

A single coil with a radius of 0.02 m is placed inside a 3m longsolenoid that has 600
turns. The radius of the solenoid is 0.15 m. The plane of the coilis perpendicular to the axis of the solenoid. The solenoid isconnected to a battery, an ammeter and a switch. The ammeterreaches 5A in 0.2 seconds and remains constant. The change in themagnetic flux across the small loop is 1.58 x 10^-6 T.m^2. Theaverage induced emf (voltage) in the small loop is 7.9 x 10^-6 V.Another solenoid has an inductance of 8.000 henries and aresistance of 2.772O. It is connected to a battery and a switch.How long does it take for the current to reach half of its maximumvalue after the switch is closed?

I cannot figure out which equation to used in order to solve this.I know the current must be determined, but I am not sure how to dothat with knowing only the inductance and the resistance. I knowI'm probably over-thinking this, but everything I've tried does notgive the correct answer. Can someone please help me figure thisout?

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