What are forces felt by an ion in an electric field, an electron in a wire carrying current, and a magnet (and its component parts) in a magnetic field and why are these forces important.

A cylindrical glass beaker of height 1.272 m rests on a table. The bottom half of the beaker is filled with a gas, and the top half is filled with liquid mercury that is exposed to the atmosphere. The gas and mercury do not mix because they are separated by a frictionless, movable piston of negligible mass and thickness. The initial temperature is 276 K. The temperature is increased until a value is reached when one-half of the mercury has spilled out. Ignore the thermal expansion of the glass and mercury, and find this temperature in kelvins.

For those fortunate souls who do not need glasses, the lens of the eye adjusts its focal length in order to form a proper image on the retina. This typically means that very distant objects as well as objects as close as 25 cm can be seen clearly. Many of us need corrective lenses since the lens in our eye cannot adjust sufficiently to produce a clear image over the full range object distances. This may be because the lens itself does not adjust well or because the eye is either longer or shorter than ‘normal’. In the case of someone who is nearsighted (can see up close) the eye may only be able to see clearly items up to 50cm or 1m away (this would be the far point). In order to see something further away, a lens (either glasses or contacts) is used to produce a virtual image of a distant object at the person’s far point. Their eye can then accommodate the rest of the way and produce a clear image. Suppose a person who has a far point of 63.0 cm is trying to view a distant object. What is the focal length (with correct sign) of a lens that would take a distant object and make an image on the same side of the lens as the object a distance 63.0 cm from the lens? Incorrect.

Is the lens converging or diverging?

Lenses are prescribed in terms of their refractive power, which is expressed in terms of diopters (see the text or your favorite search engine for the definition of a diopter). What is the refractive power of this lens in terms of diopters? (do not enter units.)

In the case of someone who is farsighted, the eye is not able to focus clearly on objects closer than a certain distance. This closest point on which a person’s eye can focus is called the near point. In this situation the corrective lens is used to make an object closer than the near point produce an image further away from the lens at the near point. Suppose a person who has a near point of 53.1 cm is trying to view a book at a distance of 25.0 cm. What is the focal length (with correct sign) of a lens that would take the book and make an image on the same side of the lens as the book a distance 53.1 cm from the lens?

Is the lens converging or diverging?

What is the refractive power of this lens in terms of diopters? (do not enter units.)

A -3.00 nC point charge is at the origin, and a second -5.50 nC point charge is on the x-axis at x = 0.800 m.

Q1: Find the net electric force that the two charges would exert on an electron placed at point on the x-axis at x = 1.20 mm.

Q2: Find the net electric force that the two charges would exert on an electron placed at point on the x-axis at x = -0.200 m

You are 50m away from a train and running at a constant velocity of 26m/s. The train has a constant acceleration of 39m/s2. If it takes the train 4.92 seconds to reach a distance of 150m, and it takes you 5.78 seconds to reach a distance of 150m, then at what distance will the two meet? Please show what equations to use, THEN input the values. Thanks!

Please let me know if there are any missing variables you need. I'm trying to do a lab experiment and I don't know what equations to use--also I know that the measurements are unrealistic, I'm just giving you the variables from my experiment.

Given: 2 balls collide

m1= 0.126 kg          m2=0.126 kg

Before collision:

Yx(initial)= 4.00 m/s         V2x(initial)= -2.00 m/s

Yy(initial)= 1.50 m/s          V2y(initial)= 2.00 m/s

After collision:

V1x(final)= -0.482 m/s            V2x(final)= 2.482 m/s

V1y(final)= 2.020 m/s             V2y(final)= 1.480 m/s

Calculate the x and y components of the total momentum of the system before the collision.

Calculate the x and y components of the total momentum of the system after the collision.

Is the momentum conserved? Explain.

Calculate the total momentum of the system before the collision.

Calculate the total momentum of the system after the collision.

Is the collision elastic, partially elastic, or inelastic?

3. Two charges with fixed positions are listed below: q1 = −4 µC at (−2 mm, 2 mm); q2 = −14 µC at (3 mm, 2 mm).

(a) (5 points) Determine the electric potential at the origin.

(b) (10 points) If an α-particle were placed at the origin, determine the electric force on the α-particle due to the fixed charges. Note: an α-particle is a helium nucleus, which is made of two protons and two neutrons.

(c) (10 points) Where could an α-particle be placed so that it would have no acceleration (ignore any gravitational effects).

PLEASE ANSWER ALL PARTS AND LABEL THEM. THANK YOU

Two stationary positive point charges, charge 1 of magnitude 3.20nC and charge 2 of magnitude 2.00nC , are separated by a distance of 42.0cm . An electron is released from rest at the point midway between the two charges, and it moves along the line connecting the two charges.

What is the speed v-final of the electron when it is 10.0cm from charge 1?

A 210 turn flat coil of wire 25.0 cm in diameter acts as an antenna for FM radio at a frequency of 100 MHz. The Magnetic field of the incoming electromagnetic wave is perpendicular to the coil and has a maximum strength of 9.30*10^-13 T.

What power is incident on the coil?

What average emf is induced in the coil over one-fourth of a cycle?

If the radio receiver has an inductance of 2.30 microH, what capacitance must it have to resonate at 100 MHz.

Consider a head-on, elastic collision between a massless photon (momentum p_o and energy E_o ) and a stationary free electron.

a) Assuming that the photon bounces directly back with momentum p (in the direction of p_o ) and energy E, use conservation of energy and momentum to find p.

b) Verify that your answer agrees with that given by Compton's formula with theta = pi.

One string of a certain musical instrument is 78.0cm long and has a mass of 8.78g . It is being played in a room where the speed of sound is 344 m/s.

Part A

To what tension must you adjust the string so that, when vibrating in its second overtone, it produces sound of wavelength 0.754m ? (Assume that the breaking stress of the wire is very large and isn

Two identical conducting spheres, fixed in place, attract each other with an electrostatic force of -0.6825 N when separated by 50 cm, center-to-center. The spheres are then connected by a thin conducting wire. When the wire is removed, the spheres repel each other with an electrostatic force of 0.1986 N. What were the initial charges on the spheres? Since one is negative and you cannot tell which is positive or negative, there are two solutions. Take the absolute value of the charges and enter the smaller value AND larger value.

If the wavefunction for a system is a superposition of wavefunction, the wavefunction of the system cannot be determined. Explain this statement.

How do electric charges move in an electric field?

a. Positive charges move in the direction of the electric field, whereas negative charges move in the opposite direction

b. Negative charges move in the direction of the electric field, whereas positive charges move in the opposite direction

c. Both positive and negative charges move in the direction of the electric field

d. Both positive and negative charges move in the opposite direction of the electric field

e. It depends on the electric field