2.5 Use the de Broglie relation λ=h/p to find the wavelength of electrons with kinetic energy equal to 550 eV. Indicate if relativistic or classical calculations are required.

2.3 Determine the energy of an electron and a photon if each has momentum equal to 1.071 x 10-21 kgm/s. Provide answer with 4 significant figures.ual to 550 eV. Indicate if relativistic or classical calculations are required.

In: Physics

An *L*-*R*-*C* series circuit consists of a
60.0 Ω resistor, a 10.0 *μ*F capacitor, a 3.60 mH inductor,
and an ac voltage source of voltage amplitude 60.0 V operating at
1450 Hz .

a.) Find the current amplitude across the inductor, the resistor, and the capacitor.

b.) Find the voltage amplitudes across the inductor, the resistor, and the capacitor.

c.) Why can the voltage amplitudes add up to *more* than
60.0 V ?

d.) If the frequency is now doubled, but nothing else is changed, which of the quantities in part A and B will change?

- only current amplitude will change

-only voltage amplitude across the inductor and capacitor will change

-only voltage amplitude across the inductor will change

-current amplitude and voltage across the any circuit element will change

e.) Find new current amplitude across the inductor, the resistor, and the capacitor.

f.) Find new voltage amplitudes across the inductor, the resistor, and the capacitor.

In: Physics

1) Conceptual **differences** and
**differences in equations** between the electric
dipole and magnetic dipole.

Add as much information as possible please.

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Does the acceleration vector change at all throughout the projectile’s flight? Why or why not?

Compare two complementary angles such as 30? and 60?. What is the same? What is different?

How does changing the initial velocity affect the projectile’s motion?

How does the time spent in the air depend on the launch angle?

In: Physics

using energy: a mass, m1 = 5kg, resting on a frictionless ramp is connected to a cable that passes over a pulley which is then attached to a second hanging mass, m2 = 2. see diagram. if the blocks are released from rest, then how far will the have moved when their velocities are 4 m/s

In: Physics

You wish to buy a new freezer for your basement. The primary use of the freezer will be to prepare ice for family parties. You have a very large family, with grandparents, parents, sisters, brothers, uncles, aunts, cousins, nephews, nieces, and grandchildren. As a result, family birthday parties are held every couple of weeks, and you need lots of ice for drinks. You want the freezer to convert 10.1 kg of water at 23.0°C to 10.1 kg of ice at

−9.4°C

in 2.00 h. But, in order to keep your electric bill down, you
want the power rating of the freezer to stay below 100 W. From
these requirements, you determine the minimum COP of the freezer
that will satisfy your needs. (Consider that the specific heat of
water is 4,186 J/(kg · °C), the specific heat of ice is 2,090 J/(kg
· °C), the latent heat of fusion of water is 3.33 ✕ 10^{5}
J/kg, and the latent heat of vaporization of water is 2.26 ✕
10^{6} J/kg.)

In: Physics

With the aid of a diagram, write a short account of the image formation process in the human eye. Include notes on the correction of common conditions (myopia, hypermetropia and presbyopia) using suitable lenses

In: Physics

1. What is a given= 0.215 [ms^-2] and diameter of disk with uniform mass distribution= 19.5 [cm].

theta= ?

2. Using information found in previous question, if the dropping mass is 195 [g], then what is T?

T= ? [Nm]

In: Physics

A hollow plastic sphere is held below the surface of a freshwater lake by a cord anchored to the bottom of the lake. The sphere has a volume of 0.700m3 and the tension in the cord is 840N. What is the mass of the sphere?

In: Physics

height |
time1 |
time2 |
time3 |
time4 |
avg time |

2 m |
0.45 s |
0.43 s |
0.35 s |
0.36 s |
0.39 s |

1.8 m |
0.4 s |
0.5 s |
0.48 s |
0.42 s |
0.38 s |

1.4 m |
0.41 s |
0.36 s |
0.37 s |
0.33 s |
0.37 s |

1.1 m |
0.37 s |
0.33 s |
0.33 s |
0.40 s |
0.36 s |

**1) Using one of your heights and times from when the
object was released to when the object hits the floor, calculate g.
(This is an experimental value of g)**

**2) Using all of you height data points, figure out how
to make a linear graph of height and time. Determine the slope of
the graph. This is related to your second experimental value of g.
Determine your second experimental value of g.**

**3) compare both your experimental values of g to the
theoritcal value.**

**4) What is the percentage difference btween your
experimetal values of g and the accepted value, 9.81m/s2
?**

**5) How do you account fo this difference?**

**6) Does the theoritcal value for g fall within the final
error range (the uncertainity) of your experimental
value?**

**7) Explain with the primary limitation on your data and
how it can be corrected. What factor in the experiment had the
biggest effect on collecting valid data and how would you make the
experiment more accurate?**

**please answer all questions and show work**

In: Physics

Correct asnwer for 5 star rating.

Suppose that you release a small ball from rest at a depth of
0.520 m below the surface in a pool of water. If the density of the
ball is 0.285 that of water and if the drag force on the ball from
the water is negligible, how high above the water surface will the
ball shoot as it emerges from the water? (Neglect any transfer of
energy to the splashing and waves produced by the emerging
ball.)

INCLUDE UNITS ON ANSWER

In: Physics

Cesium-124 has a half-life of 30.9 s.

a) How many Cs-124 nuclei are in 19 micrograms of said isotope?

b) How about after 2.4 min?

c) How strong is its activity then?

d) After which time has activity dropped below 1.0 Bq?

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What is fluorescence and how is it generated? explain absorption and emission

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The two wires carry current i_{1} and i_{2},
respectively, with positive current to the right. The charge q is
positive and has velocity v to the right.

True False If i_{1} is greater than
i_{2}, then the force on q is north.

True False If v = 0, then the force on q is zero.

True False If i_{2} = - i_{1} then the
force on q equals zero.

True False If i_{2} = 0 and i_{1} is
greater than zero, then the force on q points into the page.

True False If i_{1} = 0 and i_{2} is
greater than zero then the force on q is south.

True False If i_{2} = 0 and i_{1} is
greater than zero, then the magnetic field near charge q points out
of the page.

True False If i_{1} = i_{2}, then the
wires are attracted to each other.

Incorrect. | Tries 4/20 | Previous Tries |

In: Physics