Chewy

Please help and thanks

ok so here is what I have

When light of wavelength 288 nm is inci- dent on potassium, the emitted electrons have maximum kinetic energy of 2.41 eV.

What is the energy of an incident photon? The value of h c is 1240 eV · nm .

Answer in units of eV

For this part I do 1240/288 and thats the answer then theres though next part that I have done too

What is the work function for potassium? Answer in units of eV. And I Have this part done too its (1240/288)-2.41

---though then I'm asked. What is the threshold wavelength for the pho- toelectric effect with potassium?---

this is the one I'm stuck on. I think it uses the formualua kmax=hf-hfo where hfo is work function though I don't really know. If you could help me solve this last part I would be grateful of your help. Thanks

Answer in units of nm?

How fast must a muon travel so that its mean lifetime is 40 μs if its mean lifetime at rest is 2 μs?

Answer in units of c

I couldn't find much on this, if you could help in solving this it would be greatly appreciated. Thank you so much.

The annual energy requirement for the United States is on the order of 2.83 × 10^20 J . How many kilograms of matter would have to be released as energy to meet this requirement? The speed of light is 2.998 × 10^8 m/s.

Answer in units of kg

Thanks so much for the help

For a long period of time the switch S is in position “b”. At t = 0 s, the switch S is moved from position “b” to position “a”.Find the voltage across the 3 MΩ center-left resistor at time t1 = 4 s.

Answer in units of V

Image link:

http://tinypic.com/r/30mmnvp/6

thanks and much appreciated

Consider a circuit where the batteries have zero internal resistance and the currents are flowing in the direction indicated by the arrowsUsing the direction of the arrow as posi- tive (as shown), find the current through the 16.6 Ω resistor and the 6.6 V battery at the top of the circuit. A negative current denotes flow opposite to the direction of the arrow.

Answer in units of A

part 2

Using the direction of the arrow as positive (as shown), find the current through the 22.1 Ω resistor in the center of the circuit.

Answer in units of A

Image link: http://tinypic.com/r/316wawh/6

Thanks, I seemed to have had a lot of difficulties on this one, thx for the help if your able.

I am having difficulty learning how to first solve one of these types of problems. If you could help me It would be greatly appreciated, and I will review exactly how it was worked out to learn from this problem.

A circular arc has a uniform linear charge density of −4 nC/m.What is the magnitude of the electric field at the center of the circle along which the arc lies? The value of the Coulomb constant is 8.98755 × 109 N · m2/C2.

heres a photo link to what the problem looks like: http://tinypic.com/r/v6p4eg/6

and thank you so much

My parents basically are cutting me off after this summer, and online wells Fargo says I would have to have a verifiable income of at least $12,000 to be able to take out a student loan or would have to have a cosigner. My family won't cosign, so is there any place or any way I could get a student loan for this fall without a cosigner? I am going onto my third year of college. I am in immediate desperate need of help on this, please someone help me by having an answer to this question.

Boltzmann’s constant is 1.38066×10^−23 J/K.

Avogadro’s number is 6.02214 × 10^23 /mol.

Determine the temperature at which the

rms speed of an He atom equals 600 m/s.

Answer in units of K

What is the rms speed of He on the surface

of a certain star, where the temperature is

6012 K?

Answer in units of m/s

A gas contains a mixture of He and Ne. The

gas is at a temperature of 535 K, with 0.93mol

of He and 2 mol of Ne.

What is the average kinetic energy per

molecule of He? Avogadro’s number is

6.02 × 10^23 mol^−1, and Boltzmann’s constant

is 1.38 × 10^−23 J/K.

Answer in units of J

part2:What is the average kinetic energy per

molecule of Ne?

part3:What is the average total kinetic energy of

He?

Answer in units of J

part4:What is the average total kinetic energy of

Ne?

Answer in units of J

Thanks so much for the help

A pipe has a length of 1.38 m.

Determine the frequency of the first har-

monic if the pipe is open at each end. The

velocity of sound in air is 343 m/s.

Answer in units of Hz

What is the frequency of the first harmonic if

the pipe is closed at one end?

Answer in units of Hz

A spherical source radiates sound uniformly

in all directions. At a distance of 32 m, the

sound intensity level is 31 dB.

At what distance from the source is the

intensity level 21 dB?

Answer in units of m

What power is radiated by this source?

Answer in units of W

Thanks so much for your generous help.

A ukulele string is stretched to a length of 0.47 m and both ends are fixed. If the density of the string is 0.0013 kg/m and its tension is 50.9 N, what is the fundamental frequency?

Answer in units of Hz

Two ukulele strings, of equal length and mass are tuned so that the first string, when it vibrates at twice its fundamental frequency, has the same frequency as the second string when it vibrates at three times its fundamental frequency. The tension of the first string is 41 N. Calculate the tension F2 of the second string.

Answer in units of N

A wave is described by y = A sin(k x − w t) where A = 2 cm, k = 3.2 rad/m, w= 5.14 rad/s, x is in meters, and t is in seconds.

What is the wavelength?

Answer in units of m

What is the frequency?

Answer in units of Hz

What is the speed of the wave?

Answer in units of m/s

Thank you very much for your time.

A particle rotates counterclockwise in a circle of radius 7.5 m with a constant angular speed of 4.6 rad/s . At t = 0, the particle has an x coordinate of 1.9 m and y > 0 .

Determine the x coordinate of the particle

at t = 1.58 s .

Answer in units of m

Find the x component of the particle’s velocity at t = 1.58 s.

Answer in units of m/s

Find the x component of the particle’s acceleration at t = 1.58 s.

Answer in units of m/s^2

Thank you very much for your help

A simple pendulum has a period of 2.86 s. The acceleration of gravity is 9.8 m/s2 . What is its length?

Answer in units of m

What would its period be on the Moon, where gMoon = 1.67 m/s^2 ?

Answer in units of s

A horizontal platform vibrates with simple harmonic motion in the horizontal direction with a period of 0.97 s. A body on the platform starts to slide when the amplitude of vibration reaches 0.285 m.

Find the coefficient of static friction between body and platform. The acceleration of gravity is 9.8 m/s^2 .

Thanks for the possible help and explanation.

A car has a unibody-type frame and is supported by four suspension springs, each with a force constant of 38400 N/m. The combined mass of the car’s frame and everything inside it (the engine, the seats, the passengers, etc.) is 1400 kg. Because of worn-out shock absorbers, the car vibrates up and down every time it is driven over a pothole. What is the frequency of this vibration?

Answer in units of Hz

Thanks for the help

A block of mass 0.3 kg is attached to a spring of spring constant 24 N/m on a frictionless track. The block moves in simple harmonic motion with amplitude 0.21 m. While passing through the equilibrium point from

left to right, the block is struck by a bullet, which stops inside the block. The velocity of the bullet immediately before it strikes the block is 55 m/s and the mass of the bullet is 1.12 g.

Find the speed of the block immediately before the collision.

Answer in units of m/s

If the simple harmonic motion after the collision is described by x = Bsin(w t + theta), what is the new amplitude B?

Answer in units of m

The collision occurred at the equilibrium position. How long will it take for the block to reach maximum amplitude after the collision?

Answer in units of s.

Calculate the flow rate of blood (of den-

sity 0.932 g/cm^3) in an aorta with a cross-

sectional area of 1.71 cm^2 if the flow speed is

60.9 cm/s .

Answer in units of g/s

Assume the aorta branches to form a large

number of capillaries with a combined cross-

sectional area of 4440 cm^2 .

What is the flow speed in the capillaries?

Answer in units of cm/s

Air within the funnel of a large tornado mayhave a pressure of only 0.31 atm.What is the approximate outward force F on a 6.9 m × 19 m wall if a tornado suddenly envelopes the house? Atmospheric pressure is 1.013 × 10^5 Pa.

Answer in units of N

I tried this myself and missed the answer 3 times so if possible please provide a complete answer with an explanation. Thanks.