# Search results

1. ### Mass Defect of 7Li Nuclues

Homework Statement What is the mass defect of the 7Li nucleus (A = 7)? Homework Equations mass of 7Li nucleus per atomic table is 7.016004 u N = A-Z or #neutrons = 7-3 = 4 computed mass of proton and neutrons in nucleus = 3 p*mass of p + 4n *mass of n mass of proton = 1.00726 u mass of...

Ok..but what do I do with the equation..I can plug in values for d1 and d2 but am still left with m unknown as well as frequency...I am getting confused. Thanks for that explanation on the reasoning.

Thank you again..I am guessing that di is the sum of the path of the signal to the plane plus the elevation back down to Roger and that d2 is the path from the station straight to the ship. What do I do with m since it is unknown? I am concerned about negative signs here and am assuming I use...

Thank you eczeno! I found the lengths of the paths using pythagorean theorem but am unsure what to do with them next. Are they the wavelengths?

Homework Statement Roger in ship offshore listening to baseball game on his radio. He notices there is destructive interference when seaplanes from nearby Coast Guard station fly directly overhead at elevations of 777 m, 970 m, and 1163 m. The broadcast station is 98 km away. Assume there is...
6. ### Compound Microscope

I do not know if the answer is wrong but this is for web assign and I am trying to understand why they might be right. Can you tell me how you solved the problem?
7. ### Compound Microscope

The tube length is 16.7 and the f of objective lens 1.45 cm Per the solutions the distance for the objective distance is listed as 1.58. Help.
8. ### Compound Microscope

I is the tube length the angular magnification is not in cm N is the normal point for the eye - 25 cm d is the distance to the lens (d image is distance of image to lens and d object is distance of object to lens)
9. ### Compound Microscope

Homework Statement A microscope has an eyepiece that gives an angular magnification of 5.25 cm for a final image at infinity and an objective lens of focal length 1.45 cm. The tube length is 16.1 cm. a - What is the transverse magnification due to the objective lens alone? b - what is the...
10. ### Prism Optics Range of Refraction Angles

I understand most of what you are saying and drew a diagram. Would you reclarify something for me: Y is equal to B1 as they are alternating angles on the diagonal of the parallelogram. Then B2 equals x (opposite alternating angle on diagonal). How do I find x as I am not certain of the value...
11. ### Prism Optics Range of Refraction Angles

I made a drawing and can get the first angle of refraction from Snells Law into the prism. Then I have trouble from that point on determining the angle of exit from the right side of the prism. Does the sin of angle of entry into prism times n for prism equal the sin of angle of exit on the...
12. ### Prism Optics Range of Refraction Angles

I know that this equation can give me the D, the angle of minimum deviation, but I am not certain how that is important. I do not understand how to use the angle of incidence here.
13. ### Prism Optics Range of Refraction Angles

Homework Statement Equilateral triangle prism (angles all 60 degrees) made of crown glass. Index of refraction ranges from 1.486 for longest visible wavelengths to 1.556 for the shortest. What is range of refraction angles for the light transmitted into air through the right side of the...
14. ### Average Current in Coil Rotated in Magnetic Field

Homework Statement A circular conducting coil of radius 2.8 cm is placed in a uniform magnetic field of .900 T with the plane of the coil perpendicular to magnetic field. Coil rotated 180 degrees about the axis in .222 seconds. If the coil is made of copper with a diameter of .900 mm, what...
15. ### Monatomic Gas and Isotherm - W, U Calculations

Thanks..I got the 1520 in that other example by using the 1.013 e 5number to convert (I had used 1.0 e 5 earlier). Now how do I find the internal energy and total heat flow of the total process? I know that change in internal energy = Q-W. If I use change in U = 3/2*nRdeltaT and substitute PV...
16. ### Monatomic Gas and Isotherm - W, U Calculations

No. But in a similar problem with intervals on y axis to be 1 atm and values of lines on x axis to be 5, 10, and 20 L, the answer is -1520 Joules. I can't get this answer by adding the areas under B-C and C-D to get work (A-B is 0 since it is isochoric). Any ideas?
17. ### Monatomic Gas and Isotherm - W, U Calculations

Homework Statement . Suppose a monatomic ideal gas is changed from state A to state D by one of the processes shown on the PV diagram below, in which each interval on the vertical (P) axis corresponds to 2 atm, and the values of the lines on the horizontal (V) axis equal 1 L, 2 L, and 4 L...
18. ### Vertebrate and Number of Breaths - Ideal Gases

Homework Statement The volume of air taken in by warmblooeded vertebrate is 250 L/day at standard temperatutre and pressure (0 Degrees C and 1 atm). If air in lungs is at 43 degrees C under pressure of 440 mm HG and we assume vertebrate takes in average volume of 100cm cubed per breath at...
19. ### Percentage Change in Sound Intensity - Help

This is correct per webassign
20. ### Sound Intensity Problem of 3 Machines

Solved - just plug numbers into calculator for exponents!
21. ### Percentage Change in Sound Intensity - Help

Homework Statement An intensity level change of +2.00 dB corresponds to what percentage change in intensity! Homework Equations B = dB = 10 log (I/Io) The Attempt at a Solution 2.00 dB = 10 log (I/Io) 0.2 = log (I/Io) I/Io = 10e0.2 = 1.585 Assuming Io = 1, then percentage...
22. ### Sound Intensity Problem of 3 Machines

Homework Statement In a factory, 3 machines produce noise with intensity levels of 76 dB, 82 dB, and 85 dB. With all three running, what is the intensity level? Homework Equations B = 10 log (I/Io) The Attempt at a Solution B = 10 log (10e7.6 + 10e8.2 + 10e8.5) I do not know...
23. ### Chirping Bat and Distance to Moth - Sound Waves

The speed of sound in air is 343 m/s per my book and I put that in my information above, so I do not understand your information.
24. ### Chirping Bat and Distance to Moth - Sound Waves

Homework Statement A bat emits a chirping sounds of frequency 67 kHz while hunting for moths to eat. Suppose the bat emits a chirp that lasts for 1.00 ms adn then is silent while it listens for the echo. If the beginning of the echo returns just after the outgoing chirp is finished, how...
25. ### Change in density of water with depth

Homework Statement By what percentage does the density of water increase at a depth of 3.7 km below the surface? (change in p/p) Homework Equations P = pgh where p = density p of water = 1000 kg/m cubed h = 3.7 km = 3700 m bulk modulus of water (b) = 2 e 9 The Attempt at a Solution b = -...
26. ### Pressure Difference to Make Blood Flow Thru Artery

Homework Statement What is the pressure difference required to make blood flow through an artery of inner radius 2.0 mm and length 0.18 m at a speed of 5.6 cm/s? Homework Equations P1-P2 = Q8nL/pi*r fourth or P1-P2 = velocity*8*viscosity of blood*L/rsquared viscosity of blood = 4 x 10e-3 r =...
27. ### Blood Pressure Difference between Aorta and Aneurysym

Homework Statement Blood flowing thru aorta (radius 1.2 cm) enters aneurysym of radius 3.1 cm. How much on average is blood pressure higher inside the aneursym than the pressure in the unenlarged part of aorta? Average flow rate of blood thru aorta is 110 cm cubed/sec Homework Equations Q...
28. ### Decrease in Pressure Above a Lake

Does this mean that the pressure at 31 m above lake = atm pressure + pressure on surface area of lake? How do I calculate atmospheric pressure? So if P = Patm + Plake then isn't P atm = pgh and that is the decrease?
29. ### Decrease in Pressure Above a Lake

Homework Statement What is the approximate decrease in pressure in going 31 m above the surface of the lake? Air at 20 degrees C has density of 1.2 kg/mcubed. The pressure at the surface of the lake is 104 kPa Homework Equations Pressure = F/Area Force = density*area*height*g...
30. ### Blood pressure to make Blood Flow Thru Artery

Homework Statement What is the blook pressure difference required to make blood flow thru a capillary of radius 3.0 um and length 1.1 mm at a rate of 0.56 mm/s? Homework Equations P1 - P2 = ave speed (8nL) /r squared The Attempt at a Solution n of blood = 4 x 10 e-3 m/s ave...