Physics Answers

Determine the ratio of stimulated and spontaneous emission rates. Predict the temperature at which these rates will be same for wavelength 1000 nm.

How many electrons move through a single 35.0 W headlight? How many electrons pass through it each second

11. A proton (+q) is 50nm away from an electron (-q) which is 30nm away from another proton (+2q) with

a charge +2q. What is the net electric force on +2q?

12. What is the direction of the net electric force on +2q?

13. What is the net electric field at +2q?

14. What is the net electric force on the proton (+q) in number 11?

Copper has a density of 9 g/cm3 and a bulk modulus of 1.2 x 1011 N/m2. What is the speed of a wave through it?

A crate slide down a caugo ramp that is inclined at 37 degrees. If the coefficient of the friction between the crate and and the ramp is 0.15, what is the acceleration of the crate? what must the coefficient of the friction be in order for the crates to remains stationary and not to slide on the ramp?

A molecules pf oxygen possess a charges of -2C and 2C separated from a distance of 0.2.Calculate the dipole moment in this conditiom

2 charged particles reacted with a force of 0.40 N with a distance of 1.6 cm, the 2nd charge contains 60 nC. Find the value of the first charge.

If a is equal to 1.2 ± 0.1cm, b=2.0 ± 0.2cm, c=1.05±0.05cm, calculate the following with the errors and standard errors

(i) ab/C³

(ii) ABC

(iii) C²a³/b²

If a is equal to 1.2 ± 0.1cm, b=2.0 ± 0.2cm, c=1.05±0.05cm, calculate the following with the errors and standard errors

(i) ab/C³

(ii) ABC

(iii) C²a³/b²

If a is equal to 1.2 ± 0.1cm, b=2.0 ± 0.2cm, c=1.05±0.05cm, calculate the following with the errors and standard errors

(i) ab/C³

(ii) ABC

(iii) C²a³/b²