A proton moving at a speed of 3.8 106 m/s cuts across the lines ...

[HCHenry]

A proton moving at a speed of 3.8  106 m/s cuts across the lines of a magnetic field at an angle of 40. The strength of the field is 0.25  10-4 T. What is the magnitude of the force acting on the proton? (qp = 1.6  10-19 C)
 a. 1.4  10-17 N
  c. 9.8  10-18 N
  b. 2.3  10-17 N
  d. 5.1  10-18 N

Question 2

A balloon of negligible mass is filled with 300 m3 of helium. How big a payload can the balloon lift? (The density of air is 1.29 kg/m3; the density of helium is 0.18 kg/m3.)
 a. 150 kg
  c. 333 kg
  b. 300 kg
  d. 444 kg

[kescobar@64]

Answer to Question 1

C

Answer to Question 2

C

[HCHenry]

Thanks for the timely response, appreciate it

[ebonylittles]

Wow, this really help