At a certain instant, a proton is moving in the positive x direction through a magnetic field in the negative z direction. What is the direction of the magnetic force exerted on the proton?
1.positive z direction
2.negative z direction
3.positive y direction
4.negative y direction
5.The force is zero.
3
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Describe the impact the discovery of extrasolar planets h as had for understanding the origin of our own Solar System
What will be an ideal response?
The local solar time at 75°W is 12:00 noon. What is the longitude of an observer who sees the full moon on her meridian at this time?
a. 105°E b. 75°E c. 15°E d. 15°W e. None of the above
Two masses are being pulled up a frictionless 30.0 degrees incline by a force F parallel to the incline. The acceleration up the incline is 1.00 
The force is applied to a 200 kg mass and a string connects the 200 kg mass to a 150 kg mass. The force F is
A. 875 N. B. 980 N. C. 1,140 N. D. 1,720 N. E. 2,070 N.
The rotation curve of a galaxy can be used to determine
a. the relative number of hot young stars in the galaxy. b. the relative amount of gas and dust in the galaxy. c. the radius of the galaxy. d. the luminosity of the galaxy. e. the mass of the galaxy.