In projectile motion the velocity at the top of the trajectory is
A. zero
B. non-zero, since the x component of the velocity has remained constant.
C. larger than at any other time during the trajectory.
B. non-zero, since the x component of the velocity has remained constant.
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You have observed a star and classified it as a white dwarf. It has a surface temperature of 3000 K and a luminosity of 10?3 times that of the Sun star based on its position in the H-R diagram. Can you determine its mass by plotting its position on an H-R diagram?
A) Yes, its mass is 0.3 MSun. B) Yes, its mass is 3 MSun. C) Yes, its mass is 30 MSun. D) No, a white dwarf's mass cannot be determined from its position on the H-R diagram.
The burst of X-rays from an X-ray burster is due to ________ of hydrogen on its surface
Fill in the blank(s) with correct word
A loop bent in the shape below carries a conventional current in the direction marked. What is the magnitude 
of the magnetic field at the point a on the diagram
due to just the horizontal segments of the loop? A. ?0I/4?R B. ?0I/4R C. ?0I/8R D. ?0I/2R E. ?0I/R F. Zero
Two small objects, with masses m and M, are originally a distance r apart, and the gravitational force on each one has magnitude F. The second object has its mass changed to 2M, and the distance is changed to r/4. What is the magnitude of the new gravitational force?
A. 32F B. 2F C. F/32 D. F/16 E. 16F