Satellite Motion: A satellite having orbital speed V orbits a planet of mass M. If the planet had half as much mass, the orbital speed of the satellite at the same distance from the center would be
A. V
.
B. 2V.
C. V.
D. V/
.
E. V/2.
Answer: D
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Friction: A 50-kg box is being pushed along a horizontal surface. The coefficient of static friction between the box and the ground is 0.65, and the coefficient of kinetic friction is 0.35. What horizontal force must be exerted on the box for it to accelerate at 1.2 m/s2?
A. 60 N B. 120 N C. 170 N D. 230 N E. 490 N
In any star cluster, stars with lower masses greatly outnumber those with higher masses
Indicate whether the statement is true or false
Circular Motion of Charges: A doubly charged ion with speed 6.9 × 106 m/s enters a uniform 0.80-T magnetic field, traveling perpendicular to the field. Once in the field, it moves in a circular arc of radius 30 cm. What is the mass of this ion? (e = 1.60 × 10-19 C)
A. 11 × 10-27 kg B. 6.7 × 10-27 kg C. 3.3 × 10-27 kg D. 8.2 × 10-27 kg
An annular solar eclipse occurs every year.
Answer the following statement true (T) or false (F)