If the escape speed of a star is equal to the speed of light, its radius is the so-called Schwarzschild radius. What is the Schwarzschild radius of the sun, whose mass is 
A. 4.5 km
B. 1.5 km
C. 5.9 km
D. 3.0 km
D. 3.0 km
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An object is placed at F in front of a concave mirror with a focal length of 10 cm. What is the position of its image in relation to the mirror and what are its characteristics?
A) = 10 cm, real, smaller than object B) = 10 cm, virtual, smaller than object C) = 20 cm, real, bigger than object D) = 20 cm, virtual, bigger than object E) = ?, real, much bigger than the object
A 30-kg child rides on a circus Ferris wheel that takes her around a vertical circular path with a radius of 20 m every 22 s. What is the magnitude of the resultant force on the child at the highest point on this trajectory?
a. 49 N b. 0.29 kN c. 0.34 kN d. 0.25 kN e. 0.76 kN
Which of these shows one cycle of the wave?
a. 
b. 
c. 
d. 
Ionic bonding is caused by
A) the sharing of electrons between atoms. B) the transfer of electrons between atoms. C) unequal charge distributions around neutral molecules. D) atoms bonding to hydrogen molecules. E) atoms bonding to oxygen molecules.