There are three types of collapsed, burned-out stars: white dwarfs, neutron stars, and
A) black holes. B) quasars. C) supernova. D) red giants. E) X-ray stars.
A
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A rock is thrown from the roof of a building, with an initial velocity of 10 m/s at an angle of 30° above the horizontal. The rock is observed to strike the ground 43 m from the base of the building
What is the height of the building assuming no air resistance?
A sievert (Sv) is
A) the SI unit of absorbed dose = 1 J/kg = 100 rad. B) 10-2 J/kg. C) 3.70 × 1010 decays/s in radium. D) a dosage of 2.58 × 10-4 C/kg. E) the effective dose of 1 Gy.
Running water played a major role in shaping Mars in ancient times
Indicate whether the statement is true or false
An object of mass 0.50 kg is transported to the surface of Planet X where the object's weight is measured to be 20 N. The radius of the planet is 6.0 × 10^6 m. What is the mass of Planet X? (G = 6.67 × 10^?11 N / m2/kg2)
a. 1.80E+18 kg b. 5.40E+24 kg c. 2.16E+25 kg d. 1.80E+18 kg