What can you conclude about a Type I supernova?
A) It was originally a high-mass star.
B) Its spectrum will show large amounts of hydrogen.
C) It was originally a low-mass star.
D) Its core was mostly iron.
E) The star never reached the Chandrasekhar limit.
C
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The oldest fossils on Earth
a. show that life began in Africa. b. show that life began in lush regions between large rivers. c. show that life began in the oceans. d. are at least 5 billion years old. e. at most 5 million years old.
A vessel containing 10 kg of water is left out where it evaporates. If the temperature remains constant at 20°C, what is the change in entropy (in kcal/K)? (The latent heat of vaporization at 20°C is 585 cal/g.)
A. 30 B. 10 C. 20 D. 40 E. 290
While driving down the highway a lovebug spatters onto your windshield. Which experiences the greater force of impact?
A) the lovebug B) your car C) both the same but with different consequences
A 460-turn solenoid of length 30.0 cm and radius 4.00 cm carries a current of 3.50 A. What is the magnetic field strength inside the coil at its midpoint?What is the magnetic flux through a circular cross-sectional area of the solenoid at its midpoint?
a. 1.02E–5 T/m2 b. 3.05E–6 T/m2 c. 2.49E–7 T/m2 d. 3.39E–5 T/m2