How do today's human-built nuclear power plants on Earth generate energy?
A) chemical reactions
B) nuclear fusion
C) nuclear fission
D) converting kinetic energy into electricity
E) converting gravitational potential energy into electricity
C) nuclear fission
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Convection never occurs in the core of any type of star
Indicate whether the statement is true or false
Mass on a Spring: A 0.250-kg stone is attached to an ideal spring and undergoes simple harmonic oscillations with a period of 0.640 s. What is the force constant (spring constant) of the spring?
A. 2.45 N/m B. 12.1 N/m C. 24.1 N/m D. 0.102 N/m E. 0.610 N/m
A swimmer heading directly across a river that is 200 m wide reaches the opposite bank in 6 min 40 s. During this swim, she is swept downstream 480 m. What is the speed of the current?
A) 0.50 m/s B) 0.80 m/s C) 1.2 m/s D) 1.4 m/s E) 1.8 m/s
Which of the following ingredients was least abundant in the solar nebula?
A) metal B) rock C) hydrogen compounds D) hydrogen E) helium