A radioactive substance with a half-life of 3.0 days has an initial activity of 2400 Bq. What is its activity after 6.0 days?
A) 1200 Bq
B) 1800 Bq
C) 600 Bq
D) 300 Bq
E) 150 Bq
C
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Explain what keeps the nuclear reactions in a star under control; i.e., what would happen if too large an amount of energy is released in the center?
What will be an ideal response?
Sort the following hypothetical discoveries into the appropriate bins as follows:
Consistent with theory: The statement describes a discovery that we could reasonably expect to find if the nebular theory is correct.
Not consistent with theory: The statement describes a discovery that would force us to modify or discard the nebular theory.
Small deviations in a planet's orbital motion:
A) show we don't fully understand gravitational forces yet. B) indicate the presence of an extensive atmosphere. C) indicate the presence of a powerful magnetic field. D) imply the nearby presence of a massive body. E) show the planet's orbit isn't stable.
A rocket with a mass of 2.0 × 106 kg is designed to take off from the surface of the earth by burning fuel and ejecting it with an exhaust speed of 3500 m/s
What is the minimum rate at which the fuel should be consumed in order to attain liftoff? A) 5.6 × 103 kg/s B) 1.4 × 103 kg/s C) 1.8 × 103 kg/s D) 2.8 × 103 kg/s E) 18 × 103 kg/s