About how long is the solar cycle (evidenced by sunspots)?
A. 3 years
B. 11 years
C. 22 years
D. 5 days
Answer: B
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Radioactive Decay: The activity of a sample reduces from 7.55 × 109 Bq to 5.11 × 109 Bq in 5.50 months.(a) What is its half life?(b) How many months from the start must one wait for the activity to decrease to 10% of its original value?
What will be an ideal response?
A closed cubical chamber resting on the floor contains oil and a piston
If you push down on the piston hard enough to increase the pressure just below the piston by an amount ?p, which of the following statements is correct? (There could be more than one correct choice.) A) The pressure on the sides of the chamber will not increase. B) The pressure at the top of the oil will increase by less than ?p. C) The pressure everywhere in the oil will increase by ?p. D) The increase in the force on the top of the chamber will be the same as the increase in the force on the bottom of the chamber. E) The pressure at the bottom of the oil will increase by more than ?p.
Of the following systems, which contains the most heat?
a. 100 kg of water at 80°C c. 600 kg of ice at 0°C b. 250 kg of water at 40°C d. Systems do not contain heat.
In Figure 7.4, the time for the fraction of residual strain in iron to drop to 0.6 at 400°C is 137 minutes, and at 450°C it is 15 minutes.
(a) Calculate the activation enthalpy for the recovery of cold work in iron. (b) Comment on the magnitude of the activation enthalpy for recovery in comparison to the activation enthalpy for vacancy diffusion in iron, and justify your result.