If a 10°C piece of iron is heated until it has twice as much internal energy, its temperature will be
A) 20°C.
B) 273°C.
C) 293°C.
D) 566°C.
E) none of the above
Answer: C
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Significant Figures: The last page of a book is numbered 764. The book is 3.0 cm thick, not including its covers. What is the average thickness (in centimeters) of a page in the book, rounded to the proper number of significant figures?
A. 0.0039 cm B. 0.072 cm C. 0.0079 cm D. 0.00393 cm E. 0.00785 cm
A 3.0-m rod is pivoted about its left end. A force of 10 N is applied perpendicular to the rod at a distance of 1.2 m from the pivot causing a ccw torque, and a force of 5.2 N is applied at the end of the rod 3.0 m from the pivot. The 5.2-N force is at an angle of 30o to the rod and causes a cw torque. What is the net torque about the pivot? (Take ccw as positive.)
a. 18 N•m c. 4.2 N•m b. -18 N•m d. -4.2 N•m
What happened during the accretion phase of the early solar system?
A) Atoms of hydrogen and helium gas bonded together and solidified. B) Particles grew by colliding and sticking together. C) The solar nebula differentiated into metals inside of the frost line and ices beyond. D) Large planetesimals captured atmospheres from the solar nebula. E) Earth gained its oceans from icy planetesimal capture.
Momentum: What is the momentum of a proton when it is moving with a speed of 0.60c? (mproton = 1.67 × 10-27 kg)
A. 1.2 × 10-19 kg? m/s B. 1.5 × 10-19 kg ? m/s C. 3.0 × 10-19 kg ? m/s D. 3.8 × 10-19 kg ? m/s