What is the typical size of a comet's nucleus?
A) 10 km
B) 1 meter
C) 100 km
D) 1000 km
E) Sizes are unknown because the nucleus is obscured by the coma.
A
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Springs: A force of 30 N stretches a very light ideal spring 0.73 m from equilibrium. What is the force constant (spring constant) of the spring?
A. 41 N/m B. 22 N/m C. 34 N/m D. 46 N/m
An ion engine provides a small but constant force on a spacecraft as it moves from Earth to Pluto. Compare the speed of the spacecraft near the beginning of its journey with its speed as it flies past Pluto.
A. The spacecraft's speed at Pluto is slower than its speed near Earth. B. The spacecraft's speed at Pluto is faster than its speed near Earth. C. The spacecraft's speed at Pluto is the same as its speed near Earth. D. The relative speed cannot be determined with the information given.
Which of the following procedures would not be expected to increase the fatigue-crack initiation life of a plain low-carbon steel?
(a) Case hardening (b) Shot peening (c) Decreasing the grain size (d) Annealing
New incandescent bulbs are more efficient than older types of incandescent bulbs
What will be an ideal response?