How big is Earth on the 1-to-10 billion scale described in Section 1.2?
What will be an ideal response?
Scaled radius of Earth = actual radius / 1010
= 6,378 km / 1010
= 6,378 × 105 cm / 1010
= 6.378 × 108 cm / 1010
= 6.378 × 10-2 cm
= 0.6 mm
This is about the size of the tip of a (fine tip) ballpoint pen.
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A car enters a level, unbanked semi-circular hairpin turn of 100 m radius at a speed of 28 m/s. The coefficient of friction between the tires and the road is ? = 0.800 . If the car maintains a constant speed of 28 m/s, it will
a. attempt to dig into the road surface. b. tend to veer toward the center of the semicircle. c. arrive safely at the end of the semicircle. d. tend to veer toward the outside of the circle. e. veer toward the center for the first quarter-circle, then veer toward the outside for the second quarter-circle.
If the final temperature was determined incorrectly (a value greater than the true value was obtained), how would this affect the calculated value of the specific heat? Explain your answer
That Earth ____ , evidence that Earth differentiated
a. rotates slowly b. has an average density that is higher than the density of the crust c. has a no magnetic field d. has a surface that is 75% water e. all of these
A steel tube with diameters d2 5 86 mm and d1 5 52 mm is twisted by torques at the ends. The diameter of a solid steel shaft that resists the same torque at the same maximum shear stress is approxi-mately:
(A) 56 mm
(B) 62 mm
(C) 75 mm
(D) 82 mm