A ball is thrown vertically upwards at 24.5 m/s. For its complete trip (up and back down to the starting position), its average speed is
a. 18.4 m/s.
b. 12.3 m/s.
c. 24.5 m/s.
d. 6.1 m/s
e. not given.
b
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a. potential c. bio-chemical b. thermal d. kinetic
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What will be an ideal response?
A car enters a level, unbanked semi-circular hairpin turn of 300 m radius at a speed of 40 m/s. The coefficient of friction between the tires and the road is ? = 0.25 . If the car maintains a constant speed of 40 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.
The physical characteristic that is used to distinguish intrusive igneous rocks from extrusive igneous rocks is _____________
a. silica content b. hardness c. color d. grain size