A projectile is fired over a horizontal surface at an angle of elevation of 70°. Neglecting air resistance, what are possible angles in flight between the acceleration vector and the velocity vector?
a. 170° and 40°
c. 90° and 15°
b. 120° and 70°
d. none of the above
B
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The time for the Moon to orbit Earth, relative to the stars is
A) 23 hours, 56 minutes. B) about 7 days. C) 27.3 days. D) 29.5 days. E) 18 years, 11.3 days.
The change in size of an object due to thermal expansion depends upon
a. what the object is made of b. the object's original size c. how much the temperature changes d. A and C e. all of the above
A Group 6A nonmetal would be most likely to form an ionic bond with an element of Group
a. 4A. b. 8A. c. 2A. d. 5A.
Suppose your normal resting heart rate is 60 beats per minute. Now, suppose you board a spaceship that travels away from Earth at 90% of the speed of light. While on the ship, you measure your heart rate. What will it be?
A) It will be 46 beats per minute. B) It will be 74 beats per minute. C) It will still be 60 beats per minute. D) It will be 12 beats per minute.