Instantaneous speed and average speed are equal
a. always. b. for motion at constant speed.
c. for accelerated motion. d. never.
b
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Approximately how fast is a person located at the Earth's equator moving around Earth's axis due to the rotation of the Earth?
A) 17,000 km/hr B) 1700 km/hr C) 170 km/hr D) 17 km/hr E) not moving at all
What are we made of?
A.) Dark energy. B.) Dark matter. C.) Atoms.
When a sky diver exits an airplane his
A. acceleration is at a maximum. B. velocity is at a maximum. C. acceleration remains constant. D. acceleration is at a minimum.
Addition by 1. Components: The figure shows four vectors, 
, 
, 
, and 
, having magnitudes 12.0 m, 10.0 m, 8.0 m, and 4.0 m, respectively. The sum of these four vectors is 
A. 16.4 m at an angle 77.8° with respect to +x-axis. B. 16.4 m at an angle 12.3° with respect to +x-axis. C. 19.5 m at an angle 77.8° with respect to +x-axis. D. 19.5 m at an angle 12.3° with respect to +x-axis. E. 8.20 m at an angle 77.8° with respect to +x-axis.