For general projectile motion with no air resistance, the vertical component of a projectile's acceleration
A) is always zero.
B) remains a non-zero constant.
C) continuously increases.
D) continuously decreases.
E) first decreases and then increases.
B
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When a spinning ice skater pulls in his arms, he spins faster because
A) his angular momentum must be conserved, so reducing his radius must increase his speed of rotation. B) there is less friction with the air. C) there is less friction with the ice. D) there exists an unbalanced reaction force.
During takeoff a jet aircraft goes from 0 m/s to 60 m/s in 5 seconds. (a) What is the jet's acceleration? (b) What is the jet's speed after 22 seconds?
The explanation for all types of refraction involves a change in
A) frequency. B) period. C) speed. D) all of the above E) none of the above
If 480 C pass through a 4.0-W resistor in 10 min, what is the potential difference across the resistor?
a. 3.6 V b. 2.8 V c. 2.4 V d. 3.2 V e. 5.0 V