A swimmer heading directly across a river 200 m wide reaches the opposite bank in 6 min 40 s, during which time she is swept downstream 480 m
(a) How fast can she swim in still water?
(b) What is the speed of the current?
(a) 0.50 m/s (b) 1.2 m/s
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Projectile Motion: A ball thrown horizontally from a point 24 m above the ground, strikes the ground after traveling horizontally a distance of 18 m. With what speed was it thrown, assuming negligible air resistance?
A. 6.1 m/s B. 7.4 m/s C. 8.1 m/s D. 8.9 m/s
An electron moves with a constant horizontal velocity of 3.0 × 106 m/s, and no initial vertical velocity as it enters a deflector inside a TV tube
The electron strikes the screen after traveling 17.0 cm. horizontally and 40.0 cm vertically upward with no horizontal acceleration. What is the constant vertical acceleration provided by the deflector? (The effects of gravity can be ignored.) A) 2.5 × 1014 m/s2 B) 8.3 × 102 m/s2 C) 1.4 × 104 m/s2 D) 1.2 × 1014 m/s2
If you triple the rms voltage in an ac circuit, what happens to the maximum voltage?
A) It increases by a factor of . B) It decreases by a factor of . C) It decreases by a factor of 3. D) It increases by a factor of 3. E) It increases by a factor of 9.
A ball is thrown straight upward from ground level with a speed of 18m/s How much time passes before the ball strikes the ground if we disregard air resistance?
A) 3.7 s B) 0.6 s C) 1.8 s D) 1.1 s