For general projectile motion, when the projectile is at the highest point of it
ID: 1633795 • Letter: F
Question
For general projectile motion, when the projectile is at the highest point of its trajectory A) its acceleration is zero. B) its velocity is perpendicular to the acceleration. C) its velocity and acceleration are both zero. D) the horizontal component of its velocity is zero. E) the horizontal and vertical of its velocity are zero. A boy throws a rock with an initial velocity of 2.15 m/s at 30.0 degree above the horizontal. If air resistance is negligible, how long does it take for the rock to reach the maximum height of its trajectory? A) 0.110 s B) 0.194 s C) 0.215 s D) 0.303 s A 60.0-kg person rides in elevator while standing on a scale. The elevator is traveling downward but slowing down at a rate of 2.00 m/s^2. The reading on the scale is closest to A) 589 N. B) 708 N. C) 469 N. D) 120 N. E) 349 N. Which contains more moles of material: 80 grams of helium gas (He, having atomic weight 4.0 g/mol) or 400 grams of argon gas (Ar, having atomic weight 40 g/mol)? A) helium B) argon C) Both contain the same number of moles. A 200-cm organ pipe with one end open is in resonance with a sound wave of wavelength 270 cm. The pipe is operating in its: A. fundamental frequency B. second harmonic C. third harmonic D. fourth harmonic E. fifth harmonic If you swing a bucket of water fast enough in a vertical circle, at the highest point the water does not spill out because an outward force balances the pull of gravity on the water. A) True B) False The intensity of a certain sound wave is 6 mu W/cm^2. If its intensity is raised by 10 db, the new intensity is: A. 60 mu W/cm/^2 B. 6.6 mu W/cm/^2 C. 6.06 mu W/cm/^2 D. 600 mu W/cm/^2 E. 12 mu W/cm/^2Explanation / Answer
According to the given problem,
13.) B : Its velocity is perpendicular to the acceleration
14.) A : 0.11 s
15.) B : 708 N
16.) A : Helium 20 moles
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