A toy rocket is launched vertically from ground level at time t = 0.00 s. The rocket engine provides constant upward acceleration during the burn phase
At the instant of engine burnout, the rocket has risen to 64 m and acquired an upward velocity of 60 m/s. The rocket continues to rise with insignificant air resistance in unpowered flight, reaches maximum height, and falls back to the ground. The time interval during which the rocket engine provided the upward acceleration, is closest to
A) 2.1 s.
B) 2.3 s.
C) 1.9 s.
D) 1.7 s.
E) 1.5 s.
A
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An electron moving perpendicular to a uniform magnetic field of 3.2 × 10-2 T moves in a circle of radius 0.40 cm. How fast is this electron moving? (e = 1.60 × 10-19 C, melectron = 9.11 × 10-31kg)
A) 2.2 × 107 m/s B) 1.9 × 107 m/s C) 1.9 × 106 m/s D) 3.0 × 107 m/s E) 0.80 × 107 m/s
Current evidence suggests that life on Earth
A) originated in shallow ponds on land B) was delivered from elsewhere in meteorites C) was deliberately planted by an advanced civilization D) originated close to deep-sea volcanic vents or underground
How are the "geological record" and the "fossil record" related?
A) the geological and fossil records are completely unrelated B) the fossil record is part of the geological record C) the geological record is part of the fossil record D) the geological record and the fossil record are just different names for the same thing
When the slit width is doubled, what happens to the width of the central maximum in the diffraction pattern?
A. nothing B. it doubles C. it halves D. it quadruples E. it quarters