A toy rocket with a mass of 300 g takes off in a vertical direction under the influence of gravity. It burns fuel at the rate of 25 g/s. The exhaust speed of the gases is 80 m/s. What is the speed of the rocket at the end of 10 seconds?
A)
145 m/s
B)
480 m/s
C)
40 m/s
D)
0 m/s
E)
382 m/s
A
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A 2 000-kg truck traveling at a speed of 6.0 m/s makes a 90° turn in a time of 4.0 s and emerges from this turn with a speed of 4.0 m/s. What is the magnitude of the average resultant force on the truck during this turn?
a. 4.0 kN b. 5.0 kN c. 3.6 kN d. 6.4 kN e. 0.67 kN
Why might increasing the temperature alter the rate of a chemical reaction?
A) The molecules will have a higher kinetic energy and bump into one another harder. B) The molecules are less reactive at higher temperatures. C) The molecules will more likely combine with other atoms at high temperature to save space. D) The density decreases as a function of temperature and this leads to an increase in volume which drops the rate of reaction. E) none of the above
Which of these is NOT a consequence of resonance?
A) the Moon's periods of rotation and revolution are equal B) the orbital periods of Neptune and Pluto C) the Kirkwood Gaps in the asteroid belt D) Venus' cloud and surface rotation rates E) Mercury's rotation and revolution around the Sun
A small boat is moving at a velocity of 3.35 m/s when it is accelerated by a river current perpendicular to the initial direction of motion. If the acceleration of the current is 0.750 m/s2, what will be the new velocity of the boat after 33.5 s?
A) 25.3 m/s at 82.4° from initial direction of motion B) 25.3 m/s at 7.59° from initial direction of motion C) 640.1 m/s at 82.4° from initial direction of motion D) 640.1 m/s at 7.59° from initial direction of motion