A rocket engine consumes 450 kg of fuel per minute. If the exhaust speed of the ejected fuel is 5.2 km/s, what is the thrust of the rocket?
A. 42 kN
B. 39 kN
C. 45 kN
D. 48 kN
E. 35 kN
Answer: B
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About how many galaxies are presently known in our Local Group?
A) 3 B) 27 C) 55 D) 107 E) 254
A boat travels upstream and after one hour has gone 10 km. The boat next travels downstream and after one hour has gone 16 km. If the boat's speed relative to the water is constant, what is the speed of the current in the river?
a. 1 km/h c. 3 km/h b. 2 km/h d. 4 km/h
Two parallel plates that are initially uncharged are separated by 1.7 mm, have only air between them, and each have surface areas of 16 cm2
How much charge must be transferred from one plate to the other if 1.9 J of energy are to be stored in the plates? (?0 = 8.85 × 10-12 C2/N ? m2) A) 5.6 ?C B) 4.0 ?C C) 8.0 ?C D) 0.60 mC
_________is the major alloy element in the highest-strength copper alloys.
Fill in the blank(s) with the appropriate word(s).