A spaceship is moving away from the earth with a constant speed of 0.80c. The spaceship fires a 28-kg missile with a speed of 0.50c relative to the spaceship
What is the speed of the missile measured by observers on the earth if the missile is fired
(a) away from the earth?
(b) toward the earth?
(a) 0.93c (b) 0.50c
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What was the temperature of the Universe when the recombination took place that produced the cosmic background radiation we observe today?
a. about 2.7 K b. about 300 K c. about 3000 K d. about 3 million K e. about 3 billion K
Pascal's Principle: In a hydraulic garage lift, the small piston has a radius of 5.0 cm and the large piston has a radius of 15 cm. What force must be applied on the small piston in order to lift a car weighing 20,000 N on the large piston? Assume the pistons each have negligible weight.
A. 6.7 × 103 N B. 5.0 × 103 N C. 2.9 × 103 N D. 2.2 × 103 N
Consider an apple falling from a tree. Which of the following applies to this situation?
A. Earth is attracting the apple. B. The apple is attracting Earth. C. Earth is attracting the apple; the apple is not attracting Earth. D. The apple is attracting Earth and Earth is attracting the apple.
The charge flowing through a light bulb attached to a 12.0-V battery in 13.0 s is 30.0 C. What is the average power supplied by the battery during this process?
a. 360 W b. 12.0 W c. 27.7 W d. 5.20 W e. 30.0 W