An astronaut at rest has a heart rate of 68 beats/min. What will her heart rate be as measured by an Earth observer when the astronaut's spaceship goes by the Earth at a speed of 0.76c?
a. 105 beats/min
b. 52 beats/min
c. 33 beats/min
d. 139 beats/min
e. 44 beats/min
e
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What is the total mass of the Earth's atmosphere? The radius of the Earth is 6.4 × 106 m, and 1 atm = 1.01 × 105 N/m2.
A. 5.3 × 1016 kg B. 1.1 × 1018 kg C. 5.3 × 1018 kg D. 1.1 × 1020 kg E. 5.3 × 109 kg
In Fizeau's experiment for measuring the speed of light, the wheel has 475 notches. What rotational speed is required for the return beam of light to pass through the next notch? The time between successive notches is 6.65 × 10-5 s
A) 20.4 rev/sec B) 16.6 rev/sec C) 31.7 rev/sec D) 66.4 rev/sec E) 90.9 rev/sec
A very light ideal spring of spring constant (force constant) 2.5 N/cm is 15 cm long when nothing is attached to it. It is now used to pull horizontally on a 12.5-kg box on a perfectly smooth horizontal floor
You observe that the box starts from rest and moves 96 cm during the first 1.6 s of its motion with constant acceleration. How long is the spring during this motion?
Rank the following kinds of waves according to their frequencies from highest to lowest:
(a) gamma rays (b) microwaves (c) radio waves (d) visible light (e) x-rays
1.c > b > d > e > a 2.b > c > e > b > a 3.a > e > d > b > c 4.e = a = c = d = b