Which is larger, a calorie or a joule?
a. calorie
b. joule
c. Neither—they are the same.
d. They cannot be compared since they measure different physical quantities.
a
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An X-ray telescope placed on the surface of Earth can detect X-rays that are emitted from a distant astrophysical source.
Answer the following statement true (T) or false (F)
Einstein proposed two basic principles or laws as the foundation of his special theory of relativity. One of these principles is intuitively plausible, while the other seems quite implausible or odd to our intuitions
The principle that is intuitively plausible is A) the principle of time dilation. B) the principle of inertia. C) the principle of relativity. D) the principle of the constancy of lightspeed. E) E=mc2.
A nearsighted person wears contact lenses having a power of -0.15 diopters. What is the person's uncorrected far point?
A) 1.5 m B) 3.3 m C) 6.0 m D) 6.7 m
An unfueled 1000-kg experimental rocket sled on level frictionless rails is loaded with 50 kg of propellant. It exhausts the propellant in a 20 s "burn.". If the rocket, initially at rest, moves at 160 m/s after the burn, what impulse is experienced by the rocket sled?
a. 1.1 × 10^5 kg•m/s c. 1.5 × 10^5 kg•m/s b. 1.6 × 10^5 kg•m/s d. 1.9 × 10^5 kg•m/s