The nuclei of He are also known as
A) ? particles.
B) ? particles.
C) ? rays.
D) x-rays.
E) positrons.
A
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The law of universal gravitation is written F = GMm/r2. Why did we use the form F = mg when we studied projectile motion?
A. The first form is not valid for projectile motion. B. The first form does not work because it requires two masses. C. The first form is not valid near the surface of Earth. D. The second form is a good approximation to the first and much simpler to use.
The thermal pressure in an object increases when the temperature increases, but the degeneracy pressure does not
Indicate whether the statement is true or false
A person is walking outdoors on a cold day when the temperature is -20°C. Each time he breathes, he inhales 0.0050 m3 of air
He is breathing at the rate of 16 breaths per minute. At what rate does he lose heat from breathing if the air in his lungs is heated to body temperature (37°C) before it is exhaled? The specific heat of air is 1020 J/(kg?K) and the density of air is 1.29 kg/m3. A) 60 W B) 90 W C) 100 W D) 150 W E) 300 W
The sharing of two electrons by unlike atoms generally forms a(n) ______________ bond
a. ionic b. metallic c. nonpolar d. polar covalent