An object of mass m is held at a vertical height h from ground level. It is then released and falls under the influence of gravity. Which of the following statements is true in this situation? (Neglect air resistance.)
A)
The total energy of the object is decreasing.
B)
The kinetic energy of the object is decreasing.
C)
The potential energy of the object is increasing.
D)
The total energy of the object is increasing.
E)
The potential energy of the object is decreasing and the kinetic energy is increasing.
E
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A high power line carries a current of 1.0 kA. What is the strength of the magnetic field this line produces at the ground, 10 m away? (?0 = 4? × 10-7 T ? m/A)
A) 4.7 µT B) 20 µT C) 6.4 µT D) 56 µT
Based on all we know about the terrestrial worlds, what single factor appears to play the most important role in a terrestrial planet's geological destiny?
A) its size B) its composition C) its distance from the Sun D) whether or not it has liquid water
The nuclide at the top of the "relative stability of nucleus versus mass number" curve is
a. iron-56. b. uranium-235. c. uranium-238. d. helium-4.
A proton moving at 3 × 10^4 m/s is projected at an angle of 30° above a horizontal plane. If an electric field of 400 N/C is directed downwards, how long does it take the proton to return to the horizontal plane? (HINT: Ignore gravity.) [mProton = 1.67 × 10^?27 kg, qProton = +1.6 × 10^?19 C.]