Total mechanical energy of a system is conserved when there are no ________ forces doing work on the system.
What will be an ideal response?
non-conservative
non conservative
frictional
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What are the most common elements composing Earth?
A. oxygen and silicon B. carbon and nitrogen C. hydrogen and helium D. uranium and plutonium
In the Doppler effect for electromagnetic waves, which of the following gives the greatest shift in frequency?
a. the source moving toward the non-moving observer at speed v b. the observer moving toward the non-moving source at speed v c. the source moving toward the approaching observer, both at speed v/2 d. All of the above give the same shift.
Patches of cooler material on the Sun's surface are called
a. flares. b. prominences. c. cool spots. d. sunspots.
A particle (mass = 5.0 g, charge = 40 mC) moves in a region of space where the electric field is uniform and is given by Ex = ?2.3 N/C, Ey = Ez = 0 . If the position and velocity of the particle at t = 0 are given by x = y = z = 0 and vz = 20 m/s, vx = vy = 0, what is the distance from the origin to the particle at t = 2.0 s?
a. 60 m b. 54 m c. 69 m d. 78 m e. 3.2 m