James Prescott Joule's experiments, such as stirring a container full of liquid, showed that
A) thermal energy is actually a form of energy.
B) the "Newtonian" energy forms [kinetic, gravitational, elastic] are conserved.
C) all forms of energy are conserved.
D) Mr. Joule did not know how to make a good batch of chili.
E) radiant energy is actually a form of energy.
A
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A worker on top of a radar tower 80 m high drops a wrench off the tower. The speed of the wrench when it hits the ground is ____________
Fill in the blank(s) with correct word
Why do scientists think tiny quantum ripples should have been present in the very early universe?
A) The shock wave of the Big Bang caused ripples that expanded outward with time. B) The energy released when the strong force froze out of the GUT force caused shock waves that produced ripples in the universe. C) Matter and antimatter particles that spontaneously formed from high-energy photons caused disruptions in the radiation field. D) The annihilation of matter and antimatter particles caused tiny explosions that disrupted the radiation field. E) Quantum mechanics tells us that the energy fields at any point in space be continually fluctuating as a result of the uncertainty principle.
The brightest stars in a young open cluster will be
A) massive blue main-sequence stars. B) Cepheid variables. C) yellow main-sequence stars like the Sun. D) T-Tauri variables. E) red giants.
To say that an object is electrically polarized is to say
A) it is electrically charged. B) its charges have been rearranged. C) its internal electric field is zero. D) it is only partially conducting. E) it is to some degree magnetic.