A floating object displaces its own
1) volume,
2) weight,
3) density,
and a submerged object displaces its own
4) volume.
5) weight.
6) density.
Answer: 2, 4
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Why do we expect WIMPs to be distributed throughout galactic halos, rather than settled into the galaxy's disk?
A) WIMPs are light enough that they have expanded out into the halo. B) Shock waves from generations of supernovae have blown the WIMPs out into the halo. C) WIMPs annihilate when they come into contact with ordinary matter, such as stars. D) WIMPS cannot produce photons, therefore they rarely interact and exchange energy with other particles. E) WIMPs were produced in the early stages of galaxy evolution, and objects in the halo, such as globular clusters, were formed first.
If a net force accelerates a 4.5-kg tool at 40 m/s2, what acceleration would that same net force give to an 18-kg tool?
A) 180 m/s2 B) 10 m/s2 C) 160 m/s2 D) 9.8 m/s2 E) 32 m/s2
In chemistry, reduction occurs when a substance
A) accepts electrons B) loses electrons C) rearranges its electrons internally D) breaks into its constituent atoms
Particle A (mass = m, charge = Q) and B (mass = m, charge = 5 Q) are released from rest with the distance between them equal to 1.0 m. If Q = 12 ?C, what is the kinetic energy of particle B at the instant when the particles are 3.0 m apart?
A. 8.6 J B. 3.8 J C. 6.0 J D. 2.2 J E. 4.3 J