The circuit below contains 4 100-W light bulbs. The emf is 110 V. Which light bulb(s) is(are) brightest?
a.
A
b.
B
c.
C
d.
D
e.
C and D
b
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Heat is added to a 2.0 kg piece of ice at a rate of 793.0 kW. How long will it take for the ice to melt if it was initially at 0.00°C? (The latent heat of fusion for water is 334 kJ/kg and its latent heat of vaporization is 2260 kJ/kg.)
A) 0.84 s B) 530,000 s C) 4.7 s D) 670 s
In the nuclear reaction 1H + 2H ? 3He, how does the nuclear energy and the total rest-mass of the two hydrogen nuclei compare with the nuclear energy and the total rest-mass of the resulting helium nucleus?
A) Nuclear energy of helium is more, mass of helium is the same as the mass of the two hydrogen nuclei. B) Nuclear energy of helium is less, mass of helium is less. C) Nuclear energy of helium is less, mass of helium is the same as the mass of the two hydrogen nuclei. D) Nuclear energy of helium, and mass of helium, are both the same as the nuclear energy and the mass of the two hydrogen nuclei. E) Nuclear energy of helium is more, mass of helium is more.
Two projectiles are launched 50° above horizontal but with different initial speeds. Which of the following must be true while the projectiles are in the air? (Ignore air resistance.)
A. The horizontal speeds of both projectiles are the same B. The one with larger initial speed will experience a larger vertical acceleration C. The projectiles will reach the same maximum height D. The horizontal accelerations of both projectiles are the same: zero
A cylinder of radius 8.0 cm rolls 20 cm in 5.0 s without slipping. Through how many degrees does the cylinder turn during this time?
What will be an ideal response?