A charged capacitor is connected to an ideal inductor. At time t = 0, the charge on the capacitor is equal to 6.00 ?C. At time t = 2.00 ms the charge on the capacitor is zero for the first time
What is the amplitude of the current at that same instant?
A) 2.38 mA
B) 4.71 mA
C) 0.780 mA
D) 1.53 mA
E) 1.19 mA
B
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In the figure, an airport luggage-carrying train with a tractor T is pulling three luggage carts, src="https://sciemce.com/media/4/773b8b498cf934ef13.png" class="w-image" /> and cart 
and 
with an acceleration of 1.2 
If T = 300 kg, 
= 200 kg, 
= 100 kg, and 
= 100 kg, then the force in the connection between cart 
is
A. 840 N.
B. 480 N.
C. 240 N.
D. 120 N.
E. 0 N.
Algol consist of a 3.7 MSun main-sequence star and a 0.8 MSun subgiant. Why does this seem surprising, at least at first?
A) The two stars should be the same age, so we'd expect the subgiant to be more massive than the main-sequence star. B) The two stars in a binary system should both be at the same stage of life; that is, they should either both be main-sequence stars or both be subgiants. C) It doesn't make sense to find a subgiant in a binary star system. D) A star with a mass of 3.7 MSun is too big to be a main-sequence star.
A hot air balloon has a volume of 2.00 × 103 m3 when fully inflated, and the air inside the balloon is always at atmospheric pressure of 1.01 × 105 Pa
because of the large opening used to fill the balloon and heat the air inside it. What is the mass of hot air inside the balloon if its temperature is 120°C? The universal gas constant is 8.314 J/mol•K. (Assume a molecular weight of 28.8 g/mol for air.) A) 1780 kg B) 5850 kg C) 203 kg D) 62.0 kg
A Type II supernova can form a _______________ or a black hole
a. neutron star b. red giant c. white dwarf d. planet