A distinctive feature of quarks is that they
A) are always observed singly, since they do not readily interact with other particles.
B) have zero charge.
C) have zero rest mass.
D) have fractional electric charge.
D
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What is the heat needed to heat 150 g of water from
to 
(specific heat of water = 4186 J/kg
A. 37.2 kJ B. 44.6 kJ C. 56.5 kJ D. 68.2 kJ E. 75.1 kJ
Galaxy A is 200 Mpcs from Galaxy B. Hubble's Law says that V = H0 × D. About how fast is Galaxy A receding from the perspective of Galaxy B? Use a value of 75 km/s/Mpc for Hubble's constant.
a) 75 km/s b) 75000 km/s c) 7500 km/s d) 150 km/s e) 15000 km/s
In the geometric analogy, the coordinate time difference ?t between two events in space time corresponds to
A. The north–south separation between points on a plane. B. The distance between points on a plane. C. A certain path length between points on a plane. D. The separation between the events in space time. E. Something else (specify).
A high performance aircraft is executing a tight turn at 135 m/s. The radius of the curve is 750 m. What is the aircraft's acceleration?