A car travels in a flat circle of radius R. At a certain instant the velocity of the car is 24 m/s west, and the acceleration of the car has components of 2.4 m/s2 east and 1.8 m/s2 south. What is the radius of the circle?
a. 0.24 km
b. 0.19 km
c. 0.32 km
d. 0.14 km
e. 0.27 km
C
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What is the phase angle between the voltages of the inductor and capacitor in a RLC series circuit?
A) 0° B) 45° C) 90° D) 180° E) 270°
Two tanks of gas, one of hydrogen, H2, and one of helium, He, contain equal numbers of moles of gas. The gram-molecular mass of He is twice that of H2 . Both tanks of gas are at the same temperature, 293 K. Which statement(s) below is(are) correct when we ignore vibrational motion?
a. The total internal energy of the hydrogen is the same as that of the helium. b. The total internal energy of the hydrogen is 1.4 times that of the helium. c. The total internal energy of the helium is 1.4 times that of the hydrogen. d. The total internal energy of the hydrogen is 1.67 times that of the helium. e. The total internal energy of the helium is 1.67 times that of the hydrogen.
When energy is released in a chemical reaction, the reaction is called a(n) ______________ reaction
Fill in the blank(s) with correct word
High mass stars are much less common than low mass stars because they
A) are born in much smaller numbers B) have much shorter lifetimes C) have much longer lifetimes D) two of these