Elementary Particles: Which of the following particles (or groups of particles) are made up of quarks?
A. protons, neutrons, and electrons
B. electrons and neutrinos
C. photons
D. protons and neutrons
E. All particles except for photons are made up of quarks.
Answer: D
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Conduction: A glass tea kettle containing 500 g of water is on the stove. The portion of the tea kettle that is in contact with the heating element has an area of 0.090 m2 and is 1.5 mm thick. At a certain moment, the temperature of the water is 75°C, and it is rising at the rate of 3 C° per minute. What is the temperature of the outside surface of the bottom of the tea kettle? Neglect the heat capacity of the kettle, and assume that the inner surface of the kettle is at the same temperature as the water inside. The thermal conductivity of glass is 0.840 W/m ? K and the specific heat of water is 4186 J/kg ? K.
A. 39°C B. 92°C C. 120°C D. 86°C E. 77°C
The existence of asteroids is supporting evidence of the solar nebula hypothesis, in that ________.
A. the gaps in the asteroid belt are created by the same process that creates gaps in Saturn's rings B. the asteroids are probably fragments of a shattered planet C. asteroids in the inner Solar System are small and rocky, while those in the outer Solar System are larger and have atmospheres D. inner belt asteroids are richer in silicate and iron materials and contain fewer carbon-rich materials
The position of an air-track cart that is oscillating on a spring is given by x = (12.4 cm) cos[(6.35 s-1)t]. At what value of t after t = 0 s is the cart first located at x = 8.47 cm?
A) 4.34 s B) 0.108 s C) 0.129 s D) 7.39 s E) 7.75 s
A circuit consists of N resistors, all of resistance R, connected as shown below. A potential difference V is applied to the circuit. The equivalent resistance of the circuit is
a.
.
b.
