The horizontal acceleration of a projectile
a. is zero
b. stays constant
c. continuously increases
d. continuously decreases
e. sometimes decreases and sometimes increases
A
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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
Angular Quantities: At a certain instant, a compact disc is rotating at 210 rpm. What is its angular speed in rad/s?
A. 11 rad/s B. 22 rad/s C. 45 rad/s D. 69 rad/s E. 660 rad/s
A 2.15 kg lightly damped harmonic oscillator has an angular oscillation frequency of 0.261 rad/s. If the maximum displacement of occurs when t = 0.00 s, and the damping constant b is 0.74 kg/s what is the object's displacement when t = 4.01 s?
A) 0.50 m B) 0.43 m C) 0.58 m D) 0.65 m
What is true of spring tides?
A) The third quarter Moon would be high overhead at dawn. B) The difference between low and high tides would be greatest. C) There would be one high and one low tide each day. D) The Moon's phase will be first quarter. E) The difference between low and high tides would be smallest.