At the instant a 2.0-kg particle has a velocity of 4.0 m/s in the positive x direction, a 3.0-kg particle has a velocity of 5.0 m/s in the positive y direction. What is the speed of the center of mass of the two-particle system?
a. 3.8 m/s
b. 3.4 m/s
c. 5.0 m/s
d. 4.4 m/s
e. 4.6 m/s
B
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Choose the correct statement
a. The perceived pitch of a sound usually doesn't depend on the sound's frequency. b. The frequency of each musical note is 10 Hz higher than that of the next lower note. c. The decibel is the standard measure of tone quality. d. The perceived loudness of a sound depends somewhat on frequency.
A proton and an alpha particle are moving perpendicular to a uniform magnetic field with the same speed. If the velocity of the proton is at an angle of 20° with respect to the magnetic field direction, at what angle to the magnetic field direction would the alpha particle be moving if it experiences the same magnitude acceleration as the proton? The alpha particle has 4 times the mass of the
proton and twice its charge. a. 43° c. 62° b. 10° d. 9.8°
The specific heat capacity of water is about twice the specific heat capacity of ice. From this information, the amount of heat required to boil 1 kg of water is ________ the amount of heat required to melt 1 kg of ice
a. 1/2 c. 2 times b. equal to d. unrelated to
Which one of the following capacitances in series with a 100-? resistor and 15-mH coil will give a total impedance of 110 ? at 2.0 kHz?
A) 0.56 ?F B) 0.14 mF C) 46 ?F D) 10 ?F