The natural frequency of an object depends on its
A) elasticity.
B) size and shape.
C) both of these
D) none of the above
Answer: C
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Under what conditions is an object weightless? (Ignore effects of air resistance.)
A) when it is in free-fall B) when it is on the Moon C) when it is detached from Earth's surface (such as in an airplane) D) when it is moving in at constant velocity
The type of EM radiation that has wavelength just a bit longer than that of visible light is
a. ultraviolet. b. infrared. c. x-ray. d. microwave. e. gamma ray.
The focal lengths of the objective and the eyepiece in a microscope are 0.29 cm and 2.50 cm, respectively. An object is placed at 0
30 cm from the objective lens and the image of this object is viewed with the eyepiece adjusted for minimum eyestrain (with the eye focused at the far point). The near point of the person using the microscope is 25 cm and the far point is at infinity. What is the final overall magnification of the microscope? A) -320 x B) -470 x C) -240 x D) -300 x E) -190 x
An LRC circuit has component values such that the circuit is initially at critical damping. Which of the following modifications would make the circuit underdamped?
A) decreasing the capacitance C, keeping the inductance L and the resistance R the same B) reducing both the inductance and the capacitance by half, keeping the resistance R the same C) increasing the resistance R, keeping the inductance L and the capacitance C the same D) doubling both the inductance and the capacitance, keeping the resistance R the same E) decreasing the inductance L, keeping the capacitance C and the resistance R the same