A student wants to establish a standing wave on a wire 1.8 m long clamped at both ends. The wave speed is 540 m/s. What is the minimum frequency she should apply to set up standing waves?
What will be an ideal response?
150 Hz
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The Sun projects charged particles into space, giving rise to a flow of radiation called the
a. heliosphere. b. solar wind. c. corona. d. chromosphere.
A transformer is used to step up the voltage to a power line. If the stepped-up voltage is 10 times the original value, by how much will the power loss in the line decrease?
a. more than 95% b. between 10% and 20% c. between 20% and 95% d. There will be no change since the power into a transformer equals the power out.
What is the rotational inertia (moment of inertia) of a 12-kg uniform rod, 0.30 m long, rotating about an axis perpendicular to the rod and passing through the center of the rod?
A) 0.27 kg?m2 B) 0.18 kg?m2 C) 0.090 kg?m2 D) 0.54 kg?m2 E) 0.36 kg?m2
Refracting telescopes use a mirror to gather and focus light
a. True b. False Indicate whether the statement is true or false