A crane lifts a 425 kg steel beam vertically a distance of How much work does the crane do on the beam if the beam accelerates upward at 1.8 m/s2? Neglect frictional forces
A) 5.8 × 105 J
B) 3.4 × 105 J
C) 4.0 × 105 J
D) 4.9 × 105 J
Answer: A
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A certain electromagnetic field traveling in vacuum has a maximum electric field of 1200 V/m. What is the maximum magnetic field of this wave? (c = 3.0 × 108 m/s)
A) 8.7 × 10-6 T B) 3.4 × 10-4 T C) 2.2 × 10-5 T D) 4.0 × 10-6 T E) 9.6 × 10-6 T
Hydrogen has absorption lines at 656 nm and 486 nm. Where are the emission lines from hydrogen in this part of the electromagnetic spectrum?
A. 656 nm and 486 nm B. 826 nm and 656 nm C. 571 nm and 401 nm D. 486 nm and 316 nm
An X-ray telescope placed on the surface of Earth can detect X-rays that are emitted from a distant astrophysical source.
Answer the following statement true (T) or false (F)
The purpose of the third prong on a common electric plug of an appliance is
A) to handle three-phase electricity. B) to provide an alternate live wire. C) to connect the appliance to zero ground potential. D) a substitute for a safety fuse. E) all of the above