The tensile strength (the maximum tensile stress it can support without breaking) for a certain steel wire is 3000 MN/m2. What is the maximum load that can be applied to a wire with a diameter of 3.0 mm made of this steel without breaking the wire?
A) 64 kN
B) 9.0 kN
C) 42 kN
D) 85 kN
E) 21 kN
Answer: E
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You may have heard it said that all objects, even ones at the temperature of our bodies, are continually emitting electromagnetic radiation. Is this true?
A) Yes, and the radiation referred to results from the trace amounts of radioactive material that have accumulated in our bodies from the food we eat. B) Yes, and the radiation from our bodies is mostly in the infrared region of the spectrum, and hence not detected by our eyes. C) Yes, and this radiation is mostly in the form of radio waves, which is a common source of static often heard on an AM radio. D) No, this is not true. If a person were emitting electromagnetic radiation, he could be seen glowing in the dark, and this is obviously not the case for most people.
A motor drives a shaft with diameter d 5 46 mm at f 5 5.25 Hz and delivers P 5 25 kW of power. The maximum shear stress in the shaft is approximately:
(A) 32 MPa
(B) 40 MPa
(C) 83 MPa
(D) 91 MPa
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A person of mass 50 kg has a de Broglie wavelength of 4.4 × 10-36 m while jogging. How fast is she running? (h = 6.626 × 10-34 J ? s)
A) 2.0 m/s B) 3.0 m/s C) 4.0 m/s D) 5.0 m/s