If an electron has the same de Broglie wavelength as the wavelength of a 390-nm photon in vacuum,
what is the speed of the electron? (melectron = 9.11 × 10-31 kg, c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s)
A) 2100 m/s B) 540 m/s C) 1900 m/s D) 1700m/s E) 1500 m/s
C
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If a lunar astronaut wanted to know the quantity of matter in a moon rock that he had collected would he want to know its mass or weight?Explain.
What will be an ideal response?
What is the maximum length of a metal cable that can hang vertically supported from one end of the cable?
The Young's modulus of this metal is 2.10 × 1011 N/m2, its tensile strength (the maximum tensile stress it can support without breaking) is 7.40 × 108 N/m2, and its density is 7.60 × 103 kg/m3. A) 9.94 km B) 4.22 km C) 456 km D) 1.75 km E) 24.8 km
With respect to the earth, object 1 is moving at speed 0.80 c to the right. Object 2 is moving in the same direction at speed 0.80 c with respect to object 1. How fast is object 2 moving with respect to the earth?
A) 0.64 c B) 0.98 c C) 0.16 c D) 1.6 c E) 0.80 c
Twenty milliseconds is
a. 0.00002 s b. 0.0002 s c. 0.002 s d. 0.02 s e. 20000 s