An ideal spring has a spring constant of 60 N/m. How much energy does it store when it is stretched by 1.0 cm?
A) 0.0030 J
B) 0.30 J
C) 60 J
D) 600 J
A
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Matter Waves: An electron is accelerated from rest through a potential difference. After acceleration the electron has a wavelength of 880 nm. What is the potential difference responsible for the acceleration of the electron? (h = 6.626 × 10-34 J ? s, melectron = 9.11 × 10-31 kg, e = 1.6 10-19 C)
A. 1.9 × 10-6 V B. 1.7 × 10-6 V C. 2.2 × 10-6 V D. 2.5 × 10-6 V
Uncertainty Principle Using Energy and Time: The energy released when an unstable electron state decays has an uncertainty of about 0.50 eV. What is the uncertainty in the life-time of the level? (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 1.3 × 10-15 s B. 8.3 × 10-15 s C. 1.3 × 10-11 s D. 8.3 × 10-11 s
A brass pipe is twisted by torques T 5 800 N # m acting at the ends causing an angle of twist of 3.58. The pipe has the following properties: L 5 2.1 m, d1 5 38 mm, and d2 5 56 mm. The shear modulus of elas-ticity G of the pipe is approximately:
(A) 36.1 GPa
(B) 37.3 GPa
(C) 38.7 GPa
(D) 40.6 GPa
The electric field between the plates of a parallel plate capacitor is inversely proportional to the plate separation
Indicate whether the statement is true or false