Resolution: Astronomers are proud of their telescopes and often say they can "resolve a dime at so many miles." How many miles from a 102-cm-diameter telescope mirror can you place a coin of diameter 3.0 cm and just resolve the coin using light of wavelength 389 nm? (1 mi = 1.609 km)
A. 19 mi
B. 9.7 mi
C. 40 mi
D. 190,000,000 mi
Answer: A
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An aluminum bar of diameter d 5 52 mm is twisted by torques T1 at the ends. The allowable shear stress is 65 MPa. The maximum permissible torque T1 is approximately:
(A) 1450 N?m
(B) 1675 N?m
(C) 1710 N?m
(D) 1800 N?m
A ventilation fan has blades 0.25 m long rotating at 20 rpm. What is the centripetal acceleration of a point on the outer tip of a blade?
a. 1.1 m/s2 b. 0.87 m/s2 c. 0.55 m/s2 d. 0.23 m/s2
Estimate the rotational energy (in eV) for a diatomic hydrogen molecule in the l = 2 quantum state
(The equilibrium separation for the H2 molecule is 0.074 nm.) (1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s, h = 1.055 × 10-34 J ? s, mH ? mproton = 1.67 × 10-27 kg) A) 0.026 eV B) 0.046 eV C) 0.055 eV D) 0.032 eV E) 0.011 eV
An oxygen atom can bond to ______________ other atom(s)
Fill in the blank(s) with correct word