Mercury has a radius of about 0.38 Earth radii and a mass of only 0.055 Earth masses. Estimate the acceleration due to gravity on Mercury.
A. 1.45 m/s2
B. 3.81 m/s2
C. 26.3 m/s2
D. 69.1 m/s2
Answer: B. 3.81 m/s2
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A platinum wire that is 1.20 m long has a radius of 0.500 mm and is fixed at both ends. In its third harmonic it vibrates at 512 Hz. The density of platinum is 21.4 × 103 kg/m3. What is the tension in the wire?
A) 4.00 kN B) 2.00 kN C) 2.82 kN D) 1.41 kN E) 1.00 kN
The synodic period of Venus is about how many Earth years?
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A 30-kg child rides on a circus Ferris wheel that takes her around a vertical circular path with a radius of 20 m every 22 s. What is the magnitude of the resultant force on the child at the highest point on this trajectory?
A. 49 N B. 0.29 kN C. 0.34 kN D. 0.25 kN E. 0.76 kN
Which of the following properties of a star can be measured directly, during a single night at the telescope?
A) parallax B) distance C) apparent brightness D) luminosity