A wire that is 1.0 mm in diameter and 3.5 m long stretches 3.5 mm when an 8.0-kg tool is hung from it
(a) What is Young's modulus for the material from this wire is made?
(b) What is the effective spring constant for the stretching wire?
What will be an ideal response?
(a) 1.0 × 1011 Pa (b) 2.2 × 104 N/m
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Which of the following cannot be determined from the spectrum of a star?
a. chemical composition b. surface temperature c. radial (along line of sight) velocity d. tangential (perpendicular to line of sight) velocity e. Both c and d
A ball is rolled horizontally off a table with an initial speed of 0.18 m/s. A stopwatch measures the ball's trajectory time from table to the floor to be 0.30 s. How far away from the table does the ball land? Note: g = 9.8 m/s2 and air resistance is negligible
a. 0.054 m c. 1.2 m b. 0.072 m d. 1.9 m
Which of the following demonstrates the indeterminacy inherent in the microscopic [or atomic-level] world?
A) double slit experiment with electrons B) radioactive decay C) Both of the above. D) spontaneous creation of a positron-electron pair from a photon E) All of the above.
3 steps on the Richter scale represents about how many times more energy?
a. 32 b. 32000 c. 30000 d. 300