An automobile (m = 1.00 × 103 kg) is driven into a brick wall in a safety test. The bumper behaves like a spring (k = 5.00 × 106 N/m), and is observed to compress a distance of 3.16 cm as the car is brought to rest. What was the initial speed of the automobile?
What will be an ideal response?
2.23 m/s
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Which one of the choices below represents the preferred practice regarding significant figures when adding the following: 12.4 + 14 + 67.37 + 4.201?
a. 98 c. 97.97 b. 98.0 d. 97.971
A thin cylindrical shell is released from rest and rolls without slipping down an inclined ramp that makes an angle of 30° with the horizontal. How long does it take it to travel the first 3.1 m?
A) 1.4 s B) 1.1 s C) 2.1 s D) 1.6 s E) 1.8 s
Conversion of Units: If you are 5'10'' tall, what is your height in meters? (2.54 cm = 1.00 in.)
A. 1.5 m B. 1.6 m C. 1.7 m D. 1.8 m
Exclusion Principle: What is the correct ground state electron configuration of boron, which has 5 electrons?
A. 1s2 2s2 2p B. 1s2 2s2 2p3 C. 1s2 1p2 2s D. 1s2 2p2 3s E. 1s2 2p3