An automobile (m = 1.00 × 10^3 kg) is driven into a brick wall in a safety test. The bumper behaves like a spring (k = 5.00 × 10^6 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?
2.23 m/s
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Observations of young stars (as well as theory) tell us that when the Sun was young the solar wind
A) was weaker than it is today. B) was stronger than it is today. C) was about the same strength as it is today. D) was nonexistent. E) blew outward only along the Sun's poles.
The lunar highlands appear brighter than the mare, because these highlands are due to meteor impact that completely avoided the mare
Indicate whether the statement is true or false
Kinetic Energy: How much energy would be required to accelerate a 77-kg professor from rest to 90% the speed of light? (c = 3.0 × 108 m/s)
A. 1.6 × 1019 J B. 2.1 × 1019 J C. 9.0 × 1019 J D. 2.8 × 1019 J E. 3.5 × 1019 J
The greater efficiency achieved with the curved blades of a Pelton wheel is due to
A) bouncing. B) greater time of water impact. C) rotational momentum. D) divided impulse.