Define and distinguish among the terms speed, velocity, and acceleration
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Speed is the pace at which an object moves through a distance (regardless of direction).Velocity is the pace at which an object moves through a distance, including a specific direction. Acceleration is the rate at which an object's velocity changes. The distinguishing feature between speed and velocity is that speed does not include a direction, whereas velocity specifies a direction.
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We have sent several rovers to explore the surface of Mars. What is the correct order, from oldest to most recent, of these robotic explorers?
A. Viking, Sojourner, Opportunity and Spirit, Curiosity. B. Opportunity and Spirit, Viking, Sojourner, Curiosity. C. Sojourner, Viking, Opportunity and Spirit, Curiosity. D. Viking, Opportunity and Spirit, Sojourner, Curiosity.
A 10-kg mass and a 6.0-kg mass are connected by a light string over a massless, frictionless pulley. If g = 9.8 m/s2, what is the acceleration of the system when released?
a. 2.5 m/s2 c. 7.8 m/s2 b. 6.5 m/s2 d. 9.8 m/s2
A reactor with a conversion coefficient of 0.87 is a burner
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All Cepheid variables discovered so far lie in other galaxies
Indicate whether the statement is true or false