Define efficiency. Give an example
Efficiency is the ratio of the work output to the work input. Example: The work input
to a machine is 50 N m ? and the work output is 40 N m ? . The efficiency is 40 50 , or
80 percent.
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A lithium-sodium
Which statement is correct?
A. Only radial-velocity and transit methods reveal the radius of the planet. B. Only direct imaging and gravitational lensing methods reveal the mass of the planet. C. Only radial-velocity and gravitational lensing methods reveal the mass of the planet. D. Only direct imaging and transit methods reveal the radius of the planet. E. None of these choices are correct.
Mercury and the Moon do not have atmospheres because
A) their surfaces are so cold that any atmospheric gases freeze out onto their surfaces B) charged particles from the Sun have stripped away their atmospheres C) they are rotating too rapidly, causing their atmospheres to be thrown out into space D) their gravities are too weak to prevent atmospheric gases escaping into space
A ball thrown upwards reaches a maximum height and then comes back down to the original level. As the ball is going downwards the velocity and acceleration both point down
a. True b. False Indicate whether the statement is true or false