A star of the Sun's diameter, but twice as hot, must be 16X more luminous than the Sun

Indicate whether the statement is true or false


TRUE

Physics & Space Science

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Suppose you live in the United States and you see a crescent moon in your evening sky tonight. What will a friend in South America see tonight?

A) a crescent moon B) Your friend won't see the Moon tonight, because in South America, it will be visible only in the morning. C) a gibbous moon D) a first-quarter moon

Physics & Space Science

Stars form from a collapsing cloud that fragments into smaller and smaller pieces. This process takes about:

A) 10,000 years. B) 25,000 years. C) 100,000 years. D) a few million years. E) 100 million years.

Physics & Space Science

A 13000 N vehicle is to be lifted by a 25 cm diameter hydraulic piston. What force needs to be applied to a 5.0 cm diameter piston to accomplish this?

A) 260 N B) 520 N C) 2600 N D) 5200 N E) 13000 N

Physics & Space Science

The Doppler technique can be used to estimate the semimajor axis of a planet's orbit by

A) measuring the time it takes for the star's line-of-sight velocity to cycle from peak to peak, and using Newton's version of Kepler's Third law. B) measuring the speed at which the star orbits the mutual center-of-mass of the star and planet, and using Newton's theory of gravity. C) measuring the asymmetries in the velocity curve. D) measuring the amount by which the starlight is reduced when the planet transits.

Physics & Space Science