Sgr A* emits radio waves
a. True
b. False
Indicate whether the statement is true or false
True
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In which of the following cases can we determine the precise mass and density of an extrasolar planet?
A) We have detected the planet with both the transit and Doppler methods. B) We have detected the planet with the Doppler method, but not any other method. C) We have detected the planet with the transit method, but not any other method. D) We have observed both transits and eclipses of the orbiting planet.
A 25.0-kg box is released on a 27° incline and accelerates down the incline at 0.30 m/s2 Find the friction force impeding its motion. What is the coefficient of kinetic friction?
What will be an ideal response?
A radioisotope has a half-life of ? at a temperature of 150 K. If its temperature is increased to 300 K, what will its half-life be?
A) 4? B) 2 ? C) ? D) ?/2 E) ?/4
A person is designing a telescope with a magnification of 10. If the telescope is limited to a length of 0.20 m, what is the approximate focal length of the objective?
A) 16 cm B) 17 cm C) 18 cm D) 19 cm