The resolution of a 10-meter telescope is about 0.01 arcsecond for visible light. Would you expect the angular resolution of a 10-meter radio telescope to be better than, equal to, or worse than 0.01 arcsecond? Explain
What will be an ideal response?
It would be worse than 0.01 arcsecond because radio waves have much longer wavelength than visible light, and hence poorer angular resolution for the same size telescope.
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A car travels in a due northerly direction at a speed of 55 km/h. The traces of rain on the side windows of the car make an angle of 60 degrees with respect to the horizontal. If the rain is falling vertically with respect to the earth, what is the speed of the rain with respect to the earth?
a. 48 km/h b. 95 km/h c. 58 km/h d. 32 km/h e. 80 km/h
Suppose you are using the Doppler method to look for planets around another star. What must you do?
A) Compare many spectra of the star taken over a period of many months or years. B) Compare many spectra of an orbiting planet taken over a period of many months or years. C) Compare the brightness of the star over a period of many months or years. D) Carefully examine a single spectrum of an orbiting planet. E) Carefully examine a single spectrum of the star.
A jet engine develops 2.0 × 10^5 N of thrust in moving an airplane forward at a speed of 900 km/h. What is the power developed by the engine?
a. 500 kW c. 25 MW b. 10 MW d. 50 MW
The force that propels a cannonball when fired from a cannon is
A) huge compared to the recoil force on the cannon. B) equal and opposite to the force the ball exerts on the cannon. C) in some cases, equal and opposite to the force the ball exerts on the cannon.