A projectile is fired from ground level at an angle above the horizontal on an airless planet where g = 10.0 m/s2. The initial x and y components of its velocity are 86.6 m/s and 50.0 m/s respectively
How long after firing does it take before the projectile hits the level ground? A) 5.00 seconds
B) 10.0 seconds
C) 15.0 seconds
D) 20.0 seconds
B
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Intensity: The intensity of the waves from a point source at a distance d from the source is I. What is the intensity at a distance 2d from the source?
A. 4I
B. 2I
C. I/2
D. I/4
E. I/
The use of grids for responsive web design layout ensures pages will adapt to different screen sizes.
Answer the following statement true (T) or false (F)
The redshift of the galaxies is correctly interpreted as
A) the differences in temperatures and star formation in old and young galaxies. B) a Doppler shift due to the random motions of galaxies in space. C) an aging of light as gravity weakens with time. D) space itself is expanding with time, so the photons are stretched while they travel through space. E) placing our Galaxy near the center of the Local Group.
The least energy required to produce forced vibrations in an object occurs
A) below its natural frequency. B) at its natural frequency. C) above its natural frequency. D) none of the above