Projectile Motion: A projectile is fired from ground level with a speed of 150 m/s at an angle 30° above the horizontal on an airless planet where g = 10.0 m/s2. What is the horizontal component of its velocity after 4.0 s?
A. 150 m/s
B. 35 m/s
C. 130 m/s
D. 75 m/s
E. 38 m/s
Answer: C
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What is the result when gas clouds from both of the colliding galaxies meet?
A: The clouds, being very diffuse, pass through each other just like stars pass by each other without interacting. B: The clouds crushing down on each other starts a burst of new star formation. C: They smash each other into bits and end up spread out in many directions. D: Huge, galaxy-spanning lightning bolts strike out from their collision, destroying many nearby stars. E: They collect into one big cloud but nothing else happens.
A point charge (5.0 pC) is located at the center of a spherical surface (radius = 2.0 cm), and a charge of 3.0 pC is spread uniformly upon this surface. Determine the magnitude of the electric field 1.0 cm from the point charge.
A. 0.72 kN/C B. 0.45 kN/C C. 0.63 kN/C D. 0.90 kN/C E. 0.18 kN/C
A message from relativity theory is that slowing the aging process
A) can occur with correct applications of physics. B) would occur if you fell into a bottomless mine shaft. C) can only happen to "the other guy."
Mercury's core is unusually ________, which may help explain its magnetic field
Fill in the blank(s) with correct word