What are the standard units for luminosity?
A) watts
B) joules
C) newtons
D) kilograms
E) watts per second
A) watts
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Two satellites are placed in geosynchronous orbits, orbits with a period of 24 hours, where each satellite hovers over a spot on the Earth's equator. Satellite B has three times the mass of satellite A. What is the relationship between the magnitudes of the gravitational forces of the Earth on the two satellites?
A.
FA.B.
FA.C.
D.
E.
Projectile Motion: An athlete competing in the long jump leaves the ground with a speed of 9.14 m/s at an angle of 35° above the horizontal. How long does the athlete stay in the air, assuming no significant air resistance?
A. 0.50 s B. 0.88 s C. 1.1 s D. 2.5 s E. 0.54 s
Mass on a Spring: A 3.7-kg block on a horizontal frictionless surface is attached to an ideal spring whose force constant (spring constant) is 450 N/m. The block is pulled from its equilibrium position at x = 0.000 m to a position x = +0.080 m and is released from rest. The block then executes simple harmonic motion along the horizontal x-axis. The maximum elastic potential energy of the system is closest to
A. 1.4 J. B. 1.3 J. C. 1.6 J. D. 1.7 J. E. 1.8 J.
Explain under what conditions you would use percentage error and when you would use percentage difference. Why would you sometimes use both?