Two forces act on a 55-kg object. One force has magnitude 65 N directed 59° clockwise from the positive x-axis, and the other has a magnitude 35 N at 32° clockwise from the positive y-axis. What is the magnitude of this object's acceleration?
A) 1.1 m/s2
B) 1.3 m/s2
C) 1.5 m/s2
D) 1.7 m/s2
A
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Increasing the mass m of a mass-and-spring system causes what kind of change on the resonant frequency of the system?
A) The frequency increases. B) The frequency decreases. C) There is no change in the frequency. D) The frequency increases if the ratio k/m is greater than or equal to 1 and decreases if the ratio k/m is less than 1. E) The frequency increases if the ratio k/m is less than or equal to 1 and decreases if the ratio k/m is greater than 1.
How much energy is radiated each second by one square meter of a star whose temperature is 10,000 K? s in the Stefan-Boltzmann law is equal to 
,
a. 5.67 x 1012 J
b. 5.67 x 108 J
c. 5.67 x 104 J
d. 300 nm
e. 300,000,000 nm
All of the above are true. Which one explains why we see phases of the Moon.
a) As the Moon orbits the Earth, sometimes its shadow falls on the surface of the earth b) as the Moon orbits the Earth, it sometimes enter into the Earths shadow c)As the Moon orbits the Earth, it always keeps the same face pointing toward Earth
The amount of current in an incandescent bulb rated 75W-120V is about
A) 0.4 A. B) 0.6 A. C) 1.2 A. D) more than 1.2 A.