Three forces are exerted on an object and as a result the object moves with a constant velocity.One force is 60 N along the +x-axis, the second is 75 N along a direction making a counterclockwise angle of 150° with the +x-axis
(a) What is the magnitude of the third force? (b) What is the direction of the third force, measured clockwise from the +x-axis?
(a) 38 N (b) 260°
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Suppose XL > XC. If switch A is closed in the figure below, what happens to the phase angle?
A projectile is launched from the surface of a planet (mass = m, radius = r). What minimum launch speed is required if the projectile is to rise to a height of 2r above the surface of the planet? Disregard any dissipative effects of the atmosphere.
A.
B.
C.
D.
E.
A helium-filled balloon has a volume of 1 m3. As it rises in the earth's atmosphere, its volume expands. What will its new volume be (in m3) if its original temperature and pressure are 20°C and 1 atm, and its final temperature and pressure are ?40°C and 0.1 atm?
A. 4 B. 6 C. 8 D. 10 E. 1.5