An object of mass 10.0 kg is released from the top of an inclined plane which makes an angle of inclination of 30.0° with the horizontal. The object slides along the inclined plane
The questions refer to the instant when the object has traveled through a distance of 2.00 m measured along the slope. The coefficient of kinetic friction between the mass and the surface is 0.200. Use g = 10 m/s2. How much work is done by gravity? A) 100 J
B) 20.0 J
C) 0 J
D) 10.0 J
E) 131 J
A
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The force that causes Earth to orbit the Sun is due to gravity, while the force needed to keep Earth moving as it circles the Sun is
A) inertia. B) due to gravity. C) due to both inertia and gravity. D) no force at all.
A straight wire of length L carries a current I in the positive z direction in a region where the magnetic field is uniform and specified by Bx = 3B, By = ?2B, and Bz = B, where B is a constant. What is the magnitude of the magnetic force on the wire?
a. 3.2 ILB b. 5.0 ILB c. 4.2 ILB d. 3.6 ILB e. 1.0 ILB
A satellite coasting at constant speed in a circular orbit
A) is beyond the pull of Earth's gravity B) is nevertheless accelerating. C) undergoes changes in its potential energy. D) none of the above
Which kind of telescope and which instrument or technique are shown?
a. optical, CCD
b. infrared, array detector
c. optical, adaptive optics
d. radio, interferometry