A block of ice slides freely [no air resistance, no friction] down a slippery slope
The block starts from rest at the top of the slope, where it has a vertical height of 4 m above the bottom of the slope and where it has a gravitational energy of 1000 J. The block's total energy a quarter of the way down the slope [at a height of 3 m] is
A) 250 J.
B) 500 J.
C) 750 J.
D) 1000 J.
E) greater than 1000 J.
D
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As the ball is going downwards
a. the velocity and acceleration both point up b. the velocity points up and the acceleration down c. the velocity points down and the acceleration up d. the velocity and acceleration both point down e. the acceleration is zero
The buoyant force that keeps a ship afloat is an example of
a. Archimedes' principle. b. Pascal's principle. c. Bernoulli's principle. d. Torricelli's principle. e. none of these principles.
Temperature inversions involve a higher temperature at ground level than in the air over the ground
What will be an ideal response?
The electric flux through the two adjacent spherical surfaces shown below is known to be the same
It is also known that there is no charge inside either spherical surface. We can conclude that
a.
there is no electric field present in this region of space.
b.
there is a constant E field present in this region of space.
c.
the electric flux has a constant value of zero.
d.
any of the above may be correct.
e.
only (a) and (b) above may be correct.