Two vectors lying in the xy plane are given by the equations
and
. The value of
class="Wirisformula" align="middle" /> is
A.
B.
C.
D.
E.
Answer: C
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Fill in the blank(s) with correct word
Rotational Kinetic Energy: A solid ball of mass 1.0 kg and radius 10 cm rolls with a forward speed of 10 m/s when it comes to a hill. There is enough friction on the hill to keep the ball from slipping as it rolls up.(a) How high vertically up the hill can the ball roll before coming to rest?(b) How high vertically could the ball go if the hill were totally frictionless?(c) How is it that the ball can go higher with friction than without friction?
What will be an ideal response?
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A) the extinction of a large fraction of the world's plant and animal species in a relatively short period of time B) the extinction of large animals, such as dinosaurs C) an extinction caused by the impact of an asteroid or comet D) the extinction of any species of plant or animal that has mass
Which Lagrange points in the Earth—Moon system are stable?
A) L1 only B) L4 and L5 C) L2 and L3 D) all are stable