An Olympic skier moving at 20.0 m/s down a 30.0o slope encounters a region of wet snow, of
1 answer:
Answer:
Option B
Explanation:
Forces acting on the skier-
F1 down the slope
F2
F3 = friction force
Net force, down the slope
Acceleration m/s2
Acceleration remains constant, initial speed is 20 m/s
Speed at time t is m/s
Distance down the slope at time t is
When the skier stops, her speed is 0. Thus,
, seconds
Distance travelled in 14.5 seconds (negative because it is down the slope).
Option B is correct
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Answer:
Explanation:
GIVEN
diameter = 15 fm =m
we use here energy conservation
there will be some initial kinetic energy but after collision kinetic energy will zero
on solving these equations we get kinetic energy initial
J ..............(i)
That is, the alpha particle must be fired with 35.33 MeV of kinetic energy. An alpha particle with charge q = 2 e
and gains kinetic energy K =e∆V ..........(ii)
by accelerating through a potential difference ∆V
Thus the alpha particle will
just reach the nucleus after being accelerated through a potential difference ∆V
equating (i) and second equation we get
e∆V = 35.33 Me V