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microwave13016
20.07.2019 •
Physics
A50.0-g object connected to a spring with a force constant of 35.0 n/m oscillates with an amplitude of 4.00 cm on a frictionless, horizontal surface. find (a) the total energy of the system and (b) the speed of the object when its position is 1.00 cm. find (c) the kinetic energy and (d) the potential energy when its position is 3.00 cm
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Ответ:
where
m is the mass
v is the speed
k is the spring constant
x is the elongation/compression of the spring
The total energy is conserved, so we can calculate its value at any point of the motion. If we take the point of maximum displacement:
then the velocity of the system is zero, so the total energy is just potential energy, and it is equal to
b) When the position of the object is
the potential energy of the system is
and so the kinetic energy is
since the mass is
we can re-arrange the formula to find the speed of the object:
c) The potential energy when the object is at
is
Therefore the kinetic energy is
d) We already found the potential energy at point c, and it is given by
Ответ:
Digital thermometers.
Electronic ear thermometers.
Forehead thermometers.
Explanation: