Puck B has twice the mass of puck A. Starting from rest, both pucks are pulled the same distance across frictionless ice by stri
1 answer:
Answer:
(a) 1 : 2
(b) same
Explanation:
Let the mass of puck A is m and the mass of puck B is 2 m.
initial speed for both the pucks is same as u and the distance is same for both is s.
let the tension is T for same.
The kinetic energy is given by
(a) As the speed is same, so the kinetic energy depends on the mass.
So, kinetic energy of A : Kinetic energy of B = m : 2m = 1 : 2
(b) A the distance s same so the final velocities are also same.
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True: The mechanical energy is the sum of the kinetic energy and the potential energy of a body
Explanation:
The mechanical energy of a body is the sum of its kinetic energy and its potential energy:
E = K + U
where
K is the kinetic energy
U is the potential energy
The kinetic energy of a body is the energy possessed by a body due to its motion, and it is given by
where
m is the mass of the body
v is its speed
The potential energy of a body can have different forms; the most common one is the gravitational potential energy (GPE), which is the energy possessed by a body due to its position in a gravitational field. Near the Earth's surface, it can be calculated as
where
m is the mass of the body
g is the acceleration of gravity
h is the height of the object above the ground
When there are no frictional forces acting on a system, the total mechanical energy of a body is conserved. An example of this is a body in free fall: as the body falls down, the gravitational potential energy is converted into kinetic energy (because the height h decreases, while the speed v increases), however the total mechanical energy, E, remains constant.
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