At a waterpark, sleds with riders are sent along a slippery, horizontal surface by the release of a large, compressed spring. Th
e spring with a force constant 37.0 N/cm and negligible mass rests on the frictionless horizontal surface. One end is in contact with a stationary wall. A sled and rider with total mass 66.0 kg are pushed against the other end, compressing the spring 0.370 m. The sled is then released with zero initial velocity.
What is the sled's speed when the spring is still compressed 0.180 m?
What is the sled's speed when the spring is still compressed 0.180 m?
2 answers:
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Answer:
Explanation:
Initial speed of the electron, u = 0
The charge per unit area of each plate,
Separation between the plates,
An electron is released from rest, u = 0
Using equation of kinematics,
..........(1)
Acceleration of the electron in electric field, ............(2)
Electric field, ............(3)
From equation (1), (2) and (3) :
v = 10840393.1799 m/s
or
So, the electron is moving with a speed of before it reaches the positive plate. Hence, this is the required solution.
A) 8.11 m/s
For a satellite orbiting around an asteroid, the centripetal force is provided by the gravitational attraction between the satellite and the asteroid:
where
m is the satellite's mass
v is the speed
R is the radius of the asteroide
h is the altitude of the satellite
G is the gravitational constant
M is the mass of the asteroid
Solving the equation for v, we find
where:
Substituting into the formula,
B) 11.47 m/s
The escape speed of an object from the surface of a planet/asteroid is given by
where:
Substituting into the formula, we find: