Homework Statement
A) a horizontal disc of diameter 12.0cm is spinning freely about a vertical axis through its centre at an angular speed of 72 revolutions per minute. a piece of putty of mass 5.0g drops onto and sticks to the disc at a distance of 4.0cm from the centre. The angular speed...
not sure now. thought i was doing ok! do i work out the magnitude of the force like the following or am i off the mark?!
F = Kx
F = 30.1 kg m2 s-2 x 0.012 m
F = 0.36 N (is N supposed to be in joules?)
or do i use the 0.5kx-2 equation.
To calculate the speed with which the toy leaves the table i will have used the following equation:
E = ½ m v2
Re-arranged to give:
V =√ E / 0.5 x m
V =√ 0.36 N / 0.5 x (6.5 x 10-4)
V = 33.3 m s-1
So the speed is 33.3 m s-1
This seems quite fast!?
everything......!
its about a small toy attached to a spring with a suction device on the bottom.
the total compression of the spring is 1.2 cm
when the toy pops off the device it reaches a maximum height of 34 cm
the mass of the toy is 0.65g
the spring is ideal and air resistance and...
predicting motion course, struggling abit. i even worked out the spring constant on the question before. now its asking me to work out the speed which means combining equations at a guess. its an open university course, so a lot of reading involved which doesn't suit me really. As soon as...
Homework Statement
A bullet of mass m is fired into a large block of wood, mass M, suspended by two long cords. The bullet comes to rest in the block so that the system swings upwards, coming to rest after traveling through a vertical distance h.
Find in terms of m, M, and h:
the initial...