Help?please
This question is physics
This question is physics
2 Answers
0.191131498.....
Explanation:
For the purpose of simplicity let the acceleration due to the gravity near the earth's surface be
To find the initial speed with which the object is launched at the INSTANT it leaves the spring,
cancelling the
The general formula for Work is W = Force * distance =
To find work done by friction, since it opposes the direction of motion of the block,
Since the block comes to rest and all the kinetic energy is converted to heat due to friction and other forms of energy,
Rewriting to solve for
Therefore
Explanation:
As the spring is compressed it has mechanical potential energy which is given by the expression
#PE=1/2 kx^2#
where#k# is spring constant and#x# is deformation of the spring.
On releasing of spring, all this energy is transferred to the block as its kinetic energy.
As the block moves on the horizontal surface, its kinetic energy is used to do work against force of friction
Now
#vecF=mu_kvecN#
where#mu_k# is coefficient of friction and#vec N# is normal reaction#=mvecg# .
Inserting various values we have
We know that work done is
In this case
#:.W = F * s#
#=>W = 19.6mu_k xx 0.60#
Since the block comes to rest this is equal to initial potential energy of the spring. Equating the two we get
#19.6mu_k xx 0.60=1/2kx^2#
Inserting given values we get