Person X pushes twice as hard against a stationary brick wall as person Y. Which one of the following statements is correct?
1 answer:
Answer:
D) Both do zero work
Explanation:
The work done by a force is given by:
where
F is the force applied
d is the displacement
is the angle between the direction of the force and the displacement
From the formula, we notice that work is done online when the displacement is non-zero, so when the object is moving.
In this problem, the wall is stationary: this means that the displacement is zero, d = 0, so no work is done.
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In this equation x is the final position, which we take to be 0. Also the initial velocity Vo is zero. Thus the equation simplifies to
Putting in v=32m/s, a=-9.81m/s^2 gives
In this equation x is the final position, which we take to be 0. Also the initial velocity Vo is zero. Thus the equation simplifies to
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Answer : The concentration of at equilibrium will be,
Explanation : Given,
Equilibrium constant =
Initial concentration of = 0.100 M
Initial concentration of = 0.100 M
Initial concentration of = 0.00 M
The balanced equilibrium reaction is,
Initial conc. 0.1 0.1 0
At eqm. (0.1-2x) (0.1+2x) x
The expression of equilibrium constant for the reaction will be:
Now put all the values in this expression, we get :
By solving the term 'x' by quadratic equation, we get two value of 'x'.
Concentration of at equilibrium =
Therefore, the concentration of at equilibrium will be,