An object is placed at 0 on a line. It moves 3 units to the rights then 4 to the left and then 6 units to the rigth.the displace
1 answer:
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Answer:
Approximately (assuming that the acceleration due to gravity is
.)
Explanation:
Let denote the first piston's contact area with the fluid. Let
denote the second piston's contact area with the fluid.
Similarly, let and
denote the size of the force on the two pistons. Since the person is placing all her weight on the first piston:
.
Since both pistons fit into cylinders, the two contact surfaces must be circles. Keep in mind that the area of a square is equal to times its radius, squared:
.
.
By Pascal's Law, the pressure on the two pistons should be the same. Pressure is the size of normal force per unit area:
.
For the pressures on the two pistons to match:
.
,
, and
have all been found. The question is asking for
. Rearrange this equation to obtain:
.
Evaluate this expression to obtain the value of , which represents the force on the piston with the larger diameter:
.
Answer:
0.98 [sec].
Explanation:
1) the time when the player is moving up equals the time the player falls, it can be 't'. Then
2) the equation of moving down can be written as
g=10 [m/s²], t - time, h - the given height.
3) according to the formula above the time spent to moving down is:
4) finally, the total time is t*2=0.98[sec].