Answer:
The answer is
Explanation:
If the ball is thrown vertically, the equation of its position is
So setting our coordinate system in the position of throwing , the equation for A is
and for B
where
due to the delay of the throwing between A and B, "t"
.
Now, the balls passing each other means that
then
cancelling some terms...
so
Answer:
the work done is zero.
Explanation:
Given;
applied force, F = 8000 N
time of force application, t = 15 s
Work done is given as the product of force and displacement. Since the car is unable to move, then the displacement is zero and the work done is zero.
Work done = Force x displacement
Work done = 8000 N x 0
Work done = 0
Therefore, the work done is zero.
This is, I think, about heat engines and the first law of thermo ?Hot reservoir supplies heat to the system at a high temperature. System does work.System rejects some heat to a cold reservoir at a low temperature.That's a word description of a thermo block diagram. And I think it refers to the "steady state". Seems reasonable that the system would have to warm up (car engines, eg), during which process the (internal ?) energy would presumably rise. In the steady state, however, the energy will presumably be constant. If it continued to rise ... the thing would overheat ????
Answer:
The moment of inertia of the system is
Explanation:
From the question we are told that
The mass of the platform is
The radius of the platform is r = 1.95 m
The mass of the person is
The position of the person from the center is
The mass of the dog is
The position of the dog from the center is
Generally the moment of inertia of the platform with respect to its axis is mathematically represented as
The moment of inertia of the person with respect to the axis is mathematically represented as
The moment of inertia of the dog with respect to the axis is mathematically represented as
So the moment of inertia of the system about the axis is mathematically evaluated as
=>
substituting values
Answer
given,
SAT is 500 with a standard deviation of 100.
a sample of 400 students whose family income was between $70,000 and $80,000 had an average verbal SAT score of 511.
sample mean =
=
= 5
95% confidence level is achieved within +/- 1.960 standard deviations.
1.960 standard deviations x 5 is equal to +/- 9.8
confidence interval = 511 - 9.8 --- 511 + 9.8
= 501.2-----520.8