Answer:
True
Explanation:
When a ray travelling parallel to the principle axis of a concave mirror then the light ray reflect out through the mirrors and passing through the focus.
When a light ray travelling through focus of a concave mirror then after reflection the light ray reflect out through the mirror and go parallel to principle axis.
Therefore, rays travelling parallel to the principle axis of a concave mirror will reflect out through the mirrors focus.
It is true.
Answer:
9.67 kg
Explanation:
If the gauge pressure is 43 atm, the absolute pressure is 44 atm
p1 = 44 atm = 4.46 MPa
If the gauge pressure is 29.4 atm, the absolute pressure is 30.4 atm
p2 = 30.4 atm = 3.08 MPa
The ideal gas state equation is
p * V = m * R * T
We can set two eqaution for these two times
p1* V1 = m1 * R * T1
p2* V2 = m2 * R * T2
SInce V1 = V2 and T1 = T2
p1 = m1 * R
p2 = m2 * R
Rearranging
R = p1 / m1
R = p2 / m2
Equating:
p1 / m1 = p2 / m2
m2 = m1 * p2 / p1
m2 = 14 * 3.08 / 4.46 = 9.67 kg
Answer/Explanation:
The mechanical energy is 200 joules. Mechanical energy is determined by adding the total kinetic energy by the total potential energy.
M = kp
100 + 100 = 200
Answer:
C. It is converted into another form, mainly kinetic energy
Explanation:
Potential energy is energy available to be used in an object that isn't currently moving. When an object begins moving, potential energy becomes kinetic energy.
Answer:
x = A cos wt
Explanation:
To determine the position we are going to solve Newton's second law
F = m a
Spring complies with Hooke's law
F = -k x
And the acceleration of defined by
a = d²x / dt²
We substitute
- k x = m d²x / dt²
dx² / dt² + k/m x = 0
Let's call
w² = k / m
The solution to this type of differential equation is
x = A cos (wt + Ф)
Where A is the initial block displacement and the phase angle fi is determined by or some other initial condition.
In this case the body is released so that at the initial speed it is zero
From which we derive this expression
v = dx / dt = a w sin ( wt + Ф)
As the System is released for t = 0 the speed is v = 0
v = sin Ф = 0
Therefore Ф = 0
And the equation of motion is
x = A cos wt
