Answer:
True
Explanation:
The image produced a convex mirror is always virtual irrespective of location. The size of the image is always smaller than the object. In a plane mirror the distance of the object and the distance of the image is same. But in a convex the image distance is always less than the object distance.
So, this statement is true.
B. only its velocity should change
Answer:
a = 0.7267
, acceleration is positive therefore the speed is increasing
Explanation:
The definition of acceleration is
a = dv / dt
they give us the function of speed
v = - (t-1) sin (t² / 2)
a = - sin (t²/2) - (t-1) cos (t²/2) 2t / 2
a = - sin (t²/2) - t (t-1) cos (t²/2)
the acceleration for t = 4 s
a = - sin (4²/2) - 4 (4-1) cos (4²/2)
a = -sin 8 - 12 cos 8
remember that the angles are in radians
a = 0.7267
the problem does not indicate the units, but to be correct they must be m/s²
We see that the acceleration is positive therefore the speed is increasing
Answer:
The value of the inductance is 1.364 mH.
Explanation:
Given;
amplitude current, I₀ = 200 mA = 0.2 A
amplitude voltage, V₀ = 2.4 V
frequency of the wave, f = 1400 Hz
The inductive reactance is calculated;
![X_l = \frac{V_o}{I_o} \\\\X_l = \frac{2.4}{0.2} \\\\X_l =12 \ ohms](https://tex.z-dn.net/?f=X_l%20%3D%20%5Cfrac%7BV_o%7D%7BI_o%7D%20%5C%5C%5C%5CX_l%20%3D%20%5Cfrac%7B2.4%7D%7B0.2%7D%20%5C%5C%5C%5CX_l%20%3D12%20%5C%20ohms)
The inductive reactance is calculated as;
![X_l = \omega L\\\\X_l = 2\pi fL\\\\L = \frac{X_l}{2 \pi f}](https://tex.z-dn.net/?f=X_l%20%3D%20%5Comega%20L%5C%5C%5C%5CX_l%20%3D%202%5Cpi%20fL%5C%5C%5C%5CL%20%3D%20%5Cfrac%7BX_l%7D%7B2%20%5Cpi%20f%7D)
where;
L is the inductance
![L = \frac{12}{2 \pi \times \ 1400} \\\\L = 1.364 \times \ 10^{-3} \ H\\\\L = 1.364 \ mH](https://tex.z-dn.net/?f=L%20%3D%20%5Cfrac%7B12%7D%7B2%20%5Cpi%20%5Ctimes%20%5C%201400%7D%20%5C%5C%5C%5CL%20%3D%201.364%20%5Ctimes%20%5C%2010%5E%7B-3%7D%20%5C%20H%5C%5C%5C%5CL%20%3D%201.364%20%5C%20mH)
Therefore, the value of the inductance is 1.364 mH.
I would say clay, because its a solid