Which of these is an example of acceleration?
2 answers:
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<span>At where:
Q = amount of sensible heat (cal or J).
C = specific heat of the substance constituting the body (cal / g ° C or J / kg ° C).
M = body mass (g or kg).
Δθ = temperature variation (° C).
T = final temperature
To = Initial temperature
Data:
Q = 10 calories
M = 2 grams
C (ice)= 0.550 cal / g ° C
To = -30 ° C
T =?
Formula: Q = m * c * Δθ
Resolution:
Substitute
Q = m * c * Δθ
10 = 2 * 0.550 * [T-To]
10 = 1.1 * [T-(-30)]
10 = 1.1 * [T+30]
10 = 1.1T + 33
-1.1T = 33 - 10
-1.1T = 23 .(-1)
1.1T = - 23
T = </span>
T ≈ - 20.90 ° C (the final temperature of the ice)
Explanation:
(a)
Critical angle is the angle at the angle of refraction is 90°. After the critical angle, no refraction takes place.
Using Snell's law as:
Where,
is the angle of incidence
is the angle of refraction = 90°
is the refractive index of the refraction medium
is the refractive index of the incidence medium
Thus,
The formula for the calculation of critical angle is:
Where,
is the critical angle
(b)
No it cannot occur. It only occur when the light ray bends away from the normal which means that when it travels from denser to rarer medium.