Answer: Q=42.45W
Explanation:
Q=πA × ∆t/∆X, where;
Q= Rate of heat
π=coefficient of thermal conductivity
A= Area
∆t= change in temperature
∆x= change in thickness
Q= 0.023 × 1.7 × 33-(-5)/0.035
Q= 0.0391×38/0.035
Q = 1.4858/0.035
Q= 42.45w
Answer:
Lyrics C :like an open circuit at high frequencies and a short circuit at low frequencies
Explanation:
The impedance produce by the presence of an inductance in an electric circuit has a general equation Z(r) = jωl where j is the imaginay number, l is the inductor in henrios and ω is the frecuency of the curent ( ω = 2πf , f is the frecuency in hertz)
So module of the inductance directly depends on ω = 2πf then when f the frecuency increase, the value of ωl, also increase and when the value of f decrease ωl will decrease. For very high value of ω the inductance can become very very high ( even up to an open circuit ) and the opposite for very low values of frecuencies ωl could be very low (as to a short circuit
Answer:
The time it takes the stone to reach the bottom of the cliff is approximately 4.293 s
Explanation:
The given parameters are;
The height of the cliff, h = 90.4 m
The direction in which the stone is thrown = Horizontally
The speed of the stone in the horizontal direction = 10 m/s
The time, t, it takes the stone to reach the bottom of the cliff is given by the equation for free fall as follows;
h = 1/2 × g × t²
Where;
g = The acceleration due to gravity = 9.81 m/s²
Substituting the values gives;
90.4 = 1/2 × 9.81 × t²
t² = 90.4/(1/2 × 9.81) ≈ 18.43 s²
t = √18.43 ≈ 4.293 s
The time it takes the stone to reach the bottom of the cliff is t ≈ 4.293 s.