Answer:
Explanation:
Potential energy at the surface
= -GMm / R
= -6.6 x 10⁻¹¹ x 6 x 10²³ m / 3400 x 10³
= -1.1647 x 10⁷ m
If v be required velocity
Total energy at surface
= 1/2 m v² -1.1647 x 10⁷ m
= energy at farr off = 1/2 m x 3000²
1/2 m v² - -1.1647 x 10⁷ m = 1/2 m x 9 x 10⁶
1/2 v²= 1.1647 x 10⁷ + .45 x 10⁷
= 1.6147 x 10⁷
v² = 2.3303 x 10⁷
v = 4.827 x 10³ m / s
b ) For final speed zero at infinity
1/2 m v² - -1.1647 x 10⁷ m = 0
1/2 v² = 1.1647 x 10⁷
v² = 2.3294 x 10⁷
v = 4.826 x 10³ m /s
Answer: The answer is B: Convection
Explanation: Convection transfers heat through a movement of fluids but in this case its through air hope this helps :)
Answer:
The current in the circuit at a time interval of τ seconds after the switch has been closed is 0.123 A
Explanation:
The time constant for an R and C in series circuit is given by τ = RC.
R = 3000 ohms, C = 0.5 × 10⁻⁶ F = 5.0 × 10⁻⁷ F
τ = 3000 × 5 × 10⁻⁷ = 0.015 s
The voltage across a capacitor as it charges is given be
V(t) = Vs (1 - e⁻ᵏᵗ)
where k = 1/τ
At the point when t = τ, the expassion becomes
V(t = τ) = 1000 (1 - e⁻¹) = 0.632 × 1000 = 632 V
Current flows as a result of potential difference,.
Current in the circuit at this time t = τ is given by
I = (Vs - Vc)/R
Vs = source voltage = 1000 V
Vc = Voltage across the capacitor = 632 V
R = 3000 ohms
I = (1000 - 632)/3000 = 0.123 A
Explanation:
Dark Energy. Dark Energy is a hypothetical form of energy that exerts a negative, repulsive pressure, behaving like the opposite of gravity. It has been hypothesised to account for the observational properties of distant type Ia supernovae, which show the universe going through an accelerated period of expansion
The correct options are:
1 How tall are you?
2How far is it from your house to your school?
3How wide is your refrigerator?
All these measurements involve to measure a length. Instead, the other two options involve to measure different physical quantities; for instance, the question
4 How much does your sister weigh?
Involve to measure a weight (and so, a mass), while the question
5 How warm is it in San Diego?
requires to measure a temperature.
