Answer:
a) Time interval between signals according to an observer on spaceship A = 1.09h
b) Time interval between signals according to an observer on spaceship B = 1.09h
c)The speed of A relative to the station to measure a time interval of 2.00h = 2.6 * 10⁸ m/s
Explanation:
a) Time interval between signals according to an observer on spaceship A
Initial time intervals for the alert signal, Δt₀ = 1.00h
The speed of spaceship A, v = 0.400c
The formula for the time interval is given by
Δt = ∆t₀ /√(1-(v/c)² )
Δt = 1 / √(1-(0.4c/c)² )
Δt = 1 / √(1-(0.4)²
Δt = 1.09 h
b) The intervals between signals according to an observer on spaceship A and B are equal because both spaceships are moving at the same speed.
Therefore, the time interval between signals according to an observer on B is Δt = 1.09 h
c) The speed of A relative to the station to measure a time interval of 2.00h
Δt = ∆t₀ /√(1-(v/c)² )
2 = 1 /√(1-(v/c)² )
√(1-(v/c)² ) = 0.5
1-(v/c)² = 0.25
0.75 = (v/c)²
v/c = 0.866
v = 0.866c
v = 0.866 * 3 * 10⁸
v = 2.6 * 10⁸ m/s
Answer:
90.6 A
Explanation:
From ohm's law,
V = IR.................... Equation 1
Where V = Voltage of the source, I = current through the person, R = Total resistance
Make I the subject of the equation,
I = V/R............... Equation 2
From the question,
R = Resistance of the appliance + Resistance of the skin
R = 2552+96 = 2648 ohms.
Given:
V = 240 V, R = 2648 Ω
Substitute into equation 2
I = 240/2648
I = 0.0906 A
I = 90.6 mA.
Hence the current through the person = 90.6 A.
Answer:
Stars create new elements in their cores bu squeezing elements together in a process called unclear fusion. First stars fuse hydrogen atoms into heluim. Helium atorm then fuse to create berylluim and so on until fusion in the star’s core has created every element up to icon.
