ALWAYS use significant figure rules. Remember that these rules apply to all numbers that are measurements.
2 answers:
Answer:
3.8 x 10¹⁷ in
Explanation:
Light speed= 982,080,000 ft/s
year(time)= 32,000,000 seconds
converting ft/s to in/s for the speed of light:
1ft/s = 12 in/s
982,080,000 ft/s x 12in/s = 11,784,960,000 in/s ( speed of light in inches)
using the standard formula for speed:
V=
Distance( inches)= V (speed in/s) x Time (seconds)
Distance = 11,784,960,000 x 32,000,000
Distance≅ 3.8 x 10¹⁷ in
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Answer:
Explanation:
plate separation = 2.3 x 10⁻³ m
capacity C₁ = ε A / d
= ε A / 2.3 x 10⁻³
C₂ = ε A / 1.15 x 10⁻³
=
a ) when charge remains constant
energy =
q is charge and C is capacity
energy stored initially E₁=
energy stored finally E₂ =
=
=
=
= 4.19 J
b )
In this case potential diff remains constant
energy of capacitor = 1/2 C V²
energy is proportional to capacity as V is constant .
= 16.76 .
Answer:
9.0 m/s
Explanation:
The problem can be solved by using the following suvat equation:
where
v is the final velocity
u is the initial velocity
is the acceleration of gravity
t is the time
When the ball reaches the maximum height, the velocity becomes zero. If we consider this as initial point of the motion, we can write
u = 0
The time it takes for the ball to go down from the maximum heigth to the ground is half the total time, so
And solving the formula for v, we find the final velocity:
So, the final speed is 9.0 m/s.
Answer:
8, 8 W
Explanation:
The useful power of 1 Light Emitting Diode is
Total power required is 1.6 W
Number of Light Emitting Diodes would be
The number of Light Emitting Diodes is 8.
Power would be
The power that is required to run the Light Emitting Diodes is 8 W