Answer:
Electric field = 8.6364 × 10⁶ V/m
Explanation:
Given that:
The Voltage across the cell membrane = 76.0 mV
Also, 1 mV = 0.001 V
So, Voltage = 0.076 V
Given the thickness of the membrane = 8.80 nm
Also, 1 nm = 10⁻⁹ m
So, Thickness = 8.80 × 10⁻⁹ m
The expression for electric field is shown below as:
Electric field = 8.6364 × 10⁶ V/m
Answer:
C or D
cant say this will help much
The area of a square is given by:
A = s²
A is the square's area
s is the length of one of the square's sides
Let us take the derivative of both sides of the equation with respect to time t in order to determine a formula for finding the rate of change of the square's area over time:
d[A]/dt = d[s²]/dt
The chain rule says to take the derivative of s² with respect to s then multiply the result by ds/dt
dA/dt = 2s(ds/dt)
A) Given values:
s = 14m
ds/dt = 3m/s
Plug in these values and solve for dA/dt:
dA/dt = 2(14)(3)
dA/dt = 84m²/s
B) Given values:
s = 25m
ds/dt = 3m/s
Plug in these values and solve for dA/dt:
dA/dt = 2(25)(3)
dA/dt = 150m²/s
The question is incomplete. Here is the complete question.
A spring with a spring constant of 68 newtons per meter hangs from a ceiling. Whena 12-newton downward force is applied to the free end of the spring, the spring streches a total distance of
(1) 5.7m
(2) 0.59m
(3) 820m
(4) 0.18m
Answer: (4) 0.18 m
Explanation: The force necessary to compress or extend a spring by a displacement is directly proportional to that distance and the spring's constant. This relationship is stated by a principle called <u>Hooke's</u> <u>Law</u>:
k is spring constant, which shows how stiff the spring is and so, is characteristic of each spring;
x is total displacement;
The negative sign on the formula indicates the restoring force caused by the spring is in opposite direction related to the force and it is why the displacement occurs.
So, for the spring in the question above:
When a 12 N force is applied to the spring, it streches 0.18 m.