Answer:
Explanation:
Solution:
- We are to develop a circuit that has an input of available battery 9.0 V and has an output potential difference of 3.0 V
- We are given:
Battery ..... 9.0 V
Resistors ... 10 Kohms
- We will develop a potential divider circuit by placing a few resistors in series and then connecting in between resistors to get our desired voltage.
- How many resistors should we use ?
We know that if we add series resistance in a circuit the current decreases proportionally. However, the potential difference across resistors also changes.
- Our desired voltage is a ratio of input battery voltage.
Input / Output = 9 / 3 = 3
We can use this ratio as the number of "Identical resistors" that can be placed in series to give us the desired voltage. Note: This would not be true if we did not had any identical resistors.
- We will place 3, 10 Kohms resistors in series.
- To verify we will calculate the potential difference across each resistor. The current of the total circuit is:
I = V / R_eq
R_eq = 3*R = 30 kohms
I = 9 / 30,000 = 0.0003 Amps
- Now the potential difference for each resistor:
V = I*R_each
V = 0.0003*(10,000)
V = 3.0 V
- We can take two leads across any 10 kohms resistor and the potential difference across the leads would be the desired voltage 3.0 V.
That depends on several things that we don't know.
A few of them are:
-- the size of the sample
-- what level of radioactivity was measured at the beginning
-- what's the unit of the 12.5
-- the half-life of the substance involved
Gamma radiation. Alpha and beta can be stopped relatively easily
Answer:
x₂ = 16 g m₂ / k
Explanation:
The spring in all cases must comply with Hooke's law
F = k x
Newton's diagram for equilibrium has
F - W = 0
k x₁ = m₁ g
k = g m₁ / x₁
When the elevator moves you have a clarification
F-W = m a
F = m (g + a)
Compression is
K x₂ =4 m (g + 3g)
x₂ = 4m / k (4g)
x₂ = 16m2 / k g
Hi there my friend :)
Your answer is C. frequency
Hope this helps :)
-xxAnsxx-
