Answer:
The answer is D. Here is proof . Plz mark brainliest
Explanation:
That's right, the correct answer is
<span>A) The isotopes have a long half-life and only remain radioactive for a long time period
The half life of an isotope is the time it takes for the amount of the sample to reduce to half of its initial value. If an isotope has a long half-life, it means it takes a long time to reduce down to a significant level, so it will remain radioactive for a long time period.</span>
Answer:
39.4 g
39.4 cm³
1.09137 g/cm³
Explanation:
= Density of water = 1 g/cm³
Mass of water displaced will be the difference of the
Mass of water displaced is 39.4 g
Density is given by
So, volume of bone is 39.4 cm³
Average density of the bird is given by
The average density is 1.09137 g/cm³
Answer:
Explanation:
mass of linebacker, m = 111 kg
initial velocity, u = 1.9 m/s
mass of quarterback, m' = 82 kg
initial velocity, u' = 3 m/s
(a) Let they are moving in the same direction, the velocity is v after collision.
Use conservation of momentum
m u + m' u' = (m + m') v
111 x 1.9 + 82 x 3 = (111 + 82) v
v = 2.4 m/s
Let they are moving in opposite direction, the velocity is v after collision.
Use conservation of momentum
m u - m' u' = (m + m') v
111 x 1.9 - 82 x 3 = (111 + 82) v
v = - 0.18 m/s
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.
