**Answer:**

Atoms with the same number of protons but with different electrical charges are **different ions**

**Explanation:**

Ions are defined as those atoms or molecules which carry charge

**Observation**: You saw/ observed something and you are stating that.

Inference: You are predicting something to be true. If so and so, then this will occur.

**Answer:**

The pendulum frequency is (c) the same, or very close to it

**Explanation:**

The simple pendulum corresponds to a simple harmonic movement, to reach this approximation in the expression of the force the sine of the angle (θ) approaches an angle value, this is only true for small angles, generally less than 15º

Sine (15th) = 0.2588

The angle in radians is 15º π / 180º = 0.26180.2588 / 0.2618

The difference between these two values is less than 1.2%

for smaller angle the difference is reduced more

Therefore, the period for both the 5º and 10º angles is almost the same

Answer:

a.3.87s

b.127.36m

c.18.4m

Step by step explanation:

Refer to the diagram

**Answer: 0.72 grams**

**Explanation: Mass can be extracted from the formula of density. D=M/V where D is density and V is volume. Therefore:**

**18 g/cm^3 = M(25 cm^3) --> Divide by 18g/cm^3 by 25 cm^3 to isolate mass. --> **<u>**0.72 =M **</u>** --> Now, to find out which unit you need to use for mass, just look at the density. You can see it is in g/cm^3, and cm^3 was already used for the volume. Thus, gram units are left, so that will be the unit needed, making the final answer 0.72 grams. Hope this helps :)**