You can look at magnesium, it can react with oxygen to form oxides. (chemical) it is malleable and a solid at room temperature. (physical)
to measure its density, the mass and volume can be worked out and from this density too. look up the equation, it is quite easy :)
physical changes -- it can be melted, and oxidized <span />
Answer:
The probability of higher energy state is 0.4200.
Explanation:
Given that,
Temperature = 247 K
Energy difference between two states 
We need to calculate the probability of higher energy state
Probability of 
Probability of 
The total probability is
Here, E₁ = lower energy state
E₂ = higher energy state
Put the value of E₁ in to the formula
Here, 
Put the value into the formula
Hence, The probability of higher energy state is 0.4200.
Answer:
d. The magnitude of the work done by the earth on the satellite is non zero
Explanation:
The work done is equal to the product of the force and the distance moved in the direction of the force, the force and the distance act perpendicular to one another, therefore no work is done in the circular motion of the movement of the earth.
Answer:
The Answer is A "To think of different materials to test"
Explanation:
<em>APE X</em>
