An object has a mass of 50.0 g and a volume of 10.5 cm3. What is the object's density?
2 answers:
Answer:
Density of object, d = 4.76 g/cm³
Explanation:
It is given that,
Mass of the object, m = 50 g
Volume of the object, V = 10.5 cm³
We need to find the density of the object. The mass per unit volume of the object is called its density. It is given by :
d = 4.76 g/cm³
So, the density of the object is 4.76 g/cm³. Hence, this is the required solution.
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Answer:
1) f= 8.6 GHz
2) t= 0.2 ms
Explanation:
1)
- Since microwaves are electromagnetic waves, they move at the same speed as the light in vacuum, i.e. 3*10⁸ m/s.
- There exists a fixed relationship between the frequency (f) , the wavelength (λ) and the propagation speed in any wave, as follows:
- Replacing by the givens, and solving for f, we get:
⇒ f = 8.6 Ghz (with two significative figures)
2)
- Assuming that the microwaves travel at a constant speed in a straight line (behaving like rays) , we can apply the definition of average velocity, as follows:
where v= c= speed of light in vacuum = 3*10⁸ m/s
d= distance between mountaintops = 52 km = 52*10³ m
- Solving for t, we get:
⇒ t = 0.2 ms (with two significative figures)