Your right. It's C. This question is difficult
Answer:
necessary for the growth, development and repair of all body tissues. it's involved in many body functions, including formation of collagen, absorption of iron, the proper functioning of the immune system, wound healing, and the maintenance of cartilage, bones, and teeth.
Explanation:
Answer: B.) High specific heat capacity
Explanation:
Thermal insulators are materials that are bad conductors of thermal energy.
On the other hand, the <u>specific heat capacity</u> of a material is defined as t<em>he amount of heat needed to raise the temperature of 1 kg of the material by 1K.
</em>
So:
If a material has a low specific heat capacity, it means that it takes a short time to absorb the heat, hence a temperature increase occurs shortly. These are excellent thermal conductors.
But if a material has high specific heat capacity, it will take longer to absorb heat and is therefore an excellent thermal insulator.
Answer:
3. It has the same net charge as 11 protons.
Explanation:
An electrically neutral object contains the same number of protons and electrons. Therefore, if 11 electrons are removed from it, there will be 11 more protons compared to the number of electrons in the object. Thus, the object It has the same net charge as 11 protons.
Answer:
vr = 4.336 m/s
Explanation:
We are given that;
Beat frequency is 6Hz
Speed of sound = 344 m/s
Now,
Reflective Doppler frequency; f = 235 + 6 = 241 Hz
We can calculate the observed frequency if both the source sound and the observer are moving towards each other. In this case, the formula is:
f = fo[(c + vr)/(c + vs)]
Where;
ƒ = observed frequency
c = speed of sound
vs = velocity of source (negative if it’s moving toward the observer)
ƒ0 = emitted frequency of source
Since it’s moving toward the observer, thus we can rewrite equation as;
f = fo[(c + vr)/(c - vs)]
We have that;
fo = 235 , f = 241 , c = 344 , vr=vs
Thus,
241 = 235[(344+vr)/(344-vr)]
241(344 - vr)= 235(344 + vr)
82904 - 241vr = 80840 + 235vr
82904 - 80840 = 241vr + 235vr
2064 = 476 vr
vr = 2064/476
vr = 4.336 m/s
