Answer:
the crown is false densty= 12556kg/m^3[/tex]
Explanation:
Hello! The first step to solve this problem is to find the mass of the crown, this is found using the weight of the crown in the air by means of the equation for the weight.
W=mg
W=weight(N)=31.4N
M=Mass
g=gravity=9.81m/S^2
solving for M
m=W/g
The second step is find the volume of crown remembering that when an object is weighed in the water the result is the subtraction between the weight of the object and the buoyant force of the water which is the product of the volume of the crown by gravity by density of water
Where
F=weight in water=28.9N
m=mass of crown=3.2kg
g=gravity=9.81m/S^2
α=density of water=1000kg/m^3
V= crown´s volume
solving for V
finally, we remember that the density is equal to the index between mass and volume
To determine the density of the crown without using the weight in the water and with a bucket we can use the following steps.
1.weigh the crown in the air and find the mass
2. put water in a cylindrical bucket and measure its height with a ruler.
3. Put the crown in the bucket and measure the new water level with a ruler.
4. Subtract the heights, and find the volume of a cylinder knowing the difference in heights and the diameter of the bucket, in order to determine the volume of the crown.
5. find density by dividing mass by volume
Answer:
hayyyyyyyyyy tomatooooooooo since Yukki dont want me talk to u on there i will talk to u on here hehehehehhehehehhehhe
Explanation:
Answer:
True. This study utilized a placebo.
Explanation:
Firstly, let's define a placebo.
A placebo is something that seems to be a "real" medicine, however, it is not. It could be a pill, a liquid or other presentations of "Non- real" treatments. When using a placebo, we can affirm that they do not have in their composition an active substance that can improve health.
In this case, we have twenty cyclists randomly selected. Half of them received the truth supplement for four weeks, all the rest received a powdered with similar properties but not physical effects. It means: Half of the cyclist received a "placebo", that seems to be "real" medicine, nevertheless the "placebo" medicine will not show effects on health by its self.
Due to the above, we can conclude that this study utilized a placebo for half of the group.
Answer:
<h2> The overall reliability of the system is 88%</h2>
Explanation:
When solving for the reliability of a complex machine, that is a machine that has more than one component, the reliability of the machine is the products of all individual components.
Given the
reliabilities of 98%,
96%, and
94%
Converting to decimals we have
98/100= 0.98
96/100= 0.96
94/100= 0.94
The product of all reliability is
0.98* 0.96 0.94= 0.88
now converting back to percent we have
0.88*100= 88%
