Answer:
The rate at which temperature changes is proportional to the rate at which heat is transferred.
Explanation:
The temperature of a sample changes more rapidly if heat is transferred at a high rate and less rapidly if heat is transferred at a low rate
Answer:
°C = Density of water (g/cm3)
4° = 1.0000
20° = 0.9982
40° = 0.9922
60° = 0.9832
80° = 0.9718
Answer:
b. 4.6 %
Explanation:
From the question,
E = M.A/V.R................ Equation 1
Where E = percentage Efficiency of the machine, M.A = machanical accurancy of the machine, V.R = Velocity ratio of the machine
Make V.R the subject of the equation
V.R = M.A/E
Given: M.A = 3, E = 65% = 0.65
Substitute this values into equation 2
V.R = 3/0.65
V.R = 4.6
Hence the right option is b. 4.6 $
Answer:
This is a chemical property. If iron does rust, this is a slow chemical change since rust is an iron oxide with different properties than iron metal.
Answer:
W = 83 [N] (weight)
Explanation:
We must clarify that the system is in static equilibrium, in such a way that we must perform a sum of forces on the Y-axis equal to zero, in order to determine the downward force corresponding to the weight of the child.
∑Fy = 0
![F_{1}+F_{2}-m*g=0\\18+65=m*g\\m*g = 83 [N]](https://tex.z-dn.net/?f=F_%7B1%7D%2BF_%7B2%7D-m%2Ag%3D0%5C%5C18%2B65%3Dm%2Ag%5C%5Cm%2Ag%20%3D%2083%20%5BN%5D)
And the mass can be determined as follows:
![m*g=83\\m = 83/9.81\\m=8.46[kg]](https://tex.z-dn.net/?f=m%2Ag%3D83%5C%5Cm%20%3D%2083%2F9.81%5C%5Cm%3D8.46%5Bkg%5D)
