Answer:
Explanation:
heat lost by coffee = heat gain by aluminum spoon
heat lost by coffee = mc ( 85° C - T)
175 ml of water = 175 grams
175 grams = (175 / 1000) kg = 0.175 kg
heat loss by coffee = 0.175 × 4182 J/Kgk ( 85 - T) = 731.85 ( 85-T) = 62207.25 - 731.85 T
heat gain by aluminum spoon = 0.012kg × 897 J/kgK ( T - 22) = 10.764 T - 236.808
10.764 T - 236.808 = 62207.25 - 731.85 T
10.764 T + 731.85 T = 62207.25 + 236.808
T = 84.086 ° C approx 84°C
Answer:
c
Explanation:
ur changing the way it move not to make it easier
Answer:
c
Explanation:
because whatever elements are used like gas uses water evaporation so yeah
Answer:
The extension of the wire is 0.362 mm.
Explanation:
Given;
mass of the object, m = 4.0 kg
length of the aluminum wire, L = 2.0 m
diameter of the wire, d = 2.0 mm
radius of the wire, r = d/2 = 1.0 mm = 0.001 m
The area of the wire is given by;
A = πr²
A = π(0.001)² = 3.142 x 10⁻⁶ m²
The downward force of the object on the wire is given by;
F = mg
F = 4 x 9.8 = 39.2 N
The Young's modulus of aluminum is given by;
![Y = \frac{stress}{strain}\\\\Y = \frac{F/A}{e/L}\\\\Y = \frac{FL}{Ae} \\\\e = \frac{FL}{AY}](https://tex.z-dn.net/?f=Y%20%3D%20%5Cfrac%7Bstress%7D%7Bstrain%7D%5C%5C%5C%5CY%20%3D%20%5Cfrac%7BF%2FA%7D%7Be%2FL%7D%5C%5C%5C%5CY%20%3D%20%5Cfrac%7BFL%7D%7BAe%7D%20%5C%5C%5C%5Ce%20%3D%20%5Cfrac%7BFL%7D%7BAY%7D)
Where;
Young's modulus of elasticity of aluminum = 69 x 10⁹ N/m²
![e = \frac{FL}{AY} \\\\e = \frac{(39.2)(2)}{(3.142*10^{-6})(69*10^9)} \\\\e = 0.000362 \ m\\\\e = 0.362 \ mm](https://tex.z-dn.net/?f=e%20%3D%20%5Cfrac%7BFL%7D%7BAY%7D%20%5C%5C%5C%5Ce%20%3D%20%5Cfrac%7B%2839.2%29%282%29%7D%7B%283.142%2A10%5E%7B-6%7D%29%2869%2A10%5E9%29%7D%20%5C%5C%5C%5Ce%20%3D%200.000362%20%5C%20m%5C%5C%5C%5Ce%20%3D%200.362%20%5C%20mm)
Therefore, the extension of the wire is 0.362 mm.
Answer:
As an object moves in a circle, it is constantly changing its direction. ... Accelerating objects are objects which are changing their velocity - either the speed (i.e., magnitude of the velocity vector) or the direction. An object undergoing uniform circular motion is moving with a constant speed.