Answer:
let us use the expression v = ./2gS in both the cases.
a) In the first case g = 9.8 m/s^2 and S = 10.3 m.
So v = 14.21 m/s
b) in the second case, g = 1.64 m/s^2 and S = 4.2 m = 3.71 m/s
00
Explanation:
M=400/1000=0.4kg h=17.3 g=9.8m/s2 P.E=mgh P.E=0.4(9.8)(17.3) P.E=67.8J
Answer:
Explanation:
Mass of a hockey puck, m = 0.17 kg
Force exerted by the hockey puck, F' = 35 N
The force of friction, f = 2.7 N
We need to find the acceleration of the hockey puck.
Net force, F=F'-f
F=35-2.7
F=32.3 N
Now, using second law of motion,
F = ma
a is the acceleration of the hockey puck
So, the acceleration of the hockey puck is .
Answer: Bases are slippery.
Explanation:
Bases and acids can be determined by the amount of hydrogen or hydroxide ions in each solution. If a solution has more hydrogen ions than hydroxide ions, it is acidic, whereas if it has more hydroxide ions than hydrogen ions, it is basic.
Using a litmus paper test for a acidic/basic solution, the paper will turn different colors. In an acidic solution, paper will turn red, but in a basic solution, paper will turn blue.
Bases, compared to acids, feel slippery on the skin because they interact with fatty acids on the skin. Comparatively, acids feel sticky.
Acids taste sour. Think of an acid like lemon juice, compared to bases, which taste bitter (blood, for example)
A heat engine has three components namely the heat source, the heat sink and the object where the work is done. Heat engines are used to convert heat to work. <span>A 100% percent efficiency means all heat energy is converted into work energy. This means there is no heat lost to the heat sink. So, in this situation, the temperature should still stay the same. However, this cannot be done. A heat lost is needed in order for the heat engine to keep running continuously. Thus, in reality, a 100% efficiency is impossible.</span>