Answer:
A change is said be chemical change when a change in chemical property of a substance occurs and the new substance is chemically different from old one. A change is said to be physical change when only physical properties change but chemically the substances remain same.
a) adding sugar to lemonade- It is a physical change because sugar is being dissolves in the lemonade. There is no change in the chemical property.
b) plants using CO₂ and H₂O to form O₂ and sugar is a chemical change because new products which are chemically different are formed.
c) boiling water - is a physical change because only the physical state from liquid to gas changes. Chemically water retains its properties.
d) frying an egg - the properties of egg changes after frying. Hence, it is a chemical change. A fried egg does not retain properties of an uncooked one.
e) rust forming on metal- is a chemical change. Corrosion ( rusting) is a chemical change as rust is chemically different from the metal.
f) fruit rotting - is a chemical change. When microbes act on the fruit, the fruit starts to rot.
g) removing salt from water by evaporation- it is a physical change. The salt and water retain their physical properties as mixture and when separated by evaporation process.
B. The force does not result in displacement
C. The force and displacement are perpendicular to each other
D. The force and displacement are in the same direction
Answer:
Work is said to occur when a force is able to cause displacement of an object in the direction of the applied force. It is given by the scalar product of force and displacement.
W = F.s = F s cos θ
Thus, no work is being done when no force is applied ( ∵ F = 0, W = 0) or the force does not result into displacement (∵ s = 0, F = 0) or when the force and displacement are perpendicular to each other (∵ θ =0, cos θ =0, W =0).
Answer: D. The force and displacement are in the same direction
Explanation: The guy above me is trying to hard to put information into his answer...
at the bottom of each page
at the end
in the appendix
Answer:
at the end of the page
Explanation:
leave a rating for my dying soul please. :)
Answer:
at the end
Explanation:
B. 2.8 m/s2
C. 3.8 m/s2
D. 1.1 m/s2
Answer:
Acceleration due to Gravity:
Explanation:
Here g is acceleration due to gravity. So C. 3.8 m/s2
b. lamp
c. resistor
d. ammeter
In a battery we can able to find the voltage gain.
The following information should be considered;
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Answer:
A
Explanation: