Answer:
When force and displacement are in the same direction, the work performed on an object is said to be positive work. Example: When a body moves on the horizontal surface, force and displacement act in the forward path. The work is done in this case known as Positive work.
Explanation:
Hope this helps you
change in momentum of car is given as
here we have
given that
m = 2000 kg
now we have
a measurable variable and a subjective opinion.
Explanation:
Testable hypothesis that leads to experiments usually describes a relationship between a measurable variable and a subjective opinion.
In testing a hypotheses through experiments, we often design our work to suit the use of two variables which are the measurable variable and the subjective opinion.
- This often takes the shape of dependent and independent variables in an experiment.
- Measurable variables can either be dependent, independent or controlled variables.
- The subjective opinion is the scientific logic that governs hows two or more variables are related.
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Experiments brainly.com/question/5096428
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Most of the question 1 is chopped off so I'll try my best to answer.
1ai) In a telephone, the sound is converted into electrical signals before being sent through the wire before converted back into sound.
1aii) Sound travels by the collision between particles. In solids, the particles are closely packed (as compared to air molecules) and thus collide with their neighbors quickly after being disturbed, allowing for sound to be passed on at a faster rate.
b) Can't help much on this one.
Answer:
A
Explanation:
physical model is something that you are able to hold, for example a rock.
