If you've ever mixed water and oil together,you've probably noticed that the oil rises to the top and the water stays at the bottom-- no matter how much you try to shake them. This is because oil is less dense than water, making it float to the top. The molecules in oil are larger than those in water, so they don't pack as tightly together as they do in water. In a mixture of oil and vinegar, the<span> </span>oil <span>floats on the </span>vinegar/<span>water mixture, while the solids sink to the bottom. So, if one material floats over another, the material on top is less dense.
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Answer:
reactants --> products + thermal energy
Explanation:
Heat is absorbed in endothermic reaction.
Answer:112.7 N
Explanation: mass of chair = 11.5kg, g= acceleration due to gravity = 9.8m/s^2
F = applied force = 42.0 N
The normal reaction is always acting upwards which is given as
R = mg = 11.5 × 9.8 = 112.7 N
Answer:
1. The law of equal areas suggests that the imaginary line connecting the Sun to a planet sweeps out equal areas in equal amounts of time.
Explanation:
This statement correctly describes Kepler's 2nd law of planetary motion. The three Kepler laws of planetary motion are:
1st law: the orbits of the planets around the Sun are ellipses, with the Sun at one of the two focii
2nd law: an imaginary line connecting the Sun to a planet sweeps out equal areas in equal amounts of time
3rd law: the cube of the average distance of a planet from the Sun is proportional to the square of the orbital period of the planet
As we can see, the 2nd law corresponds to the first statement described in the question. Also, a result of this law is that the speed of a planet decreases as the planet moves farther from the Sun, while its speed is higher when the planet is close to the Sun.