PHYSICS HIGH SCHOOL

What is the momentum of a 52 kg carton that slides at 5.0m/s across an icy surface?

Answers

Answer 1
Answer: Formula for momentum is mass times velocity so you do 52 kg times 5 m/s and that equals 260 kg x m/s

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Polluted water can contribute to

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The spread of waterborne diseases.
Death of aquatic life.
Reduced and low quality crop yields.

The modern periodic table is arranged in order of increasing atomic

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The periodic table is in increasing atomic mass. Hope this helped.
yes your statement is true  hopeful this helped you  a little 

How has the model of our solar system changed over time?

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It depends.Ptolemy was one of the most famous astronomers who was convinced that or solar system was geocentric, or revolving around the earth. Then, Copernicus came around, along with Galileo, and the attempted to convince people that that wasn't true, but that we were revolving around the sun. In fact, if you're writing an essay, a good point to add would be that Galileo spent a large part of his life imprisoned for "disobedience of the (Roman) Gods.)"

It always depends of how our solar system changed over time.

Is energy conserved when a ball falls to the ground

Answers

Of course. You've certainly heard that energy is conserved, period. Why would you think it's different when a ball falls to the ground ? ?

Water _____.a. has a pH value of 0
B: expands when it freezes
C: is less dense than ice
D: dissolves in most substances

Answers

Water does not have a pH of 0, its actually 7. Also, it is not less dense than ice. Lastly, it does not dissolve in most substances, its the complete opposite. As its a solvent, not a solute. 

Answer: B

A small 20-kilogram canoe is floating downriver at a speed of 2 m/s. What is the canoe's kinetic energy?

Answers

Answer: 40 Joules

Explanation: Kinetic energy is the energy possessed by a body by virtue of its motion.

Kinetic energy depends on the mass and speed of the object.

K.E=(1)/(2)* mv^2

m= mass of canoe = 20 kg

v= speed of canoe = 2 m/s

K.E=(1)/(2)* 20kg* (2m/s)^2

K.E=40kgm^2s^-{2}=40Joules

(1kgm^2s^(-2)= 1Joule)
Ek=1/2mv^2 = (20)(1/2)(2x2) =40
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