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3 years ago

15

Mr. Brewer drove his car at a speed of 60 miles/hour as he traveled from his house to Troy Prep. What additional information wou

ld you need to determine Mr. Brewer’s velocity?

1 answer:

Lubov Fominskaja [6]3 years ago

4 0

Answer:how long it took him to get there

Explanation:

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11) Which statement about covalent bonds is true? A) Covalent bonds are generally weaker than ionic bonds because they form full

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Curtis, a student in our class, makes the following statement: The puck reached a slightly higher location on the ramp than I pr

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Answer and Explanation: No, the explanation is not plausible. The puck sliding on the ice is an example of the <u>Principle</u> <u>of</u> <u>Conservation</u> <u>of</u> <u>Energy</u>, which can be enunciated as "total energy of a system is constant. It can be changed or transferred but the total is always the same".

When a player hit the pluck, it starts to move, gaining kinetic energy (K). As it goes up a ramp, kinetic energy decreases and potential energy (P) increases until it reaches its maximum. When potential energy is maximum, kinetic energy is zero and vice-versa.

So, at the beginning of the movement the puck only has kinetic energy. At the end, it gains potential energy until its maximum.

The representation is as followed:

$K_{i}+P_{i}=K_{f}+P_{f}$

$K_{i}+0=0+P_{f}$

$\frac{1}{2}mv^{2} = mgh$

As we noticed, mass of the object can be cancelled from the equation, making height be:

$h=\frac{v^{2}}{2g}$

So, the height the puck reaches depends on velocity and acceleration due to gravity, not mass of the puck.

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3 years ago