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nalin [4]
3 years ago
5

A rock is placed into a graduated cylinder containing 80 mL of water. What is the volume of the rock if the water level rises to

the 120 mL mark?
Physics
1 answer:
erastovalidia [21]3 years ago
6 0
Ok so the expression that you will be doing is water-water+object. The actual expression is 120-80. The answer would be 40mL. Remember, don't forget your units! :)
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A ball is dropped from a building taking 3sec to fall to the ground. Calculate:
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Answer:

Vf = 29.4 m/s

h = 44.1 m

Explanation:

Data:

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  • Gravity (g) = 9.8 m/s²
  • Time (t) = 3 s
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==================================================================

Final Velocity

Use formula:

  • Vf = g * t

Replace:

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Multiply:

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==================================================================

Height

Use formula:

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Replace:

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Multiply time squared:

  • \boxed{h=\frac{9.8\frac{m}{s^{2}}*9s^{2}}{2}}

Simplify the s², and multiply in the numerator:

  • \boxed{h=\frac{88.2m}{2}}

It divides:

  • \boxed{h=44.1\ m}

What is the velocity when falling to the ground?

The final velocity is <u>29.4 meters per seconds.</u>

How high is the building?

The height of the building is <u>44.1 meters.</u>

3 0
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Which of the following is the best definition of energy?
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Find the length of a pendulum that oscillates with a frequency of 0.16 hz. the acceleration due to gravity is 9.81 m/s 2 . answe
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The period of the pendulum is given by
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where L is the length of the pendulum, and g the acceleration of gravity. By re-arranging the formula and using the value of T we found before, we can  calculate the length of the pendulum L:
L=g  \frac{T^2}{(2 \pi)^2}=(9.81 m/s^2)  \frac{(6.25 s)^2}{(2 \pi)^2}=9.71 m
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3 years ago
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