2 years ago

1) How much time does it take to lift a box using 18.0 J of work and 20.89 Watt of power?

Physics

1 answer:

oee [108]2 years ago

7 0

Answer:.

Explanation:

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Which statement best describes the circular flow model?

aleksley [76]

Can you please include the statement or the model?

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A car is travelling at a constant speed of 26.5 m/s. Its tires have a radius of 72 cm. If the car slows down at a constant rate

maksim [4K]

Answer:

Magnitude of angular acceleration = -3.95 rad/s²

Explanation:

Angular acceleration is the ratio of linear acceleration and radius.

That is

$\texttt{Angular acceleration}=\frac{\texttt{Linear acceleration}}{\texttt{Radius}}\\\\\alpha =\frac{a}{r}$

Radius = 72 cm = 0.72 m

Linear acceleration is rate of change of velocity.

$a=\frac{11.7-26.5}{5.2}=-2.85m/s^2$

Angular acceleration

$\alpha =\frac{a}{r}=\frac{-2.85}{0.72}=-3.95rad/s^2$

Angular acceleration = -3.95 rad/s²

Magnitude = 3.95 rad/s²

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Determine the half-life of uranium-238 based on the graph.

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From the curve on the graph we can see, when y=50 x=4.5
the unit of x-axis is in "billions of years", so the answer is 4.5 billions of years

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Which statement did Kepler’s investigations of the movement of the planets explain?

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Answer:

It’s the fourth one :)