3 years ago

Which statement describes the difference between renewable and nonrenewable energy sources

1 answer:

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Renewable souces are sources that replenish naturally, they can never be depleted. Nonrenewable sources have a limited amount of and cannot be replenished forever...

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Which conclusion, based on measurements of the ball in the lab in this lesson, is correct? a. The density of the ball was 1.48 g

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Explanation:

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2 years ago

If a particle's position is given by x=4-12t+3t^2, where t is in seconds and x is in meters, what is its velocity at t=1 second?

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Answer:

v = -6m/s

Explanation:

$x=4-12t+3t^2$

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For t = 1:

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3 years ago

What TWO things affect the gravitational force acting on an object?

ohaa [14]

The strength of the gravitational forces between two masses depends on

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2 years ago

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7. How long does it take a ball rolling down a hill to change its speed from 3 m/sec to 34.5 m/sec

lys-0071 [83]

The time elapsed is 9 seconds

Explanation:

The motion of the ball is a uniformly accelerated motion (a motion with constant acceleration), so we can use the following suvat equation:

$v=u+at$

where :

v is the final velocity of the ball

u is the initial velocity

a is the acceleration

t is the time elapsed

For the ball in this problem, we have:

u = 3 m/s is the initial velocity

v = 34.5 m/s is the final velocity

$a=3.5m/s^2$ is the acceleration

Solving for t, we find the time taken for this change in velocity:

$t=\frac{v-u}{a}=\frac{34.5-3}{3.5}=9 s$

Learn more about acceleration:

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3 years ago

5. If a spring with a 40 N/m spring constant is used to push a 10 kg ball to a speed of 2 m/s,

kolbaska11 [484]

By compressing the spring a distance x (in m), you are storing 1/2 k x ² (in J) of potential energy, which is converted completely into kinetic energy 1/2 m v ², where

• k = 40 N/m = spring constant

• m = 10 kg = mass of the ball

• v = 2 m/s = ball's speed (at the moment the spring returns to its equilibrium point)

So we have

1/2 k x ² = 1/2 m v ²

x = √(m/k v ²) = √((10 kg) / (40 N/m) (2 m/s)²) = 1 m

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2 years ago