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Fed [463]
3 years ago
7

6) Consider a 10.0 kg block of wood that's released from rest at a distance 20.0m above the

Physics
1 answer:
tamaranim1 [39]3 years ago
3 0

Explanation:

a) Potential energy is weight times height.

PE = mgh

PE = (10.0 kg) (9.8 m/s²) (20.0 m)

PE = 1960 J

b) Energy is conserved.  As the block falls, potential energy is converted to kinetic energy.  Just before the block lands, all of the potential energy has been converted to kinetic energy.

KE = 1960 J

c) When the block has fallen half the distance, half the potential energy has been converted to kinetic energy.

KE = 1960 J / 2

KE = 980. J

d) Kinetic energy equals half the mass times the square of the velocity.

KE = ½ mv²

980. J = ½ (10.0 kg) v²

v = 14.0 m/s

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emmasim [6.3K]

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the air has to be unstable as well as it needs to be moved upwards.

Explanation:

it needs to be moved upwards and also needs to have unstable air.

3 0
2 years ago
Two nuclear reactors provide 3200 MW of power.If the transmission system loses 5.1% of the energy produced,how much power from t
Annette [7]

The power that the customers receive is 163.2 MW

Explanation:

The efficiency of a system is given by

\eta = \frac{P_{out}}{P_{in}}

where

P_{out} is the power in output

P_{in} is the power in input

For the nuclear reactors in this problem, we have:

P_{in} = 3200 MW (power generated by the reactors)

\eta=0.051 (efficiency is 5.1%)

Therefore, the power that reaches the customers is:

P_{out} = \eta P_{in} = (0.051)(3200)=163.2 MW

Learn more about power:

brainly.com/question/7956557

#LearnwithBrainly

6 0
3 years ago
Section 2.2
Feliz [49]

Answer:

Speed changes at the rate of 24 m/s for each second over time.

Explanation:

We are told the object's acceleration is equal to 24 m/s²

Now we know that acceleration can also be defined as the rate of change of speed with time. Also speed has a unit known as m/s.

Thus, we can rephrase the acceleration in this question to mean;

Speed changes at the rate of 24 m/s for every second with time.

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Batman recharges his Bat-taser with 2.5mj of energy in 15 minutes. How much power does it draw from the mains?
Gennadij [26K]

That would be 0.16 per min

7 0
3 years ago
What is. the units of velocity
natta225 [31]

Speed and velocity are both measured using the same units. The SI unit of distance and displacement is the meter. The SI unit of time is the second. The SI unit of speed and velocity is the ratio of two — the meter per second.

Source: https://physics.info/velocity/

Hope it helps!

4 0
3 years ago
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