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ohaa [14]
3 years ago
15

A 0.017-kg acorn falls from a position in an oak tree that is 18.5 meters above the ground. Calculate the velocity of the acorn

just before it reaches the ground (rounding your answer to the integer) and its kinetic energy when hitting the ground (rounding your answer to the nearest tenth)
Physics
1 answer:
sdas [7]3 years ago
5 0

Answer:

The velocity of the acorn just before it reaches the ground is 19 m/s

The kinetic energy when hitting the ground is 3.1 J

Explanation:

Given;

mass of the acorn, m = 0.017 kg

height of fall, h = 18.5 m

Apply the law of conservation of mechanical energy;

mgh = ¹/₂mv²

gh = ¹/₂v²

v² = 2gh

v = √2gh

v = √(2 x 9.8 x 18.5)

v = 19 m/s

Thus, the velocity of the acorn just before it reaches the ground is 19 m/s

Now, determine the kinetic energy when hitting the ground;

K.E = ¹/₂mv²

K.E = ¹/₂(0.017)(19)²

K.E = 3.09 J

K.E = 3.1 J

Therefore, the kinetic energy when hitting the ground is 3.1 J

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Answer:

Newton's corpuscular theory stated that light consisted of particles that travelled in straight lines. Huygens argued that if light were made of particles, when light beams crossed, the particles would collide and cancel each other. He proposed that light was a wave.

6 0
2 years ago
how much energy would microraptor gui have to expend to fly with a speed of 10 m/sm/s for 1.0 minute?
Ray Of Light [21]

Much energy as would Microraptor gui have to expend to fly with a speed of 10 m/s for 1.0 minutes is 486 J.

The first step is to find the energy that Microraptor must release to fly at 10 m/s for 1.0 minutes. The energy that Microraptor must expend to fly can be found using the relationship between Power and Energy.

P = E/t

Where:

P = power (W)

T = time (s)

Now, a minimum of 8.1 W is required to fly at 10 m/s. So, the energy expended in 1 minute (60 seconds) is

P = E/t

E = P x t

E = 8.1 x 60

E = 486 Joules

Thus, the energy that Microraptor must expend to fly at 10 m/s for 1.0 minutes is the 486 J.

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3 0
1 year ago
PLS HURRY ITS TIMED Sayid recorded the temperatures of four substances in a chart what conclusion best supported by the data?
Vlada [557]

Answer:

WERES THE PICTURE AND WHATS THE CHART!!!

Explanation:

3 0
3 years ago
Who was the first president of America​
ivolga24 [154]

Answer:George Washington

Explanation:On April 30, 1789, George Washington, standing on the balcony of Federal Hall on Wall Street in New York, took his oath of office as the first President of the United States.

5 0
3 years ago
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Tectonic plates are large segments of the earth's crust that move slowly. Suppose that one such plate has an average speed of 4.
Lelechka [254]

Answer:

1.267 nanometers.

Explanation:

From the question,

Speed = distance/time.

S = d/t.................. Equation 1

Make d the subject of the equation,

d = S×t ............................... Equation 2

Given: S = 4.0 cm/year, t = 1 seconds = 3.17×10⁻⁸ years

Substitute into equation 2

d = 4×3.17×10⁻⁸ =

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d = 1.267 nanometers.

Hence the Tectonic plates move 1.267 nanometers.

7 0
3 years ago
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