Physics, 09.10.2019 21:30 lillianneal

Calculate the net work done by the wings of a 0.300 kg hawk as he flies in a straight line at an angle of 35° above the horizontal from a height of 10.0 m to a height of 50.0 m. his starting speed is 6.00 m/s and his final speed is 10.0 m/s. the drag force is an average of 2.5 n during the flight

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Answer from: mtzann1568

$W_{wing} = 301.5 J$

Explanation:

As we know by work energy theorem that net work done by all forces is equal to change in kinetic energy

so here we can say

$W_{wing} + W_{gravity} + W_{drag} = \frac{1}{2}m(v_f^2 - v_i^2)$

now we know that when plane moves upwards then

$W_{gravity} = -mgh$

$W_{gravity} = 0.300(-9.8)(50 - 10)$

$W_{gravity} = -117.6 J$

Now work done by drag force is given as

$W_{drag = -F_{drag} \frac{h_2 - h_1}{sin\theta}$

$W_{drag} = -2.5(\frac{50- 10}{sin35})$

$W_{drag} = -174.3 J$

now we have

$W_{wing} - 174.3 - 117.6 = \frac{1}{2}(0.300)(10^2 - 6^2)$

$W_{wing} = 301.5 J$

Answer from: Quest

nec chapter 5 contains

c. information on special occupancy areas

nec chapter 6 covers

a. special equipment

which of the following rules contain the words shall or shall not and must be adhered to?

b. mandatory rules

which of the following rules identify actions that are allowed but not required and typically cover options or alternative methods?

c. optional rules

which of the following serves as the introduction to the nec and provides an overview of the book?

a. nec article 90

organizations that test products for safety are

c. nrtls

the nec is published by the

a national fire protection association

the nec is divided into

b. 9 chapters

the nec provides informative annexes for

c. informational materials and examples

two terms from nec article 100 that trainees should become familiar with are

b. labeled and listed

explanation:

Answer from: Quest

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm. the wire diameter is d = 0.9 mm. the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2) in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

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Calculate the net work done by the wings of a 0.300 kg hawk as he flies in a straight line at an ang...

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