2 years ago

What is one defining feature of a prokaryotic cell

Physics

1 answer:

trapecia [35]2 years ago

5 0

A. nucleus
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Newton's third law says that for every action force there is a reaction force which is

olga nikolaevna [1]

A. Equal and opposite For every action, there is an equal and opposite reaction

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2 years ago

A carpenter is driving a 15.0-g steel nail into a board. His 1.00-kg hammer is moving at 8.50 m/s when it strikes the nail. Half

bekas [8.4K]

Answer: The increase in temperature of the nail after the three blows is 8.0636 Kelvins. The correct option is (d).

Explanation:

Kinetic energy of the hammer ,K.E.=

$\frac{1}{2}mv^2=\frac{1}{2}1.00 kg\times (8.50 m/s)^2=36.125 J$

Half of the kinetic energy of the hammer is transformed into heat in the nail.

Energy transferred to the nail in one blow =

$\frac{1}{2}K.E.=\frac{1}{2}\times 36.125 J=18.0625 J$

Total energy transferred after 3 blows,Q = $3\times 18.0625 J=54.1875 J$

Mass of the nail = 15 g = 0.015 kg

Change in temperature = $\Delta T$

Specif heat of the steel = c = 448 J/kg K

$Q=mc\Delta T$

$54.1875 J=0.015 kg\times 448 J/kg K\times \Delta T$

$\Delta T=8.0636 K\approx 8.1 K$

The increase in temperature of the nail after the three blows is 8.1 Kelvins.Hence, correct option is (d).

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2 years ago

What is the tube that carries air inside a lung?

Elis [28]

The trachea is a tube that carries air inside the lungs.

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2 years ago

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A car goes from 5 m/s to 25 m/s in 6 s. What is the acceleration of the car?

damaskus [11]

Answer:

5m/s

Explanation:

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2 years ago

g At some point the road makes a right turn with a radius of 117 m. If the posted speed limit along this part of the highway is

user100 [1]

Answer:

Ф = 28.9°

Explanation:

given:

radius (r) = 117m

velocity (v) = 25.1 m/s

required: angle Ф

Ф = inv tan (v² / (r * g)) we know that g = 9.8

Ф = inv tan (25.1² / (117 * 9.8))

Ф = 28.9°

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3 years ago