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3 years ago

What is the relationship between the structure of a white blood cell and its function in the body.

1 answer:

6 0

White blood cell,also called leukocyte or white corpuscle,a cellular component of the blood that lacks hemoglobin,has a nucleus,is capable of motility,and defends the body against infection and disease by ingesting foreign materials and cellular debris,by destroying infectious agents and cancer cells.

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A 4.0-kg object moving at 3.0 m/s experiences a 16.0-Newton resistive force over a duration

sveta [45]

Answer:

D is the answer hope you it helps you

7 0

3 years ago

What element is created when hydrogen atoms fuse together in the sun’s core?

Lilit [14]

Answer:

It's Helium.

Explanation:

The superficial layers of the star compress the core as an effect of its own gravity. Therefore, atoms will be closer to each other in the core, allowing them to be combined.

A nuclear reaction occurs when light elements combine into heavier elements (that is known as nucleosynthesis). Different ways in which that can happen exist, but the most common in the Sun, according to its mass, is the Proton-Proton chain reaction. In that fusion reaction two atoms of Hydrogen are combined to form Helium.

Remember that a Helium atom is composed of two Protons and two Neutrons.

The Proton-Proton chain works in the following way:

$^{1}H$ + $^{1}H$ = $^{2}H$ + $\nu$ + $e^{+}$

Two Protons combine each other ( $^{1}H$ ) and one Deuterium ( $^{2}H$ ) is gotten, and one Neutrino ( $\nu$ ), and one Positron ( $e^{+}$ ) are emitted from them.

$^{2}H$ + $^{1}H$ = $^{3}He$ + $\gamma$

A deuterium and Proton combine each other and a Helium three nucleus( $^{3}He$ ) is gotten, and a gamma ray ( $\gamma$ ) is emitted.

$^{3}He$ + $^{3}He$ = $^{4}He$ + $^{1}H$ + $^{1}H$

Two Helium three nucleus combine and a Helium atom ( $^{4}He$ ) is gotten, and two Protons are emitted.

So, when hydrogen atoms fuse together helium is created.

3 0

3 years ago

Si un cuerpo se encuentra en reposo tiene energía cinética?¿por qué?

posledela

Answer:

This is because, when an object which has possessed kinetic energy under its being in motion hits another object, which is stationary the object at rest receives part of the energy inherent in the body which has kinetic energy and expresses the received energy in the form of motion or some forms different from the initial stationary position.

Explanation:

7 0

4 years ago

A wire with a resistance of 10 ohm is stretched so that its new length is four times its original length. find the resistance of

amm1812

Let original length be L. The new length is therefore 4L.

Let original cross sectional surface area of the wire be equal to πr^2.

This means original volume was L x πr^2 = Lπr^2

The volume is the same but the length is different so 4L x new surface area must be equal to Lπr^2. Let new surface area be equal to Y.

4L x Y = Lπr^2
=> Y = (πr^2 )/ 4

Using the resistivity formula,
R = pL/A. p which is resistivity is a constant so it stays the same

But this time, instead of L we have 4L and instead of πr^2 we have (πr^2)/4.

so the new resistance
= (4Lp)/ {(πr^2)/4}
= 16 (pL)/(πr^2)
= 16 (pL)/A. because πr^2 is A
since pL/A is equal to R from the formula, this is equal to
16 R.

R was 10 ohms
therefore new resistance is 16 x 10 = 160 ohms

6 0

4 years ago

Calculate the force it would take to accelerate a 250 kg motorcycle at a rate of 5m/s^2

bija089 [108]

1250 N of force is required to accelerate a 250 kg motorcycle at a rate of 5 m/ $s^{2}$ .

<u>Explanation:</u>

As per the second law of motion stated by Newton, the net unbalanced external force acting on any object is directly proportional to the product of mass and acceleration experienced by the object.

As here the object is given as motorcycle of mass 250 kg. Also the acceleration exhibited by the motorcycle is stated as 5 m/ $s^{2}$ . So from the Newton's second law of motion,

Net force = Mass of the motorcycle× Acceleration of the motorcycle

Net force = 250 × 5 = 1250 N.

Thus, 1250 N of force is required to accelerate a 250 kg motorcycle at a rate of 5 m/ $s^{2}$ .

5 0

3 years ago