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3 years ago

Which vocabulary term is survival of the fittest

1 answer:

6 0

Natural selection also means survival of the fittest. This is where organisms who are better adapted to their environment survive and produce more offspring compared to the ones who aren’t as adapted to their environment.

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You attach a block to the bottom end of a spring hanging vertically. You slowly let the block move down and find that it hangs a

yKpoI14uk [10]

Answer:36 cm

Explanation:

Given

At Equilibrium extension a is 18 cm

suppose m is the mass of block

thus

$ka=mg$

$k=\frac{mg}{a}$

$k=\frac{mg}{0.18}$

Now if the block is released from un-stretched position

conserving Energy and supposing block moves x units down

$\frac{1}{2}kx^2=mgx$

$x=\frac{2mg}{k}$

$x=2mg\times \frac{0.18}{mg}$

$x=0.36 \approx 36 cm$

5 0

3 years ago

Every atom contains a<br> .............. which is positively charged

Arisa [49]

Answer:

Proton

Explanation:

The nucleus has an overall positive charge as it contains the protons. Every atom has no overall charge (neutral). This is because they contain equal numbers of positive protons and negative electrons.

5 0

2 years ago

A 30kg uniform solid cylinder has a radius of 0.18m. if the cylinder accelerates at 0.023 rad/s^2 as it rotates about an axis th

Nuetrik [128]

Answer:

0.011 N-m

Explanation:

Given that

The mass of a solid cylinder, m = 30 kg

The radius of the cylinder, r = 0.18 m

The acceleration of the cylinder, $\alpha =0.023\ rad/s^2$

It rotates about an axis through its center. We need to find the torque acting on the cylinder. The formula for the torque is given by :

$\tau=I\alpha$

Where

I is the moment of inertia of the cylinder,

For cylinder,

$I=\dfrac{mr^2}{2}$

So,

$\tau=\dfrac{mr^2\alpha }{2}\\\\\tau=\dfrac{30\times (0.18)^2\times 0.023 }{2}\\\\\tau=0.011\ N-m$

So, the required torque on the cylinder is 0.011 N-m.

7 0

2 years ago

College students living off-campus frequently consume large amounts of ramen noodles and boxed macaroni and cheese. When they fi

tigry1 [53]

Answer:

Ramen Noodles and boxed Macaroni and Cheese are COMPLEMENTARY Goods

Explanation:

Complementary Goods are goods that are demanded jointly (together) to satisfy a particular want.

Ramen Noodles, Boxed Macaroni, Cheese are demanded together by off campus college students. So, they are complementary goods.

Also, their demand are directly related - demand of one good increases, demand of other good increases & demand of one good decreases , demand of other good decreases ; because they are demanded together.

After school end , consumption of all goods declining together - is also their characteristic pointing towards them being Complementary Goods .

4 0

3 years ago

Two hoops, starting from rest, roll down identical inclined planes. The work done by nonconservative forces, such as air resiste

Maurinko [17]

Answer: both hoops have the same kinetic energy at the bottom of the incline.

Explanation:

If we assume no work done by non conservative forces (like friction) , the total mechanical energy must be conserved.

K1 + U1 = K2 + U2

If both hoops start from rest, and we choose the bottom of the incline to be the the zero reference level for gravitational potential energy, then

K1 = 0 and U2 = 0

⇒ ΔK = ΔU = m g. h

If both inclines have the same height, and both hoops have the same mass m, the change in kinetic energy, must be the same for both hoops.

6 0

3 years ago