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stiv31 [10]
3 years ago
10

What Was The Name Given to the belief that life is made up of competitive struggle and only the fittest survive

Social Studies
1 answer:
mr_godi [17]3 years ago
4 0
Darwinism came up with the idea of natural selection.
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. Which form of government could be described as “rule of all”? Explain why.
ioda

a dictator ship would be correct because one person has all the power over a country everything that person says goes

i hope it helps

4 0
3 years ago
Read these sentences from the text:
11111nata11111 [884]

The correct answer is B. The infection most likely causes bats to wake up during hibernation.

Explanation

According to the fragment of the question, the author said that bats need fat to feed during the hibernation from winter to spring, also they "wake up briefly once or twice a month". On the other hand, the author said "Infected bats seem to run out of fat in the middle of winter", also they "wake up from hibernation every four to five days", and "expend valuable calories flying around" According to the above, the conclusion that can be drawn about the infection is the infection probably causes bats to wake up during hibernation, because only infected bats have an abnormal hibernation cycle, also, this might be associated to the low  rate of fats that are found in infected bats.

3 0
3 years ago
Assume that the rod in Fig.31.2 has a length of 0.86 m,the resistor has value 2.2 ,and a magnetic field of 8.0 T is directed int
frutty [35]

1) 0.48 m/s

2) Clockwise

3) 10.3 N

Explanation:

1)

The figure is missing: find it in attachment.

As the rod is pulled along the rails, in the region of magnetic field, an electromotive force is induced in the rod itself, due to the change in magnetic flux through the circuit enclosed by the rod and the rails.

The magnitude of this induced electromotive force (which is equivalent to the potential difference induced in the rod) is

V=BvL

where:

B is the strength of the magnetic field

v is the speed of the rod

L is the length of the rod

Also we know that according to Ohm's law, the potential difference across the resistance is equal to

V=RI

where

R is the resistance of the rod

I is the current

Since the potential difference across the resistor is equal to the potential difference across the rod, we can combine the two equations, and we get:

BvL=RI\\v=\frac{RI}{BL}

Here we have:

R=2.2 \Omega\\B=8.0 T\\L=0.86 m\\I=1.5 A

Therefore, the speed of the rod must be:

v=\frac{(2.2)(1.5)}{(8.0)(0.86)}=0.48 m/s

2)

Here we have to apply Lenz's law, which states that the direction of the induced emf (and so, of the induced current) is such that it opposes the change in magnetic flux through the system.

First of all, here we notice that as the rod moves, the area enclosed by the circuit decreases: this means that the magnetic flux through the circuit decreases too.

As a result, the induced current must produce a magnetic field which goes in the same direction as the external field, in order to "restore" the magnetic flux. Here the external magnetic field points inside the paper, so the magnetic field produced by the induced current must also point inside the paper.

In order for that to happen, we see that the induced current must flow clockwise: in fact, if we take the rod and we apply the right-hand rule, we see that if we place the thumb towards the left (direction of the clockwise current), the other fingers "wrapped" point into the paper at the center of the circuit, so this is the correct direction.

3)

A current-carrying wire in a magnetic field experiences a force of magnitude

F=ILB

where

I is the current

L is the length of the wire

B is the strength of the magnetic field

Here we have

I = 1.5 A

L = 0.86 m

B = 8.0 T

So the force experienced by the rod is

F=(1.5)(8.0)(0.86)=10.3 N

Therefore, we must apply an equal and opposite force of 10.3 N in order to maintain keep the acceleration of the rod to zero, so that the velocity is constant, and the current is constant as well.

7 0
2 years ago
Abolitionists were people who worked to end slavery <br><br> A. True <br> B. False
jonny [76]

Answer:

TRUTH

Explanation:

4 0
2 years ago
Read 2 more answers
Sociologist Frank Furstenberg points out that young adulthood facilitates a stage in personal and sexual development in modern s
Marta_Voda [28]

Answer: d. Young people today define adulthood in terms of abstract traits like self-reliance and happiness.

Explanation:

Furstenberg's work has focused on social change, the transition to adulthood, divorce, and intergenerational relationships. He explains that in the present, young people have a definition of adulthood that is more extensive than in the past. Instead of the achievement of distinct goals, such as the homeownership of a house, young people today define adulthood in terms of abstract traits such as self-reliance and happiness.  

8 0
3 years ago
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