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jeka57 [31]
3 years ago
10

What is the appropriate age of the earth based on current scientific theory

Physics
2 answers:
Ilya [14]3 years ago
7 0
The closet one is B but it 4.543 billion years

Zielflug [23.3K]3 years ago
7 0
The answer to this question is b , any other answer is unacceptable because the oldest rock on earth is 4 billion years old and when scientist look at earths layer they came to the conclusion that eearth is around the age of 4.6 billion years old not million :)
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Which type of nuclear reaction is used in commercial power generation?
Alisiya [41]

B. Fission

Should be correct

4 0
3 years ago
Read 2 more answers
A meter stick balances horizontally on a knife-edge at the 51 cm mark. With two nickels stacked over the 6.0 cm mark, the stick
Oliga [24]

Answer:

65g

Explanation:

Two main conditions for equilibrium are:

I. The resultant force must be equal to zero. That is, sum of the forces acting in one direction about a point must be equal to the sum of the forces acting in the opposite direction about the same point.

II. The resultant moment must be equal to zero. That is, sum of the moments in one direction about a point must be equal to the sum of the moments in another direction about the same point.

For the above question,

the 51cm mark is the point where the resultant weight of the meter stick lies,

the pivot or point is the 45cm mark where the stick balanced when 2 nickels ( total mass (5.0g x 2) 10g were placed at the 6cm mark.

Using the conversion factor:

1000g(1kg) = 10N, we can convert mass to weight, calculate the weight of the meter stick then reconvert to mass.

That is,

mass of 2 nickels = 10g = 10/1000 = 0.01N.

Moment = Force x distance from line of force to pivot of rotation

Applying the principle of equilibrium,

Moment of left side = Moment of right side

0.01 x (45-6) = W x (51-45)

Where W = weight of the meter stick

W x 6 = 0.01 x 39

W x 6 = 0.39

W = 0.39/6

W= 0.065N

Therefore, mass of meter stick = 0.065 x 1000 = 65g.

4 0
2 years ago
Grrr i don't have much time, help please T^T
mart [117]

Answer:

2. ( b ) zero

3. ( c ) 10 s

4. Uniform then decreasing

Explanation:

2.

Since the motion is uniform, initial and final velocity will be 0, hence acceleration will be zero.

3.

Initial velocity ( u ) = 5 m/s

Final velocity ( v ) = 35 m/s

Acceleration ( a ) 3 m/s^2

To find : Time ( t )

Formula : -

t = v - u / a

 = 35 - 5 / 3

 = 30 / 3

t = 10 s

4 0
1 year ago
Read 2 more answers
Mo Farah won the 10,000 meter race in the 2012 Olympics with an official time of 27 minutes, 30.42 s . To the correct number of
seropon [69]
Speed=distance/time
distance = 10,000 m
time= 27 min 30.42s but we need to convert that completely to seconds
(27x60)+30.42= 1650.12 rounded to 1650
speed=10,000/1650.12
speed=6.059063
Because when we do sig dig we round to the least number of digits we would round to 4 because 1650.12 gets rounded to 1650
so 6.059 m/s
4 0
2 years ago
What would 7.68 cal/sec be if it were converted to kcal/sec?
inna [77]

Answer:

0.00768 kcal/sec

Explanation:

5 0
2 years ago
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