A change in a populations genes from one generation to the next due to chance or accident is refrerred as a

12345 [234]

The nucleus is the core of an atom which is made up of protons and neutrons. Every single type of atom has a dense center and the majority of the mass is located in here.

4 0

2 years ago

Read 2 more answers

Which statement is true about using shorter,steeper inclined planes to lift an object?

Grace [21]

Is there supposed to be options with this or are those the options there, steeper and smaller

7 0

2 years ago

it takes car 1 minute to go from rest to 30 m/s east. What is the acceleration of this car? Please Show Work.

ivann1987 [24]

30-0 ÷ 60 = .5m/s²

(vi-vf) ÷ t = a

7 0

2 years ago

(b) The efficiency of the pump which operates the fountain is 70%.

ruslelena [56]

Answer:

Power supplied to the pump is 980000 W or 980 KW

Note: The question is incomplete. The complete question is given below:

On a day with no wind, a fountain in Switzerland propels 30000 kg of water per minute to a height of 140 metres.

a)Calculate the power used in raising the water?

b)The efficiency of the pump which operates the fountain is 70%

calculate the power supplied to the pump?

Explanation:

Efficiency = Power output/Power input * 100%

Power output = work done/ time

where work done = mass * acceleration due to gravity (g) * height

time = 1 minute = 60 seconds

mass of water = 30000 kg, height = 140 meters, g = 9.8 m/s²

Then, work done = 30000 * 140 * 9.8 = 41160000 J

Power output then = 41160000 J / 60 s

Power output = 686000 W

The power input can then be derived from the formula of efficiency

Power input = (Power output * 100)/Efficiency

Power input = (100 * 686000) / 70

Power input = 980000 W

Therefore, power supplied to the pump is 980000 W or 980 KW

8 0

2 years ago

Why doesn’t any light pass through the filter when the colors of the bulb and filter are different?

Keith_Richards [23]

Where does the name of the filter come from ?
I mean, why is a red filter called a "red" filter, and why is a "blue" filter
called a "blue" one ?
When you look at a 'red' filter, it looks red. Why do you think that is ?
It's because 'red' light is the ONLY light that can pass THROUGH the
filter and come out of other side. Light of any OTHER color besides red
gets absorbed IN the filter, and never comes OUT the other side.
So, ANY light that passes through the filter and continues to your eye
must be red light ... when you look at the filter, you 'see' red.
But this can only happen IF there's some red light going IN on one side.
If there's no red light going in, then there isn't ANY light coming out, and
the filter looks black !

If the bulb shines with a COLOR, and that color gets ABSORBED
in the filter, then there's no light coming out the other side of the
filter.

3 0

2 years ago