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3 years ago

What element has 5 valence electrons, but more than 7 protons and less than 33 protons?

Physics

1 answer:

MAVERICK [17]3 years ago

7 0

Answer:

Phosphorus (P)

Explanation:

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DNA is coiled into chromosomes in a cell's

tia_tia [17]

Answer: Cell's nucleus

Explanation :

The full form of DNA is Deoxyribonucleic acid. The genetic information of a cell is organized in the DNA. It is inherited from parents by their children.

DNA is coiled into chromosomes in a cell's nucleus. It has a shape like a double helix. It is twisted in the form of spirals.

Hence, DNA is coiled into chromosomes in a cell's Nucleus.

6 0

3 years ago

Read 2 more answers

A ball is thrown upwards from the edge of a cliff. The horizontal velocity and vertical velocity are both 20m/s the distance fro

german

Answer:

20m

6.9s

Explanation:

The vertical velocity of the ball is 20m/s. We can calculate the kinetic energy which gets transferred to potential energy once it gets to the top.

$E_k = E_p$

$0.5mv^2 = mgh$

$h = \frac{0.5v^2}{g}$

we can subtitute v = 20m/s and g = 10m/s2

$h = \frac{0.5*20^2}{10} = 20 m$

So the ball could go 20m high from the child hand, or 120m fro the bottom of the cliff.

The time it takes for the ball to travels to the top is the time it takes for it to decelerate from 20m/s to 0m/s with gravitational deceleration g = 10m/s2

t = v / g = 20 / 10 = 2s

Then the ball will start accelerating down ward with a constant acceleration of g = 10m/s. In order to cover distance d of 120m from the top to the bottom of the cliff

$d = \frac{gt_2^2}{2}$

$t^2 = \frac{2d}{g} = \frac{2*120}{10} = 24$

$t = \sqrt{24} = 4.9s$

So the total time it takes is 4.9 + 2 = 6.9s

3 0

3 years ago

How do we know if something is moving?

nadya68 [22]

An object is in motion if its distance relative to another object is changing. To tell if an object is moving, you use a reference point. If an object's distance from another object [reference point] is changing. A place or object used for comparison to determine if something is in motion.

5 0

3 years ago

Heat engines convert which type of energy into mechanical work

KonstantinChe [14]

Answer: Heat engines convert chemical energy to mechanical energy

Explanation:

7 0

3 years ago

A motorcycle accelerated from 10 metre per second to 30 metre per second in 6 seconds. How far did it travel in this time ?

Ber [7]

U=10 m/s
v=30 m/s
t=6 sec

therefore, a=(v-u)/t
=(30-10)/6
=(10/3) ms^-2

now, displacement=ut+0.5*a*t^2
=60+ 0.5*(10/3)*36
=120 m
And you can solve it in another way:

v^2=u^2+2as
or, s=(v^2-u^2)/2a
=(900-100)/6.6666666.......
=120 m

7 0

4 years ago