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3 years ago

Nitrogen has has an atom number of , which means that is has protons

2 answers:

7 0

Nitrogen's atomic number is 7, meaning that it has 7 protons since the atomic number represents the number of protons

Hope this helps

MArishka [77]3 years ago

4 0

The atomic number of nitrogen is 7, meaning it has 7 protons.

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Suppose that the moment of inertia of a skater with arms out and one leg extended is 3.5 kg⋅m2 and for arms and legs in is 0.80

sergiy2304 [10]

Answer:

1.3 rev/s

Explanation:

$I_{o}$ = Moment of inertia when arms and one leg of the skater is out = 3.5 kgm²

$I_{i}$ = Moment of inertia when arms and legs of the skater are in = 0.80 kgm²

$w_{i}$ = Angular speed of skater when arms and legs of the skater are in = 5.5 rev/s

$w_{o}$ = Angular speed of skater when arms and legs of the skater are out = ?

Using conservation of angular momentum

$I_{i}$ $w_{i}$ = $I_{o}$ $w_{o}$

(0.80) (5.5) = (3.5) $w_{o}$

$w_{o}$ = 1.3 rev/s

8 0

3 years ago

The froghopper, Philaenus spumarius, holds the world record for insect jumps. When leaping at an angle of 58.0° above the horizo

Norma-Jean [14]

Answer:

0.528m

Explanation:

a)58.7 cm = 0.587 m

Let g = 9.8m/s2. When the frog jumps from ground to the highest point its kinetic energy is converted to potential energy:

$E_p = E_k$

$mgh = mv^2/2$

where m is the frog mass and h is the vertical distance traveled, v is the frog velocity at take-off

$v^2 = 2gh = 2*9.8*0.587 = 11.5$

$v = \sqrt{11.5} = 3.4 m/s$

b) Vertical and horizontal components of the velocity are

$v_v = vsin(\alpha) = 3.4sin(58^0) = 2.877 m/s$

$v_h = vcos(\alpha) = 3.4cos(58^0) = 1.8 m/s$

The time it takes for the vertical speed to reach 0 (highest point) under gravitational acceleration g = -9.8m/s2 is

$\Delta t = \Delta v / g = \frac{0 - 2.877}{-9.8} = 0.293s$

This is also the time it takes to travel horizontally, we can multiply this with the horizontal speed to get the horizontal distance it travels

$s_h = v_ht = 1.8*0.293 = 0.528 m$

3 0

3 years ago

A physics student with too much free time drops a watermelon from a roof of a building, hears the sound of the watermelon going

tatiyna

Answer:

28.6260196842 m

Explanation:

Let h be the height of the building

t = Time taken by the watermelon to fall to the ground

Time taken to hear the sound is 2.5 seconds

Time taken by the sound to travel the height of the cliff = 2.5-t

Speed of sound in air = 340 m/s

For the watermelon falling

$s=ut+\frac{1}{2}at^2\\\Rightarrow h=0t+\frac{1}{2}\times 9.81\times t^2\\\Rightarrow h=\frac{1}{2}\times 9.81\times t^2$

For the sound

Distance = Speed × Time

$\text{Distance}=340\times (2.5-t)$

Here, distance traveled by the stone and sound is equal

$\frac{1}{2}\times 9.81\times t^2=340\times (2.5-t)\\\Rightarrow 4.905t^2=340\times (2.5-t)\\\Rightarrow t^2=\frac{340}{4.905}(2.5-t)\\\Rightarrow t^2+69.3170234455t-173.292558614=0$

$t=\frac{-69.31702\dots +\sqrt{69.31702\dots ^2-4\cdot \:1\cdot \left(-173.29255\dots \right)}}{2\cdot \:1},\:t=\frac{-69.31702\dots -\sqrt{69.31702\dots ^2-4\cdot \:1\cdot \left(-173.29255\dots \right)}}{2\cdot \:1}\\\Rightarrow t=2.4158\ s\ or\ -71\ seconds$

The time taken to fall down is 2.4158 seconds

$h=\frac{1}{2}\times 9.81\times 2.4158^2=28.6260196842\ m$

Height of the buidling is 28.6260196842 m

7 0

4 years ago

Which statement supports the idea that the Earth rotates on its axis?

Ivenika [448]

Answer:

Explanation:

because the other would not make sense

3 0

3 years ago

<img src="https://tex.z-dn.net/?f=%20%5Csf%7B%20What%20%5C%3A%20is%20%5C%3A%20a%20%5C%3A%20parallel%20%5C%3A%20circuit%3F%20%7D"

crimeas [40]

Answer:

parallel circuit is a kind of circuits in which all components are connected between the same two sets of electrically common points, creating multiple paths for the current to flow from one end of the battery to the other:

8 0

3 years ago

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