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3 years ago

8. Which element will form a 2-ion? sulfur Calcium potassium helium

Physics

2 answers:

Nookie1986 [14]3 years ago

8 0

The Group 16 elements

Hoochie [10]3 years ago

4 0

Answer:

I believe it's helium.

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A flea jumps straight up to a maximum height of 0.400 m . what is its initial velocity v0 as it leaves the ground?

timama [110]

For an object`s motion, the Kinematic equation is,

$v^2=v_{0}^2+2ah$

Here, v is the final velocity and h is stands for the height of the object and a is the acceleration of the object.

As according to question,

$v=0m/s,a=g-9.8 m/s^2$ and $h = 0.400 m$

Thus, putting these values in above equation, we get

$0= v_{0}^2 -2gh$

$v_{0} =\sqrt{2 \times 9.8 \times 0.400 }$

$v_{0} = 2.8 m/s$

Therefore, initial velocity is 2.8 m/s

8 0

3 years ago

What areas of the work force can science be applied to?

strojnjashka [21]

Answer:

Explanation:

In all works of life science can be applied, in-fact science has already been applied already, even in the humanities, social sciences and art related studies sciences is being applied,

Furthermore, the application of science and technology knows no boundaries, and as science is advancing day by day, expanding to new frontiers and breaking new limits so is it application to all works of life and relevance everyday.

4 0

3 years ago

The maximum stress in a section of a circular tube subject to a torque is τmax = 27 MPa . If the inner diameter is Di = 3.75 cm

DIA [1.3K]

Answer:

$T_{max} = 4.735\,kN\cdot m$

Explanation:

The shear stress due to torque can be calculed by using the following model:

$\tau_{max} = \frac{T_{max}\cdot r_{ext}}{J_{tube}}$

The maximum torque on the section is:

$T_{max} = \frac{\tau_{max}\cdot J_{tube}}{r_{ext}}$

The Torsion Constant for the circular tube is:

$J_{tube} = \frac{\pi}{32}\cdot (D_{ext}^{4}-D_{int}^{4})$

$J_{tube} = \frac{\pi}{4}\cdot [(0.053\,m)^{4}-(0.038\,m)^{4}]$

$J_{tube} = 4.560\times 10^{-6}\,m^{4}$

Now, the require output is computed:

$T_{max} = \frac{(27\times 10^{3}\,kPa)\cdot (4.560\times 10^{-6}\,m^{4})}{0.026\,m}$

$T_{max} = 4.735\,kN\cdot m$

7 0

3 years ago

Read 2 more answers

What happens when heat is transferred by convection

Dimas [21]

Convection<span> is </span>heat transfer<span> by mass motion of a fluid such as air or water when the </span>heated<span> fluid is caused to move away from the source of </span>heat<span>, carrying energy with it. </span>

3 0

3 years ago

A slingshot fires a pebble from the top of a building at a speed of 15.0 m/s. The building is 30.0 m tall. Ignoring air resistan

dimaraw [331]

Answer:

V=28.5m/s

b=V=28.5m/s

c=V=28.5m/s

Explanation:

A slingshot fires a pebble from the top of a building at a speed of 15.0 m/s. The building is 30.0 m tall. Ignoring air resistance, find the speed with which the pebble strikes the ground when the pebble is fired.

(a) horizontally,

(b) vertically straight up,

(c) vertically straight down.

u=15m/s

yi=30m

v=?

yf=0

system=pebble+earth

workdone=0

chnage in energy=0

ki+Ui=Kf+Ui

K=kinetic energy

U=potential energy

1/2mv^2+mgyf=1/2mu^2+mgyi

V^2=u^2+2gyi

V= $\sqrt{15^2+2*9.81*30}$

V=28.5m/s

b. and c will be the same as a. because the magnitude of the kinetic energy is dependent on the velocity and not the magnitude which the pebble is tilted at

3 0

3 years ago