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polet [3.4K]
3 years ago
14

What was significant about the discovery of gallium

Physics
2 answers:
Kryger [21]3 years ago
8 0
It confirmed medeleeve's hypothesis (prediction) and showed the use of his table
Alenkasestr [34]3 years ago
8 0

Answer:

The significance of the discovery of Gallium is discussed below.

  • Dmitri Mendeleev predicts all properties and elements in the periodic table.
  • In 1875 Paul Emile Lecoq de boibaudran discovered gallium in the pyrenees mountains.
  • Before this Gallium was not physically discovered since Mendeleev's death although Mendeleev predicts its presence even he never saw it before.
  • Gallium is also known by "Ga", it is a Metal and Its state of matter is liquid at room temperature.
  • Gallium is a solid metal at room temperature that melts in your hands.

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A 0.155 kg arrow is shot upward
solniwko [45]

Answer:

2.43J

Explanation:

Given parameters:

Mass of the arrow = 0.155kg

Velocity = 31.4m /s

Unknown:

Kinetic energy when it leaves the bow = ?

Solution:

The kinetic energy of a body is the energy in motion of the body;

 it can be derived using the expression below:

 

   K.E  = \frac{1}{2}  m v²

m is the mass

v is the velocity

 Solve for K.E;

    K.E  =  \frac{1}{2}  x 0.155 x 31.4 = 2.43J

3 0
2 years ago
Read 2 more answers
Meher is riding a bicycle on a slope. explain the different motions taking place during this time​
gtnhenbr [62]

Answer:

Mehar cant ride down the slope

Explanation:

She does not has a bicycle

7 0
3 years ago
What is a particulate ? Name a couple of examples.
Nikitich [7]

Answer:Particulates are small, distinct solids suspended in a liquid or gas and example are dust,soot,and salt particles

Explanation:

3 0
3 years ago
A baby carriage is sitting at the top of a hill that is 35 m high. The
Lemur [1.5K]
P=M(mass)G(Gravity)H(Height)

Gravity=9.8

M=1.5 G=9.8 H=35

so multiply all

=514.5 potential energy

5 0
2 years ago
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A delivery truck travels with a constant velocity up an 8 slope. A 60 kg box sits on the floor of the truck and, because of sta
Blababa [14]

Explanation:

Given that,

The slope of the ramp, \theta=8^{\circ}

Mass of the box, m = 60 kg

(a) Distance covered by the truck up the slope, d = 300 m

Initially the truck moves with a constant velocity. We know that the net work done on the box is equal to 0 as per work energy theorem as :

W=\dfrac{1}{2}m(v^2-u^2)=0

u and v are the initial and the final velocity of the truck

(b) The work done on the box by the force of gravity is given by :

W=Fd\ cos\theta

Here, \theta=90+8=98^{\circ}

W=mgd\ cos\theta

W=60\times 9.8\times 300\ cos(98)

W = -24550.13 J

(c) What is the work done on the box by the normal force is equal to 0 as the angle between the force and the displacement is 90 degrees.

(d) The work done by friction is given by :

W_f=-W

W_f=24550.13\ J

Hence, this is the required solution.

6 0
3 years ago
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