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3 years ago

Elements in the same group/familly of the periodic table are similar in what way

Physics

1 answer:

olga nikolaevna [1]3 years ago

6 0

Their chemicals and their reactions, hope I helped

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A ball of mass m, attached to the end of a horizontal cord, is rotated in a circle of radius r on a frictionless horizontal surf

kirza4 [7]

Answer: $v=\sqrt{\frac{FL}{m}}$

Explanation:

Given

Ball of mass m

maximum Bearable Tension in string is F

Let length of the cord be L m and moving at a speed of v m/s

Here Tension will Provide Centripetal Force

T=Centripetal Force

$F=T=\frac{mv^2}{L}$

$v=\sqrt{\frac{FL}{m}}$

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3 years ago

79. An example of an electrical insulator is

vampirchik [111]

Answer:

B. Glass

Explanation:

An electrical insulator is a substance that does not conduct electricity.

Glass has tightly bounded electrons, that is why it is an insulator of electricity.

6 0

3 years ago

Read 2 more answers

A graduated cylinder contains 63.0 mL of water. A piece of gold, which has a density of 19.3 g/ cm3, is added to the water and t

icang [17]

Answer:

29.0 g

Explanation:

The mass of the piece of gold is given by:

m = dV

where

m is the mass

d is the density

V is the volume of the piece of gold

The density of gold is

d = 19.3 g/cm^3

while the volume of the sample is equal to the volume of displaced water, so

V = 64.5 mL - 63.0 mL = 1.5 mL

And since

1 mL = 1 cm^3

the volume is

V = 1.5 cm^3

So the mass of the piece of gold is:

m = (19.3 g/cm^3)(1.5 cm^3)=29.0 g

7 0

3 years ago

A sledge hammer has a mass of 4.0 kg and is moving at a speed of 6.0m/s when it strikes a fence post, driving it 10 cm further i

Afina-wow [57]

Part a)

kinetic energy of the hammer will be

$KE = \frac{1}{2} mv^2$

here we know that

m = 4 kg

v = 6 m/s

now by the equation of kinetic energy we have

$KE = \frac{1}{2}*4 * 6*6$

$KE = 72 J$

Part b)

for finding the force we will have

$v_f^2 - v_i^2 = 2 a d$

here we know that

$v_f = 0$

$v_i = 6 m/s$

$d = 10 cm = 0.10 m$

now from above equation we have

$0 - 6^2 = 2 * a * 0.10$

$a = -180 m/s^2$

now by Newton's II law we have

$F = ma$

$F = 4*180 = 720 N$

so it requires 720 N.

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3 years ago

The graph shows the acceleration, velocity, and displacement of a marble attached to a metal spring that has been secured to a t

SpyIntel [72]

<span>D. When velocity at a maximum, acceleration is also at a maximum.

Acceleration is the rate of change of velocity so, it is directly proportional to it, hence, when it will increase velocity will also increase

Hope this helps!</span>

7 0

3 years ago