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3 years ago

A material that lets electricity pass through it is called

Physics

1 answer:

ZanzabumX [31]3 years ago

6 0

These metals are called electrical (conductors)

5 star plz and brainliest

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Until 1883, every city and town in the United States kept its own local time. Today, travelers reset their watches only when the

inna [77]

Answer:

135° (degrees)

Explanation:

The Earth rotates 360° in about 24 h

How many degrees in 1 hour

$360^{\circ}=24\ h\\\Rightarrow 1\ h=\frac{360}{24}\\\Rightarrow 1\ h=15^{\circ}$

So, in 1 hour the Earth rotates 15 degrees. This means that a person would have to reset their watch by 1 hour after travelling 15 degrees

In 9 hours

$9\ h=9\times 15^{\circ}=135^{\circ}\\\Rightarrow 9\ h=135^{\circ}$

So, a person would have to travel 135 degrees in order to reset their watch by 9 hours.

7 0

3 years ago

A ball is thrown with an initial velocity of 20 m/s at an angle of 60° above the horizontal. If we can neglect air resistance, (

Neporo4naja [7]

Answer:

10 m/s

1.87914 s

18.7914 m

Explanation:

v = Initial velocity = 20 m/s

$\theta$ = Angle = 60°

Horizontal component is given by

$v_x=20cos60\\\Rightarrow v_x=10\ m/s$

The horizontal component is 10 m/s

y direction final displacement is zero

$s=vsin \theta t+\frac{1}{2}at^2\\\Rightarrow 0=20sin60+\frac{1}{2}\times 9.81\times t^2\\\Rightarrow t=\sqrt{\frac{2\times 20sin 60}{9.81}}\\\Rightarrow t=1.87914\ s$

The time the ball is in the air is 1.87914 s

Range is given is by

$R=vcos\theta t\\\Rightarrow R=10\times 1.87914\\\Rightarrow R=18.7914\ m$

The range is 18.7914 m

6 0

3 years ago

What is a cycle in nature that is a convection current?

kodGreya [7K]

The two largest natural cycles where convection currents occur are :

the movement of air in the atmosphere and

the movement of magma in the earth's mantle.

5 0

2 years ago

Read 2 more answers

Given: g = 9.8 m/s 2 . A small glass of water is placed on carousel inside a microwave oven, at a radius 6.5 cm from the center.

pashok25 [27]

Answer:

0.17 degrees

Explanation:

From the question we are given the following:

acceleration due to gravity = $9.8 \frac{m}{s^{2} }$

radius (r) = 6.5 cm = 0.065 m

time (s) = 9.3 s

angle = ?

we first have to calculate the distance the water moves, and this is the circumference of the microwave

circumference = 2 x π x r = 2 x π x 0.065 = 0.408 m

Now we find the speed with which it moves at

speed = $\frac{distance}{time}$

= $\frac{o.408}{9.3}$ = 0.044

The next step is to find the centripetal acceleration

a = $\frac{v^{2} }{r}$

= $\frac{0.044^{2} }{0.065}$ = 0.03

being a vector quantity, acceleration has direction, the centripetal acceleration is the x component while the y component would be the acceleration due to gravity (g)

A = 0.03 x + 9.8 y

to find the angle we can apply tan θ = $\frac{ 0.03 }{9.8$

θ = 0.17 degrees

7 0

3 years ago

He looks directly at the pen and can now see that it is

nasty-shy [4]

Answer:

Thanks to the rod and cone cells in our eyes, our brains can use light to build images. Recent studies identified a third type of cell that responds to light and dark. Three research groups have now confirmed that melanopsin is the pigment that this cell-type uses, opening possible avenues for treating blind people.

Explanation:

3 0

2 years ago

A material that lets electricity pass through it is called​

A material that lets electricity pass through it is called