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3 years ago

11

What type of energy goes in the blank: The pencil sharpener gets very warm on days when many students need to sharpen their penc

ils.
Electrical energy then ______________ energy then heat energy

1 answer:

egoroff_w [7]3 years ago

4 0

Chemical energy because it transfer to the pencil

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La velocidad de la luz en el vacío es c= 3000.000 km\s la luz del sol tarda en llegar a la tierra 8 minutos y 14 segundos

ehidna [41]

La velocidad correcta de la luz en el vacío es 300.000 km/s .

La distancia = (velocidad) x (duración de tiempo)

Duración de tiempo = 494 segundos, porque cada minuto = 60 segundos

La distancia = (300.000 km/s) x (494 s)

<em>La distancia = 148.200.000 km</em>

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4 years ago

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Answer:

A

Explanation:

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3 years ago

Which model would be classified as a physical model

kumpel [21]

Answer:

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3 years ago

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A student pulls on a cart and applies a 20N force at an angle of 25 degrees above the horizontal to

Nady [450]

Answer:

W = 181.26 J

Explanation:

Given that,

The force acting on the cart, F = 20 N

It is at an angle of 25 degrees above the horizontal to move a crate a distance of 10m across the floor.

We need to find work done by the student. The work done by the student is given by :

$W=Fd\cos\theta\\\\W=20\times 10\times \cos25\\W=181.26\ J$

So, the required work done is 181.26 J.

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3 years ago

A car moves at speed v across a bridge made in the shape of a circular arc of radius r. (a) Find an expression for the normal fo

inna [77]

Answer:

(a) FN = m (g - $\frac{v^{2} }{r}$ )

(b) vmin = 17.146 m/s

Explanation:

The radius of the arc is

r = 30m

The normal force acting on the car form the highest point is

FN = m (g - $\frac{v^{2} }{r}$ )

If the normal force become 0 we have

m (g - $\frac{v^{2} }{r}$ ) = 0

or

g - $\frac{v^{2} }{r}$ = 0

This way, when FN = 0, then v = vmin, so

g - $\frac{vmin^{2} }{r}$ = 0

vmin = $\sqrt[.]{g*r}$ = $\sqrt[.]{9.8 m/s^{2} * 30m } = 17.146 m/s$

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4 years ago