3 years ago

Where does a rider on a roller coaster get energy?

Physics

2 answers:

Annette [7]3 years ago

5 0

Gravitational potential energy.

As the rider falls, the GPE is converted into kinetic energy.

liraira [26]3 years ago

5 0

He gets it from the huge motor that lifts the cars and people to the top of the first hill and then let's them go.

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A 9.00 g bullet is fired horizontally into a 1.20 kg wooden block resting on a horizontal surface. The coefficient of kinetic fr

Zinaida [17]

Answer:

The initial speed of bullet is "164 m/s".

Explanation:

The given values are:

mass of bullet,

$m'=9.00 \ g$

or,

$=0.009 \ kg$

mass of wooden block,

$m=1.20 \ kg$

speed,

$s=0.390 \ m$

Coefficient of kinetic friction,

$\mu=0.20$

As we know,

The Kinematic equation is:

⇒ $v^2=u^2+2as$

then,

Initial velocity will be:

⇒ $u=v^2-2as$

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On substituting the given values, we get

⇒ $u=\sqrt{0-2\times 0.20\times 9.8\times 0.390}$

$=\sqrt{-1.5288}$

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As we know,

The conservation of momentum is:

⇒ $mu=m'u'$

or,

⇒ Initial speed, $u'=\frac{mu}{m'}$

On substituting the values, we get

⇒ $=\frac{1.20\times 1.23}{0.009}$

⇒ $=\frac{1.476}{0.009}$

⇒ $=164 \ m/s$

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Which one of the following statements is true concerning the magnitude of the electric field at a point in space? It is a measur

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Answer:

It is a measure of the electric force per unit charge on a test charge.

Explanation:

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Since we define electric field as the force per charge, it will have the units of force divided by the unit of charge. This implies that the SI unit of electric field is given as Newton/Coulomb (N/C).

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D lung cancer is not infectious

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Answer:

when they have the same slope

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