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4 years ago

Scientists can find the absolute age of a rock by using

Physics

1 answer:

yaroslaw [1]4 years ago

6 0

Explanation:

Carbon-14 is normally used to date living organisms (all living things we know today contain mostly carbon). It can be used for samples up to about 60000 years old. Carbon-12 is the non-radioactive form that we encounter daily. Relative dating determines dates relative to each other, such as ordering of period or events.

Uranium 235 dating can determine date samples a million years old and up, so is more suited for rocks.

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An electric motor contains an electromagnet surrounded by a a magnet what is the function of an electromagnet in a motor

Sergio039 [100]

An electromagnet works or turns into a magnet when an electric current passes through it, causing it to produce a magnetic field. When they alternating current is passed through opposing pairs of magnets, a rotating magnetic field is created, which "induces" (creates) a magnetic field in the motor's rotor, causing it to spin.

4 0

3 years ago

Read 2 more answers

an astronaut on an eva has wandered dangerously far away from the shuttle. she has also exhausted all the fuel in her jet pack.

V125BC [204]

The conservation of the momentum allows to find the result of how the astronaut can return to the spacecraft is:

Throwing the thruster away from the ship.

The momentum is defined as the product of the mass and the velocity of the body, for isolated systems the momentum is conserved. If we define the system as consisting of the astronaut and the evo propellant, this system is isolated and the internal forces become zero. Let's find the moment in two moments.

Initial instant. Astronaut and thrust together.

p₀ = 0

Final moment. The astronaut now the thruster in the opposite direction of the ship.

$m_f$ = m v + M v '

where m is propellant mass and M the astronaut mass.

As the moment is preserved.

0 = m v + M v ’

v ’= $- \frac{m}{M} \ v$

We can see that the astronaut's speed is in the opposite direction to the propeller, that is, in the direction of the ship.

The magnitude of the velocity is given by the relationship between the masses.

In conclusion, using the conservation of the momentun we can find the result of how the astronaut can return to the ship is:

Throwing the thruster away from the ship.

Learn more here: brainly.com/question/14798485

5 0

2 years ago

an 80.0 kg astronaut carrying a 15.0 kg tool kit is drifting away from the space station at a speed of 1.25 m/s. a) if she throw

jasenka [17]

The final speed of the astronaut at the space station is 0.36 m/s and the direction will be opposite to the direction of the tool kit thrown.

The mass of the astronaut = 80 kg

The mass of the tool kit = 15 kg

The speed of the space station = 1.25 m/s

The speed of the tool kit threw = 6 m/s

The final speed of the astronaut can be found using the conservation of momentum formula,

$\displaystyle m_{1}v_{f1} + m_{2}v_{f2} = m_{1}v_{i1} + m_{2}v_{i2}$

where m₁ is the mass of the astronaut

m₂ is the mass of the tool kit

$\displaystyle v_{i1}$ and $\displaystyle v_{i2}$ is the speed of the space station

$\displaystyle v_{f1}$ is the speed of the astronaut after throwing the toolkit

Let us substitute the known values in the above equation, we get

(80 x $\displaystyle v_{f1}$ ) + (15 x 6) = (80 x 1.25) + (15 x 1.25)

(80 x $\displaystyle v_{f1}$ ) + 90 = 100 + 18.75

80 x $\displaystyle v_{f1}$ = 118.75 - 90

80 x $\displaystyle v_{f1}$ = 28.75

$\displaystyle v_{f1}$ = 28.75 / 80

= 0.36 m/s

Therefore, the final speed of the astronaut is 0.36 m/s

By newton's third law, for every action, there will be an equal and opposite reaction. Thus, the direction of the astronaut's direction will be against the direction of the tool kit thrown.

Learn more about the conservation of momentum in

brainly.com/question/2456421

#SPJ4

5 0

1 year ago

A time-dependent but otherwise uniform magnetic field of magnitude B0(t) is confined in a cylindrical region of radius 6.5 cm. I

sammy [17]

Answer:

Explanation:

Due to changing magnetic field , there will be emf induced in the region . EMF induced will create electric field which will be circular in shape and will be uniform along its circular path

The magnitude of circular electric field can be calculated as follows

We should apply Faraday law of electro magnetic induction

e = - dФ / dt = - ∫ E dl

Here Ф = π r² B

π r² dB / dt = - ∫ E dl

π r² dB / dt = E x 2π r

E = - r / 2 x dB / dt

For a circular electric field having a particular radius , magnitude of field will be constant .

The direction of electric field will be known by lenz's law

In the given case , magnetic field is upwards and it is reducing , therefore electric field induced will be such as to prevent this change of flux.

So electric field will be anticlock-wise . Hence direction of acceleration will also be anticlock-wise on proton at 1.5 cm from the centre.

3 0

3 years ago

a bulldozer pushed a large rock with a force of 5000 N at 2.0 m/s for 20s. how much work was done by the bulldozer

MArishka [77]

Answer:

It is 10KJoules

Explanation:

hope it helps

6 0

2 years ago