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3 years ago

Which object would a geologist date using carbon-14 dating?

Physics

2 answers:

vovikov84 [41]3 years ago

8 0

Answer:

Explanation:

Anettt [7]3 years ago

6 0

Answer:

B.) A woolly mammoth fossil

Explanation:

Carbon-14 dating is normally used to find the age of a once-living object.

C and D are not accurate because they both refer to types of igneous rocks -- only sedimentary rocks can be used for Carbon Dating.

A isn't accurate because dinosaurs lived a <em>very, very long</em> time ago, therefore, the isotopes wouldn't be detectable during modern times.

Though woolly mammoths lived a long time ago, it is a short time compared to the long time gap between dinosaurs and modern era. Radioactive isotopes may still be present in a woolly mammoth fossil sample.

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At what speed, as a fraction of c, does a moving clock tick at four fifth the rate of an identical clock at rest?

ololo11 [35]

Answer:

The seed as a fraction of the speed of light is $\frac{3}{5}c$

Solution:

As per the question:

Suppose, $t_{i}$ be the rate of an identical clock between two time intervals.

For a moving clock, moving with velocity 'v', at the clock tick of four-fifth:

t = $\frac{5}{4}t_{i}$

Now,

Using the relation of time dilation, from Einstein's relation:

$t = \frac{t_{i}}{\sqrt{1 - \frac{v^{2}}{c^{2}}}}$

$\frac{5}{4}t_{i} = \frac{t_{i}}{\sqrt{1 - \frac{v^{2}}{c^{2}}}}$

Squaring both sides:

$(\frac{5}{4})^{2} = (\frac{1}{\sqrt{1 - \frac{v^{2}}{c^{2}}}})^{2}$

$\frac{25}{16} = \frac{1}{{1 - \frac{v^{2}}{c^{2}}}}$

$1 - \frac{16}{25} = \frac{v^{2}}{c^{2}}$

$\frac{v}{c} = \sqrt{\frac{9}{25}}$

$\frac{v}{c} = \frac{3}{5}$

$v = \frac{3}{5}c$

6 0

3 years ago

A toy car runs off the edge of a table that is 2.225 m high. If the car lands 0.400 m away from the base of the table, how fast

ruslelena [56]

Answer:

0.594 m/s

Explanation:

First, find the time it takes to land.

Given, in the y direction:

Δy = 2.225 m

v₀ = 0 m/s

a = 9.8 m/s²

Find: t

Δy = v₀ t + ½ at²

(2.225 m) = (0 m/s) t + ½ (9.8 m/s²) t²

t = 0.674 s

Next, find the horizontal velocity.

Given, in the x direction:

Δx = 0.400 m

a = 0 m/s²

t = 0.674 s

Find: v₀

Δx = v₀ t + ½ at²

(0.400 m) = v₀ (0.674 s) + ½ (0 m/s²) (0.674 s)²

v₀ = 0.594 m/s

8 0

3 years ago

If you make multiple measurements of your height, you are likely to find that the results vary by nearly half an inch in either

Verdich [7]

Answer:

Height h= 1.7 m

Explanation:

Supposing we have to find height in meter.

1 feet = 0.3048 m

1 inch = 0.0254 m

Given that:

5 feet

= 5×0.3048

= 1.524 m

and 7 inch = 7×0.0254= 0.1778 m

Therefore total height of a man in meter

5 feet 7 inch = 1.5424+0.1778 =1.7 m

Height h= 1.7 m

3 0

4 years ago

The direction that an induced current flows in a circuit is given by

AURORKA [14]

Answer:

Lenz's law

Explanation:

it states that induced emf of different polarities induces a current whose magnetic field opposes the change in magnetic flux through the coil in order to ensure that original flux is maintained through the coil when current flows in it.

according to Faraday' s law of electromagnetic induction

Where -ve sign due to lenz's law

Emf is the induced voltage also known as electromotive force

N is the number of loops.

dϕ Change in magnetic flux.

dt Change in time.

8 0

3 years ago

a quantity of water is poured into a graduated cylinder, which reads 139 mL. what is the mass of the water in kilograms?

alexgriva [62]

The mass of water is 0.139 kg

Explanation: