Ask question

Ask question

All categories

3 years ago

14

The geologic time scale originally ordered earth’s rocks by

1 answer:

Rasek [7]3 years ago

5 0

The geologic time scale originally ordered Earth’s rocks by relative age.

<u>Explanation:</u>

Geologic time scale is the measure of events occurred in year wise from the starting of universe. Mostly dating of rocks and fossil fuels are doing the trends still now. In order to measure the age of rocks, geological time scale have preferred relative age mode.

In this system, the age of rocks are measured and compared layer by layer. So the lowest layer of rock will be having the maximum age. As we don’t know the starting time of universe, so this method of comparison between the layers to order the rocks is best. So, depending upon the position of the rocks, the age can be determined.

You might be interested in

V = d/t please help with my physics question!

Assoli18 [71]

Answer:

313, 0.60 s

Explanation:

wavelength

= speed/frequency

= 340/520

= 0.6538 m

Number of wavelengths

= 205/0.6538

= <u>313</u> (whole number)

Time delay

= distance/speed

= 204/340

= <u>0.60 s</u>

7 0

3 years ago

If a machine has an efficiency of 40%, and you do 1,000 J of work on the machine, what will be the work output of the machine?

Nata [24]

Answer:

400 J

Explanation:

The efficiency of a machine is defined as

$\eta = \frac{W_{out}}{W_{in}}$

where

$W_{out}$ is the work output

$W_{in}$ is the work input

For this machine, we know the following

$W_{in} = 1000 J$ is the work in input

$\eta = 40\% = 0.40$ is the efficiency

Solving for the work output, we find

$W_{out} = \eta W_{in} = (0.40)(1000)=400 J$

5 0

3 years ago

of two long rods that are equivalent in every respect, except that one is fabricated from a standard material of known thermal c

iren2701 [21]

Answer:

Explanation:

Given the following ;

TA = 77°C and TB = 62°C at x1, KA = 180w/mk

Tb = 100°C and T[infinity] = 25°C

The two rods could be approximated as a fins of infinite length.

TA = 77 0C, θA = (TA - T∞) = 77 - 25 = 52 0C

TB = 62 0C , θB = (TB - T∞) = 62 - 25 = 37 0C

Tb = 100 0C , θb = (Tb - T∞) = (100 - 25) = 75 0C

KA = 180 W/m · K

T∞ = 25 0C

The temperature distribution for the infinite fins are given by ;

θ/θb =e^{-mx}

θA/θb= e-√(hp/A.kA) x1 ....................(1)

θB/θb = e-√(hp/A.kB) x1.......................(2)

Taking natural log on both sides we get,

In(θA/θb) = -√(hp/A.kA) x1 ...................(3)

In(θB/θb) = -√(hp/A.kB) x1 .....................(4)

Dividing (3) by (4) ;

[ In(θA/θb) / In(θB/θb)] = √(KB/KA)

[ In(52/75) / In(37/75)] = √(KB/180)

0.51834 = √(KB/180)

KB = 48.36W/m. K, Hence The thermal conductivity of the second material is KB = 48.36 W/m.K

3 0

4 years ago

A ball rolls from x=-9.8 m to x=11.0 m in 5 seconds. What was its average velocity?

alexdok [17]

Answer:

i think it is 0.24

Explanation:

8 0

4 years ago

Read 2 more answers

The power needed to accelerate a projectile from rest to its launch speed v in a time t is 42.0 W. How much power is needed to a

ExtremeBDS [4]

Answer:168 W

Explanation:

Given

Power needed $P=42 W$

initial Launch velocity is v

Energy of projectile when it is launched $E=\frac{1}{2}mv^2$

$Power=\frac{Energy}{time}$

$Power=\frac{E}{t}$

$42=\frac{\frac{1}{2}mv^2}{t}--------1$

Power when it is launched with 2 v

$E_2=\frac{1}{2}m(2v)^2=\frac{4}{2}mv^2$

$P=\frac{2mv^2}{t}---------2$

Divide 1 & 2 we get

$\frac{42}{P}=\frac{1}{2\times 2}$

$P=42\times 4=168 W$

7 0

3 years ago