1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Nataly [62]
2 years ago
7

1) Archeologists have found fossil remains of some of the first land

Physics
1 answer:
dimaraw [331]2 years ago
3 0

Answer: Carbon 14 and Uranium 238 are not used together to determine fossil ages.

Explanation:

Carbon 14 with a half life of 5,700 years can only be used to date fossils of approximately 50,000 years. Most fossils are thought to be much older than 50,000 years. Also most fossils no longer contain any Carbon. The fossilized remains have been mineralized where the original organic material has been replaced and turned into stones containing no carbon.

Uranium 238 has a half life of 4.5 billion years. Uranium can be used to date the age of the earth. If 50% of pure uranium' is left in a sample the sample is assumed to be 4.5 billion years old.( This is assuming that the original sample was 100% uranium and no Uranium 238 has been eroded or lost in 4.5 billion years old. If a fossil has only 25 % of the Uranium 238 the sample has an estimated age of 3.2 Billion years. This would be the estimated age of the earliest life or formation of fossils.

Note no fossils contain Uranium 238. Uranium 238 is only found in igneous or volcanic rocks. So no fossils can be dated directly using U 238.

Because of the huge differences in the half lives of Carbon 14 and Uranium238 they cannot be used together. Carbon 14 can only be used to date fossils of a very recent age. Uranium 238 can only be used to date volcanic rocks of a very old age.

You might be interested in
Answer all of these questions and you will get the brainlist
Rina8888 [55]
7) PE= Fwh = (72 m) (966 N) = 69552 Joules 7
8) zero PE=mass*g*height
I hope it’s correct
6 0
2 years ago
(1) Which appliance is designed to transfer electrical energy to kinetic energy?
sweet-ann [11.9K]

Answer:

bb kettle

Explanation:

it transfres electricsl to kinetic

8 0
3 years ago
Explain why you cannot use mass or volume alone to identify substances.
Alex17521 [72]
Objects can have the same mass (but different <span>compositions). Only mass or volume cannot tell you if the object is solid or vo</span>lumes) or same volume (but different masses) 

4 0
3 years ago
• ALWAYS use significant figure rules. Remember that these rules apply to all numbers that are measurements.
nignag [31]

Answer:

45.6 m at 80.5^{\circ} south of west

Explanation:

Let's take the north-south direction as y-direction (with south being positive) and east-west direction as x-direction (with west being positive). Therefore, the two components of Cody's motion are:

- d_y = 45.0 m (south)

- d_x = 7.50 m (west)

Since they are perpendicular, the magnitude of the net displacement can be calculated by using Pythagorean's theorem:

d=\sqrt{d_x^2+d_y^2}=\sqrt{7.50^2+45.0^2}=45.6 m

The direction instead can be measured as follows:

\theta = tan^{-1} (\frac{d_y}{d_x})=tan^{-1}(\frac{45.0}{7.50})=80.5^{\circ}

And given the convention we have used, this angle is measured as south of west.

5 0
3 years ago
Explain why sugar was used in this experiment. How does the experiment relate to a baker adding yeast to bread to make it rise?
tia_tia [17]

Answer:

Yeast can use oxygen to release the energy from sugar (like you can) in the process called "respiration". ... So, the more sugar there is, the more active the yeast will be and the faster its growth (up to a certain point - even yeast cannot grow in very strong sugar - such as honey).

7 0
2 years ago
Other questions:
  • A bullet is fired horizontally with an initial velocity of 144.7 m/s from a tower 11 m high. if air resistance is negligible, wh
    10·1 answer
  • Calculate the potential difference across a 25- resistor if a 0.3-A current is flowing through it.
    6·2 answers
  • What is Newtons laws​
    7·1 answer
  • How do the properties of an electromagnetic wave change as a result of increasing the period of the wave?
    11·1 answer
  • PLEASE HELPPPP THANK YOUUUU!!!
    12·1 answer
  • What is the current produced by a potential difference of 200V through a resistance of .2 ohms?
    12·1 answer
  • Randy used to have poor health. Recently, he has lost a lot of weight and has started feeling much better, but he doesn't know w
    13·2 answers
  • Calculate the force applied (in newtons) if a pressure of 2000Pa is acting on an area of 3m2.
    10·1 answer
  • Which statement best describes a chemical reaction?​
    6·2 answers
  • Please give an answer that is coherent
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!