Answer:
I think its b lol correct me if I'm wrong
Answer: 80 s
Explanation:
Speed is expressed in v= d/t, derive the equation so we can have time.
First conert km into meters to cancel out both units and only seconds will remain.
1.2 km x 1000m/ 1km = 1200 m
t = 1200 m /15 m/s = 80 s
Answer:
D) No, because of the way work is defined
Explanation:
The work done on an object is given by:
where
F is the force applied on the object
d is the displacement of the object
is the angle between the direction of the force and the displacement
From the formula, we observe that if there is no motion involved, then the displacement of the object is zero:
d = 0
As a result, the product in the formula is also zero, therefore the work done will be zero as well.
The age of earth is b) 4.5 million years old
It is believed that earth is 4.5 million years old.
The radiometric age dating of earth meteorite content specifies the earth to be 4.5 million years old.
The formation of Earth is believed to have started shortly after the meteorites and nutrient inclusions were formed. It is challenging to differentiate between the ages of Earth and the oldest rocks since the duration of this accretion process is yet uncertain, and estimates from various accretion theories range from a few million with about 100 million years.
The oldest rocks on Earth that are visible at the surface are groupings of minerals, making it difficult to determine their exact age.
Due to the chemical makeup of rock minerals, some elements are found but not others; yet, in sedimentary deposits radioactive isotopes, the radioactive decay process over path to a successful strange elements.
Learn more about Earth here, brainly.com/question/12041467
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