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
Dvinal [7]
3 years ago
11

Geological evidence based on several radiometric techniques has provided a scientifically well-accepted age for the Earth. Repre

sent that age of the Earth as the 100-yard length of a football field, and any time interval can be represented as some distance on the field. (So something that lasted one-tenth of the age of the Earth would be ten yards, and something that lasted one-half of the age of the Earth would be fifty yards.) On this scale, the time from when dinosaur extinction made space for large mammals, until today, would be represented by how far on the football field?
a. A little over 1 yard.
b. Over 90 yards.
c. 60 yards.
d. Over 80 yards.
e. 50 yards.
Physics
1 answer:
lidiya [134]3 years ago
3 0
Considering earth is 4.5 billion years old and dinosaurs only went extinct 66 million ago o would say Answer: A - a little over one yard
You might be interested in
Amount of force exerted on an object due to gravity is called
MAXImum [283]
The gravitational force between a mass and the Earth is the object'sweight. Mass is considered a measure of an object's inertia, and its weight is the force exerted on the object in a gravitational field. On the surface of the Earth, the two forces are related by the acceleration due to gravity: Fg = mg.

Hoped this helped!
6 0
3 years ago
A 4.9-MeV (kinetic energy) proton enters a 0.28-T field, in a plane perpendicular to the field. Part APart complete What is the
BartSMP [9]

Answer:

r=1.14m

Explanation:

\theta is the angle between the velocity and the magnetic field. So, the magnetic force on the proton is:

F_m=qvBsen\theta\\F_m=qvBsen(90^\circ)\\F_m=qvB

A charged particle describes a semicircle in a uniform magnetic field. Therefore, applying Newton's second law to uniform circular motion:

F_m=F_c\\qvB=F_c(1)

F_c is the centripetal force and is defined as:

F_c=m\frac{v^2}{r}

Here v is the proton's speed and r is the radius of the circular motion. Replacing this in (1) and solving for r:

qvB=\frac{mv^2}{r}\\r=\frac{mv^2}{qvB}\\r=\frac{mv}{qB}

Recall that 1 J is equal to 6.242*10^{12}MeV, so:

4.9MeV*\frac{1J}{6.242*10^{12}MeV}=7.85*10^{-13}J

We can calculate v from the kinetic energy of the proton:

K=\frac{mv^2}{2}\\\\v=\sqrt{\frac{2K}{m}}\\v=\sqrt{\frac{2(7.85*10^{-13}J)}{1.67*10^{-27}kg}}\\v=3.06*10^{7}\frac{m}{s}

Finally, we calculate the radius of the proton path:

r=\frac{mv}{qB}\\r=\frac{1.67*10^{-27}kg(3.06*10^{7}\frac{m}{s})}{1.6*10^{-19}C(0.28T)}\\r=1.14m

8 0
3 years ago
As Douglas considers his wife’s condition, he realizes that the change having the most impact is “the one that began to steal he
Tanya [424]
I believe that the loss of Phyllis' recollections is thought to be the most heartbreaking side effect of her ailment in light of the fact that once a man's memory scatters then piece of the individual begins to vanish with them. A memory holds a considerable measure of essential data, for example, people's identity, where They have lived, and their connections that they have had with individuals.
8 0
3 years ago
Not a question, but I need help on the last two questions I posted, preferably no links, please...
Andrei [34K]

Answer:

ok...

Explanation:

7 0
3 years ago
Read 2 more answers
Waves : Transfer of Energy
garri49 [273]

✒ Answer

In the case of still lake and ocean water how are they different in transferring energy from one location to another?

  • Answer:Energy is transferred in waves through the vibration of particles

In what direction will you move a rope to create transverse waves?

  • Answer: in the direction of the black arrow

In what direction will you move a slinky to create longitudinal waves?

  • Answer: parallel to the direction that energy is transported.

7 0
2 years ago
Other questions:
  • Two rods are made of brass and have the same length. The cross section of one of the rods is circular, with a diameter of 2a. Th
    7·2 answers
  • Pleaseeee help got this homework tomorrow ; if an object vibrates five times every second it has a frequency of ...?
    5·1 answer
  • According to the theory of plate tectonics, what drives the motion of the continents?
    5·2 answers
  • After the cart bounces, how far does it roll back up the ramp?
    12·1 answer
  • A 12 N force and a 21 N force are acting from a single point in opposite directions. What additional force must be
    8·1 answer
  • What causes a seismic wave?
    8·2 answers
  • 8th grade science help help
    9·1 answer
  • Which of the following is NOT a product of science?
    13·2 answers
  • Classify each of the following hydro carbons as alkane,alkene or alkyne
    13·1 answer
  • What is the frequency of a wave that has a period of 5 seconds
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!