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ELEN [110]
3 years ago
7

How do we determine the age of rocks and other geologic features?

Physics
1 answer:
Mamont248 [21]3 years ago
4 0

Answer:To establish the age of a rock or a fossil, researchers use some type of clock to determine the date it was formed. Geologists commonly use radiometric dating methods, based on the natural radioactive decay of certain elements such as potassium and carbon, as reliable clocks to date ancient events.

Explanation:

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A rat receives food when it lever presses in the presence of a 1100 Hz tone, but not in the presence of a 1300 Hz tone. The 1100
Paladinen [302]

Answer:

1100 Hz is a discriminitive stimulus signal (SD), while 1300 Hz is a discriminitive stimuli for extinction (S∆ )

Explanation:

This is used to describe Discrimination Training  in learning and behavior. The 1100 Hz is a discriminitive stimulus signal (SD), while 1300 Hz is a discriminitive stimuli for extinction (S∆ )

3 0
4 years ago
Câu 1. Con lắc lò xo treo thẳng đứng, dao động điều hòa với biên độ 2cm và tần số góc 20 rad/s. Chiều dài tự nhiên của lò xo là
natka813 [3]

Answer:

28 cm and 32 cm

Explanation:

1. The spring pendulum hangs vertically, oscillates harmonic with amplitude 2cm and angular frequency 20 rad/s. The natural length of

a spring is 30cm. What is the minimum and maximum length of the spring during the oscillation? Take g = 10m/s2.

As the amplitude is 2 cm and the natural length is 30 cm. So, it oscillates between 30 -2 = 28 cm to 30 + 2 = 32 cm.

So, the minimum length is 28 cm and the maximum length is 32 cm.

8 0
3 years ago
18°C = _____ <br>-255 K<br> 0 K <br>18 K <br>291 K
Nadya [2.5K]

18°C answer is 291 k

hope it help

4 0
3 years ago
Read 2 more answers
What is the initial velocity of a go-kart traveling at a uniform acceleration of 0.5 m/s^2 for 5s as it slows down to a stop?
Arlecino [84]

The go-kart's velocity v after time t is given by

v=v_0+at

where v_0 is its initial velocity and a is its acceleration. After t=5\,\mathrm s, the go-kart stops completely, so

0\,\dfrac{\mathrm m}{\mathrm s}=v_0+\left(-0.5\,\dfrac{\mathrm m}{\mathrm s^2}\right)(5\,\mathrm s)\implies v_0=2.5\,\dfrac{\mathrm m}{\mathrm s}

where a because we know the go-kart is slowing down.

7 0
3 years ago
Jack underwent radiation therapy using a beam of neutrons to treat a skin cancer on his hand. He received a dose equivalent of 1
DENIUS [597]

Answer:

Explanation:

a.) Dose equivalent is:

H= wD\\D=\frac{H}{w} =\frac{1.6}{8}=0.2Gy

b.) D=\frac{E}{m}\\E=mD=(22\times 10^{-3}\times0.2)=4.4\times 10^{-3}J

c.) The dose equivalent is:

H=wD=1.5 \times 0.2=0.3Sv

8 0
3 years ago
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