PHYSICS HIGH SCHOOL

An blank
Used to determine the change of an object

Answers

Answer 1
Answer: The acceleration is used to determine the change of an object.

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Earthquakes occur on the earth today, so we can assume they occurred in the past. Which important geologic principle does this sentence support?A. superposition
B. original horizontality
C. uniformitarianism
D. faunal succession

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the answer is c your welcome 
the answer is A superposition...........

The big bang theory suggests that the universe is about _____.300 million years old4.6 billion years old30 billion years old13 billion years old

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Answer:

13 billion years old

Explanation:

Big ban theory is the theory that explains the things occurred at the origin our our universe. It explains the movement of the galaxies It also tells us the age of our universe. According to this theory, our universe is 13 billion years old. The temperature of our universe was about 5.5 billion Celsius at the start of the universe.

13 billion years old

Suppose a yo-yo has a center shaft that has a 0.230 cm radius and that its string is being pulled.(a) If the string is stationary and the yo-yo accelerates away from it at a rate of 1.80 m/s2, what is the angular acceleration of the yo-yo in rad/s2? rad/s2.
(b) What is the angular velocity in rad/s after 0.750 s if it starts from rest? rad/s.
(c) The outside radius of the yo-yo is 3.10 cm.What is the tangential acceleration in m/s2 of a point on its edge? m/s2

Answers

Answer:

Part a)

\alpha = 782.6 rad/s^2

Part B)

\omega = 587 rad/s

Part c)

a_t = 24.3 m/s^2

Explanation:

Part a)

As we know that

a = R \alpha

so we will have

a = 1.80 m/s^2

R = 0.230 cm

\alpha = (a)/(R)

\alpha = (1.80)/(0.230 * 10^(-2))

\alpha = 782.6 rad/s^2

Part B)

Angular speed of the yo-yo

\omega = \alpha t

so we have

\omega = 782.6 * 0.750

\omega = 587 rad/s

Part c)

Tangential acceleration is given as

a_t = R \alpha

a_t = (3.10 * 10^(-2))(782.6)

a_t = 24.3 m/s^2

What is the power of a refrigerator with voltage 110 V and
current 0.8 A?

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Answer: 88

Explanation:

When two gears are mashed, the revolutions per minute (rpm) are inversely proportional to the number of gears

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Not exactly.  The RPM is inversely proportional
to the number of teeth on the gears.

Note that in order for them to stay meshed, that'salso going to work out
to be the ratio of their radii.  Otherwise they won't stay engaged.

The waste products of a nuclear fission powerplant can best be described asa. Small in quantity and not very dangerous.
b. Large in quantity and not very dangerous.
c. Large in quantity and very dangerously radioactive. Eliminate
d. Small in quantity and very dangerously radioactive.

Answers

The answer is D. small in quantity and very dangerously radioactive.
a.
 
-> the products are stable atoms with a much lower atomic number. For example, Uranium 238 commonly breaks down into strontium and xenon, both of which are stable and non-radioactive.

They are also low in quantity because of the precision involved in breaking down a large atom via neutron capture means that few fission reactions take place.

Hope I helped :)

Source: I studied nuclear physics in year 11
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