Answer:
Once the weighted end of the pendulum is released, it will become active as gravity pulls it downward. Potential energy is converted to kinetic energy, which is the energy exerted by a moving object. An active pendulum has the most kinetic energy at the lowest point of its swing when the weight is moving fastest.
Explanation:
A body revolving in circle generally has tangential acceleration if the speed is changing. Since the speed is uniform here, the tangential acceleration is zero.
centripetal acceleration is directed towards the center and is given as
a = v²/r where a = centripetal acceleration , v = speed , r = radius
Since both speed and radius are constant here, the centripetal acceleration is constant and is always directed towards the center.
hence the correct choice is
The acceleration is directed toward the center.
B. The evidence helps scientists come up with explanations about
the natural world.
C. The evidence proves that scientists are always right.
D. The evidence supports scientists' personal opinions about politics.
SUNT
Answer: B
The evidence helps scientists come up with explanations about
the natural world.
When making a research, scientists use the scientific method to collect enough evidence in an experiment related to a hypothesis, the results aiming to support or contradict a theory.
Compared to the sound waves detected by the
driver of the truck, the sound waves detected by
the observer have a greater
(1) wavelength (3) period
(2) frequency (4) speed
Answer: The correct option is (2).
Explanation:
Doppler effect is the phenomenon in which the frequency of the wave increase or decrease when there is relative motion between the source and the listener. There is an apparent change in the frequency.
When the source and the listener are approaching each other then there will be increase in the frequency.
When the source and the listener are moving away form each other then there will be decrease in the frequency.
In the given problem, Sound waves are produced by the horn of a truck
that is approaching a stationary observer. The sound waves detected by the observer have greater frequency.
Therefore, the correct option is (2).
b. digestion
c. polymerization
d. exchange of ions between two compounds
b. chronology.
c. discovery.
d. use and applications.
b. scattering.
c. reflection.
d. absorption.
The blue color of the sky is the result of scattering. The answer is letter B. it is specifically called the Rayleigh scattering. This blue color is the result of the incoming rays of the Sun into the earth’s atmosphere. It has he lowest wavelength which as we all see is the blue spectrum of light.