PHYSICS HIGH SCHOOL

1. -------- of an object is the change in velocity per unit time.a) Displacement b) Acceleration c) Average velocity d) Angular velocity.
2. The motion of freely falling body is an example of ----- motion.
a) Uniform motion b) Non -uniform motion c) Uniformly accelerated motion. d) None of these.

Answers

Answer 1
Answer:

Answer:

A

Explanation:

acceleration is defined as the rate of change of velocity with time

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A bicyclist travels the first 700 m of a trip at an average speed of 8 m/s, travelsthe next 600 m in 90 s and the last 50s at a speed of 21 m/s. Find the average speed
of the bicyclist for this trip

Answers

Answer:

500

Explanation: its 500 because you can also just search for it

scientists hypothesize that oxygen began to accumulate in earth's atmosphere of living things with the ability to?

Answers

According to geological data, oxygen production by photosynthetic microbes began about 2 billion years ago. This made it possible for oxygen to build up in the atmosphere, which eventually led to a switch from reducing to oxidizing circumstances.

What accumulates in earth's atmosphere of living things?

A basic type of bacteria eventually evolved that could survive by using the energy from the Sun and the carbon dioxide in the water to produce oxygen as a byproduct. As a result, the atmosphere started to fill up with oxygen as carbon dioxide levels were falling.

Cyanobacteria underwent a stunning transformation at least 2.4 billion years ago, which was made possible by their evolution.

They evolved into the earliest photo-synthesizers on Earth, producing food out of water and solar energy, while also releasing oxygen in the process.

Therefore, living beings were able to breathe because of the oxygen in the early atmosphere.

Learn more about earth's atmosphere here:

brainly.com/question/13154099

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The oxygen in the early atmosphere enabled living things to breathe.

Entropy is closely related to thea. second law of thermodynamics.
b. first law of thermodynamics.
c. both of the above
d. none of the above

Answers

The answer is A. Second law of thermodynamics.

The second law of thermodynamics states that entropy must increase in order for irreversible thermodynamic processes to occur. In idealized processes, the entropy is constant. This follows the principle that entropy always increases due to the natural disorder and randomness of processes.

a boy runs from his house to school at speed 5m/s on a straight road and returns with speed of 10m/s.The distance between the house and school is 100m. Find his average velocity.... with explaination please​

Answers

Explanation:

time spent to run from house to school=100/5=20s

time spent to return from school=100/10=10s

average velocity=200m/(10+20)

  • =6.66m/s

A typical carbon atom has six protons, six neutrons, and six electrons. Which of these has the least amount of mass?A) one Proton
B) one Neutron
C) six Electrons
D) These masses are too tiny to measure

Answers


One proton or one neutron have very close to the same mass.

Their mass is about the same as the mass of 1,840 electrons !
So six electrons have roughly the same mass as 0.0033 of one
proton or one neutron.

Yes, these masses are very tiny.  None of them was ever measured
until the 20th Century.  But all of them have now been measured,
very precisely and accurately.  This is very impressive, and should
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It would be very interesting to look around online and find out
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How much force is needed to accelerate a 1000-kg car at a rate of 3 m/s2

Answers

In the given question we already know the mass of the car. The mass of the car is 1000 kg. The acceleration at which the car needs to reach is 3 m/s^2. Based on these information's, the required answer can be easily deduced. We already know that
Force = Mass * Acceleration
           = (1000 * 3) newton
           = 3000 newton
So the amount of force that is required to move give the car an acceleration of 3m/s^2 is 3000 Newton.
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