PHYSICS MIDDLE SCHOOL

Which of the following answers describe how to calculate the acceleration of an object? A. Divide the change in the objects velocity by the time it takes to make that change.
B. Divide the time the object travels by the distance it travels.
C. Calculate the distance the object travels and divide that by the time it takes to get there.
D. Calculate the velocity of an object and divide that by the time the object is in motion.

Answers

Answer 1
Answer:

A. Divide the change in the objects velocity by the time it takes to make that change.

Explanation:

Acceleration is a vector quantity whose magnitude is given by the following equation:

a=(\Delta v)/(\Delta t)

where

\Delta v is the change in velocity of the object

\Delta t is the time it took to make the change in velocity

Therefore, we see that this equation corresponds to choice A.
Answer 2
Answer: I think it's A I hope this is right but I just studied this so I think this is the right answer

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Why is water considered to be a complex compound
Answer my question plzz !!any body
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Please help ASAP...A satellite takes 24 hours to complete one orbit whilst travelling at a speed of 12 km/s. at what height above the earth is the satellite orbiting. Thank you :)

Answers

By mentioning space, satellites, and orbits, the question is trying to convince you that your brain can't operate because there is no oxygen. Try thinking about the question this way: If it takes you 24 hours to travel around a circle, at the speed of 12 km/sec, then what's the radius of the circle ?

Vince is baking a cake. He pours flour and sugar into an empty bowl. The substance in the bowl is a(n) __________.a)atom.
b)element
c)mixture.
d)compound.

Answers

Answer: c) mixture.

Explanation:

An atom is the smallest entity of any substance which consists of subatomic particles called as neutrons, protons and electrons.

An element is a pure substance which is  composed of atoms of similar elements. Example: H_2  

Mixture is  formed when atoms of similar or different elements are mixed in no fixed ratio without any chemical combination.

A compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.  Example: H_2O
It is 'C', a mixture, because flour and sugar are both a compound.

Freshwater leeches attach to fish and suck blood from the fish to extend periods of time. This results in sores on the fish that often become infected . This relationship is best described as?

Answers

Answer:

Parasitism.

Explanation:

Parasitism, in biology, is defined as a relationship between different species, formed by a parasite and a host. So, basically the parasite lives in or on the host, causing it harm. Parasites can be describe as predators that eat less than one prey unit, that is, they feed them selves slowly, they don't kill the prey instantly as actual predators do.

So, in this case, we are talking about leeches, which are defined as parasitic worms which lives in freshwater environments. They feed themselves by sucking blood from the host.

Therefore, the relation between these two species is Parasitism.
parasitism i think  because they dont feed of dead animals or it would be predation

A stress is considered a "bad" stress when it A. cannot be eliminated. B. keeps a person from feeling good. C. challenges a person to do better. D. doesn't lead to a productive end.

Answers

The answer is either c or d

Is eating a sandwich 100% efficient

Answers

Not always. It really depends on what part are you asking about
No. When eating, some of the energy of the food is converted to heat. In general, real life situations are not 100% efficient.

a rectangular coil of 25 loops is suspended in a field of 0.20wb/m2.the plane of coil is parallel to the direction of the field the dimensions of the coil are 15cm perpendicular to the field line and 12cm parallel to them what is the current in the coil if there is a torque of 5.4N.M acting on it​

Answers

Answer:

The current in the coil is 60 Ampere.

Explanation:

Given:

Number of turns in the coil is N = 25

Dimension of the coil = 15cm X 12cm

magnitude of magnetic field = 0.20T

angle in the xy plane is θ = 0 degree

torque τ = 5.4 N-m

To find:

current in the coil is i = ?

Solution:

The torque acting on the coil is given by

=> \tau = NiAB cos\theta

Converting cm to m

12 cm = 0.12 m

15 cm = 0.15 m

The area of the coil is  

A = 0.12 X 0.15

A = 0.018 m^2

Substituting the values

=>5.4 = 25* i * 0.018 * 0.20 * cos\theta

=>5.4 = 25* i * 0.018 * 0.20 * cos(0)

=>5.4 = 25* i * 0.018 * 0.20 * 1

=>5.4 = 25* i * 0.018 * 0.20 * 1

=>5.4 = 0.09* i

=>i = (5.4)/(0.09)

=> i = 60 A
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