PHYSICS MIDDLE SCHOOL

What is the term that we use to describe two species living together?A. Camouflage
B. Hibernation
C. Migration
D. Symbiosis

Answers

Answer 1
Answer: D. Symbiosis.  Camouflage is a creature disguising itself as its surroundings.  Hibernation is a animal sleeping for an extended period of time when food is scarce to conserve energy.  Migration is an animal moving from one place to another when food is scarce in the first area so it can find more food in the new area.  Symbiosis is two animals living together and helping each other live.

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In which of these situations, is mechanical energy being conserved? (Neglect, air resistance, friction and breaking) Check all that apply.Child on a swing


Pendulum


Bow and Arrow


Roller Coaster

Answers

Answer:

Neglecting, air resistance, friction and breaking, all the condition has conservation of mechanical energy.

Explanation:

  • The law of conservation of mechanical energy suggests that the mechanical energy in a locked system with out any destructive forces like friction or air resistance remains always the same (constant).
  • The energy may be converted between kinetic energy, potential energy, gravitational potential but energy do not get decreased in any cases as mentioned in the option.
  • So all the cases mentioned above shows the conservation pattern of mechanical energy.

What happens to the ratio when an excess quantity of a reactant exists?

Answers

The ratio will remain the same and the and the extra reactant will just be left.

Hope I helped !

What is the voltage in a circuit if the current is 6.2 A and the resistance is 18 ohms

Answers

We already know the formula:
Voltage = Current * Resistance
In the given question, there are numerous information's that are already given.
Current = 6.2 A
Resistance = 18 ohms
Then
Voltage = 6.2 * 18 Volts
             = 111.6 Volt
So, the voltage in the circuit will be 111.6 volts. I hope it helps you.

If you are doing a USA TEST Prep:

D)  111.6 V

Which stream has the greatest potential energy on the top: stream with steeper slope or stream with gentle slope?

Answers

i think the stream with the steep slope but i'm not entirely sure.

Draw a vector for a force of 69 N @ 76 degrees

Answers

Answer:

The force is shown in the figure below which is 69 N at 76° from the positive x-axis

there are two component  Fx and Fy which are in the direction of x-axis and y-axis.

76=\sqrt{Fx^(2) +Fy^(2) }

Give two reasons why we feel earths gravity more strongly than the moons gravity

Answers

Answer:

Explanation:

The force of gravity is the physical force exerted by the mass of a planet on the objects that are within its gravitational field. In other words, this law establishes that bodies, by simply having mass, experience a force of attraction to other bodies with mass.

The force of gravity depends on the mass of each object. The force with which two objects are attracted is proportional to their mass and decreases rapidly with distance:

F=G*(m1*m2)/(r^(2) )

where G is the universal gravitation constant, whose value is

G=6.673*10⁻¹¹ (N*m^(2) )/(kg^(2) )

This expression indicates that the gravitational force that a point mass M exerts on another point mass m that is at a distance r from the previous one is directly proportional to the product of the masses and inversely proportional to the square of the distances that separates them.

Given the above, it is possible to say that two reasons why we feel the Earth's gravity more strongly than the moon's gravity are:

  • Being the mass of a person the same, the mass of the Earth is greater than the mass of the Moon
  • The distance r between the Earth and us is much closer than the distance r between the Moon and us (remember that the Earth exerts its force of gravity from the center)

This causes the force exerted by the Earth on us to be much greater.

1).  The Earth has about 80 times as much mass as the Moon has.

2). The Earth is closer to many of us than the Moon is.

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