Give one example of a protista.

Answers

Answer 1

Answer: Plasmodium falciparum

Answer 2

Answer: Protista, now moving into the uni/multi cellular category,is well known for being called the junk drawer kingdom

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An element from group 2 will form ionic bonds with

Answers

An element from group 2 will form ionic bonds with a nonmetal group 13-17, therefore the correct answer is option C.

What is an ionic bond?

When electrons are moved from the atoms of one element to the atoms of another, creating positive and negative ions, ionic bonds are created. Ionic bonds are only between metals and non-metals occur. There can not be the formation of the ionic bond between two metals.

These ionic bonds are also known as electrovalent bonds as they are formed because of the transfer of the electrons.

There must be one electropositive element that can release electrons which is metal as metals have extra electrons in their valence shell.

There must be one electronegative element involved during the formation of the ionic bond, which is a nonmetal as nonmetals have few electrons left to complete their outermost shell.

As given in the problem element of group 2 are metals and will form ionic bonds with the nonmetal elements of the group 13-17.

Thus, the correct answer is option C.

Learn more about the ionic bond from here

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Answer:

Explanation:

it is c because I just took that test on Usa Test Prep and got a 100%

brainlest plz

1)A cyclist travels ¾ of a circular track from A to b as shown in figure. The radius of the circular track is 400 m. Calculate the displacement and distance travelled by the cyclist.PLEASE SHOW ALONG WITH STEPS(1)

2)Two objects having their masses 3:5 are acted upon by two forces.The forces are in the ration of 5:3. find the ration in their accelerations.

PLEASE SHOW ALONG WITH STEPS (2)

3) A man pushes a box of mass 50 kg with a force of 80 N. What will be the acceleration of the box due to the force? what would be the acceleration if the mass were doubled?

PLEASE SHOW ALONG WITH STEPS(3)

4) How does the force of gravitation between two objects change when the distance between them is reduced to half.

PLEASE SHOW ALONG WITH STEPS (4)

5) Explain what happens to the force between two objects if:
A) the mass of one object is doubled?
B) the distance between the object is tripled.

PLEASE SHOW ALONG WITH STEPS (5)

6)How will the equations of motion for an object moving with a uniform velocity change?

PLEASE SHOW ALONG WITH STEPS (6)

7)The force of attraction between two bodies is 20N. Calculate the force between them when mass of each body as well as the distance between them are halved.

PLEASE SHOW ALONG WITH STEPS(7)

Answers

1). Distance is the length of the path he traveled. That's 3/4 of the circle.

Displacement is the length between where he started and where he ended.
That's 1/4 of the circle.

The circumference of a circle is (2 pi) · (the circle's radius) .

2). Force = (mass)·(acceleration) F = M·A
This is a very important formula. You should memorize it.
Whenever you see a problem that has force, mass, and
acceleration in it, this is the formula you need.

If you need to find acceleration (like in this problem),
divide each side by (mass), and then you have

Acceleration = (force) divided by (mass) .

First object: Mass=3, Force=5. Acceleration= 5/3 .

Second object: Mass=5, Force=3. Acceleration= 3/5 .

The question is asking for the ratio of these forces.

3). Guess what !    F = M · A .

Divide each side by Mass, and then you have

   Acceleration = (force) divided by (mass)

   = (80 N) / (50 kg) = ?

If the mass were doubled, it would be

   (80 N) / (100 kg) = ?

4). The force of gravity changes opposite to the distance between
the objects. That's why the Earth pulls on us harder than Jupiter does.
The farther apart things are, the WEAKER gravity pulls them together.

How fast does the gravity force decrease ?
It decreases with the SQUARE of the distance.
That means . . .
-- If the distance changes to 3 times as far, the force becomes 1/3² = 1/9 .
-- If the distance changes to 2 times as far, the force becomes 1/2² = 1/4 .
-- If the distance changes to 1/3 as far, the force becomes (3²) = 9 .
-- If the distance changes to 1/2 as far, the force becomes (2²) = ?

5). A). The force of gravity increases as much as the PRODUCT of
the masses increases.
If one mass is B and the other mass is D, then the force calculation
has 'B·D' in it. If one of the masses doubles, then the calculation
has '2·B·D' in it. How much did the original force change ?

5). B). This was all covered in the discussion of #4).

6). 'Uniform velocity' means the object is moving in a straight line
with a constant speed. Its speed is not changing, and its direction
isn't changing either.
If a little tiny physicist is riding inside that object, there's NO TEST
he can do that can show him that he's moving. He has all of the SAME
laws of motion that any other physicist has, who's moving in any other
direction with any other constant speed.

7). Their masses are 'B' and 'D'. The original product is 'BD'.
When each mass is cut in half, they'll become B/2 and D/2.
Their product will become BD/4 .
That change alone will change the force to 1/4 of what it was originally.

If the distance between them is cut in half, then the force
changes to (2²) = 4 times what it was originally.

So the combined effect of all these changes at the same time
is that the new force is exactly equal to the original force.

Please help me with this. Finding speed.

Answers

What you need is a definition of average speed. Here it is:

   Average speed = (distance covered) / (time to cover the distance) .

For the race car in the question:

Average speed = (200 mile) / (2.5 hour)

   = (200 / 2.5) (mile/hour)

   =    80 miles per hour .

That doesn't seem all that fast for a race-car.
But the math is bullet-proof.

the speed is 80 m/h you find it by dividing the distance by time

Scientists studying a region in southern Florida have noticed drastic changes in the availability of freshwater. Which of the following probably did NOT contribute to these changes? A. Several years of declining rainfall B. Decrease in the population of pond plants C. Building of new homes in the area D. Construction of a dam on the local river

Answers

Answer:

C. Building of new homes in the area

I'm not totally sure but I think this is the best answer.

How do simple machines make work easier? A.
They add energy to the work.

B.
They increase the force needed to work.

C.
They reduce the speed of work.

D.
They increase the distance over which a force is applied.
C.?

Answers

Answer: D. They increase the distance over which a force is applied.

Explanation:

Simple machines are basic mechanical devices which make our work easier like lever, pulley, wheel and axle, inclined plane, wedge and screw. The magnitude of the force or direction is altered using a simple machine. They increase the distance over which a force is applied. They use mechanical advantage to increase the magnitude of the force.

It is A: They add energy to the work

Three students are pushing on a box. Under what conditions will the motion of the box change?

Answers

Answer:

The condition is that the force applied by the students must be higher than friction.

Explanation:

There are several deductions we could make. If the force applied by the students is less than friction, then the box won't change its state of motion, it will remain under equilibrium, because friction is a force that it's always opposite to any force applied, if the students are pushing forward, the friction will push back.

But, if the force applied by the students is higher than friction, the box will change its state of motion, it won't remain in equilibrium states and it will start to move.

Therefore, the condition is that the force applied by the students must be higher than friction.

The motion of the box can change if the force applied is greater than friction. Like it's accelerating due to the students' force on the box.

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