PHYSICS HIGH SCHOOL

Which of the following is not an example of work?A. raising a barbell over your head

B. picking up a box off the floor

C. holding a tray in the cafeteria line

D. pushing a box across the floor

Answers

Answer 1
Answer: The following which is not an example of work is C. holding a tray in the cafeteria line because if force displaces an object it should work. I think it's clear and I am pretty sure this answer will help you.

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a 0.40kg soccer ball approaches a player horizontally with a velocity of 18m/s north. the player strikes the ball and causes it to move in the opposite direction with a velocity of 22m/s. what impulse was delivered to the ball by the player?
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Do you know which component of the Star Wars movies is possible according to our current understanding of physics?

Answers

The space opera interstellar epic Star Wars uses science and technology in its settings and storylines, although its main focus is not necessarily on science. The component of the Star Wars movies which is possible according to our current understanding of physics is their interstellar travel.
The behavior of spacecraft engaged in battle is another aspect of the films is troubling the scientists. According to them,  when hit in space by a blaster, the crafts should continue moving in the same direction as the impact rather than falling downwards as the effects of gravity would not apply while in orbit. 

The apparent backward movement of a planet is calledA. heliocentric motion.
B. retrograde motion.
C. Kepler's first law of motion.
D. eccentricity.

Answers

The apparent backward movement of a planet is called B.retrograde motion.

♡♡Hope I helped!!! :)♡♡

When Earth and the Moon are separated by adistance of 3.84 × 10^8 meters, the magnitude of
the gravitational force of attraction between
them is 2.0 × 10^20 newtons. What would be the
magnitude of this gravitational force of attraction
if Earth and the Moon were separated by a
distance of 1.92 × 10^8 meters?
(1) 5.0 × 10^19 N (3) 4.0 × 10^20 N
(2) 2.0 × 10^20 N (4) 8.0 × 10^20 N

Answers

     Using the Universal Gratitation Law, we have:

F= (MmG)/(d^2) \n MmG=2*10^(20)*(3.84*10^8)^2 \n MmG=29.4912*10^36
 
     Again applying the formula in the new situation, comes:

F= (MmG)/(d^2) \n F= (29.4912*10^36)/((1.92*10^8)^2) \n \boxed {F=8*10^(20)}

Number 4

If you notice any mistake in my english, please let me know, because i am not native.

The strength of the gravitational forces between two masses is
inversely proportional to the square of the distance between them.

So if you change the distance to

               (1.92 x 10⁸) / (3.84 x 10⁸)  =  1/2

of what it is now, then you would change the force to

                     1 / (1/2)²  =  4

of what it is now.

   (4) x (2 x 10²⁰)  =  8.0 x 10²⁰ newtons .

If a material is ductile, it is most likely a ____________ . Question 24 options: A. Metalloid B. Noble Gas C. Non-Metal D. Metal E. Ion

Answers

Answer: Option (A) is the correct answer.

Explanation:

It is known that metals are malleable and ductile. Whereas non-metals are neither malleable nor ductile.

On the other hand, metalloids are the elements which contain properties similar to both metals and non-metals.

Therefore, if a material is ductile, it is most likely a metalloid because it is not necessary that ductility is a property shown by metals only.

Wherease like non-metals, noble gases are also neither malleable nor ductile.

A. Metalloid this is your answer plz click brainly-ist

A force of 20 N is executed to raise a rock weighing 30 N. What is the actual mechanical advantage?

Answers

i am absolutely sure its 1.5

1.5, because I said so.

what determines how atoms combine to form molecules? A. the arrangement of electrons B. the arrangement of nucleons C. the number of protons D. all of the above E. none of the above

Answers

The correct answer for the question that is being presented above is this one: "D. all of the above." The following determines how atoms combine to form molecules: the arrangement of electrons; the arrangement of nucleons; the number of protons
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