PHYSICS HIGH SCHOOL

Find the percentage of the total work lost to friction if 28.7 J of work is put into pushing a block up a ramp resulting in 14.2 J of stored potential energy at the top.

Answers

Answer 1

Answer:

Answer:

14.5 joules

50.5 %

Explanation:

Energy initial +work= energy final

28.7 + work = 14.2

friction did - 14.5 joules of work so percantage of work lost is just 14.5/28.7 *100 or 50.5 %

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The process by which atoms are arranged to form a material with a crystal shape is called

Answers

Explanation:

The process by which atoms are arranged to form a material with a crystal shape is called crystallization.

With the help of crystallization process we can purify a solid compound.

For example, ice and snowflakes occur due to crystallization of water.

In this process, small quantity of desired solvent is added into the impure solid. Then it is heated to let the solid dissolve and after that it is cooled down so that crystals are formed. Then with the help of vacuum filtration pure solid is extracted.

Answer:

Crystallization is the correct answer.

Explanation:

When two point charges are a distance d apart, the magnitude of the electrostatic force between them is F. If the distance between the point charges is increased to 3d, the magnitude of the electrostatic force between the two charges will be

Answers

Answer:

The magnitude of the electrostatic force decreases by a factor 9

Explanation:

The electrostatic force between two charges is given by:

$F=k(q_1 q_2)/(d^2)$

where

k is the Coulomb's constant

q1 and q2 are the two charges

d is the distance between the two charges

We see that the magnitude of the force is inversely proportional to the square of the distance. If the distance is increased to 3d: d' = 3d, the new electrostatic force would be:

$F'=k(q_1 q_2)/((d')^2)=k(q_1 q_2)/((3d)^2)=(1)/(9) k(q_1 q_2)/(d^2)=(F)/(9)$

So, the electrostatic force decreases by a factor 9.

Decreased by a factor of 9

you toss a bowling ball straight up into the air with a speed of 2.1. how long does it take the bowling ball to reach its highest point?

Answers

I am going to assume 2.1 metres per second and that we're rounding acceleration due to gravity to -10 metres per second squared. At the highest point, velocity is going to be 0. v= intial velocity + acceleration*time, sub in 0 for velocity, 2.1 for initial velocity and -10 for acceleration to get 0= 2.1-10t. Now solve for t. t=0.21 seconds.

Answer:

0.2 s

Explanation:

Apex; good luck all! :)

What parts of an atom can change during a nuclear reaction that cannot change during a chemical reaction? Question 15 options: A. The number of protons and neutrons B. The number of electrons only C. The number of protons and electrons D. The number of neutrons and electrons

Answers

Answer;

B. the number of protons and neutrons

Explanation;

Nuclear reactions involve a change in the nucleus of an atom, usually producing a different element. Chemical reactions, on the other hand, involve only a rearrangement of electrons and do not involve changes in the nuclei.
Therefore the parts of an atom that can change during a nuclear reaction but can not change during a chemical reaction is the number of protons and neutrons that are found in the nucleus.

Neutrons and protons cannot be removed from nucleus from chemical reactions because they are strongly held together but nuclear reactions are strong enough to separate them. Hence option A is correct.

The four terrestrial planets that have solid, rocky surfaces areA. Mars, Venus, Earth, and Jupiter.
B. Mercury, Venus, Jupiter, and Mars.
C. Mercury, Jupiter, Saturn, and Mars.
D. Mercury, Venus, Earth, and Mars.

Answers

Mercury,Venus,Earth and Mars

Answer:

Mercury,Venus,Earth and Mars

Explanation:

Which element was discovered by joseph priestley to be what his contemporaries called ""dephlogisticated air""?

Answers

Answer:

oxygen

During his lifetime, Priestley's considerable scientific reputation rested on his invention of soda water, his writings on electricity, and his discovery of several "airs" (gases), the most famous being what Priestley dubbed "dephlogisticated air" (oxygen).

Explanation:

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