A water wave travels 36 meters in 15 seconds. What is the speed of the wave?540 m/s
2.4 m/s
0.42 m/s
1.9 m/s

Answers

Answer 1

Answer: Since the question above is looking for the SPEEd of the WAVE, the formula that should be used is SPEED = DISTANCE / TIME. You just need to substitute the distance (36 meters) and the time (15 seconds) to the formula. You should be able to get SPEED = 2.4 m/s.

Answer 2

Answer:

A water wave travels 36 meters in 15 seconds. What is the speed of the wave?

2.4 m/s

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In which of the following situations would the least work have been done?A. A 100-N force lifts an object 3 m.B. A 250-N force moves an object 1 m.C. A 25-N force moves an object 8 m.D. A 600-N force is applied to an object and moves it 0 m.

What does E=MC5, do you think einstein was correct or wrong,

Answers

Einstein's famous equation has a 2 in it, not a 5. It makes no difference what you, I, or anyone else 'thinks'. That equation has been proven correct in hundreds of experiments and thousands of observations and measurements since it was published. Among other things, it happens to be the reason why the sun shines.

A moving ball has what energy kinetic energy or elastic energy or both

Answers

A moving ball primarily has kinetic energy (motion).

Elastic energy comes into effect if the ball is compressed or stretched, like in the case of a bouncing ball.

Theoretical problems usually have perfect pr controlled conditions, but a moving ball in real life would be compressed or changing with its contact with the ground.

If you want more help or could provide more context, feel free to ask.

If this is a question on a test or quiz and its asking what type of energy a 'moving' ball has, generally they want you to think about what causes the movement (in this case, kinetic), because there is always a lot of other energy being transferred and happening at the same time (i.e., thermal, sound).

A 67.0 kg man sits in a 5.0 kg chair so that his weight is evenly distributed on the legs of the chair. Assume that each leg makes contact with the floor over a circular area with a radius of 1.10 cm. What is the pressure exerted on the floor by each leg?

Answers

Final answer:

The pressure exerted by each leg of the chair is calculated by dividing the total weight of the man and the chair (taken as a force) by the total surface area of the chair legs that is in contact with the floor.

Explanation:

To calculate the pressure exerted on the floor by each leg of the chair, we first need to calculate the total weight that the chair legs need to support. The total weight (w) is the weight of the man plus the weight of the chair, where weight is calculated as the mass multiplied by gravity (on Earth this is approx. 9.8 m/s²). So, w = (67.0 kg + 5.0 kg) * 9.8 m/s².

Next, we need to calculate the total area of all the chair legs in contact with the floor. Each leg makes contact over a circular area, the area of which (A) is calculated by 'πr²'. The total area then is 4 times this area (assuming the chair has four legs).

Pressure (P) exerted is the total force (F) applied, divided by the area (A) over which the force is distributed. Therefore the pressure exerted by each leg is the total weight divided by the total area.

Learn more about Pressure calculation here:

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Which of the following accurately describes properties of valence? A. The greater the number of electrons an atom has to borrow or to lend, the greater the activity of the atom.

B. Metals tend to have a negative valence and tend to be electron borrowers.

C. Nonmetallic elements tend to have a positive valence and tend to be electron borrowers.

D. The smaller the number of electrons an atom has to borrow or to lend, the greater the activity of the atom.

Answers

Answer: Option (D) is the correct answer.

Explanation:

According to the octet rule, in order to attain stability every atom requires to complete its octet by gaining or losing valence electrons.

The reactivity of an atom depends on the number of valence electrons. Smaller is the number of valence electrons to be gained or lose, the greater will be the activity of atom.

For example, atomic number of chlorine is 17 so, it just needs to gain one more electron to completely fill its shell. Whereas atomic number of aluminium is 13 so, it needs to lose 3 electrons in order to gain stability.

Thus, activity of chlorine atom will be more as compared to aluminium atom.

Thus, we can conclude that smaller the number of electrons an atom has to borrow or to lend, the greater the activity of the atom.

Answer: Option (D) is the correct answer.

Explanation:

Valence electrons are the electrons present in the outermost shell of an element.

For example, fluorine is a non-metal with atomic number 9. It contains 7 valence electrons and in order to attain stability it needs to gain only one electron.

Therefore, it is very reactive in nature. This also means that smaller is the electrons an atom needs to borrow or lend higher will be its reactivity.

Thus, we can conclude that the statement smaller the number of electrons an atom has to borrow or to lend, the greater the activity of the atom, accurately describes properties of valence.

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