PHYSICS HIGH SCHOOL

A speedboat initially at rest accelerates uniformly at 4.0 m/s (squared) for 7.0 s. How fast is the boat moving after 7.0 s?

Answers

Answer 1
Answer: Well if the boat initially at rest accelerates at uniformly at 4.0 m/s (squared) then it would be best to muitlply it so 4.0 squared equals 2 by multiplying that by 7.0 your answer would be 14 s

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COLLEGE

In a wire with a 1.35 1.35 mm2 cross-sectional area, 5.41 × 10 20 5.41×1020 electrons flow past any point during 2.19 2.19 s. What is the current in the wire?

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Answer:

The current in the wire = 39.53 A.

Explanation:

The given cross -sectional area of the wire  = 1.35 .

The number of electrons flowing in the wire at any point is  

= 5.41 electrons.

The charge of an electron is known to be  =

The electronics flow across the wire for a time of, t = 2.19 seconds.

The current in the wire  = (number of electrons) ×

                                       = 5.41 ×

                                       =  39.53 A.

The formula for current is actually, i =  .  

The (number of electrons )×(charge of an electron) will equal the total charge flowing through the wire in the given time  = 2.19 seconds.

The current in the wire = 39.53 A.

HIGH SCHOOL

Which of the following would be most likely to have monopoly power? A. a municipal water company B. a grocery store C. an online bookstore

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Answer:

The correct answer is option A.

Explanation:

Monopoly refers to the market situation where there are large number of buyers but a single seller. There is no close substitute of the product. There is a restriction on the entry of new firms and exit of existing firms in the market.

All these are applicable to municipal water company to a high degree.

There are a number of grocery stores in the market and there is no restriction on their entry and exit.

Similar is the case with an online book store.

So, the correct answer is a municipal water company.

COLLEGE

Is the air pressure above the roof higher or lower than the pressure inside the house? explain?

Answers

The air pressure above the roof is lower than the pressure
inside the house.

The original source of air pressure is just the weight of all the
atmosphere above the place where the pressure is measured. 

When the measurement is made from a higher location, there is
simply less atmosphere above, so less pressure.
MIDDLE SCHOOL

a croquet ball, after being hit by a mallet,slows down and stops. do the velocity and acceleration of the ball have the same signs

Answers

It depends. While slowing down acceleration will have negative sign but the velocity depends upon the initial point sonce velocity is a vector quantity if it is going back towards the initial position it will reduce but if it passes the initial position and goes back it will have negative sign....so it totally depends upon the situation.
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