PHYSICS HIGH SCHOOL

People in the United States know that water boils at 212°F. In Europe,people know that water boils at 100°C. Is the water in the U.S. different
than the water in Europe? What explains the two different temperatures?

Answers

Answer 1
Answer:
They are not two different temperatures.  They are two different
descriptions of the same temperature, using different-size degrees
and different scales.  A lot like "60 miles per hour" and "96.6 kilometers
per hour" ... the same speed. 

In the case of the temperatures, the tags " °F " and " °C " show that the
units are different.  And even though it's not obvious from the descriptions,
they also start counting at different temperatures.

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A wave a strong undertow. What kind of wave is it

Answers

Hey there! 

Answer: A swell

A wave which creates a strong undertow is called a swell. These types of waves are also known as surface gravity waves. 

Thank you!

A speedy rabbit is hopping to the right with a velocity of 4.0 \,\dfrac{\text m}{\text s}4.0 s m ​ 4, point, 0, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction when it sees a carrot in the distance. The rabbit speeds up to its maximum velocity of 13 \,\dfrac{\text m}{\text s}13 s m ​ 13, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction with a constant acceleration of 2.0 \,\dfrac{\text m}{\text s^2}2.0 s 2 m ​ 2, point, 0, start fraction, start text, m, end text, divided by, start text, s, end text, squared, end fraction rightward.

Answers

Answer: 38.25 m

Explanation:

In this situation we need to find the distance d between the rabbit and the carrot, and we can use the following equation, since the rabbit's acceleration is constant:

V^(2)=V_(o)^(2) + 2ad(1)

Where:

V=13 m/s is the rabbit's maximum velocity (final velocity)

V_(o)=4 m/s is the rabbit's initial velocity

a=2 m/s^(2) is the rabbit's acceleration

d is the distance between the rabbit and the carrot

Isolating d:

d=(V^(2)-V_(o)^(2))/(2a)(2)

d=((13 m/s)^(2)-(4 m/s)^(2))/(2(2 m/s^(2)))(3)

Finally:

d=38.25 m

Answer:

4.5s

Explanation:

Cause that's what it says on my test hints

on a small planet, an astronaut uses a vertical force of 175 newton to lift an 87.5 kg boulder at constant velocity to height of 0.350 meter above the planet's surface. What is the magnitude of the gravitation field strenght on the surface of the planet

Answers


                                                         Weight =  (mass)  x  (gravity)

                                                          175 N  =  (87.5 kg) x (gravity)

Divide each side by  87.5 kg :      Gravity = (175 N) / (87.5 kg)

                                                                      =  2 m/s²

We don't care how far he lifted it.

Explain why water boiling in a container stops
boiling momentarily when the lid is removed​

Answers

Answer:

It's because it tips over the threshold from nucleate boiling, which we can see, to convection boiling, which we can't. ... Even if the steam stayed in the pot, it would still stop boiling when you removed the heat. The steam and water in a liquid/vapour mixture are at the same temperature (100ºC).

Explanation:

A 70kg divers steps off of a 10m tower and drops from rest straight into the water. If he comes to rest 5m beneath the surface, determine the average resistance force exerted on him by the water.

Answers

Kinetic Energy:
K E= m g h
h = 10 m,  d = 5 m.
m g ( h + d ) - F d = 0
m g ( h + d ) = F d
70 * 9.8 * 15 = F * 5
10,290 = 5 F
F = 10,290 : 5
F = 2,058 N

First, we need to calculate the total distance that the diver travelled. The diver jumped off a 10-meter tower and went 5 meters under the water. Therefore, the total distance travelled by the diver is 10 meters (from the tower) plus 5 meters (underwater), which equals 15 meters.

Next, we will determine the work done on the diver. The work done is equal to the change in potential energy, which can be calculated by multiplying the diver's mass by gravity and then by the total distance the diver travelled. Given that the diver's mass is 70kg and the acceleration due to gravity is 9.8m/s², the work done is 70kg * 9.8m/s² * 15m, which equals 10290 Joules.

Finally, we'll find the average resistance force exerted on the diver by the water. The work done on the diver is also equal to the average force times the distance. Therefore, the average force is the work done divided by the distance. When you divide the work done (10290 Joules) by the total distance travelled (15 meters), you get an average force of 686 Newtons.

Hence, the total distance travelled by the diver in water is 5 meters, the work done on the diver is 10290 Joules, and the average resistance force exerted on the diver by the water is 2058 Newtons.

Learn more about Average resistance force exerted by water on a diver here:

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As the speed of a fluid increases, ____.a. the pressure decreases
c. the force decreases
b. the pressure increases
d. the volume decreases

Answers

The correct answer for the question that is being presented above is this one: "a. the pressure decreases." As the speed of a fluid increases, the pressure decreases." The relationship of the speed and the pressure is inversely proportional. As the pressure increases, the speed decreases.

I think the answer is A.
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