Question

ОТДАМ 85 БАЛЛОВ!! ФИЗИКА,7 КЛАСС 4.Лошадь за 40мин прошла 10км. За сколько времени она пройдет 25км с той же скоростью?5. Давление, оказываемое водой на водолаза равно 5кПа. На какой глубине водолаз?ПОЖАЛУЙСТА.​

Answer 1

Question 4: Лошадь за 40 мин прошла 10 км. За сколько времени она пройдет 25 км с той же скоростью?

To find out how long it will take for the horse to travel 25 km at the same speed, we can use the formula:

Speed = Distance / Time

Given that the horse traveled 10 km in 40 minutes, we can calculate its speed:

Speed = 10 km / 40 min

To find the time it will take for the horse to travel 25 km, we can rearrange the formula:

Time = Distance / Speed

Substituting the values, we get:

Time = 25 km / (10 km / 40 min)

Simplifying the expression, we have:

Time = 25 km * (40 min / 10 km)

Calculating this, we find:

Time = 100 min

Therefore, it will take the horse 100 minutes to travel 25 km at the same speed it traveled 10 km in 40 minutes.

Question 5: Давление, оказываемое водой на водолаза, равно 5 кПа. На какой глубине водолаз?

To determine the depth at which the diver is submerged, we can use the formula:

Pressure = Density x Gravity x Depth

Given that the pressure exerted by the water on the diver is 5 kPa, we can rearrange the formula to solve for depth:

Depth = Pressure / (Density x Gravity)

The density of water is approximately 1000 kg/m^3, and the acceleration due to gravity is approximately 9.8 m/s^2.

Substituting the values, we have:

Depth = 5 kPa / (1000 kg/m^3 x 9.8 m/s^2)

Converting kPa to Pa, we get:

Depth = 5000 Pa / (1000 kg/m^3 x 9.8 m/s^2)

Simplifying the expression, we find:

Depth = 0.51 m

Therefore, the diver is submerged at a depth of approximately 0.51 meters.