# ارجو مساعدتي بحل هذة المسائل

#### alikamalrh

##### عضو جديد
1-
An escalator in a shopping center is designed to move 30 people , 75kg each, at a constant speed of 0.8m/s at 45 slope. Determine the minimum power input needed to drive this escalator. What
would your answer be if the escalator velocity were to be doubled
?

2-
An adiabatic closed system is raised 100m at a loca-tion where the gravitational acceleration is 9.8m/s^2 . Deter- mine the energy change of this system, in kJ/kg
.

3-
A river flowing steadily at a rate of 240m^3/s is con-sidered for hydroelectric power generation.It is determined that a dam can be built to collect water and release it from an elevation difference of 50m to generate power . Determine how much power can be generated from this river water after the dam is filled
.

4-
The water behind Hoover Dam in Nevada is 206m higher the Colorado River below it.At what rate must wa-ter pass though the hydraulic turbines of this dam to produce 100mw of power if the turbines are 100 percent efficien
?

5-
Determine the energy required accelerate an 800-kg car from rest to 80km/h on a level road
.​

التعديل الأخير: