What is the absolute pressure required by the water pump to reach the 13th floor?

A water pump is located on the first floor of a 13 floor building. The water pump releases water at a pressure of 35lb/in^2. If the distance between each floor is 10ft, what is the absolute... more

Determine the required cross sectional areas

Determine the required cross-sectional areas of members AB and AD of the given truss shown, if the allowable stress in tension is 120MPa while in compression is 105MPa. A reduced allowable stress... more

power electronics

A dc-dc buck converter has the following design parameters: 𝑉𝑖𝑛 = 120 V, 𝑅 = 25 Ω, 𝑃𝑜𝑢𝑡 = 150 W, 𝑓𝑠𝑤 = 200 kHz, and L = 0.4 mH. What should the load value be changed to in order for the converter... more

Determine the minimum diamter required for the shaft of a simple torsion-bar.

A simple torsion-bar spring is shown. The shear stress in the steel [G = 11,500 ksi] shaft is not to exceed 11000 psi, and the vertical deflection of joint D is not to exceed 0.650 in. when a load... more

Propulsion question

A medium sized aircraft with two turbojet engines installed is cruising at an altitude of 10000m at a Mach number of 0.8. At this flight condition, each engine has a net specific work output of 250... more

03/14/22

Calculate ΔH° for the reaction below: 4NO2(g) 4NO(g) + 2O2(g) ΔH° = ?

Consider the following thermochemical equation:2NO(g) + O2(g)  2NO2(g) ΔH° = -113.2 kJCalculate ΔH° for the reaction below:4NO2(g)  4NO(g) + 2O2(g) ΔH° = ?Answer key: +226.4 kJThis was a complete... more

Need help understanding how to solve this type of statistics problem.

Five 100ohm resistors, each having a 5% tolerance, are connected in series. What is theoverall nominal resistance and tolerance or the combination?

11/25/21

In the year 2005, a picture supposedly painted by a famous artist some time after 1635 but before 1685 contains 95.4 percent of its carbon-14 (half-life 5730 years).

From this information, could this picture have been painted by this artist?  Approximately how old is the painting? 

Determine the takeoff speed of the airplane

A 10000 lb airplane is launched from a catapult. The spring of the catapult (ks = 150 lb/in) is initially compressed 10ft. and then released. During the launching, the airplane engine exerts a... more

Thermodynamics- Combustion -Conservation of Energy

I was able to figure problem one, but I need help with problem 2. Thank you for the help!Problem #1: Ethane (C2H6) gas at mass flow rate of 1.5 kg/min is mixed with air (O2 + 3.76N2) at mass flow... more

A airplane is traveling 374mph. How long (in minutes) will it take to travel 6176 miles?

A airplane is traveling 374mph. How long (in minutes) will it take to travel 6176 miles? Round up to the nearest minute. If the answer is 11.2 minutes, then you should type in 12 as the answer.

a full wave rectifier operated from a 60 hz.. find Vpp

A full-wave rectifier is operated from a 60-Hz 50-V-rms source. It has a 500-uF filter capacitor and a 750-omh load.objective:1- find V_avg2- find V peak to peak3- find percent ripple

02/04/21

Ratio and Proportions Review

Solve for the missing variable.

A short, square timber post supports a load of 115 kips. If the allowable unit compressive stress is 1000 psi, what nominal size square timber should be used

A short, square timber post supports a load of 115 kips. If the allowable unit compressive stress is 1000 psi, what nominal size square timber should be used.I don't understand how to get the answer.

Determine the minimum cross-sectional area of a steel bar required to support a tensile force of 50 kips if the allowable unit tensile stress is 20 ksi.

Determine the minimum cross-sectional area of a steel bar required to support a tensile force of 50 kips if the allowable unit tensile stress is 20 ksi.

What axial compression load may be placed on a short timber post whose cross-sectional dimensions are 9.5 × 9.5 in. if the allowable unit compressive stress is 1100 psi?

What axial compression load may be placed on a short timber post whose cross-sectional dimensions are 9.5 × 9.5 in. if the allowable unit compressive stress is 1100 psi?

Clamping Force and Clutch Calculation

A multiple clutch has to transmit 90kW from an engine running at 3500 rpm.Clutch lining outer diameter is 200mm and inside diameter is 160mm. Spring pressure on clutch is 170kPa and it's... more

static and dynamic

Wind turbine blades transmit 137.5 Watt power to shaft with the rotational velocity of 175 rpm. Shaft is supported by journal bearings.a) Determine the smallest diameter of shaft for the factor of... more

The number of chirps per minute, C, that the tree cricket makes is linearly dependent on the temperature, T, in Fahrenheit.

The crickets do not chirp at all below 44 degrees and at 62 degrees they chirp about 63 times per minute. A)  Express the number of chirps, C, as a function of the temperature, T. Be sure to use... more

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