Other Engineering Answers

A vehicle for landing on the moon has a mass of 4500kg. The damped spring-undercarriage system of the vehicle has a stiffness of 450kn/m and a damping ratio of 0.2. The rocket lift engines are cut off when the vehicle is hovering at an altitude of 10m. Calculate the maximum deflection of the undercarriage system when the vehicle hits the surface. On the moon, the gravitational acceleration is 1.6m/s2

Determine the force, F in lbf, required to lift a five gallon bucket full of water from rest with an
acceleration of 3 m/s . Ignore the mass of the bucket.

Sir, I Need Project on "Automatic Single Image 3D Reconstruction on Manhattan Indoor World Scenes" in MATLAB

A stadium has internal dimensions of 11 m x 4 m x 3 m high. The doors in this construction occupy 6m2 and 20% of the wall area is glazed. The inside air temperature is maintained at 18°C when the outside air temperature is -2°C. There are 4 air changes per hour. Total heat gain for the building is 2200W. The U-values in W/m.K are: walls 1.6, windows 5.5, doors 2.5, roof 1.5 and floor 0.8. The volumetric specific heat capacity of the air is 1300 J/m3K. The output of the radiators is 440 W/m2 of radiating surface.

Note:

a) Calculate the net rate of heat loss from this building.
b) Calculate the surface area of the radiators required to maintain the internal temperature under the above conditions.

2500 kg pickup accelerates from 0 to 100 km/hr in 10 s along level road. What would be corresponding time when pulling 500 kg trailer? Assume constant acceleration and neglect all retarding forces.

Hampson and Walker also made measurements of the heats of sublimation of
rhodium and iridium. Do the following calculations for each of the two given sets of
data:
a Make a histogram.
b Make a stem-and-leaf plot.
с Make a boxplot.
d Plot the observations in the order of the experiment.
e Does that statistical model of independent and identically distributed
measurement errors seem reasonable?
f Find the mean, 10% and 20% trimmed means, and median and compare them.
g Find the standard error of the sample mean and a corresponding approximate
90% confidence interval.
h Find a confidence interval based on the median that has as close to 90% coverage
as possible.
i Use the bootstrap to approximate the sampling distributions of the 10% and 20%
trimmed means and their standard errors and compare.
j Use the bootstrap to approximate the sampling distribution of the median and its
standard error. Compare to the corresponding results for trimmed means above.
к Find approximate 90% confidence intervals based on the trimmed means and
compare to the intervals for the mean and median found previously.
Iridium
136.6 145.2 151.5 162.7 159.1 159.8 160.8 173.9 160.1
160.4 161.1 160.6 160.2 159.5 160.3 159.2 159.3 159.6
160.0 160.2 160.1 160.0 159.7 159.5 159.5 159.6 159.5
Rhodium
126,4
133.3
131.3
134.2
132.6
135.7
132.5
131.2
133.8
133.3
132.9
133.0
132.1
133.3
133.5
131.5
133.0
131.1
133.5
133.5
131.1
132.4
131.4
133.4
132.3
131.1
131.6
131.2
133.5
132.7
131.9
132.6
131.1
133.0
132.9
132.7
132.2
131.1
132.8
134.1

Hi ,can you help with my btec level 3 advanced certificate in mechanical engineering. From the UK
Many thanks
Steve.

C-S2: Standard battery for the Blackberry Curve 8520
Type: Li-ion
Volts: 3.7 V
Weight: 23 g
Capacity:1150 mAh
Dimensions: 55 x 34 x 5.5 mm

Queston calculate:

1. the battery capacity in Wh
2. the volumetric energy density in Wh/cm3
3. the gravimetric energy density in Wh/kg.

Explain how feedback and sensors are used to regulate variables (temperature, pressure, position, etc.) in Engineering.

Task
1) Robots are used in Manufacturing and many other Industrial contexts.
i) What are the advantages of using Robots (50 words max.) (15 marks)
ii) Explain how feedback and sensors are used to regulate variables
(temperature, pressure, position, etc.) in Engineering. (10 marks)

2) A laser delivers pulses of 2mJ at wavelength 633 nm with a pulse duration of
200 ps. (hint E=h.c/l, with h=6.6 x10-34 J.s and c=3x108 m/s and 1 eV=1.6
x10-19 J)
i) How far do they travel in 1s? (5 marks)
ii) What is the photon energy in eV? (10 marks)
iii) How many photons are delivered per pulse? (10 marks)

3) A 2 kW kettle, 90% energy efficient is used to boil 1 liter of water from 20ºC to
100ºC. (heat capacity of water is 4180 J/kg.K, latent heat of water is 2256
kJ/kg)
i) How long does this take? (20 marks)
ii) How long more to completely boil-off the water (5 marks)
4) Boyle’s law describes the relationship between pressure and volume in a gas at constant temperature.
i) Can you guess what is the effect of temperature on volume for a constant
pressure (~50 words) (10 marks)
ii) Can you guess what is the effect of temperature on pressure for a constant
volume (~50 words) (10 marks)
iii) Can you give two practical examples of the processes mentioned in ii) and iii)
(max 50 words, Hint: in the kitchen and in a car) (5 marks)