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3 years ago

15

Who is Robert Goldard

2 answers:

balu736 [363]3 years ago

8 0

Answer:

An am American engineer

maks197457 [2]3 years ago

8 0

Robert Hutchings Robert Hutchings Goddard was Associate in Nursing yank engineer, professor, physicist, and artificer who is attributable with making and building the world' initial liquid-fueled rocket. Goddard with success launched his rocket on March 16, 1926, that ushered in an era of area flight and innovation

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Mile markers appear as green signs.

aksik [14]

Answer:

Mile markers appear as small, rectangular green signs with white numbers. Mile markers are especially useful in determining your precise location on desolate stretches of road. For example, by paying attention to mile markers, you will be able to inform a tow truck driver that you are stalled on the fifty-eighth mile of a particular roadway.

Explanation:

why Mile markers appear as green signs.

4 0

3 years ago

A fluid flows through a 10-mm diameter tube at a Reynolds number of 1800. If the flow rate is 6.0 liters/min, what is the head l

Eddi Din [679]

Answer:

29.31 m

Explanation:

It is given that flow rate Q =6.0 ltrs/minute $=\frac{6}{1000\times 60}$ $m^3/sec$

Diameter =10 mm

So radius = $\frac{10}{2}=5 mm=5\times 10^{-3}m$

Area of duct $A=\pi r^2=3.14\times(5\times 10^{-3})^2=7.854 \times 10^{-5}m^2$

Average velocity $v=\frac{Q}{A}=\frac{10^{-4}}{7.854\times 10^{-5}}=1.372 m/sec$

The given Reynolds number is 1800 which is less than 2000 so it will be a laminar flow

So Reynolds number friction factor $f=\frac{64}{1800}=0.0356$

So head loss ifs given by $\frac{fLv_{avg}^2}{d\times 2\times g}=\frac{0.0356\times 100\times 1.732^2}{10\times 10^{-3}\times 2\times 9.81}=29.39\ m$

5 0

3 years ago

A cannon ball is fired with an arching trajectory such that at the highest point of the trajectory the cannon ball is traveling

ELEN [110]

Answer:

The radius of curvature is 979 meter

Explanation:

We have given velocity of the canon ball v = 98 m/sec

Acceleration due to gravity $g=9.81m/sec^2$

We know that at highest point of trajectory angular acceleration is equal to acceleration due to gravity

Acceleration due to gravity is given by $a_c=\frac{v^2}{r}$ , here v is velocity and r is radius of curvature

So $\frac{98^2}{r}=9.81$

r = 979 meter

So the radius of curvature is 979 meter

8 0

4 years ago

Air at 300 K and 100 kPa steadily flows into a hair dryer having electrical work input of 1500 W. Because of the size of the air

dezoksy [38]

Answer:

0.0280Kg/s

Explanation:

Given:

W = 1500

V2 = 300

V1 = 0

Q = 0 ( adiabatic)

T1 = 300

T2 = 20 m/s = converting to degrees we have 353°c

Let's use the energy equation

$Q - W = m_• *( Cp(dT) + 0.5*(V2^2 - V1^2) Q = 0$

[/tex] m_• = W / (Cp(dT) + 0.5*V2^2) [/tex]

$= 1500 / (1005(353 - 300) + 0.5*21^2)$

$= 1500 W / 53485.5 =0.0280 kg/s$

8 0

4 years ago

Read 2 more answers

Discuss four (4) advantages of direct and indirect water supply system.

Reil [10]

Answer and Explanation:

Some of the advantages of direct water supply system are:

Smaller size of the cistern
No risk of polluted water
Ease of installation
Lower pipe work

Some of the advantages of indirect water supply system are:

It can be pumped completely
Lower demand on the main source
Minimization of wear and tear on taps
Larger size of the cistern.

7 0

3 years ago

Read 2 more answers