What is the net force on a 2-kg skateboard accelerating at a rate of 2 m/s2?

If pressurized air pressure is 350 kPa, atmospheric pressure is 100 kPa, initial atmospheric pressure is 100 kPa, initial accele

Travka [436]

Answer:

$d=8.657mm$

Explanation:

From the question we are told that

Pressurized air pressure is $P_{air}=350 kPa,$

Atmospheric pressure is $P_a=100 kPa$

Initial acceleration of the water rocket is $a_i=0.5g.$

Acceleration of the water rocket is $a_r=0.5g$

Mass of water is $M_w=0.5 kg$

Generally total mass is given mathematically given as

$T_M=0.5+0.5=>1kg$

Generally the tension on the rocket is given mathematically given as

$T=(P_{air}-P_a)A$

$T=(350-100) \frac{\pi d^2}{4}$

T is also

$T=\frac{3Mg}{2}$

Therefore

$T=>(350-100) \frac{\pi d^2}{4}= \frac{3Mg}{2}$

$T=>(350-100) \frac{\pi d^2}{4}= \frac{3*1*9.81}{2}$

$d^2= \frac{3*1*9.81*4}{2(350-100) \pi}$

$d=\sqrt{\frac{3*1*9.81*4}{2(350-100) \pi}}$

$d=8.657mm$

therefore diameter of nozzle is mathematically given as

$d=8.657mm$

8 0

3 years ago

(NO LINKS) Compare and contrast magnetism and electricity. And how are they alike? No need for a long answer.

lakkis [162]

Electricity and magnetism are essentially two aspects of the same thing, because a changing electric field creates a magnetic field, and a changing magnetic field creates an electric field

Explanation:

(Can I please have Brainiest? :)

3 0

3 years ago

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Alan hits a hockey pick of mass 0.3 kg across a hockey rink with a velocity of 18 m/s to the east.

Talja [164]

PART a)

Momentum is defined as product of mass and velocity

so here initial momentum is

$P = mv$

given that

m = 0.3 kg

v = 18 m/s

$P = 0.3(18) = 5.4 kg m/s$

towards East

Part b)

Since puck was initially at rest so here initial momentum must be ZERO

so here to find the force we can use

$F = \frac{\Delta P}{\Delta t}$

so here we have

time interval = 0.25 s

now from above equation

$F = \frac{5.4 - 0}{0.25}$

$F = 21.6 N$

Part c)

Due to friction the puck lose its speed by 5 m/s

final speed = 18 - 5 = 13 m/s

mass = 0.3 kg

final momentum = (0.3)(13) = 3.9 kg m/s

now the impulse due to friction force is given as

$Impulse = P_f - P_i$

$impulse = 3.9 - 5.4 = -1.5 kg m/s$

Part d)

initial momentum of block will be ZERO as it is placed at rest

Initial momentum of the puck is given as

$P = mv = (0.3)(13) = 3.9 kg m/s$

so total momentum before collision is given as

$P = 3.9 + 0 = 3.9 kg m/s$

Part e)

since the system is isolated and there is no external force on it

So here momentum will remain conserved

so here we have

$P_i = P_f$

$3.9 = (m_1 + m_2) v$

$3.9 = (0.3 + 1.2)v$

$v = 2.6 m/s$

so final combined speed will be 2.6 m/s

8 0

3 years ago

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_____ life cycle models of systems development assume that the scope of the project can be articulated clearly and the schedule

Natalka [10]

Answer:

Predictive

Explanation:

There is a wide variety of life cycles applicable to project management. In this regard, we currently have as a reference two somewhat extreme approaches that mark two very different ways of dealing with projects. The predictive approach and the agile approach.

A predictive approach involves a great effort in initial planning and re-planning every time changes are accepted in the project. Therefore, this approach is recommended for changing but not highly changing environments. Although this approach is applicable to any type of project, clear examples of application would be the construction of a subway line, a bridge, the development of critical software. That is, projects where correct and detailed planting is key.

4 0

3 years ago

The four living things seen here, dog, flower, algae, and bacteria, are all made of cells. A - C are multicellular, but D is uni

djverab [1.8K]

B) They are all made up of at least one cell

6 0

3 years ago

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