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3 years ago

Countries with traditional economies are often less developed because:

2 answers:

7 0

People are resistant to change, People have political freedom, Farmers institute new farming techniques and there is little need for medical facilities.

Tpy6a [65]3 years ago

3 0

They can't interact well with a world economy and there is only one way to go and if that way fails the economy does not develop.

You might be interested in

Select the statement that correctly completes the description of phase difference.

KengaRu [80]

Answer:

The difference in the phase angle between any two waves at any given position along the waves.

Explanation:

Phase difference describes the difference in the phase angle between any two waves at any given position along the waves. The equation of wave is given by :

Wave 1, $y=A\ sin(\omega t)$

Wave 2, $y=A\ sin(\omega t+\phi)$

Where

A is the amplitude of wave

$\omega$ is the angular frequency

$\phi$ is the phase difference between two waves

If $\Delta d$ is the path difference, it is given by :

$\Delta d=d\ sin\theta$

Hence, the correct option is (a) "the difference in the phase angle between any two waves at any given position along the waves".

3 0

4 years ago

In February 1955, a paratrooper fell 1200 ft from an

-Dominant- [34]

Answer:

$s=1.1107\ m$ is the minimum depth of snow for survivable stopping.

Explanation:

Given:

terminal velocity of fall, $u=56\ m.s^{-1}$

mass of the paratrooper, $m=85\ kg$

force on the paratrooper by the ice to stop him, $F=1.2\times 10^5\ N$

Firstly, we calculate the deceleration caused in the snow:

$a=\frac{F}{m}$

$a=\frac{120000}{85}$

$a=1411.765\ m.s^{-2}$

Now, using equation of motion:

$v^2=u^2+2a.s$ ....................(1)

where:

v = final velocity of the body after stopping

u = initial velocity of the body just before hitting the snow

a = acceleration of the body in the snow

s = distance through in the snow

Putting respective values in eq. (1)

$0^2=56^2+2\times (-1411.765)\times s$

$s=1.1107\ m$

5 0

3 years ago

A Porsche 944 Turbo has a rated engine power of 217 hp. 30% of the power is lost in the drive train, and 70% reaches the wheels.

shutvik [7]

Answer:

a = 6.53 m/s^2

v = 11.5689 m/s

Explanation:

Given data:

engine power is 217 hp

70 % power reached to wheel

total mass ( car + driver) is 1530 kg

from the data given

2/3 rd of weight is over the wheel

w = 2/3rd mg

maximum force

$F = \mu W$

we know that F = ma

$ma = \mu (2/3 mg)$

$a_{max} = 2/3(1.00) (9.8) = 6.53 m/s^2$

the new power is $p = 70\% P_[max} = 0.7 P_{max}$

$P =f_{max} v$

$0.7P_{max} = ma_{max} v$

solving for speed v

$v =0.7 \times \frac{P_{max}}{ma_{max}}$

$v = 0.7 \frac{217 [\frac{746 w}{1 hp}]}{1500 \times 6.53}$

v = 11.5689 m/s

7 0

3 years ago

THIS IS SOOO IMPORTANT PLS HELP I’LL GIVE BRAINIEST

Ket [755]

Answer:

Chemical etching is a process of printed circuit board (PCB) manufacturing that provides many advantages over mechanical methods.

Explanation:

There's one! UvU hope this helped in whatever you're in for! <3

Good Luck!

6 0

3 years ago

Hi please answer and show your work

jek_recluse [69]

Answer:

$\huge\boxed{\sf P.E. = 240\ MJ}$

$\huge\boxed{\sf K.E. = 19.6\ MJ}$

Explanation:

Given:

Mass = m = 200,000 kg

Vertical Distance = h = 120 m

Speed = v = 14 m/s

Acceleration due to gravity = g = 10 m/s²

Required:

1) Gravitational Potential Energy = P.E = ?

2) Kinetic Energy = K.E. = ?

Formula:

1) P.E. = mgh

2) K.E. = $\displaystyle \frac{1}{2} mv^2$

Solution:

1) P.E. = (200,000)(10)(120)

P.E. = 240,000,000 Joules

P.E. = 240 Mega Joules

P.E. = 240 MJ

2) K.E. = 1/2 (200000)(14)^2

K.E. = (100000)(196)

K.E. = 19,600,000 Joules

K.E. = 19.6 MJ

$\rule[225]{225}{2}$

Hope this helped!

4 0

3 years ago