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3 years ago

8

How death rate helps in changing population

1 answer:

lapo4ka [179]3 years ago

6 0

Both the birth and death rate are expressed per 1000 of the population.

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What organ is muscular and houses the develop fetus?

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<span>Uterus (structure) ...</span>

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4 years ago

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A sound wave with a frequency of 300 hertz is traveling through a medium at a speed of 320 meters/second. What is its wavelength

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<span>320=300wavelenght=1.06 m

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3 years ago

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Water starts off its existence as a polarized molecule. A stream of water is deflected towards a nearby electrically charged obj

trapecia [35]

Answer:

Option d) can not be determined from the given information

Explanation:

Water is a polar molecule consisting of 2 positive hydrogen atoms and a negative oxygen atom.

When a stream of water is deflected by positively charged object, the water molecules are oriented in such a way that oxygen in water, being negatively charge gets attracted to the charged object and aligns near the object whereas hydrogen aligns on the opposite side overcoming the inter-atomic repulsion.

Similar is the case with hydrogen in case the object is negatively charged.

Therefore, it explains that water is a polar molecule and gets attracted to both positive and negative charges and hence, the sign of the object can not be determined.

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3 years ago

What type of wave is energy transmitted and a definite direction in with a definite speed

SOVA2 [1]

A surface wave is a wave in which particles of the medium undergo a circular motion.

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3 years ago

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A truck is hauling a 300-kg log out of a ditch using a winch attached to the back of the truck. Knowing the winch applies a cons

Pie

Answer:

0.128 s

Explanation:

We have to start by calculating the net force acting on the log. We have two forces:

- The constant pulling force, forward, of F = 2500 N

- The frictional force, backward

The frictional force is given by

$F_f = \mu mg$

where

$\mu=0.45$ is the coefficient of friction

m = 300 kg is the mass of the log

$g=9.8 m/s^2$ is the acceleration of gravity

Substituting,

$F_f = (0.45)(300)(9.8)=1323 N$

So the net force acting on the log is

$F=2500 - 1323=1177 N$

Now, we can find the acceleration of the log by using Newton's second law

$F=ma$

where a is the acceleration. Re-arranging for a,

$a=\frac{F}{m}=\frac{1177}{300}=3.92 m/s^2$

And finally we can find the time it takes for the log to reach a speed of

v = 0.5 m/s

by using the suvat equation:

$v=u+at$

where u = 0 is the initial speed and t the time. Solving for t,

$t=\frac{v}{a}=\frac{0.5}{3.92}=0.128 s$

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4 years ago