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3 years ago

11

There are very, very few times that scientists make estimations because they don’t have enough time or data to test all the poss

ible answers to the question they have. TRUE OR FALSE

1 answer:

Zanzabum3 years ago

6 0

True, it’s limited to when they use estimations at most

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18. A person pulls horizontally with a force of 64 N on a 14-kg box. There is a force of friction between the box and the floor

MA_775_DIABLO [31]

since force=massxacceleration
therefore acceleration=force/mass
the resultant force=the acting force on the object-the frictional force
the resultant force=64-36=28N
therefore the acceleration=28/14=2m/sec^2

4 0

3 years ago

What is the similarities between reforestation and afforestation

Alla [95]

Answer:

Afforestation is the planting or adding of trees in an area where there was never a forest or plantation. This is a method to create a new forest. Reforestation is the replanting of trees in an area where there was once a forest which was destroyed or damaged.

Explanation:

3 0

3 years ago

A cryogenic vacuum pump works by condensing vapors onto some absorbent medium. This is an efficient and clean way to pump a syst

Julli [10]

Answer: Temperature in Fahrenheit is 577.4

Explanation:

The conversion factor for converting celcius to Fahrenheit is:

$F=\frac{9}{5}\times C+32$

where F = temperature in Fahrenheit

C = Temperature in Celcius

Given : Temperature difference in Celcius = $303^0C$

Putting in the values we get:

$F=\frac{9}{5}\times 303+32$

$F=577.4$

Thus the answer in Fahrenheit is 577.4

6 0

2 years ago

Physics in motion Unit 6A The nature of waves

Daniel [21]

#1

length of one complete wave shape is known as wavelength

#2

Frequency is defined as number of oscillations per second or number of waves passing through a point in one second.

#3

One Time period is the time to cover one complete wavelength distance by the wave

#4

relation between time period and frequency is given as

$f = \frac{1}{T}$

#5

Time period of simple pendulum is given as

$T = 2\pi \sqrt{\frac{L}{g}}$

so it depends on length of pendulum and acceleration due to gravity

#6

amplitude of the wave is the height above the axis to which particle can attain its maximum position or its maximum height on y axis is amplitude

4 0

3 years ago

Gina is driving her car to work, but she’s stopped at a red light. When the light turns green, she presses the gas pedal and acc

Vlad [161]

Since car is initially at rest so at that position the net force on car in vertical as well as horizontal both direction is zero

but after lights are green the car will speed up in horizontal direction

so now we can say that

It will accelerate in horizontal direction

So now as per Newton's formula we have

$F = ma$

so now the force in horizontal direction will become nonzero while in vertical direction car is still in equilibrium

So now we can say

$F_x = ma$

$F_y = 0$

so the correct answer will be

C. The net force on the car is greater than zero in the horizontal direction.

4 0

3 years ago