A vector points -1.55 units
along the x-axis, and 3.22 units
along the y-axis.
Find the direction of the vector.

Answer:

friction

...............

Answer:

Friction

Explanation:

Friction, air resistance, and tension are other examples of contact forces. Straight from the book. Please give branliest

Explanation:

divide the distance by the time it takes to travel that same distance, then add your direction to it.

Or change in displacement divided by change in time.

Answer:

I think the answer is D-they require onky one electron to fill their outer energy level.

Answer: A because yoir tires will grip the ground other than the wet road you will slide and go of in the ditch or go into the tree ...hope this helps

Explanation:

Answer:

Wegner's hypothesis met with wide skepticism, but found support and development in ... theory because Wegener could not satisfactorily explain how the continents moved.

Explanation:

Some of his theory was proven wrong, but he was still correct about his hypothesis. The fossils were part of proof for the theory because some of the fossils were found on shore line. And, some of those animals couldn't swim. So, this is proof that some animals lived on the land. And over time the land drifted apart.

Answer:

A rectangle has two dimensions:we can measure its length and,perpendicular to that,its width.

Explanation:

Answer:43.6°

Explanation:

Refractive index=n=1.45

Critical angle=c

n=1/sinc

1.45=1/sinc

Cross multiply

1.45sinc=1

Divide both sides by 1.45

(1.45sinc)/1.45=1/1.45

sinc=0.6897

c=sin(inverse)(0.6897)

c=43.6°

Critical angle is 43.6°

Answer:

The current would be multiplied by 1/4, meaning it is reduced by 3/4 of itself.

Explanation:

This is because when the resistance increases, the current decreases along with it.

Answer:

If your mass on Earth is 71 Kg, what is your weight on Earth to two decimal places?

your mother you uncultured swain how dumb can you be go jump off a bridge ETAY who even names there child ETAY more like EBAY

Answer:

you will pass but if your grade become lower and u get more absences you will fail

Answer:

Reproductive cloning involves creating an animal that is genetically identical to a donor animal through somatic cell nuclear transfer. In reproductive cloning, the newly created embryo is placed back into the uterine environment where it can implant and develop. Dolly the sheep is perhaps the most well known example. In therapeutic cloning, an embryo is created in a similar way, but the resulting "cloned" cells remain in a dish in the lab; they are not implanted into a female's uterus.

Answer:

Reproductive cloning involves creating an animal that is genetically identical to a donor animal through somatic cell nuclear transfer. In reproductive cloning, the newly created embryo is placed back into the uterine environment where it can implant and develop. Dolly the sheep is perhaps the most well known example. In therapeutic cloning, an embryo is created in a similar way, but the resulting "cloned" cells remain in a dish in the lab; they are not implanted into a female's uterus.

Answer: Limiting reactant

Explanation:

The limiting reactant is a reactant will get completely consumed up in the reaction. This reactant being in low concentration will lead to the formation of limited amount of product.

In the given situation, since the butter cakes are required to be 3 sticks for making 3 cakes but only 2 cakes are available thus the butter stick is the limiting reactant.

Answer:

Explanation:

A Solid is one of the three main states of matter. By definition a solid is something whose molecules are so densely packed together that it allows it to keep its shape. Therefore if the item has a definite shape that does not change on it's own it is a solid. As opposed to a liquid which will take and fill the shape of it's container.

Answer:

C. Exothermic Reaction

Explanation:

Let's go through the choices

A. Combustion - Combustion is a highly exothermic / redox reaction which produces light and heat (i.e basically it bursts into flames). In the description, the only reaction is that it feels warm, hence this is not the answer.

B. Endothermic - Recall that endothermic reactions absorbs heat and thus cools the surroundings thereby making test tube feel cooler. this is obviously not the case so this is not the answer.

C. Exothermic - Recall that exothermic reactions releases heat and thus causes the surroundings thereby making the test tube feel warmer (or hotter in some cases). This describes our situation so THIS IS THE ANSWER.

D. Endergonic reactions require an input of energy from an external source that is adsorbed by the reaction (for example if heat was applied by an external source). In this case, there is no mention of additional energy sources. Hence this is probably not the answer.

Answer:

(of the moon) have a progressively smaller part of its visible surface illuminated, so that it appears to decrease in size.

Explanation:

Answer: ultrasonic cleaners

Explanation:

To solve this we must be knowing each and every concept related to  sound wave. Therefore, in ultrasonic cleaners, sound waves are absorbed.

A sound is a type of energy or a vibration that moves through a material such as air or water. Sound may pass through such a gaseous medium as well. It is anything that is audible. The velocity of sound varies depending on the medium.

A wave is a medium that transmits energy from one location to another. Waves are classified into three types: transverse waves, longitudinal waves, or surface waves.

Transverse waves transport the material back and forth in a right angle towards the energy movement. Longitudinal waves transmit energy through compressing then expanding the medium, allowing the energy to travel ahead. In ultrasonic cleaners, sound waves are absorbed.

Therefore, in ultrasonic cleaners, sound waves are absorbed.

To know more about sound wave, here:

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Answer:

The total number of people in the US is the population while the 3000 people selected for the study is the sample.

Explanation:

In the study according to the illustration, the population of study is the total number of people in the US while the sample is the number of people selected out of the population for the study which is 3000.

In a research, a population refers to the total number of individuals present in an area at a specific time where researchers wish to conduct their study.

A sample, on the other hand, refers to a portion of a population of interest during a research, that is selected via a suitable sampling procedure to represent the entire population.

It is most often virtually impossible, time, and resource consuming to study the entire population during a research, especially for a large population. Hence, sampling represents a faster and more economic way of studying populations although this leaves room for different margins of errors.

Answer:

8.36e2

Explanation:

Use a scientific calculator

Its notation is written as :

8.36 x 10^2

Answer:

F = 592238.09 N

Explanation:

To find the mean force you first calculate the acceleration by using the following kinematic equation:

[tex]v^2=v_o^2+2ax\\\\v_o=0m/s\\\\v=10km/h\\\\x=8.4m\\\\[/tex]

you do "a" the subject of the equation and replace the values of the other parameters:

[tex]a=\frac{v^2}{2x}=\frac{10000m/s}{2(8.4m)}=595.23\frac{m}{s^2}[/tex]

next, the force, by using the second Newton law is:

[tex]F=ma=(1000kg)(595.23\frac{m}{s^2})=595238.09\ N[/tex]

hence, the force is 592238.09 N

- - - - - - - - - - - - - - - - - - - - - - - - - - -

TRANSLATION:

Para encontrar a força média, primeiro calcule a aceleração usando a seguinte equação cinemática:

você faz "a" o assunto da equação e substitui os valores dos outros parâmetros:

Em seguida, a força, usando a segunda lei de Newton, é:

portanto, a força é 592238.09 N

Answer:

0.25 Hz

4 s

Explanation:

Speed = wavelength × frequency

7 m/s = 28 m × f

f = 0.25 Hz

Frequency = 1 / period

0.25 Hz = 1 / T

T = 4 s

Answer:

11.44J/C

Explanation:

To find the electric potential for a point at 3m from one extreme of the bar you use the formula for the electric potential:

[tex]V=\int k\frac{dq}{r}=\int k\frac{dq}{x+3}[/tex]

Where r = x+3 represent the 3m distance of the charge to a point x in the bar.

dq: differential of charge = λdx. λ is the linear charge density.

k: Coulomb constant = 8.98*10^9 Nm^2/C^2

You can write dq as λdx. Furthermore, If you assume that the other extreme of the bar is at origin of the x-axis you can write the integral as follow:

[tex]V=\int_{0}^{2}k\frac{\lambda dx}{x+3}\\\\V=k\lambda \ ln(x+3)|_{0}^{2}=k\lambda (0.510)[/tex]

You replace λ ad k in the last expression:

[tex]V=(8.98*10^9Nm^2/C^2)(\frac{5*10^{-9}C}{2m})(0.510)=11.44\frac{J}{C}[/tex]

hence, the electric potential is 11.44J/C

Answer:

Power generate by elephant = 666.67 W

Explanation:

Given:

Force = 2,000 N

Change in time = 45 Seconds

Distance = 15 meter

Find:

Power generate by elephant ?

Computation:

⇒ Work Done = Force × Distance

⇒ Work Done = 2,000 × 15

⇒ Work Done = 30,000

⇒ Power = Work Done / Time taken

⇒ Power generate by elephant = 30,000 / 45 seconds

⇒ Power generate by elephant = 666.67 W

Answer:

x = 265.5 m

Explanation:

To find the distance traveled by the car you first use the following formula:

[tex]v=v_o+at[/tex]   (1)

vo: initial velocity = 65.0m/s

a: acceleration = 15.0m/s^2

t: time = 3.00 s

you replace the values of vo, t and a in the equation (1) in order to calculate the final velocity v:

[tex]v=65.0m/s+15.0m/s^2(3.00s)[/tex] = 110 m/s

Next, you use the following formula:

[tex]v^2=v_o^2+2ax[/tex]

x: distance traveled

You do x the subject of the formula and replace the values of vo, v and a:

[tex]x=\frac{v^2-v_o^2}{2a}\\\\x=\frac{(110m/s)^2-(65.0m/s)^2}{2(15.0m/s^2)}=262.5\ m[/tex]

hence, the distance traveled by the car is 265.5 m

Answer:

d

Explanation:

Answer:

The total amount of dissolved salts in water is called, salinity.

Explanation:

Answer:

D. Electricity will flow if the electrons are bound loosely to their atoms in the material.

Explanation:

The continuous flow of charges is known as electricity (current). The flow of these charges are due to free or mobile electron within the atoms of the conductors. The materials which will allow current to pass through them, must have free or mobile electrons which are loosely bound to their atoms.

Thus, the correction for this question is "D"

D. Electricity will flow if the electrons are bound loosely to their atoms in the material.

Answer:

There is 2 beats per second.

Explanation:

You have to subtract them to find your answer and 178 - 176= 2

Answer:

1.505*10^{24}  molecules

Explanation:

The number of molecules is independent of the subtance, and only depends on the number of moles.

To calculate the number of molecules in a substance with n moles you use the following formula:

[tex]m=nN_A[/tex]

m: number of molecules

NA: Avogadro's number = 6.02*10^23 molecules/mol

n: moles of the substance = 2.5 mol

You replace the values of n and NA in the equation for m and you obtain:

[tex]m=(2.5mol)(6.02*10^{23}molecules/mol)\\\\m=1.505*10^{24}\ molecules[/tex]

hence, the number of molecules is 1.505*10^24

Answer:

Explanation:

Samantha walks along a horizontal path in the direction shown the curved path is a semi circle with a radius of 2 m while the horizontal part is for me what is the magnitude of displacement

Displacement is given by the straight line distance between P and Q. Displacement will be length of straight line joining P and Q

a semi circle with a radius of 2 m

Length of this straight line=4+diameter

=4+(2*2)

=8 m

Answer:

Cardiovascular disease, cognitive impairment, tinnitus and hearing loss

Answer:

The two health disorders caused by noise pollution are:

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