In a complete description of a force vector, which is usually not necessary?
O A. magnitude
O B. direction
OC. type
O D. units

Answer: B. Chemical Properties

Explanation:

Answer:

a) Vf = 13.87[m/s]

b) t = 1 [s]

Explanation:

a)

To solve this problem we can use kinematics equations:

[tex]v_{f}^{2}= v_{i}^{2}+(2*g*h)[/tex]

where:

Vf = final velocity [m/s]

Vi = initial velocity = 4 [m/s]

h = elevation = 9 [m]

g = gravity acceleration = 9.81 [m/s^2]

[tex]v_{f}=\sqrt{(4)^{2} +(2*9.81*9)}\\v_{f}=13.87[m/s][/tex]

b)

Now using the next equation we can find the time

[tex]v_{f}=v_{i} +(g*t) \\t = (13.87-4)/9.81\\t=1[s][/tex]

Answer:

1 lb. is 453.592 grams

Explanation:

1lb is 453.592 grams

Answer:

Reversible change from one state to another

Hope this helps

:)

A hypothesis and/or theory is s a proposed solution to a scientific problem.

A hypothesis is an assumption based on some basic, limited evidence for further investigation. A proposed solution to a scientific problem is called a hypothesis.

The scientific hypothesis is defined as the relationship between two or more variables or a proposed explanation for some observed process. The scientific hypothesis can happen during scientific experiment.

The good scientific hypothesis may possess a hypothesis must be testable and falsifiable. Someone must be able to test a given hypothesis through scientific experimentation.

A hypothesis is an assumption based on some basic, limited evidence for further investigation. A proposed solution to a scientific problem is called a hypothesis.

Thus, A proposed solution to a scientific problem is called a hypothesis.

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Answer:

D. No, the cannonball will fall short of the goal

Explanation:

Based on the information given in the problem,  No, the cannonball will fall short of the goal, therefore the correct answer is option D.

There are three equations of motion given by Newton,

v = u + at

S = ut + 1/2×a×t²

v² - u² = 2×a×s

As given in the problem a  cannonball is launched off a 100 m cliff horizontally with an initial velocity of 50 m/s. The goal is to have the cannonball travel a target distance of 400 meters,

By using the second equation of motion in the vertical direction,

100 = ut + 0.5*9.81*t²

t = 4.51 seconds

The distance traveled by the cannonball in the horizontal direction at the same time = 4.51*50

                 =205 meters

Thus, based on the information given in the problem,  No, the cannonball will fall short of the goal, therefore the correct answer is option D.

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Explanation:

Force is push or pull on a body.

Contact force is a force that requires contact. It acts between two body that touches on another.

Examples are pushing a car, ringing a bell, kicking a ball.

Non contact forces are forces applied to another object without contact. The action of this force is usually through a targeted force field.

Examples are magnetic force, gravitational force

Answer:

When a negative charge is brought near one end of a conductor electrons are repelled. ... When electric voltage is applied, an electric field within the metal triggers the movement of the electrons, making them shift from one end to another end of the conductor. Electrons will move toward the positive side.

1/Rt = 1/R1 + 1/R2 + 1/R3+ 1/R4+ 1/R5

1/Rt = 1/6+ 1/6+1/6+1/6+1/6

1/Rt = 5/6

Rt = 6/5

Rt = 1.2 ohm

so B is the answer

Answer: D. the Schachter-Singer theory

Explanation:

The Schachter-Singer theory which is also called the Two-factor theory of emotion, explains that humans feel emotion after they appraise the changes in their body in reaction to a stimuli as this would then give them a better means to tell which emotion they are feeling.

Lynette in the first instance noticed she had a racing heart and rapid breathing in response to watching two other players and was then able to appraise this and attribute it to excitement.

When the same thing occurs again but under different circumstances, she is able to appraise it differently and attribute it to nervousness which shows that the Schachter-Singer theory is the relevant theory.

am sorry i thout this was my question not your answer sorry

temperature of the water must be controlled

the answer would be microwaves!

Answer:

Microwaves

Explanation:

Explanation:

Answer:

14,42

Explanation:

Let the smaller number be x

Hence, the larger number = 3x

Hence,

[tex]3x-x=28\\2x=28\\x=14[/tex]

Hence, the smaller number = x = 14

The larger number = 3x = 42

Answer:

14715 joules

Explanation:

Answer:

What class is this for, I think I have done this before.

Answer:

The average speed form A to C is 72 miles/hour

Explanation:

Average Speed

If an object travels a distance d in a time t regardless of the direction, the average speed is the quotient of the distance over the time:

[tex]\displaystyle \bar v=\frac{d}{t}[/tex]

Lily travels from A to C in two steps:

First, she takes ta=3 hours from A to B at va=60 miles/hour. The distance traveled in that time is:

da=va*ta

da=3*60 = 180

da = 180 miles

Then she takes tb=2 hours to travel from B to C at a speed 50% increased with respect to va, thus:

vb=150*va/100=1.5*60=90

vb=90 miles/hour

She travels a distance:

db=2*90=180 miles

The total distance traveled is

dt=180 + 180 = 360 miles

And the total time taken is

tt= 3 + 2 = 5 hours

Thus, the average speed is:

[tex]\displaystyle \bar v=\frac{dt}{tt}[/tex]

[tex]\displaystyle \bar v=\frac{360}{5}[/tex]

[tex]\displaystyle \bar v=72\ miles/hour[/tex]

The average speed form A to C is 72 miles/hour

Answer:

5.2kg

Explanation:

mass is measured in kilograms

therefore its si unit is kg

Answer:

[tex]q_1=\pm0.03 \mu C[/tex] and [tex]q_2=\pm0.02 \mu C.[/tex]

Explanation:

According to Coulomb's law, the magnitude of  force between two point object having change [tex]q_1[/tex] and [tex]q_2[/tex] and by a dicstanced is

[tex]F_c=\frac{1}{4\pi\spsilon_0}\frac{q_1q_2}{d^2}-\;\cdots(i)[/tex]

Where, [tex]\epsilon_0[/tex] is the permitivity of free space and

[tex]\frac{1}{4\pi\spsilon_0}=9\times10^9[/tex] in SI unit.

Before  dcollision:

Charges on both the sphere are [tex]q_1[/tex] and [tex]q_2[/tex], d=20cm=0.2m, and [tex]F_c=1.35\times10^{-4}[/tex] N

So, from equation (i)

[tex]1.35\times10^{-4}=9\times10^9\frac{q_1q_2}{(0.2)^2}[/tex]

[tex]\Rightarrow q_1q_2=6\times10^{-16}\;\cdots(ii)[/tex]

After dcollision: Each ephere have same charge, as at the time of collision there was contach and due to this charge get redistributed which made the charge density equal for both the sphere t. So, both have equal amount of charhe as both are identical.

Charges on both the sphere are mean of total charge, i.e

[tex]\frac{q_1+q_2}{2}[/tex]

d=20cm=0.2m, and [tex]F_c=1.406\times10^{-4}[/tex] N

So, from equation (i)

[tex]1.406\times10^{-4}=9\times10^9\frac{\left(\frac{q_1+q_2}{2}\right)^2}{(0.2)^2}[/tex]

[tex]\Rightarrow (q_1+q_2)^2=2.50\times10^{-15}[/tex]

[tex]\Rightarrow q_1+q_2=\pm5\times 10^{-8}[/tex]

As given that the force is repulsive, so both the sphere have the same nature of charge, either positive or negative, so, here take the magnitude of the charge.

[tex]\Rightarrow q_1+q_2=5\times 10^{-8}\;\cdots(iii)[/tex]

[tex]\Rightarrow q_1=5\times 10^{-8}-q_2[/tex]

The equation (ii) become:

[tex](5\times 10^{-8}-q_2)q_2=6\times10^{-16}[/tex]

[tex]\Rightarrow -(q_2)^2+5\times 10^{-8}q_2-6\times10^{-16}=0[/tex]

[tex]\Rightarrow q_2=3\times10^{-8}, 2\times10^{-8}[/tex]

From equation (iii)

[tex]q_1=2\times10^{-8}, 3\times10^{-8}[/tex]

So, the magnitude of initial charges on both the sphere are [tex]3\times10^{-8}[/tex] Coulombs[tex]=0.03 \mu C[/tex] and [tex]2\times10^{-8}[/tex] Colombs or [tex]0.02 \mu C[/tex].

Considerion the nature of charges too,

[tex]q_1=\pm0.03 \mu C[/tex] and [tex]q_2=\pm0.02 \mu C.[/tex]

Protection in a volcanic ashfall:

Stay inside, if possible, with windows and doors closed.

Wear long-sleeved shirts and long pants.

Use goggles to protect your eyes.

Keep your car or truck engine switched off.

Protection from earthquake if you're indoors:

Drop down and take cover under a desk or table

Stay inside until the shaking stops and it is safe to exit.

Stay away from bookcases and other furniture that can fall on you.

Stay away from windows and light fixtures.

If you are in bed – hold on and stay there.

Answer:

best way is to remain inside ur home or under any table

Answer:

I think is B. sound, nuclear, electrical

but if I wrong then I am so sorry

Answer:

0.36 kgm/s

Explanation:

Formula for momentum is :

P=mv

p is momentum

m is mass = 30g = 0.03kg

v is velocity = 12 m/s

P= 0.03 x 12

P = 0.36 kgm/s

Answer:

12s

Explanation:

Answer:

Would it be starting point?

Explanation:

When you start a sport or something, you may not be good or bad at it. However, as time goes on you are going to improve.

Idk if this helps or not buh yeah

Answer:

The stovetop system is open because heat can be lost into the air. A closed system is one that cannot transfer energy to its surroundings.

Answer: From spectral lines astronomers can determine not only the element, but the temperature and density of that element in the star.

Explanation: The spectral line also can tell us about any magnetic field of the star. The light from the stuff between the stars allows astronomers to study the interstellar medium.

Hope this helps! :)

When a bowling ball strikes a bowling pin, they impart equal forces upon the other.

The correct option is (a) Equal forces

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Definition: Wavelength can be defined as the distance between two successive crests or troughs of a wave.