How many atoms are represented by the formula CaF2? A. Four B. Five C. Two D. Three

Answer:

i need this too

Explanation:

Answer:

I'm pretty sure it's Electric Field Lines

Answer:

23N

Explanation:

Answer:

9.3N

Explanation:

Fgrav = m • g = 14.7 N (g is 9.8 m/s/s)

a = v2 / R = (4 • Fgrav)/1 = 16 m/s/s

Fnet = m • a = 1.5 kg •16 m/s/s = 24 N, down

Fnet = Fgrav + Ftens, so

Ftens = Fnet - Fgrav

Ftens = 24 N - 14.7 N = 9.3 N

Answer:

i have no clue

Explanation:

Answer:

10.2 km

Explanation:

Displacement is the shortest distance from your original position after movement.

Now, the Zambeef delivery truck moves 18 km north and then 10 km east and then 16 km south.

This means that vertically the truck is 2km short of the 18 km he travelled north..

So we can find the displacement using pythagoras theorem..

Let d be the distance from the current position to the initial position.

Thus;

d² = 2² + 10²

d² = 4 + 100

d = √104

d ≈ 10.2 km

I have attached a diagram showing the direction of this displacement

Answer:

yes

Explanation:

of course indeed correct

Answer:

D. Zero

Explanation:

A machine can only do work if it is operational

Answer:The skater has the lowest amount of kinetic energy at the top of the track and lowest potential energy at the lowest point of the track. Kinetic energy is the speed a object is going, and potential energy is the energy a object has when its not moving. While the skater moves up the ramp the potential energy increases, and the kinetic energy decreases because it slows down while moving up the ramp. Hope this helps have a nice day ❤️

Explanation:

First recognize that the total energy of the skater is conserved: this means that the total energy of the skater is constant. The total energy (E) consists of the kinetic energy (KE) and gravitational potential energy (Ug).

E=KE+Ug

Now we know that the gravitational potential energy depends on the distance from the zero of potential (or in simpler terms: how high the skater is from the ground). Now, we are ready to answer the question.

The skater possesses the most KE at point B: remember total energy is a constant and at point B the skater has the least amount of potential energy (since they are at their lowest point above the ground). This means that the skater must have more kinetic energy at point B.

Similarly, at points A and C, the skater possesses the most potential energy since they are at their highest point above the ground.

As the skateboarder moves then it will have the maximum kinetic energy at the lower most portion of the track and will have the zero potential energy at the same point and at the maximum height of the track the skater will have maximum potential energy and zero kinetic energy.

As the skater moves on the track his kinetic and potential energy converts into each other but the total energy remains constant.

Total Energy = KE+PE

At maximum height the kinetic energy will totally convert into the potential energy and becomes zero.and the potential energy becomes maximum at this point.

At Max height (Total energy=Max Potential energy)         KE=0

Similarly at the lower most portion of the track the Potential energy completely convert into the kinetic energy and becomes zero. And kinetic energy becomes max at this point.

At lower point  (Total energy= Max Kinetic Energy)         PE=0

Thus the skater will have the most kinetic energy at the lower most point of the track and least potential energy at the same point.

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Answer:

133225

Explanation:

Answer:

Mass of bus = 6,818.18 kg (Approx.)

Explanation:

Given:

Velocity = 22 m/s

Momentum = 150,000 kg-m/s

Find:

Mass of bus

Computation:

Mass =  Momentum / Velocity

Mass of bus = 150,000 / 22

Mass of bus = 6,818.18 kg (Approx.)

Answer:

D

Explanation:

heat is an energy that transfers from a hot body to cold body

D. Heat

Heat is the transfer of kinetic energy from one medium or object to another, or from an energy source to a medium or object.

Such energy transfer can occur in three ways: radiation, conduction, and convection.

As heat is a form of energy, and therefore the SI unit of heat is also joules (J) which are defined as the amount of energy needed to raise the temperature of a given mass by one degree.

Heat is the transfer of energy from a warmer object to a cooler object.

For example, a lighted match (higher temperature object) will transfer heat to a large pan filled with lukewarm water (lower temperature object).

Therefore,

The term describes the transfer of energy from a hot object to a cooler one is Heat.

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Answer:

False

Explanation:

The mass of an object is normally known as the weight of the object. but mass is the amount of matter in the object. Weight is the force exerted on an object by gravity

Answer: False

Explanation: mass is the amount of matter in an object

Answer:

Magnetic induction cannot be done in a wood because it is not a magnetic person like iron , nickel,and cobalt

Answer:

54.55 m/s

Explanation:

From the question above,

Change in velocity = impulse/mass

Δv = I/m = Ft/m................... Equation 1

Where F = force, t = time, m = mass

Given: F = 20 N, t = 30 s, m = 11 kg

Substitute these values into equation 1

Δv = (20×30)/11

Δv = 600/11

Δv = 54.55 m/s

Hence the change in velocity of the body is 54.55 m/s

The change in velocity of the body is 54.54 m/s

The velocity of the body of an object is the change of the distance of the object with time.

From the information given:

the mass of the b0dy = 11 kg

the net force F = 20 N

the time (t) = 20 s

Similarly;

Force = ma

20 = 11 ×  (a)

[tex]\mathbf{a = \dfrac{20}{11} \ m/s^2}[/tex]

a = 1.818 m/s²

However, the acceleration of an object is the change in velocity with time.

[tex]\mathbf{a = \dfrac{\Delta V}{t}}[/tex]

ΔV =  (a) ×  (t)

ΔV = 1.818 m/s² × 30 s

ΔV = 54.54 m/s

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If the charge on the object is doubled then the new electrostatic force is 72 units.

Non-contact forces, such as electrostatic forces, pull or push on objects without actually making contact with them. When certain materials are rubbed together, a phenomenon known as "charge" can be transferred from one surface to another. Uncharged items are pulled by charged objects, which in turn may push or pull against other charged ones.

Let q and Q represent the charges on objects 1 and 2, respectively.

Charge Q is separated from charge q by a distance r, and their electrostatic attraction is given by:

F = kqQ/r²

where k is Coulomb's constant

According to the question:

F = 36 units

⇒  kqQ/r² = 36 units

Now, the charge on object 2 is doubled, so it now acquires a 2Q charge.

So the new electrostatic force will be:

F' = kq(2Q)/r²

F' = 2kqQ/r²

F' = 2F = 2×36

F' = 72 units

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Answer:

96w

Explanation:

p=Iv..where v=12 and I=8.0

Answer:

A: 0.83 Hz

Explanation:

Frequency can be calculated in a multitude of ways. The one way that is going to help you solve this problem is (# of times/seconds)

so you would divide 85 swings/102 seconds

= 5/6 or 0.8333 Hz

so your answer is A

Answer:

140.8/2.54=55.43 inches

Answer:

0.25m/s^2

Explanation:

F = ma

a = F/m

(Newton's Second Law)

Answer:

i dont know im so sorry for making you feel like you

Explanation:

i dont know im so sorry for making you feel like you

Complete question is;

Describe how α-radiation is similar to β-radiation?

Answer:

Explained below

Explanation:

The similarity between both alpha radiation and beta radiation is that in both cases, they both show deflection when they go through electric and magnetic fields. Although alpha deflects towards the negative plate while bets deflects towards the positive plate.

Secondly they both have high speeds. Just that alpha is from the helium nucleus while beta is from electrons.

Answer: C. gamma waves.

Explanation:

:)

Answer:

Newton's first law of motion states that an object's motion will not change unless an unbalanced force acts on the object. ... The football player in the photo above is in motion. He will stay in motion unless players on the other team exert an unbalanced force against him.

Explanation:

https://flexbooks.ck12.org/cbook/ck-12-middle-school-physical-science-flexbook-2.0/section/1.4/related/rwa/football-physics/

LINK

Answer:

The two defining characteristics of a stem cell are perpetual self-renewal and the ability to differentiate into a specialized adult cell type.

Answer:

Stem cells have the ability to differentiate into specific cell types. The two defining characteristics of a stem cell are perpetual self-renewal and the ability to differentiate into a specialized adult cell type.

Answer: Most objects expand when they take in heat for example get a metal sphere and put it next to a blow torch it would expand just enough to not fit in the ring anymore, but when it cools down it will go back to its original size releasing the energy

Explanation:

Answer:

a.Distance = 150 m

b. Displacement = 50 m

Time lapsed = 5 seconds

Explanation:

a. Distance is the change in the position of an object.

The distance covered by the car = 100 + 50

                                                   = 150 m

b. Since displacement is a vector quantity,

Displacement of the car = 100 - 50

                                        = 50 m due east

c. Time elapsed is the time taken for the motion of the car starting from when its starts to when it stops.

Thus, the time elapsed = 4 + 1

                        = 5 seconds

Answer:

reversing the current

Explanation: