Have you ever wondered how a vending machine "knows" that you have put in the correct amount of change to purchase a snack or a drink? These machines use coin detectors that determine the mass and the size of the coins deposited. In other words, they analyze the density of the coins. United States coinage is minted within very narrow specifications, so the density of each type of coin is always the same. The coin detectors compare the coins inserted to the preset standards to determine if the correct combination of coins has been deposited. In this lesson, you too will determine the density of various coins. OBJECTIVES Recognize the characteristics of density. Design and carry out a scientific investigation. Present your findings in a scientific report. Online Lab This animation will allow you to find the density of a penny, a nickel, and a quarter. Make a hypothesis in which you suggest which coin will have the highest density and which will have the lowest density. A model hypothesis might be: "If the (fill in the name of a coin) has a greater density than the _____ and _____, then it will have a greater mass to volume ratio. If the (fill in the name of a coin) has a lower density than the _____ and _____, then it will have a lower mass to volume ratio. Remember to record your data and observations in the data sheet so that you can use them to present your findings. SHOW TRANSCRIPT Present Your Findings Write a one or two summary paragraph discussing this experiment and the results. Use the following questions and topics to help guide the content of your paragraph. According to your data, was your hypothesis correct? (Be sure to refer to your data when answering this question.) Summarize any difficulties or problems you had in performing the experiment that might have affected the results. Describe how you might change the procedure to avoid these problems. List at least two real world examples that apply the findings of this experiment. (Hint: An example of this type was given in the introduction to this project.) What would you like to do next?

Answer:

The resistivity of an exceedingly good electrical conductor, such as hard-drawn copper, at 20° C (68° F) is 1.77 × 10-8 ohm-metre, or 1.77 × 10-6 ohm-centimetre. At the other extreme, electrical insulators have resistivities in the range 1012 to 1020 ohm-metres.

Answer:

moving water

Explanation:

its called hydropower its a form of renewable energy that uses moving water

Answer:

The differences that will be observed are;

1) The Sun will become faint and will no longer be yellow but rather appear white and will no longer be visible (become invisible) by unassisted vision as we can see the Sun today

2) The size of the Sun will shrink to a size comparable to the size of the Earth

3) The Sun will cool down and will no longer radiate as much heat

4) The nuclear reactions that generate energy on the Sun's will seize and the and the heat from the Sun will be from residual thermal energy

5) The core, which is the hottest part of the Sun will no longer be hydrogen but carbon and oxygen

Explanation:

Answer:

C!

Explanation:

I just did the test !

Please stay safe and wear a mask , we are in the mist of a pandemic ! !

The graph shows the change in velocity of an object in free fall is according to option C.

When an object is released from rest in free air considering no friction, the motion is depend only on the acceleration due to gravity, g.

When an object is made to fall freely, it's velocity is only depended on the acceleration due to gravity, g. The velocity decreases till it become zero.

Thus, the correct option is C.

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Answer:

C

Explanation:

Potential energy is energy that something has when its not moving. Kinetic energy is energy in motion. A ball held over a persons head isn't moving, meanwhile a ball in motion is using kinetic energy.

C)A ball held over a person's head | a ball rolling on the floor.

Objects may have each kinetic electricity and capacity electricity at an equal time. An item may be accelerated above the ground (have capacity electricity) and be shifting at the identical time (and now have kinetic electricity). A baseball, a plane, and a flying chicken are all easy examples of this.

A rushing bullet, a walking person, and electromagnetic radiation like mild all have kinetic energy. Some other example of kinetic strength is the strength associated with the constant, random bouncing of atoms or molecules.

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Answer:

Amplitude

Explanation:

Explanation:

Answer: Explanation:

Locations above the Arctic Circle (north of 66.5 degrees latitude; 90 degrees minus the tilt of Earth's axis) receive 24 hours of sunlight.

Orbits: Sun

Answer:

Explanation:

Given

Acceleration a = 1.0m/s²

Displacement S = 1.0m

Required

Time t taken by the leaf to displace

Using the equation of motion

S = ut+1/2at²

Substitute

1.0 = 0+1/2(1)t²

1 = t²/2

Cross multiply

t² = 2

t = ±√2

t = 1.41secs

It takes the leaf to 1.41s to displace by 1m upward

Answer:

heat occurs to change into solid

Answer:

It's freezing or solidification

Explanation:

The coldness freezes the water making it a solid, like water to an ice cube. Take Disney's Frozen by example. Elsa has a ice touch, so when she touches water, it becomes a solid.

Answer:

there are six types of joints in the human body

Answer: The answer is D. 6

Explanation: Learned in health class a while ago.

Answer:direction

Explanation:

A vector must always have both sizes as well as direction, while on the other hand, any scalar quantity such as the mass of an object would only have magnitude but not direction.

The quantities that contain the magnitude of the quantities along with the direction are known as the vector quantities.

Examples of vector quantities are displacement, velocity acceleration, force, etc.

A scalar number, such as an object's mass, would only have magnitude but not direction, unlike a vector, which must always have both quantities and direction.

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A force of 16 N to the west is applied to each object below , the object with greater mass and velocity have greater momentum. So, A 20 Kg object that is moving east at 10m/s.

Force is an external agent acting on a body, to change it from the state of rest or motion. There are various kinds of forces such as frictional force, magnetic force, nuclear force etc.

In physics, force is the product of mass and acceleration of the body. Greater mass results greater force needed to be applied on the object to make it move or stop.

Momentum is the product of mass and velocity. Thus, as mass or velocity or both increases, momentum of the object increases. Hence the larger object moving faster will gain greater momentum.

Here, option C is the correct answer.

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Answer: A

Explanation:

Answer:

it is a

Explanation:

Answer:

(a). The rocket's velocity is 117.6 m/s.

(b). The rocket can reach at maximum height is 940.8 m.

(c). The velocity the instant before the rocket crashes on the ground is 135.7 m/s.

Explanation:

Given that,

Acceleration = 29.4 m/s²

Time = 4 sec

(a). We need to calculate the rocket's velocity

Using equation of motion

[tex]v=u+at[/tex]

Put the value into the formula

[tex]v=0+29.4\times4[/tex]

[tex]v=117.6\ m/s[/tex]

We need to calculate the maximum height at the moment fuel ends

For the value of x₁

Using equation of motion

[tex]x_{1}=ut+\dfrac{1}{2}at^2[/tex]

Put the value into the formula

[tex]x_{1}=0+\dfrac{1}{2}\times29.4\times4^2[/tex]

[tex]x_{1}=235.2\ m[/tex]

We need to calculate the value of x₂

Using equation of motion

[tex]v^2=u^2-2gx_{2}[/tex]

Put the value into the formula

[tex]0=u^2-2gx_{2}[/tex]

[tex]x_{2}=\dfrac{u^2}{2g}[/tex]

Put the value in to the formula

[tex]x_{2}=\dfrac{117.6^2}{2\times9.8}[/tex]

[tex]x_{2}=705.6\ m[/tex]

(b). We need to calculate the maximum this rocket can reach

Using formula for height

[tex]H=x_{1}+x_{2}[/tex]

Put the value into the formula

[tex]H=235.2+705.6[/tex]

[tex]H=940.8\ m[/tex]

(c). We need to calculate the velocity the instant before the rocket crashes on the ground

Using equation of motion

[tex]v^2=u^2+2gh[/tex]

Put the value into the formula

[tex]v=\sqrt{2\times9.8\times940.8}[/tex]

[tex]v=135.7\ m/s[/tex]

Hence, (a). The rocket's velocity is 117.6 m/s.

(b). The rocket can reach at maximum height is 940.8 m.

(c). The velocity the instant before the rocket crashes on the ground is 135.7 m/s.

Answer:

2cm/year

Explanation:

20000/10000=2cm/year

Answer and Explanation: One ATP release approximately 30.5kJ/mol of energy. Using Avogadro's constant, it is known one mol corresponds to [tex]6.02.10^{23}[/tex] molecules, so 106 ATP molecules releases:

E = [tex]30.5.10^{3}*\frac{106}{6.02.10^{23}}[/tex]

E = [tex]537.04.10^{-20}[/tex]J

A cell is approximately a sphere. Volume of a sphere is given by

V = [tex]\frac{4}{3}.\pi.r^{3}[/tex]

Changing radius from mm to m:

r = [tex]10^{-2}[/tex]m

Then, volume is

V = [tex]\frac{4}{3}.\pi.(10^{-2})^{3}[/tex]

V = [tex]4.2.10^{-6}[/tex] m³

Power density is given by

[tex]power=\frac{energy}{volume}[/tex]

[tex]power=\frac{537.04.10^{-20}}{4.2.10^{-6}}[/tex]

[tex]power=128.10^{-14}[/tex]

power = 12.8.[tex]10^{-15}[/tex] W/m³

Power density for a the cell is 12.8.[tex]10^{-15}[/tex] W/m³.

Power density for battery is

100 cm³ = [tex]10^{-4}[/tex]m³

power = [tex]\frac{15}{10^{-4}}[/tex]

power = [tex]15.10^{4}[/tex]W/m³

Comparing cell and battery, battery has a greater power density.

Answer:

c: will expand and demonstrate the Charles's law

Answer:

1) Jumping Jacks (their a great way to get blood into your muscles and keep your blood running)

2) Toe touches (helps warm up your hamstring so you won‘t get injured easily)

3) Jog in place (Warm up leg muscles and whole body)

4) Arm circles (Warms up arm muscles)

5) 10,10,9,9. (This is something I like, you hop on 1 foot for 10 times and then switch to your other foot ten times without stopping, but after the ten you go back foryour previous hopping leg and hop 9 times this time and same for your other foot, THEN hop 8 times with the foot you started with and, keep going in that order in decending order until you reach 1, (a great way to warm up leg muscle)

Answer:

0.832

Explanation:

8.320 x 10 to the negative 1st power is 0.832

Answer:

I know you may not be reading this but for number 13 the answer is 2 hours because t=d/s which is 4000/2000 which equals to 2.

Explanation:I've currently doing that problem as of the time i'm writing this.

Answer:

friction I would guess? you didnt leave any options.

Explanation:

Hurricanes and tropical storms can also spawn tornadoes and microbursts, create storm surges ... If you are unable to evacuate, go to your wind-safe room.

Answer:

B, C

Explanation:

hi! at point A, D, and F, the object is at a constant speed because the line is horizontal. at point E, the object's speed is increasing because of the line's positive slope. B and C show the object slowing down because the line has a negative slope.

hope this helps!

Answer:

wedges are a type of inclined plane.

Explanation:

i just answered :) :) :)

Wedges are a type of inclined plane is true about the wedges.aThe type of wedges is categorized on the basis of the angles of the inclined plane.

A piece of wood, metal, or other material with one thick end and a thin edge that is used to attach or separate two things or sections of an object."A wedge was used to fasten the door"

The wedge family consists of four designs: pitching wedge, gap wedge, sand wedge, and lob wedge. Each stick has a different loft, which makes it better for various shots.

The Pitching Wedge is the wedge with the lowest loft. It may be utilized for full swings toward the greens as well as lengthy chip shots.

Hence wedges are a type of inclined plane is true about the wedges.

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Answer:I litterly need a picture of this put  the pic and Ill edit this question

Explanation: