what is the definition of normal force

Answer:

I believe gravity is acting on it

Answer:

B

Explanation:

You need a specific force to change the momentum of something.

Hope this helps!

Answer: C. Light energy.

Explanation:

Answer:

sound travels faster in the night

Explanation:

Answer:

medium

Examples:

A medium is a thing that the sound wave would travel through, like sound waves traveling through air. A mechanical wave cannot travel without a medium, like if the wave were trying to travel through a vacuum.

Answer:

It would take the cyclist 2 hours to cycle to school.

Explanation:

5km/hr for 2 hours would be 10km.

Answer:

Explanation:

100c+13600kg÷m2

The density of mercury is 13600 kg / m³ at 0 °C. Its density at a temperature of 100 °C is 0.735 × 10⁻⁴  kg / m³.

The mass of a material substance per unit volume is its density. The formula for density is [tex]d = M/V[/tex] Where d represents density, M is mass, and V is volume. Density is commonly measured in grams per cubic centimeter.

As an example, the density of Earth is 5.51 grams per cubic centimeter, but the density of water is 1 gram per cubic centimeter.

Given:

The density of mercury, d = 13600 kg / m³,

The temperature difference. ΔT = 100 - 0 = 100 °C,

Calculate the change in volume if the mass is 13.6 kg and the coefficient of cubical expansion is 1.82×10⁻⁴ °C⁻¹ by the formula given below,

ΔV = V α ΔT

ΔV = (13.6 ÷ 13600) × 1.82 × 10⁻⁴

ΔV = 0.00182 × 10⁻⁴ m³

New volume V₁​ = V + ΔV = 13.6 ÷ 13600 + 0.00182 × 10⁻⁴

New density d₁ = V₁ / 13.6  =  10.00182 × 10⁻⁴ / 13.6 = 0.735 × 10⁻⁴  kg / m³

Therefore, the density of mercury is 13600 kg / m³ at 0 °C. Its density at a temperature of 100 °C is 0.735 × 10⁻⁴  kg / m³.

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Answer:

Hope this helps.

Explanation:

Let's start b writing down coordinates of all points:

A(0,0,0)

B(0,5,0)

C(3,5,0)

D(3,0,0)

E(3,0,4)

F(0,0,4)

G(0,5,4)

H(3,5,4)

a.) When we reflect over xz plane x and z coordinates stay same, y coordinate  changes to same numerical value but opposite sign. Moving front-back is moving over x-axis, moving left-right is moving over y-axis, moving up-down is moving over z-axis.

A(0,0,0)

Reflecting

A(0,0,0)

B(0,5,0)

Reflecting

B(0,-5,0)

C(3,5,0)

Reflecting

C(3,-5,0)

D(3,0,0)

Reflecting

D(3,0,0)

b.)

A(0,0,0)

Moving

A(-2,-3,1)

B(0,-5,0)

Moving

B(-2,-8,1)

C(3,-5,0)

Moving

C(1,-8,1)

D(3,0,0)

Moving

D(1,-3,1)

Answer: B. The speed will decrease.

Explanation:

When you ride a roller coaster, the wheels rub/scrape the rails, creating heat as a result of friction. And friction will slow you down. So increasing the friction on a roller coaster would slow it down.

Answer:

B

Explanation:

Friction opposes motion therefore reducing motion

Answer:

distance and time

Explanation: the farther you go and how much time it will take you

Answer:

42.05 m/s

Explanation:

From the question given above, the following data were obtained:

Initial velocity (u) = 0 m/s

Height (h) = 239 m

Acceleration due to gravity (g) = 3.7 m/s²

Final velocity (v) =?

The velocity with which the camera hits the ground can be obtained as follow:

v² = u² + 2gh

v² = 0² + 2 × 3.7 × 239

v² = 0 + 1768.6

v² = 1768.6

Take the square root of both side

v = √(1768.6)

v = 42.05 m/s

Therefore, the velocity with which the camera hits the ground is 42.05 m/s

Answer:

5m/s is the answer s=d/t 25/5=5m/s

Answer:

5m/s

Explanation:

The formula for speed is s=distance/time. The distance traveled was 25 meters. The time it took to travel that distance was 5 seconds. Therefore, s= 25m/5s to give an answer of 5 m/s

Answer:

This system uses angular momentum and torque to do work on objects, typically against the force of gravity. The wheel and axle simple machine is closely related to gears.

Answer:

Explanation:

Step one:

given data

initial velocity u= 40m/s

time taken t=3seconds

final velocity v=?

Step two:

applying the first equation of motion

v=u-gt---  (the -ve sign implies that the arrow is against gravity)

assume g=9.81m/s^2

v=40-9.81*3

v=40-29.43

v=10.57m/s

Step three:

how high the target is located

applying

s=ut-1/2gt^2

s=40*3-1/2(9.81)*3^2

s=120-88.29/2

s=120-44.145

s=75.86m

Answer:

a blaring trumpet is sound energy

Explanation:

Answer:

It is a constant when the light is traveling in a vacuum.

Answer:

Protons and electrons are charged particles. Neutrons have no charge.

Answer:

The freshwater biome will be most likely to be affected by the weather conditions as the freshwater reservoirs accumulates water from sources like rain, flood and melting of snow. The reservoirs form are groundwater, river, lakes, ponds and others. In the absence of rain the water will not be accumulated in the biome and will effect the life forms living there.

Explanation:

Answer:

balance is tha answer hope it us helpful

Explanation:

for most everyday objects scientist use a balance to obtain an object mass .A Balance compares an object with a known mass to object the question

Answer:

it is a the answer is a btw

Explanation:

Answer:

Explanation:

Well, lets say you park your car on the top of a hill, gravitational energy prevents it from the car falling back. Or a snow pack, aka before a potential avalanche. Though gravity cannot keep it safe forever, gravitational energy keeps it from crashing asap. In this case, it gives you time to escape. Altogether, gravitational force keeps the earth in it's atmosphere.

Answer: a piece of iron near a magnet

Explanation:

Answer:

The ones that are after the light that went out are also out.

Explanation:

Answer:

they all go out

Explanation:

they are wired together so they all go out. i am an electrician.

Answer:

10N each

Explanation:

Doing a little math here to make it balanced. 10+10=20 therefore you have the same on both sides.

Hope this helps!

Answer:

Long short

Explanation:

1

Dogs that are bigger are selected to be parents.

2

The parents are bred together, and their offspring will be different sizes.

3

The biggest offspring will be selected and bred together.

4

This cycle continues until the dogs have been selectively bred to be bigger than the current world record size.

5

Selective breeders need to ensure that they are not also selecting for disadvantageous traits, like genetic limb defects.

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Brainliest plzzz..thanks..sorry Messy

Answer:

Geological and atmospheric changes happening over a long time scale can cause short extinctions.

Explanation:

Answer: D. 332n

Explanation: I took the quiz and that was the correct answer

An actual velocity is measured directly from an object's displacement-time graph while a theoretical velocity is calculated by using a mathematical equation or scientific theory.

Velocity refers to the rate of change in displacement (distance) of an object with respect to time.

Also, velocity is a vector quantity and this simply means that, it has both magnitude (speed) and direction.

Mathematically, velocity is given by the formula;

[tex]Velocity =\frac{displacement}{time}[/tex]

In an experiment, there are two (2) main types of velocity used and these include:

In conclusion, an actual velocity is measured directly from an object's displacement-time graph while a theoretical velocity is calculated by using a mathematical equation or scientific theory.

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Answer:

(a) Cyclist A travels faster.

(b) The time taken by cyclists A and B is 10 minutes and 8.58 minutes respectively.

Explanation:

Given that the speed of cyclist A= 24 km/h

As 1 km = 1000 m and 1 hour= 3600 seconds.

So, [tex]24 \frac {km}{h}=24\times \frac{1000 m}{3600 s}=\frac{20}{3}\frac {m}{s}=6.67 m/s[/tex]

and the speed of cyclist B = 6.8 m/s.

The length of the road = 4 km=4000 m.

(a) Speed of cyclist A is 6.67 m/s which is more than the 6.8 m/s.

Hence, cyclist A travels faster.

(b) If d be the distance to be traveled and V be the speed, than the time, t, required is,

[tex]t=\frac{d}{V}\cdots(i)[/tex]

For cyclist A:

As A is located at the beginning of the road, he has to cover full length of the road.

So, the distance to be covered by cyclist A =4 km.

Hence, from equation (i), the time taken by cyclist A is

[tex]t=\frac{4}{24}=\frac{1}{6}[/tex] hour

[tex]=\frac{1}{6}\times {60}=10[/tex] minutes. [ as 1 hour = 60 minumes]

So, time taken by cyclist A is 10 minutes.

For cyclist B:

As B is located 500 meters later from the beginning of the road, he has to cover the remaining length of the road.

So, the distance to be covered by cyclist B =4000 m-500 m= 3500 m.

Hence, from equation (i), the time taken by cyclist B is

[tex]t=\frac{3500}{6.8}=514.71[/tex] seconds

As 60 seconds= 1 minute.

So, t= 514.71/60 minutes = 8.58 minutes.

[tex]=\frac{1}{6}\times {60}=10[/tex] minutes. [ as 1 hour = 60 minumes]

So, the time taken by cyclist B is 8.58 minutes.

Initial speed of the coin (u)= 0 (As the coin is released from rest)

Acceleration due to gravity (a) = g = 9.81 m/s²

Time of fall (t) = 1.5 s

From equation of motion we have:

[tex] \boxed{ \bf{v = u + at}}[/tex]

By substituting values in the equation, we get:

[tex] \longrightarrow [/tex] v = 0 + 9.81 × 1.5

[tex] \longrightarrow [/tex] v = 14.715 m/s

[tex] \therefore [/tex] Speed of the coin as it hits the ground/Final speed of the coin = 14.715 m/s

The speed of the coin as it hits the ground is 14.715 m/s.

We can solve the problem above using the equation of acceleration under gravity.

⇒ Equation:

v = u+gt................... Equation 1

⇒ Where:

From the question,

⇒ Given:

Substitute these values into equation 1

Note the speed has a negative sign because it acts in the same direction as the acceleration due to gravity

Hence, the speed of the coin as it hits the ground is 14.715 m/s.

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Answer:

PE = mgh

Explanation:

m is mass, g is gravitational constant (9.81) and h is height