Approximately what percentage of the almost 1,500
highway deaths in Pennsylvania each year are
attributed to aggressive driving?

A. 50%
B. 60%
C.70%
D.80%

Answer: Light energy

Explanation: Light energy is a form of radiant energy that is visible to the human eye.

Answer:

We have to think safe when performing ballroom dances or any other form of dance due to dance moves being a physical activity which is usually prone to some form of accidents.

This is because it involves the movement of various parts of the body which has joints and such joints could easily be sprained when the wrong steps are taken which is usually why caution should be taken.

Owing the swift movements involved in a ballroom dance, we must think safe when performing a ballroom dance.

Dance involves the movement of parts of the body. Usually, these body movements are swift and vigorous. As a result of the vigor involved in moving the body during a dance, it is necessary to exercise caution.

Therefore, it is important to think safe during a ballroom dance to avoid a sprain or fracture or any other kind of injury.

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Answer:

Explanation:

The momentum of an object can be found by using the formula

momentum = mass × velocity

From the question we have

momentum = 730 × 20

We have the final answer as

Hope this helps you

Throughout your life, your skin will change constantly, for better or worse. In fact, your skin will regenerate itself approximately every 27 days. Proper skin care is essential to maintaining the health and vitality of this protective organ.

Answer:

Is always negative answer for you

A.) Steel.

steel travels 5,060 meters per second,

lead travels 1,402 meters per second,

water travels 1,439 meters per second,

and air depends on temperature.

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:

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:

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.

Ur gonna need this...

Brainliest plzzz..thanks..sorry Messy

Answer:

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

Explanation:

Answer:

B

Explanation:

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

Hope this helps!

Explanation:

The calcified bones of our skeleton work with circulatory system. Marrow inside our bones helps to produce cell inside blood. Both red blood cell and white blood cell are produced in bones. Circulatory system delivers oxygenated blood into bones.

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:

Force of kinetic friction, Fk = 6N

Explanation:

Given the following data;

Coefficient of kinetic friction, μ = 0.2

Normal force, Fn=30N

To find the Force of kinetic friction;

Mathematically, the force of kinetic friction is given by the formula;

Fk = μFn

Where;

Substituting into the equation, we have;

Fk = 0.2*30

Fk = 6N

Therefore, the force of kinetic friction is 6N.

A force that is present between two moving objects or surfaces is called kinetic friction. It is estimated in newtons (N) and is calculated by:

[tex]\rm F_{k} =\rm \mu _{\rm k} F_{n}[/tex]

Where, [tex]\rm F_{k}[/tex] = frictional force,  [tex]\mu _{\rm k}[/tex]  = coefficient, [tex]\rm F_{n}[/tex] = normal force.

The kinetic friction of the object is 6N.

The kinetic friction can be estimated as:

Given,

Substituting values in the formula:

[tex]\rm F_{k} =\rm \mu _{\rm k} F_{n}[/tex]

[tex]\begin{aligned}\rm F_{k} &= 0.2 \times 30\\\\\rm F_{k} &= 6 \rm N\end{aligned}[/tex]

Therefore, 6N is the frictional force.

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Answer:

280 N

Explanation:

acceleration = v2-v1 / time taken = (2-4 )/ 0.05 = -40 m/s^2  ( neg sign indicates slowing down )

force exerted = ma = 7 kg x -40 m/s^2 = - 280 N ( neg sign means opposite direction of initial velocity )

since the 7 kg ball is slowing down, the  direction of force will be opposite of the initial velocity , and it will be 280 N

Answer:

Weight of the pile of boxes as I think

Answer:

Explanation:

The work done by an object can be found by using the formula

workdone = force × distance

From the question we have

workdone = 75 × 1.2

We have the final answer as

Hope this helps you

Answer:

[tex]\boxed {\boxed {\sf 90 \ Joules}}[/tex]

Explanation:

Work can be found by multiplying the force by the distance.

[tex]W=f*d[/tex]

The force of the package is 75 newtons.

The distance the package is lifted off the ground is 1.2 meters.

[tex]f= 75 \ N \\d=1.2 \ m[/tex]

Substitute the values in and multiply.

[tex]W= 75 \ N *1.2 \ m[/tex]

[tex]W=90 \ N*m[/tex]

1 Newton meter (N*m) is equal to 1 Joule (J).

Therefore, our answer of 90 Newton meters is equal to 90 Joules.

[tex]W= 90 \ J[/tex]

The work done is 90 Joules.

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:

the amount of force that keeps two surfaces touching, but does not let them come apart or press further together

Explanation:

Hope this helps - Good luck ^w

Normal force is the support force exerted upon an object that is in contact with another stable object.

Answer:

(1) body composition, (2) flexibility, (3) muscular strength, (4) muscular endurance, and (5) cardiorespiratory endurance. 

Explanation:

by finding the distance between two successful crest

Answer:

the wavelength can be measured as the distance from crest to crest  or from trough to trough , the wavelength of a wave can be measured as the distance from a point on a wave to the corresponding point on the next cycle of the wave.

Explanation:

Answer:

A. A 41 kg object that is moving east at 5 m/s

Explanation:

I'm taking this test and got it right.

Answer:

almost 100% positive its B but dont take me up on it

Answer:

1.2 W

Explanation:

Let the value of resistance be R , emf of battery be E

current i = E / R

power = i² R

= E² x R / R²

= E² / R

Given

E² / R = .30

when two batteries are connected

Total emf = 2E

current = 2E / R

Power = ( 2E / R )² x R

= 4 E² / R

= 4 x .30

= 1.2 W .

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

Question is not complete, so i have attached it.

Answer:

A) W = 1.962 N

B) F_f = 0.706 N

C) F_net = 3.294 N

Explanation:

A) The block is 0.2 kg.

Formula for weight is;

W = mg

W = 0.2 × 9.81

W = 1.962 N

B) Magnitude of the force acting on the moving block is given by;

F_f = μmg

Where μ is coefficient of kinetic friction

Coefficient of kinetic friction for copper(mild steel) from online sources is 0.36

Thus;

F_f = 0.36 × 1.962

F_f = 0.706 N

C) Magnitude of net force is;

F_net = F_applied - F_f

F_net = 4 - 0.706

F_net = 3.294 N

1. The weight of the copper block is equal to 1.96 Newton.

2. The magnitude of the force acting on the moving copper block is 0.7056 Newton.

3. The magnitude of the net force acting on the moving copper block is 3.2944 Newton.

Given the following data:

We know that the acceleration due to gravity (g) of an object on planet Earth is equal to 9.8 [tex]m/s^2[/tex].

We know that the coefficient of kinetic friction for copper is equal to 0.36.

1. To determine the weight of the copper block:

[tex]Weight = mg\\\\Weight = 0.200 \times 9.8[/tex]

Weight = 1.96 Newton

2. To determine the magnitude of the force acting on the moving copper block:

Mathematically, the force of kinetic friction is given by the formula;

[tex]F_k = umg[/tex]

Where;

Substituting the parameters into the formula, we have;

[tex]F_k = 0.36 \times 0.200 \times 9.8\\\\F_k = 0.7056 \;Newton[/tex]

3. To determine the magnitude of the net force acting on the moving copper block:

[tex]F_{net} = F - F_k\\\\F_{net} = 4-0.7056\\\\F_{net} = 3.2944\;Newton[/tex]

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Answer: 2 m/s is the answer

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.