An Olympic athlete threw a javelin at the following angles, 30°, 40°, 60°, and 70°. All at the
same speed. Which two angles resulted in the same distance?

Answer:

3.15m³

Explanation:

To solve this problem, let us first find the mass of the petrol from the given dimension.

       Mass  = density x volume

Volume of petrol  = 4.2m³

Density of petrol  = 0.3kgm⁻³  

       Mass of petrol  = 4.2 x 0.3  = 1.26kg

So;

      We can now find the volume of the alcohol

 Volume of alcohol = [tex]\frac{mass}{density}[/tex]  

Mass of alcohol  = 1.26kg

Density of alcohol  = 0.4kgm⁻³  

  Volume of alcohol  = [tex]\frac{1.26}{0.4}[/tex]   = 3.15m³

Answer:

The volume of a regular object can be calculated by multiplying its length by its width by its height. Since each of those is a linear measurement, we say that units of volume are derived from units of length.

Explanation:

Answer:

length×Width×Height

Explanation:

Length×Width×Height is the formula for volume

Answer:

156.8 Joules

Explanation:

Work = Force x Displacement

Displacement = 2m

Force (force of gravity) = mass x acceleration due to gravity =  8Kg x 9.8m/s^2

= 78.4N

Work = FxD

Work = 78.4 N x 2m

Work = 156.8 N·m  OR 156.8 Joules

The amount of work done in lifting this box is equal to 156.8 Joules.

Given the following data:

Scientific data:

To calculate the amount of work that is done in lifting this box:

Mathematically, the work done by a person is calculated by using this formula:

[tex]Work\;done = Fd = mgd[/tex]

Where:

Substituting the given parameters into the formula, we have;

[tex]Work\;done = 8 \times 9.8 \times 2[/tex]

Work done = 156.8 Joules.

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The projectile is any object thrown into space upon which the only acting force is gravity. In other words, the primary force acting on a projectile is gravity. This doesn’t necessarily mean that the other forces do not act on it, just that their effect is minimal compared to gravity. The path followed by a projectile is known as a trajectory. A baseball batted or thrown and the instant the bullet exits the barrel of a gun are all examples of the projectile.

When a particle is thrown obliquely near the earth’s surface, it moves along a curved path under constant acceleration that is directed towards the center of the earth (we assume that the particle remains close to the surface of the earth). The path of such a particle is called a projectile and the motion is called projectile motion. Air resistance to the motion of the body is to be assumed absent in projectile motion.

In a Projectile Motion, there are two simultaneous independent rectilinear motions:

Along the x-axis: uniform velocity, responsible for the horizontal (forward) motion of the particle.

Along y-axis: uniform acceleration, responsible for the vertical (downwards) motion of the particle.

Accelerations in the horizontal projectile motion and vertical projectile motion of a particle: When a particle is projected in the air with some speed, the only force acting on it during its time in the air is the acceleration due to gravity (g). This acceleration acts vertically downward. There is no acceleration in the horizontal direction, which means that the velocity of the particle in the horizontal direction remains constant.

[tex]\sf~~~~~~~~~~~~~~~{\red{\underbrace{\underline{\green{projectile~motion}}}}}[/tex]

Projectile motion is a form of motion in which object or particle is thrown near earth's surface and it moves along a curved path under the action of gravity only.

Answer:

Attraction.

Explanation:

Charging by friction involves rubbing of objects against one another so that one loses electron(s), while the other gains the electron(s). Thus, the objects would have opposite charges after the process.

The glass test tube rubbed with silk loses electron, thus becomes positively charged. While the acrylic rob rubbed with paper towel becomes negatively charged. Since the two rods have opposite charges, then the interaction between them would be attraction. A force of attraction between the rods would be experienced while the rods are brought to a required close range.

Answer:

Sound wave X amplitude is greater than 'A' and its frequency is lesser than

'f'

Explanation:

The pitch of a sound is dictated by the frequency of the sound wave, while the loudness is dictated by the amplitude.

A high pitch sound corresponds to a high frequency and a low pitch sound corresponds to a low frequency.

The larger the amplitude of the waves, the louder the sound and vice-versa.

From the question,

Sound wave W has amplitude ‘A' and frequency 'f' and

Sound wave X is louder and lower in pitch than sound wave W.

Since sound wave X is louder, this means its amplitude is greater than 'A'.

Also, since sound wave X is lower in pitch, this means its frequency is lesser than 'f'.

Answer:

Higher than A, Lower than F

Explanation:

Answer:

The adiabatic process can be derived from the first law of thermodynamics relating to the change in internal energy dU to the work dW done by the system and the heat dQ added to it. The word done dW for the change in volume V by dV is given as PdV. Hence, the equation is true for an adiabatic process in an ideal gas.

Explanation:

Hope it helps......bro

Answer:

ezrfdjhsetnhtjhsksdjghbksfneunaifghejbcifkikjayhr

Explanation:

Answer:

[tex]50\:$\mathrm{m/s^2}[/tex]

Explanation:

From Newton's Second Law, recall [tex]F=ma[/tex].

Rearranging this equation, we have [tex]a=\frac{F}{m}[/tex]. [tex]F[/tex] is given as [tex]25\:\mathrm{N}[/tex] and mass given as [tex]0.5\:\mathrm{kg}[/tex].

Plugging in these values, we get:

[tex]a=\frac{25}{0.5}=\fbox{$50\:\mathrm{m/s^2}$}[/tex].

The rate change of direction or speed of the object is called acceleration. The acceleration of the given mass is 50 m/s².

Acceleration:

It is the rate change of direction or speed of the object. From the Newton's second law of motion,

[tex]\bold {a = \dfrac Fm}[/tex]

Where,

F - force applied = 25 N

m - mass = 0.5 kg

Put the values,

[tex]\bold {a = \dfrac {25}{0.5}}\\\\\bold {a = 50\ m/s^2}[/tex]

Therefore, the acceleration of the given mass is 50 m/s².

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The long time will decrease the velocity which will equally decrease the impulse applied to your knee.

The impulse experienced by an object is the change in momentum of the object.

J = ΔP = m(v - u)

where;

v = distance / time

when time of fall becomes 3 times long, the final velocity becomes 3 times smaller

Since the velocity will be reduced, the impulse applied to your knee will decrease as well.

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Answer:

I don't know the multiple choices or if you have any but my best answer is castle.

I hope this helps!

Answer:

Balanced Forces will not change the object's motion.

Unbalanced Forces will change the object's motion.

Explanation:

Answer:

[tex]1500 \: \mathrm{N}[/tex]

Explanation:

The equation [tex]F=ma[/tex] represents the force needed.

Plugging in [tex]m=250[/tex] and [tex]a=6\: \mathrm{m/s^2}[/tex], we find that the force needed to accelerate a 250 kg object at a rate of [tex]6 \: \mathrm{m/s^2}[/tex] to be [tex]\fbox{$1500 \: \mathrm{N}$}[/tex].

Answer:

vector

direction

Explanation:

Both speed and velocity measures how fast something is moving. Since speed is not a vector, it does not require direction to describe it.

Speed is the distance divided by the time taken. It is a scalar quantity in that it has only magnitude but no direction.

When describing speed, there is no need to specify its direction.

But when describing velocity, we specify both magnitude and direction.

Answer:

Population 1 indicates growth while Population 2 indicates a declining population

Explanation:

Here, using the given rate of change of the population, we want to determine which of the two is growing and which is declining

From the rate of change of both, we can determine this. Looking at the differential equation for the first one, we can see that it is of positive value. Looking at the differential equation for the second one. we can see it is of negative value

While a positive change rate indicates growth, a negative change rate will indicate otherwise

Hence, we can conclude that the one with a negative rate change will indicate a declining population

Answer:

Gravity is an ever present force, and therefore acceleration is guaranteed to happen at every single one of those points (and in fact, everywhere in the universe).

On top of that, friction will be present in all four spots (friction with the rails, with the air, with the axles, etc.), and friction is a perfectly acceptable force that will cause acceleration, slowing the roller coaster down.

So the correct answer is every single point, regardless of what answer the teacher expects.

The object will be moving faster if the acceleration and velocity are pointing in the same direction. The object will also slow down if the acceleration is pointing in the opposite direction as the velocity.

When an object's speed, direction of motion, or both change, it accelerates. Even while it may appear to be virtually immediate in some circumstances, such as when a golf ball is struck by a club or during car collisions, changes in an object's speed are always continuous.

Since gravity is a constant force, acceleration will unavoidably occur at each of those locations and throughout the whole universe.

Therefore, In addition, there will be friction at all four locations—friction with the axles, the air, the rails, etc.—and friction is a completely normal force that will accelerate the roller coaster, slowing it down.

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Answer:

v = 7 m/s

Explanation:

p = m × v

42 = 6 × v

6v = 42

v = 42/6

v = 7 m/s

Answer:

faster than 100 kph

Explanation:

Time taken to complete the first lap is

[tex]\dfrac{15\ \text{km}}{15\ \text{kph}}=1\ \text{hour}[/tex]

If the person's average speed is to be 30 kph then the complete race would be over in [tex]\dfrac{30}{30}=1\ \text{hour}[/tex]

But 1 hour has passed in the first lap already so, the next 15 km must be covered in 0 time.

So, the speed of the bike must be more than 100 kph.

Answer:

Answer:

Explanation:

When a player throws a football , he applies force on the ball , due to which ball accelerates in forward direction . This is the action force .

The ball also applies a force on the hand of the player . Due to it the player experiences a pushing force in backward direction . This is reaction force .

Due to this force , the player does not move in backward direction because of frictional force of the ground . The frictional force keeps him stationary .

Answer:

The linear speed is approximately 354.88361 m/s

Explanation:

The given parameters are;

The time it takes the Earth to make one complete rotation = 24 hrs.

The distance of the location of the person in North America from the axis, r = 4.88 × 10⁶ m

The rotation per 24 hours = 1 rev/(24 h)

24 hours = 24 hours ×60 minutes/hour × 60 seconds/minute = 86,400 seconds

Therefore, we have, the rotation rate per second, n = 1 rev/(86,400 s)

The angular speed, ω = 2·π·(1 rev/(86,400 s)) ≈ 7.2722052 × 10⁻⁵ rad/s

The linear speed, v = ω × r

Therefore, v ≈ 7.2722052 × 10⁻⁵ rad/s × 4.88 × 10⁶ m = 354.88361 m/s.

The linear speed, v ≈ 354.88361 m/s.

Answer:

24000kgm/s

Explanation:

Given parameters:

Mass of car  = 1200kg

Velocity = 20m/s

Unknown:

Momentum  = ?

Solution:

Momentum is the amount of motion a body possesses.

   Momentum  = mass x velocity

 Now insert the parameters and solve;

 Momentum  = 1200 x 20  = 24000kgm/s

Answer:    yeah it is reflection

Answer:

C

Explanation:

Answer:

Gravity is very important to us. We could not live on Earth without it. The sun's gravity keeps Earth in orbit around it, keeping us at a comfortable distance to enjoy the sun's light and warmth. It holds down our atmosphere and the air we need to breathe.

Answer:

Example:

Astronauts reach a distant planet and find it takes eight times as much force to lift objects there than it does on Earth. What is the acceleration due to gravity on this planet?

On this planet the force of gravity is eight times larger. Since the masses of objects are a fundamental property of those objects, they cannot change, that means the value of ​g​ must be eight times larger as well:

[tex]8F_{grav}=m(8g)8F[/tex]

 [tex]=m(8g)[/tex]

The value of ​g​ on Earth is 9.8 m/s2, so 8 × 9.8 m/s2 = 78.4 m/s2.

Answer:

0.64 J/g°C

Explanation:

Using the formula;

Q = m × c × ∆T

Where;

Q = amount of heat

m = mass (g)

c = specific heat capacity

∆T = change in temperature (°C)

In this case:

Q (water) = - Q (metal)

mc∆T (water) = - mc∆T (metal)

According to the information in this question,

For water; m = 100g, c = 4.18J/g°C, ∆T = (25°C - 20°C)

For metal; m = 50g, c =?, ∆T = (25°C - 90°C)

mc∆T (water) = - mc∆T (metal)

100 × 4.18 × (25°C - 20°C) = - {50 × c × (25°C - 90°C)}

100 × 4.18 × 5 = - {50 × c × -65}

2090 = -{-3250c}

2090 = 3250c

c = 2090/3250

c = 0.643

c = 0.64J/g°C

Answer:

0.64

Explanation:

Because I got the question right :)

Answer:

6.19m/s

Explanation:

Given parameters:

Mass of bowling ball  = 35.2kg

Momentum  = 218kgm/s

Unknown:

Velocity of the bowling ball  = ?

Solution:

Momentum is the quantity of motion a body possess;

    Momentum  = mass x velocity

   218  = 35.2 x velocity

     Velocity  = 6.19m/s

Answer:

The complete sentence is presented as follows;

The area of the land is 2.31 × 10¹⁰ square meters in scientific notation

We can represent this area as 2.31 × 10⁴ square kilometers

Explanation:

The question relates to Laws of indices specifically in powers of 10

The given parameters of the dimensions of the rectangular section of forest land are;

5.5 × 10⁵ meters by 4.2 × 10⁴ meters

Therefore, the area, "A" the rectangular section of forest land is A = 5.5 × 10⁵ m × 4.2 × 10⁴ m = 2.31 × 10¹⁰ m²

1 km² = 1 × 10⁶ m²

∴ 2.31 × 10¹⁰ m² = 2.31 × 10¹⁰/(1 × 10⁶) km² = 2.31 × 10¹⁰ ⁻ ⁶ km² = 2.31 × 10⁴ km²

2.31 × 10¹⁰ m² = 2.31 × 10⁴ km²

Therefore, the complete sentence, can be written as follows;

The area of the land is 2.31 × 10¹⁰ square meters in scientific notation

We can represent this area as 2.31 × 10⁴ square kilometers.

Answer:

The area of the land is 2.31 × 10¹⁰ square meters in scientific notation

We can represent this area as 2.31 × 10⁴ square kilometers

The unit square kilometers is more appropriate to represent the area of the forest land in scientific notation

Explanation:

just did it got it correct

Answer:

The justification for this scenario has been characterized elsewhere here.

Explanation:

Answer:

30,000kgm/s

Explanation:

Change in momentum is expressed as;

Change in momentum = mass × change in velocity

∆M = m∆v

Mass m = 1.5×10³kg = 1500kg

∆v = 30-10 =20m/s

Substitute into the formula

Change in momentum = 1500(20)

Change in momentum = 30,000kgm/s