solve these please I really need help​

Answer:

0.15kg/m³

Explanation:

Density = mass/ volume

Given that

Mass = 150kg

Note that volume = length x breadth x height

Volume = 20 x 10 x 5

Volume = 1000m³

Density = mass ➗ volume

Density = 150kg ➗ 1000m³

Density = 0.15kg/m³

I hope this was helpful, Please mark as brainliest  

Final answer:

The density of the substance is calculated by dividing its mass by its volume. With a mass of 150kg and volume of 1000m³, the density is 0.15 kg/m³.

Explanation:

To find the density of a substance, you need to divide its mass by its volume. The given mass of the substance is 150kg, and the dimensions provided are 20m by 10m by 5m. First, you have to calculate the volume by multiplying these dimensions together:

Volume = length × width × height = 20m × 10m × 5m = 1000m³.

Now, you can calculate the density using the formula:

Density = mass / volume = 150kg / 1000m³.

Therefore, the density of the substance is 0.15 kg/m³.

Answer:it is c

Explanation:

the question answered itself.

reread the question

The subject of this question is Physics. Average speed is used to measure the speed of an object because it takes into account the variation over time.

The subject of this question is Physics. The question is discussing the concept of speed and how it is measured. It explains that average speed is used because the speed of an object may vary over time. Distances and time are important measurements for calculating speed, but average speed takes into account the variation over time. Therefore, the correct answer is option C: average speed is used, which is total distance divided by total time.

https://brainly.com/question/32123193

#SPJ2

Final answer:

Using the heat conduction formula, we determined that 432000 joules of heat flows through the slab in one day, given the thermal conductivity, area, temperature difference, time, and thickness of the material.

Explanation:

To calculate the amount of heat flow through the slab, we use the heat conduction formula: Q = (k*A*ΔT*t)/d, where:

k is the thermal conductivity,

A is the cross-sectional area,

ΔT is the temperature difference,

t is the time, and

d is the thickness of the material.

Giving us the following values to use in the formula: k = 0.1 J/s.m.ºC, A = 100 cm2 (or 0.01 m2 when converted to square meters), ΔT = 100 ºC, t = 1 day (or 86400 seconds), and d = 2 cm (or 0.02 m).

Q = (0.1 J/s.m.ºC * 0.01 m2 * 100 ºC * 86400 s)/0.02 m,
Q = (0.1 * 0.01 * 100 * 86400)/0.02,
Q = 432000 J.

Therefore, 432000 joules of heat flows through the slab in one day.

Answer: electrical energy

Explanation:

Electrical energy

Answer:

5.74

Three significant figures

Explanation:

Distance =35.896m

Time =6.25

Speed = distance / time

= 35.896/6.25

=5.74

Final answer:

The resulting calculation should have 3 significant figures.

Explanation:

The resulting calculation should have 3 significant figures.

When determining the number of significant figures in a calculation, the general rule is to use the fewest number of significant figures present in any of the given values.

In this case, the given distance (35.896 meters) has 3 significant figures and the given time (6.25 seconds) has 3 significant figures. Therefore, the average speed calculation should be rounded to 3 significant figures as well.

Answer:

kinetic energy = 1 ÷ 2 × mass ×velocity ^2

kinetic energy = 1 ÷ 2 × 0.15 × 100^2

Kinetic energy = 750 Joules

Explanation:

NOTE ; S.I unit of mass is kilograms

car 1 & car 2

Explanation:

Momentum is the product of mass and velocity.

Form a table as shown below

Car              Mass            velocity          Momentum

1                     5                   2.2                 5*2.2 = 11

2                    5.5                2.0                 5.5*2=11

3                     6                   1.35                6*1.35=8.1

4                     6.5                1.90               6.5*1.90=12.35

5                      7                   1.35                7.0*1.35=9.45

Learn More

Momentum:https://brainly.com/question/3088457

Keywords : lab,measurements, velocities, toy cars, masses, column, rows,magnitude

#LearnwithBrainly

The magnitude of momentum is the product of an object's mass and its velocity. When you calculate these for each car, Cars 1 and 2 are found to have the same momentum of 11 kg m/s.

The momentum of an object is calculated by multiplying its mass by its velocity. In this case, you can calculate the momentum for each car and then compare the results to find which have the same magnitude of momentum.

From this, we can see that Car 1 and Car 2 have the same magnitude of momentum (11 kg m/s).

Learn more about Momentum here:

https://brainly.com/question/33450468

#SPJ3

1.358 J is the kinetic energy of the car driven by Mrs. Waid.

Explanation:

Given data:

Velocity at which Mrs. Waid drives her car = 80 mph

In order to convert mph (meter per hour) into mps (meter per second),

         [tex]\frac{80}{3600}=0.0222 \mathrm{m} / \mathrm{s}[/tex]

Car weighs 2500 lbs, means mass of the car, m = 2500 lbs

I kilo gram = 2.20462 pound

Therefore, 1 pound (lb)=  0.45359237 kilograms (kg).

To converting pounds into kilogram,

               [tex]\frac{2500}{0.45359237}=5511.55 \mathrm{kg}[/tex]

As we know, the kinetic energy can be defined as directly proportionate to the object’s mass (m) and square of its velocity (v). The expression can be given as below,

               [tex]\text { kinetic energy }(K . E)=\frac{1}{2} \times m \times v^{2}[/tex]

By substituting the given values, we get

              [tex]\text { kinetic energy }(K . E)=\frac{1}{2} \times 5511.55 \times 0.0222^{2}[/tex]

              [tex]\text { kinetic energy }(K . E)=\frac{1}{2} \times 5511.55 \times 0.00049[/tex]

              [tex]kinetic energy (K . E)=1.358 joule[/tex]

Answer:

I'm not 100% sure of the answer but I think it is A. It doubles

Explanation:

Hope this helps!

Answer:

Linear and rotational Kinetic Energy + Gravitational potential energy

Explanation:

The ball rolls off a tall roof and starts falling.

Let us first consider the potential energy or more specifically gravitational potential energy ([tex]mgh[/tex]; [tex]m[/tex] = mass of the ball, [tex]g[/tex] = acceleration due to gravity, [tex]h[/tex] = height of the roof). This energy comes because someone or something had to do work to take the ball to the top of the roof against the force of gravity. The potential energy is naturally maximum at the top and minimum when the ball finally reaches the ground.

Now, the ball starts to roll and falls off the roof. It shall continue rotating because of inertia (Newton's first law). This contributes to the rotational kinetic energy ([tex]\frac{1}{2}I\omega^2[/tex]; [tex]I[/tex]=moment of inertia of the ball & [tex]\omega[/tex] = angular velocity).

Finally comes the linear kinetic energy or simply, kinetic energy ([tex]\frac{1}{2}mv^2[/tex]) which is caused due to the velocity [tex]v[/tex] of the ball.

Option B

The particles will move up and down over small areas is the motion of the particles in this kind of wave

The given image demonstrates the traverse waves. In a transverse wave, the particle displacement is upright to the path of wave generation. The particles do not go along with the wave; they solely swing up and down about their particular stability stands as the wave crosses by.

Representatives of transverse waves involve oscillations on a string and ripples on the covering of water. In a transverse wave, the particles are uprooted straight to the track the wave journeys.

Answer:

ITS B
PLEASE GIVE THE OTHER KID BRAINLIEST HE OR SHE DESEREVES IT

Explanation:

Answer:

C

Explanation:

Wetlands: These are areas or placed where water covers the soil or the area or is present either at or near the surface of the soil all year or for varying periods of time during the year,it may also include the growing season.

They are two types of metamorphic rocks which differ on the basis of formation and appearance.

Explanation:

6a) Acceleration of the bullet: [tex]1.44\cdot 10^5 m/s^2[/tex]

6b) Final velocity of the bullet: 360 m/s

7a) Acceleration of the truck: [tex]1.50 m/s^2[/tex]

7b) Net force on the truck: 54,000 N

7c) The acceleration will triple

Explanation:

6a)

The acceleration of the bullet can be found by using Newton's second law, which states that the net force acting on an object is equal to the product between the mass of the object and its acceleration:

[tex]F=ma[/tex]

where

F is the force

m is the mass

a is the acceleration

For the bullet in this problem, we have

F = 3600 N (force)

m = 0.025 kg (mass of the bullet)

Therefore, the acceleration is

[tex]a=\frac{F}{m}=\frac{3600}{0.025}=1.44\cdot 10^5 m/s^2[/tex]

6b)

The motion of the bullet is a uniformly accelerated motion, so we can use the following  suvat equation:

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

where

u is the initial velocity

v is the final velocity

a is the acceleration

t is the time elapsed

In this problem, we have:

u = 0 (the bullet starts from rest)

t = 0.0025 s (time)

[tex]a=1.44\cdot 10^5 m/s^2[/tex] (acceleration)

So we can solve to find v, the final velocity of the bullet as it leaves the rifle:

[tex]v=0+(1.44\cdot 10^5)(0.0025)=360 m/s[/tex]

7a)

The acceleration of a body is defined as the rate of change of its velocity:

[tex]a=\frac{v-u}{t}[/tex]

where

u is the initial velocity

v is the final velocity

t is the time taken for the velocity to change from u to v

a is the acceleration

For the truck in this problem, we have

u = 0 (it starts from rest)

v = 28 m/s (final velocity)

t = 18.7 s (time elapsed)

Substituting, we find the acceleration

[tex]a=\frac{28-0}{18.7}=1.50 m/s^2[/tex]

7b)

The net force on the truck can be calculated using Newton's second law:

[tex]F=ma[/tex]

where

F is the force

m is the mass

a is the acceleration

For the truck in this problem,

m = 36,000 kg is the mass of the truck

[tex]a=1.50 m/s^2[/tex] is the acceleration

So, the net force on the truck is

[tex]F=(36,000)(1.50)=54,000 N[/tex]

7c)

We said that the relationship between the net force on the truck and its acceleration is

[tex]F=ma[/tex]

The equation can be rewritten as

[tex]a=\frac{F}{m}[/tex]

We notice that the acceleration is directly proportional to the acceleration.

Here we are told that the net force on the truck is tripled, therefore

[tex]F'=3F[/tex]

As a consequence, the new acceleration of the truck would be

[tex]a'=\frac{F'}{m}=\frac{3F}{m}=3\frac{F}{m}=3a[/tex]

So, the acceleration also triples.

Learn more about force, acceleration and Newton's second law:

brainly.com/question/11411375

brainly.com/question/1971321

brainly.com/question/2286502

brainly.com/question/2562700

#LearnwithBrainly

Answer:

The crumpled paper hits the ground first due to air resistance. The crumpled paper has less surface area than the flat paper, therefore the crumpled paper hits first.

I hope this helped. If you could mark brainliest that would be greatly appreciated.

Answer:

Crumpled paper

Explanation:

because it has less surface area than flat paper and resistance force is not acting on it

Answer:

A.) the car

Explanation:

hope this helped <3

As a truck rounds a curve, a box in the bed of the truck slides to the side farthest from the center of the curve. This movement of the box is a result of inertia.

Explanation:

We can answer this question by using Newton's first law of motion, also known as law of inertia, which says that:

"When an object is moving with constant velocity (or it is at rest), it will keep moving with same constant velocity (or it will remain at rest) unless acted upon an unbalanced force"

We can apply this law to the box in the bed of the truck. At first, the truck is moving in a straight line, with constant velocity: and so, the box is having the same motion.

However at some point, the truck begins the curve. If we neglect the friction between the box and the bed of the truck, then there is no other  force acting on the box in the horizontal direction: this means that the box will keep its horizontal motion, so it will continue moving forward with constant velocity, and therefore we will see the box sliding to the side farthest from the centre of the curve.

Learn more about inertia:

brainly.com/question/2286502

brainly.com/question/691705

#LearnwithBrainly

Answer:

Inertia

Explanation:

I got it right on the quiz! Good luck.

Answer:

13 m/s

Explanation:

Momentum is conserved, so initial total momentum = final total momentum.

m₁ u₁ + m₂ u₂ = m₁ v₁ + m₂ v₂

Since Car B is originally not moving, u₂ = 0.

m₁ u₁ = m₁ v₁ + m₂ v₂

Since the cars stick together, they have the same final velocity, so v₁ = v₂ = v.

m₁ u₁ = m₁ v + m₂ v

m₁ u₁ = (m₁ + m₂) v

Given that m₁ = 1800, m₂ = 1500, and v = 7.1:

1800 u₁ = (1800 + 1500) 7.1

u₁ = 13

Car A was travelling at 13 m/s.

Answer:

its cognitive- behavioral psychology

hope u have a good day!! :)

Answer:

D

Explanation:

just did the test

Answer:

Reflection impacts a change in direction of waves when they bounce off a barrier. When a wave confronts a barrier with a hole or gap, which is much smaller than the wavelength, the wave bends and spreads out as a spherical circular wave.

Explanation:

If you have any questions feel free to ask in the comments - Mark

Also when you have the chance please mark me brainliest.

Answer:

Reflection impacts a change in direction of waves when they bounce off a barrier. When a wave confronts a barrier with a hole or gap, which is much smaller than the wavelength, the wave bends and spreads out as a spherical circular wave.

Explanation:

Answer: P = V^2 /R

Explanation:

P = IV

I = V/R

P = V^2 /R

Answer:

The amount of water vapor in the air is called absolute humidity. The amount of water vapor in the air as compared with the amount of water that the air could hold is called relative humidity. This amount of space in air that can hold water changes depending on the temperature and pressure.

The amount of water vapor in the air is represented by the term 'relative humidity'. This is the ratio of the current amount of water vapor to the maximum amount that the air could hold at that temperature, typically expressed as a percentage. The saturation point or the temperature at which the relative humidity becomes 100% is known as the 'dew point'.

The measure of the amount of water vapor in the air refers to the concept of relative humidity. This is the ratio of the current amount of water vapor in the air (vapor density) to the maximum amount the air can hold at that temperature (saturation vapor density).

Relative humidity is expressed as a percentage. For example, if the air contains 9.40 g/m³ of water vapor, we would look up the saturation density for the current temperature. Let's say at 10.0°C, the saturation density is 9.40 g/m³. This means the air is holding as much water vapor as it can at that temperature, so the relative humidity is 100%. This temperature is known as the dew point.

As another example, if the air temperature rises or falls, it can change the amount of water vapor the air can hold, and thus change the relative humidity. This is why relative humidity often changes over the course of a day as the air temperature changes.

https://brainly.com/question/10849972

#SPJ5

Answer:

A low frequency sound (say, 50 hz) might sound like a low rumble, while a high frequency sound (say 12,000 hz), might sound more like a "sizzle". ... The higher the frequency, the shorter the distance between each successive compression (or rarification) in the incoming sound wave. This distance is called the "wavelength".

Explanation:

The number of cycles per second (Hertz) (abbreviated as, hz) of anything that oscillates is called the "frequency". The electricity of an AC wall outlet is said to have a frequency of 60 Hertz as it cycles negative then positive 60 times each second.

Sound is an oscillating wave, but it has a broad range of frequencies. A low frequency sound (say, 50 hz) might sound like a low rumble, while a high frequency sound (say 12,000 hz), might sound more like a "sizzle". A person with normal hearing can hear all the way up to about 20,000 hz.

Sound is actually more like "compression" waves, rather than waves on the ocean. When something makes a sound, the air is compressed or rarified in waves that travel out from that source in all directions. When those compressed or rarified areas of air hit your eardrum, it vibrates in sympathy with those compression waves in the air and allows you to hear.

The higher the frequency, the shorter the distance between each successive compression (or rarification) in the incoming sound wave. This distance is called the "wavelength". Sound travels at about 750 miles/hour, so the compression waves between 100 hz and 20,000 hz have wavelengths that range between several feet (for the 100 hz sound) to a fraction of an inch (for the 20,000 hz sound).

Speech also has a range of frequencies, but it mostly limited to the range between a hundred (or so) hz and 8,000 (or so) hz. The frequencies that make up vowel sounds are typically lower frequencies, while the consonant sounds (at least the parts that help us hear which consonant sound was spoken) tend to be higher frequency sounds.

People with even moderately good hearing up to about 3,000 hz can understand speech fairly well. Wired telephones typically do not transmit sound above 3,500 hz.

When people have a hearing loss, they usually have less ability to hear some frequencies than to hear other frequencies. This creates a distortion that can make it difficult to understand speech. Usually, people with hearing loss have poorer hearing in high frequencies than in low frequencies, but some people may lose lower frequencies, or even middle frequencies, while having less loss in other frequencies.

Hearing aids now have the ability to be tuned to amplify different frequencies by differing amounts, so that it fills in where you need the amplification without giving you too much sound in frequencies where you hear better.

The low frequency wave has longer wavelength and less energy compare to high frequency waves.

The frequency of a repeated event is its number of instances per unit of time. It differs from angular frequency and is sometimes referred to as temporal frequency for clarification. The unit of frequency is hertz (Hz).

A wave's wavelength and frequency are inversely proportional. Accordingly, waves with high frequencies have a short wavelength, whereas waves with low frequencies have a longer wavelength.

Very, very short wavelengths characterize light waves. While blue and purple light have even shorter waves with wavelengths around 400 or 500 nanometers (nm), red light waves have wavelengths about 700 nm. With wavelengths ranging from millimeters to kilometers, radio waves, another kind of electromagnetic radiation, have far longer waves than light.

Learn more about frequency  here:

https://brainly.com/question/5102661

#SPJ3

The acceleration is [tex]-3.1 m/s^2[/tex]

Explanation:

The acceleration of an object is the rate of change in velocity of the object.

Mathematically, it is given by

[tex]a=\frac{v-u}{t}[/tex]

where

u is the initial velocity

v is the final velocity

t is the time taken for the velocity to change from u to v

For the car in this problem, we have:

u = +20 m/s

v = 0 (because the car comes to a stop)

t = 6.5 s (time taken)

Therefore, the acceleration is

[tex]a=\frac{0-(+20)}{6.5}=-3.1 m/s^2[/tex]

Where the negative sign means that the direction of the acceleration is opposite to the direction of the initial velocity.

Learn more about acceleration:

brainly.com/question/9527152

brainly.com/question/11181826

brainly.com/question/2506873

brainly.com/question/2562700

#LearnwithBrainly

Answer:

The answer is A!

Explanation:

A is for A+! I also got the correct answer on UsaTestPrep!

She can climb 0.92 m without losing weight.

Explanation:

Gravitational potential energy is the energy consisting of the product of mass, gravity and height.

1 cal = 4184 J

140 cal = 585760 J

Energy = 585760 J,  m = 65.0 kg = 65000 g,   Efficiency = 20 %

                                  GPE = mgh

where m represents the mass

           g represents the gravity,

           h represents the height.

                             585760 = 65000  9.8  h

                                        h = 0.92 m.

Answer:

Force in the x component = 303.1[N]

Force in the y component = 175[N]

Explanation:

For the force of 350[N], we have the following components according to the angle.

[tex]F_{x}=350*cos(30) = 303.1[N]\\ F_{y}=350*sin(30) = 175[N]\\[/tex]

The components of the 350 N force acting on a box at a 30° angle are approximately 303 N horizontally and 175 N vertically, calculated using trigonometric functions.

To find the components of the force being applied to a 45 kg box that is pulled by a rope at an angle of 30 degrees, we can use trigonometric functions. Given a force of 350 N, we can break this force down into horizontal (x-component) and vertical (y-component) components. The horizontal component (Fx) is found using cosine function, and the vertical component (Fy) is found using sine function.

The horizontal component (Fx) is:
Fx = F × cos(θ) = 350 N × cos(30°)

The vertical component (Fy) is:
Fy = F × sin(θ) = 350 N × sin(30°)

Next, we calculate these values:

Therefore, the components of the force are:

Answer:

hunger or mutation

Explanation:

If food suddenly becomes more available, the population of an organism might increase (population boom), potentially face increased predation, and show altered genetic variation in future generations.

If food suddenly became more abundant for an organism, several potential outcomes could occur, largely dependent on the specific conditions of a species' environment.

Broadly, one would expect the organism's population to increase due to increased resources for growth and reproduction. This is called a population boom. This is because with more food available, more individuals can be sustained and reproductive success may be higher.

Furthermore, if a species is heavily preyed upon and suddenly has more food available, it may face increased predation; predators may not avoid eating this suddenly more abundant prey. However, these effects can also sometimes be offset by an increased individual health and reproductive success in the prey species, allowing its population to persist or even grow despite increased predation.

Lastly, a sudden increase in food can also change the genetic variation within the population. If food was scarce and suddenly becomes abundant, organisms that were historically well-adapted for survival in harsh conditions might not be as well-adapted to the new conditions. This could potentially increase genetic variation in the future generations.

https://brainly.com/question/32135442

#SPJ2

The initial velocity of go-kart is 2.5 m/s.

Explanation:

Here, the uniform acceleration of go-kart is given as 0.5 m/s². Also the time required by it to stop is also given as 5 s. As acceleration is the measure of change in velocity per unit time.

In this case, the velocity should be changed from a value to zero to come to rest. So the initial velocity will be positive value and final velocity is zero.

As we know the values of acceleration, final velocity and time, the initial velocity can be easily determined as follows.

[tex]Acceleration = \frac{Final velocity -Initial velocity}{Time}[/tex]

Since, final velocity is zero, acceleration is 0.5 m/s² and time is 5 s, then,

        [tex]-0.5=\frac{-\text {Initial velocity}}{5}[/tex]

        Initial velocity = 0.5 × 5 = 2.5 m/s.

So the initial velocity of go-kart is 2.5 m/s.

Answer:

The frequency would double.

Explanation:

Given:

Speed of wave (v) = constant.

Frequency of wave initially (f₁) = 2 Hz

Initial wavelength of the wave (λ₁) = 1 m

Final wavelength of the wave (λ₂) = 0.5 m

Final frequency of the wave (f₂) = ?

We know that the product of wavelength and frequency of the wave is equal to the speed of the wave.

Therefore, framing in equation form, we have:

Wavelength × Frequency = Speed

[tex]\lambda\times f=v[/tex]

It is given that speed of the wave remains the same. So, the product must always be a constant.

Therefore,

[tex]\lambda\times f=constant\ or\ \\\lambda_1\times f_1=\lambda_2\times f_2[/tex]

Now, plug in the given values and solve for 'f₂'. This gives,

[tex]1\times 2=0.5\times f_2\\\\f_2=\frac{2}{0.5}=4\ Hz[/tex]

Therefore, the final frequency is 4 Hz which is double of the initial frequency.

f₂ = 2f₁ = 2 × 2 = 4 Hz

So, the second option is correct.

Answer:

The answer is C The frequency would double.

Explanation: