scientific observations should be reported with bias as long as they benefit a scientist's employer

True

False

Milli- ... thousandth ... 0.001

Centi- ... hundredth ... 0.01

Micro- ... millionth ... 0.000 001

Kilo- ... thousand ... 1,000

Mega- ... million ... 1,000,000

Answer: Radiation.

In Radiation heat transfer, no particles are involved to transfer the energy unlike conduction and convection. This means that the energy transfer by radiation work when objects are not touching even in the space

1. We are wormed by sun, even though it is millions of kilometers away is the space.

2. Infrared camera give images even in dark, because they are detecting infrared light not the visible light.

Answer:

Explanation:

first notice some physics; the mass of the ball (projectiles) is not germane. A 2 ton elephant launched at U = 28 m/s will go just as high, which is H = U^2/2g = 28^2/(2*9.8) = 40 meters.

The process of calculating the height reached by the ball involves equating the kinetic energy at the beginning of its trajectory with the potential energy at its highest point. By assigning values to the mass and initial speed variables in the equation (1/2 × m × v² = m×g×h), we find that the ball reaches a height of approximately 40 meters.

The subject of this question is physics, specifically a concept known as projectile motion. When Dave throws the tennis ball straight up into the air, the ball has initial kinetic energy but loses this energy as it gains potential energy, causing it to decelerate until it reaches its maximum height and momentarily stops before falling back down.

We can calculate the height using the formula for kinetic and potential energy. The initial kinetic energy (K.E) is given by the formula 1/2 × m × v², where m is the mass of the ball and v is the initial velocity of the ball. The potential energy (P.E) at the highest point is given by the formula m×g×h, where g is the acceleration due to gravity and h is the height. Therefore, the initial kinetic energy equals the maximum potential energy (1/2 × m × v² = m×g×h)

Since we know the mass (0.07 kg) of the ball and the speed (28 m/s) at which it was thrown, we can substitute these values into the equation to calculate the maximum height, h.

So, h = (1/2 × m × v²) / (m×g) = (1/2 × 0.07 kg × (28 m/s)²) / ( 0.07 kg × 9.8 m/s²). Therefore, the tennis ball will reach a height of approximately 40 meters.

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Position ' C ' is the middle of the swing.  That's where the weight is the lowest.

It's also the place where the weight is moving the fastest, so that means it's the place where the kinetic energy is greatest.

Answer:

At point C

Explanation:

The velocity of the pendulum is maximum at its mean position, i.e., at C.

Formula for Kinetic energy is given by

[tex]K = 1\div 2\times m\times v^{2}[/tex]

As velocity is maximum at C so kinetic energy is also maximum at C.

There are no statements that describe the Curies' work well on the list of choices you provided.

(And their name was "Curie", not "Cutie".)

there is  no answer choices

63x1/2 + 65x0.3 + 67x1/5

=

64.4 average atomic mass

p=m•v=25•4=100 kg•m/s

As asked in question the momentum of the 25kg object moving at 4 m/s is 100 kilogram meters per second (kg·m/s).

To calculate the momentum of a 25-kilogram object moving at a speed of 4 meters per second, you can use the formula for momentum:

Momentum (p) = Mass (m) × Velocity (v)

Where:

Mass (m) is 25 kilograms (kg)

Velocity (v) is 4 meters per second (m/s)

Now, plug in these values:

Momentum (p) = 25 kg × 4 m/s = 100 kg·m/s

So, the momentum of the 25kg object moving at 4 m/s is 100 kilogram meters per second (kg·m/s).

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B. model; it is the model of the sun

Answer: B

Explanation: a light bulb

Given data

height (h) = 25 m ,

velocity (v) = ?

we know that,

                     v²-u² = 2as

                      initial velocity (u) = 0,

                                                a = g = 9.8 m/s ,

                  Now the equation becomes,

                                     v² = 2 × g × h

                                         = 2 × 9.8 × 25

                                     v² = 490.5

                                     v = √490.5

                                    v = 22.1 m/s

Therefore answer is C , i.e., 22 m/s (If you like this procedure, give me brainiest)

Answer:

c

Explanation:

The superior and inferior vena cava are the two main blood vessels that bring de-oxygentated blood back to the heart after the blood's done a circuit of the body to offload its oxygen to organs and muscles and tissues and cells, etc. The blood from these vessels enters the right atrium of the heart. Once the atrium is full of blood it contracts, pushing the blood through the open tricuspid valve into the right ventricle of the heart. The tricuspid valve closes shut once the blood is in the right ventricle, preventing the blood from returning to the right atrium. While the valve is closed, the ventricle contracts, pushing the blood out of the heart through the pulmonic valve, into the pulmonary artery, where it is carried directly to the lungs where it gets a new supply of oxygen attached to it. The freshly oxygenated blood courses along the pulmonary vein from the lungs back to the heart, entering the heart's left atrium. When the left atrium is full of blood, it empties by contraction, through the open mitral valve, into the left ventricle of the heart. The mitral valve then closes, so the blood cannot retrace its path. The left ventricle then contracts, pushing the blood out of the heart through the aortic valve into the big blood vessel called the aorta, from where it courses round the body delivering oxygen again.

Answer:

Explanation:

m1=3600 kg

m2=900 kg

G1=m1g

G2=m2g

G2/G1=m2g/m1g=m2/m1=3600/900=4

Answer:

The answer is B. 1/4

Explanation:

Both objects are on the same planet therefore gravity acts the same upon each.

Object C mass is 3600 kg.

Object D mass is 900 kg.

The mass of Object C is 4 times the mass of Object D. (3600 / 900=4)

The mass of Object D is 1/4 times the mass of Object C. (900 / 3600=1/4)

Mass is proportional to weight. The more the mass, the more the weight.

Object C is heavier. Object D is lighter.

It's asking for the weight ratio of Object D to Object C therefore 900 is divided by 3600 to come to 1/4.

X

Hot air rises = it's less dense than cold air = falls

Answer: X

Explanation:

In the given diagram, air moves as a result of convection currents. The air at the bottom, near the space heater gets heated up. As temperature rises, the density of air reduces. It becomes less dense and rises up. The least dense is at W. As the air rises, it gets cooled and becomes more dense and heavier and thus, sinks down. The highest density of air would be at X.

This can be viewed as a decrease in the wavelength of the wave. A decrease in wavelength at a constant speed is associated with an increase in frequency since waves follow the equation v=f*λ, where λ is the wavelength and f is the frequency.

Answer:

Force  = 375 Newton or 375 kg m/s²

Explanation:

Force is the product of the mass of a body and the acceleration . Force is usually the push or pull of the mass of an object that is accompanied by the motion(acceleration). Force is a vector quantity  because it has both magnitude and direction. Example is when you throw a ball you apply a push, with the mass of the ball and the acceleration computed you can calculate the force applied .

Mathematically, force can be represented as

Force = mass × acceleration

F = ma

Force is measured in Newton or Kg m/s²

From the question;

mass  = 125 kg

acceleration = 3 m/s²

Force = 125 × 3 = 375 Newton or 375 kg m/s²

Force  = 375 Newton or 375 kg m/s²

Answer:

Gravity pulls objects toward Earth.

The rate of acceleration due to gravity is 9.8 m/s2.

Weight on Earth’s surface is a result of gravity’s pull.

Explanation:

these are the answers for e2020

Gravity is a fundamental force that gives weight to objects and causes freefall. On Earth, it also causes the ocean tides and affects time, making it pass slower closer to Earth's surface. In our universe, it plays a vital role in the dynamics of celestial bodies.

Gravity is a force of attraction that exists between any two masses, any two bodies, any two particles. It is mathematically described as: F = G *(m1*m2)/r^2 where F is the force of attraction between the two bodies, m1 and m2 are the two masses, r is the distance between the centers of the two masses and G is the gravitational constant.

On Earth, gravity gives weight to physical objects and causes the ocean tides. The force of Earth's gravity comes from the object's mass and the acceleration due to gravity, which is approximately 9.8 m/s^2 at sea level. When an object is in freefall, the only force acting upon it is gravity.

Gravity also affects time and space, causing time to pass more slowly closer to the surface of the Earth compared to further away. This concept is known as time dilation. In essence, gravity is a crucial force that plays a key role in the structure and lifecycle of planets and the orbital movement of celestial bodies.

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W = work done by the spring on the toy car = 196 Joules

m = mass of the toy car = 2 kg

v₀ = initial velocity of the car when at rest = 0 m/s

v = final velocity of the car after spring does work on it = ?

According to work-change in kinetic energy, net work done on an object is same as the change in kinetic energy of the object . hence

Net work done = Final kinetic energy - initial kinetic energy

W = (0.5) m (v² - v₀²)

inserting the values

196 = (0.5) (2) (v² - (0)²)

v² = 196

v = sqrt(196)

v = 14 m/s

The final velocity of the toy cars is 14 m/s

Given data:

The mass of toy car is, m = 2 kg.

The work performed by the spring is, W = 196 J.

In the given problem, the work done by the spring provides the necessary kinetic energy to the toy car. Therefore, work -energy theorem can be applied.

According to work-energy theorem, the work done on an objects is equal to the change in kinetic energy of the object .So,

W = KE

Solving as,

[tex]W = \dfrac{1}{2} mv^{2} \\\\196=\dfrac{1}{2} \times 2 \times v^{2}\\v = 14 \;\rm m/s[/tex]

Thus, we can conclude that the final velocity of the toy cars is 14 m/s .

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Given that:

Mass (m) = 20 g = 0.02 Kg,

temperature (T₁) = -10°C = -10+273 = 263 K

temperature (T₂) = 10°C = 10+273 = 283 K

Specific heat of water (Cp) = 4.187 KJ/Kg k

We know that Heat transfer (Q) = m. Cp.( T₂ - T₁)

                                                    = 0.02 × 4.187 × (283-263)

                                                 Q = 1.67 KJ

Heat transferred is 1.67 KJ

It takes fossil fuels to form millions of years thats why they are regarded as non-renewable socrce of fuels

Answer: 2.3 m/s/s

Explanation:

The car is traveling at a constant speed of 12 m/s and after acceleration, the speed is 26 m/s so the acceleration of the car will be 2.33 m/s².

The ratio of velocity to time is referred to as acceleration. It is a vector quantity with SI unit m/s².

There are several types of acceleration :

According to the question,

The initial velocity of the car, (u) is given as 12 m/s,

The final velocity of the car, (v) is given as 26 m/s and,

The time, (t) is given as 6 seconds

Use the equation of motion,

v = u + at

26 = 12 + (a)6

a = 14/6

a = 2.33 m/s².

Hence, the acceleration of the car is 2.33 m/s².

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Answer:

tim e (t) = 20 min.

            = 20 × 60 = 1200 s ,

Work ( W) = 4560000 J

                 = 4560 KJ ,

Determine:

                 Power output (P) = Work ÷ time

                                              = 4560 ÷  1200

                                            P  = 3.8 KW

Question: Two 1-kg point masses a distance d apart each exert a gravitational attraction F on the other one. If 1 kg is now added to each mass, the gravitational attraction exerted by each will be

Answer: 4f

Explanation:  a gravitational force is propotional to a square of distance between two point masses so we separate the masses to a distance

question answered by

(jacemorris04)

We know that the gravitational force is proportional to (m₁) · (m₂).

Now we want to know the force between (2·m₁) · (2·m₂).

Well, that's just the same as (2·2) · (m₁)·(m₂), which is  4 · (m₁)·(m₂) ... four times the original force.

So in this question, the new pair of gravitational forces will be 4·F in each direction.

Answer:

1.6 kg

Step-by-step Solution:

Since Force = mass × acceleration we have:

F = 8N

a= 5 m/s^2

m = ?

By plugging the values above into F=ma we obtain:

[tex]F=ma\\\\8=m(5)\\\\\frac{8}{5}=\frac{m(5)}{5}\\\\m=\frac{8}{5}=1.6[/tex]

Therefore, the Chromebook has a mass of 1.6 kilograms.

Using Newton's second law of motion, we estimate that the mass of the chromebook would be 1.6 kg if it is thrown with a force of 8N and an acceleration of 5m/s².

In order to find the mass of the chromebook, we can use Newton's second law of motion, which states that Force equals Mass times Acceleration (F = ma).

If Mrs. Reichelt throws the chromebook with a force of 8N and it accelerates at 5m/s2, we can rearrange the equation as follows: Mass equals Force divided by Acceleration (m = F/a).

m = 8N / 5m/s2

As a result, the mass of the chromebook is 1.6 kg.

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the ball's momentum is 10 × 1.5 = 15 kg m/s

Answer : The momentum of ball is, 15 kg.m/s

Explanation :

Momentum : It is defined as the motion of a moving body. Or it is defined as the product of mass of velocity of an object.

Formula of momentum is:

[tex]p=mv[/tex]

where,  

p = momentum  = ?

m = mass  = 1.5 kg

v = velocity = 10 m/s

Now put all the given values in the above formula, we get:

[tex]p=(1.5kg)\times (10m/s)[/tex]

[tex]p=15kg.m/s[/tex]

Therefore, the momentum of ball is 15 kg.m/s

The number-labels don't show in the picture, so we don't know the number of the correct one.

The correct path is the one shown in the upper-right panel.  The path of the light beam forms the shape of the letter ' V ', with the point at the bottom, down on the book.

Answer:

3.339 N

Explanation:

In this problem, the box is moving at constant velocity, so the box is in motion and therefore we can consider only the kinetic friction.

The resultant of the forces acting on the box must be equal to the product of mass and acceleration:

[tex]F_{net}=ma[/tex]

However, the box is moving at constant velocity, so the acceleration is zero: a=0. Therefore,

[tex]F_{net}=0[/tex] (1)

There are two forces acting on the box:

- The push: F

- The kinetic friction on the box, equal to

[tex]-\mu_k mg[/tex]

where [tex]\mu_k = 0.1113[/tex] is the coefficient of kinetic friction and (mg)=30 N is the weigth of the box, and where the negative sign means it is in the opposite direction of the motion.

Therefore, eq.(1) becomes

[tex]F-\mu mg =0\\F= \mu mg=(0.1113)(30 N)=3.339 N[/tex]

The answer is Radio Waves

Velocity = (distance covered in a direction) / (time to cover the distance)

Since the y-axis is position (distance), the speed at 3 seconds is the slope of the graph at 3 seconds, and NOT its y-value.

The slope is fairly easy to pick off, because the graph is so straight from 2 sec to 5 sec.  During that time, the distance shrinks by 10 meters (from 10m to zero).  So the slope of that whole piece of the graph is  (-10m) / (3 sec).

That's a slope of  (10/3 m/s) or 3.33 m/s .

In answer to the question, we can only give the speed at 3 sec, not the velocity, since we have no information about the direction of the motion.  Consequently, I would call the speed a positive number.  But it's not worth arguing about, so you should just select choice-A and not make a big scene.

The velocity at 3 seconds can't be determined accurately without additional information such as acceleration and the initial velocity. Velocity in physics depends on these additional factors, meaning a correct answer can't be given with the given information.

Without more information, it's impossible to accurately determine the velocity at 3 seconds. In physics, velocity is a measure of speed in a specific direction and it depends on acceleration, the initial velocity, and the time elapsed. Not having any of this additional information means we can't give a correct answer. As such, any of the choices (A, B, C, D, E) could be potentially correct depending on the circumstances of the object's movement.

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Answer:

(C) (see image of it attached)

Answer: circuit C

Explanation:

A DC voltage source supplies current in single direction. It is represented by alternate small and big straight lines.

An Ac voltage source supplies alternating current i.e. the current changes direction.

In the given circuit diagrams, only circuit C has a DC voltage source.

The initial speed doesn’t matter.  To reach the maximum height, you need to launch straight up ... 90 degrees above horizontal.

Answer:

90 degree

Explanation:

The height for the projectile motion is given by

H = u^2 Sin^2 theta/ 2g

Height is maximum when sin theta is maximum.

Sin theta is maximum when it's value is 1.

So the value of theta is 90 degree.

Answer:

the second one

Explanation:

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