Imagine that you lived in a dot on the surface of an expanding balloon, and as you looked to more distant dots, you observed the following:
A dot at a distance of 5 centimeters from you is moving away from you at a speed of 1 centimeter per hour (1 cm/hr).
A dot at a distance of 10 centimeters from you is moving away from you at a speed of 2 centimeters per hour (2 cm/hr).
A dot at a distance of 15 centimeters from you is moving away from you at a speed of 3 centimeters per hour (3 cm/hr).
Which equation below correctly states the relationship between the dot distances and speeds as observed by you?

Answer:

True

Explanation:

The absence of external force in the outer space, allows the piece of rock to continue moving at the same velocity for thousands of years.

The outer space is almost an absolute vacuum, because it's nearly empty. There is no matter such as air in the outer space that will provide an external force needed to change the velocity of the piece of rock.

From Newton's first law of motion, an object in a state of rest or uniform motion in a straight line, will continue in that state unless it is acted upon by an external force.

Thus, the absence of external force in the outer space, allows the piece of rock to continue moving at the same velocity for thousands of years.

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Answer:

inertia

Explanation:

Explanation:

Mostly in metamorphic or lava materials is uranium-238 contained. Then no fossil could be estimated utilizing U 238 specifically. They should never be used combined due to the huge variations in the half-life of Carbon 14 with Uranium-238. It is only possible to be using carbon 14 to classify fossil from a very current generation.

When an electromagnet is placed nearby, the paper clips move towards it due to magnetic domains within the paper clips aligning with the magnetic field.

Magnetic domains are tiny regions within a material's atoms where the magnetic poles are aligned in the same direction, creating a magnetic field. As the electromagnet produces its own magnetic field, the magnetic domains within the paper clips become attracted to the electromagnet’s field, causing them to move towards it. The paper clips do not become magnetized themselves, as the magnetic field created by the electromagnet is too weak to cause permanent alignment of the magnetic domains within the paper clips.

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Answer:

true

Explanation:

The Fujita or Fujita-Pearson scale is majorly used to measure the intensity of the tornadoes. It takes into account the degree of destruction which is caused by the tornado in structures built by men.

On the other hand, the intensity of hurricanes is measured using the Saffir-Simpson scale, which classifies them from level 1 (the lowest) to level 5 (the highest) depending on the strength of the winds.

The Fujita Scale (F Scale) also known as the Fujita-Pearson Scale (FPP Scale) measures and classifies the intensity of tornados. The scale bases and its rating on the destruction caused by the tornado. The scale recently was modified in the United States in 2007. It was renamed it as the Enhanced Fujita Scale (EF Scale).

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Answer: See Explanation

Explanation:

Did the car travel at a constant speed?

This means "Is the speed at each interval the same?"

There are 10 intervals for which to calculate from.

For each one, the speed is the distance traveled divided by the time.

Each interval is 1 meter long (distance).

1st: 1 meter / 2.00 s = 0.5 m/s

2nd: 1 meter / (4.00 - 2.00) s = 0.5 m/s

3rd: 1 meter / (6.2 - 4.0) s = 0.454 m/s

Right here you can see that the speed is different, NO is the answer.

Average Speed = total distance divided by total time

v = d / t     v = (10 m) / (20:00 s) = 0.5 (m/s)

Describe the overall motion: (continue on with step one to see the total motion over the 10 meters)

4th: 0.552

5th: 0.472

6th: 0.5

7th: 0.5

8th: 0.4975

9th: 5.39

10th: 0.55

Overall motion stayed steady from 0-2 meters, slowed for the 3rd meter, sped up for the 4th, slowed down the 5th, stayed steady until slowing down in the 8th meter, then increased speed til the 10th meter.

Races would be practical applications to see where people/cars pace themselves, push themselves, etc.

The index of refraction of the unknown material is 1.5.

The index of refraction (n) of a medium is defined as the ratio of the speed of light in a vacuum (c) to the speed of light in the medium (v):

n = c / v

In this case, the speed of light in the unknown material is given as 2.00 × \(10^8\) m/s. The speed of light in a vacuum is approximately 3.00 × \(10^8\) m/s. Substituting these values into the formula:

n = (3.00 × \(10^8\) m/s) / (2.00 × \(10^8\) m/s)

Simplifying the expression:

n = 1.5

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The can collapses because of the difference in air pressure between the inside and outside of the can and the decrease in air pressure inside the can caused by the condensation of the steam.

Here when the teacher cools the can, some of the steam turns back into water, and as a result, the air pressure inside the can decreases. The reason for this is due to the collisions as when the steam condenses back into water, due to a decrease in the air pressure,

Hence, the can collapses because of the difference in air pressure between the inside and outside of the can and the decrease in air pressure inside the can caused by the condensation of the steam.

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Answer:

Dont

Explanation:

Know

the circumference of the CD is moving at a constant speed of 120 cm/s when the CD is rotating at a constant angular speed of 20 radians per second.

The circumference of the CD can be calculated using the formula C = πd, where d is the diameter. So, for a CD with a diameter of 12.0 cm, the circumference is C = π(12.0 cm) = 37.7 cm (rounded to one decimal place).
The linear speed of a point on the circumference can be found using the formula v = ωr, where ω is the angular speed and r is the radius of the circle. Since the radius of the CD is half the diameter, it is 6.0 cm.
So, the linear speed of a point on the circumference is v = (20 rad/s) x (6.0 cm) = 120 cm/s.

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Answer:

It would be considered a close circuit when the circuit is off

The magnitude of the vector displacement is 15.65 m.

The resultant force acting on the object is calculated as follows;

\(F = \sqrt{F_x^2 + F_y^2} \\\\F = \sqrt{4^2 + 6^2} \\\\F = 7.21 \ N\)

The displacement of the vector is calculated as follows;

W = Fs cosθ

\(s = \frac{W}{Fcos(\theta)} \\\\s = \frac{106}{7.12 \times cos(18)} \\\\s = 15.65 \ m\)

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Answer:

Its either B or A

Explanation:

Answer:

these organs make up four fifth's of it's body, and gives the electric eel ablity to generate two types of electric organ discharges:low voltage and high voltage

Answer:

The work done on the box is 100 Nm, and the power is 20 Nm/s.

Electromagnetic waves are a type of energy that travels through space in the form of oscillating electric and magnetic fields.

An increase in frequency also causes an increase in the electromagnetic wave's energy in addition to a shorter wavelength.\

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The concentration of salt in water affects the specific heat capacity by changing the thermal properties of the solution, causing it to require less heat to be raised in temperature.

The specific heat capacity of water is the amount of heat required to raise the temperature of a certain mass of water by 1 degree Celsius. The concentration of salt in water affects its specific heat capacity because the presence of ions in the solution changes the thermal properties of the water.

As the concentration of salt in water increases, the specific heat capacity of the solution decreases. This is because the ions in the salt solution require less heat to be raised in temperature than pure water molecules. Additionally, the ions in the salt solution also increase the mobility of water molecules, causing them to transfer heat more efficiently and therefore, the heat energy required to raise the temperature of the solution is reduced.

It should be noted that the effect of salt concentration on specific heat capacity is small, and significant changes in specific heat capacity usually require very high salt concentrations. Nevertheless, the change in specific heat capacity can have a significant impact on the thermal dynamics of systems such as oceans, which contain high salt concentrations.

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Answer:

blue

Explanation:

blue is the only color being reflected, meaning it's the only one that will be visible

The work delivered by the engine to the winch in kW is 19.6 kW and the rate at which fuel is consumed by the engine is 13.2 g/s.

Let the power output of the engine be P kW.

Work done per second = power = P kW

The heat produced by fuel per second = P/η1,

where η1 is the efficiency of the engine = 0.35

Amount of fuel consumed per second = Heat produced per second / Heating value of fuel = P / (η1 * Heating value of fuel) kW/kg/s = P / (0.35 * 40 * 106) kg/s = P / 14 * 106 kg/s

Given,

load lifted = 1000 kg, vertical speed = 2 m/s

The work done by the engine is given by work = Force * distance

The force required to lift the load = Weight of the load = mass * acceleration due to gravity (g) = 1000 * 9.8 N = 9800 NA vertical speed of 2 m/s means that the load has traveled a distance of 2 m in one second.

Work done per second = power = force * distance / time = force * speed = 9800 * 2 = 19600 NWatts = 19600 J/s = 19.6 kW

(a) The work delivered by the engine to the winch in kW = 19.6 kW

(b) The rate (g/s) at which fuel is consumed by the engine = 19.6 / 14 * 106 = 0.0132 kg/s = 13.2 g/s

Therefore, the work delivered by the engine to the winch in kW is 19.6 kW and the rate at which fuel is consumed by the engine is 13.2 g/s.

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If the wavelength of the wave is increased to 10m and the speed stays the same, the frequency of the wave will be halved i.e. 60Hz.

Wavelength is the length of a single cycle of a wave, as measured by the distance between one peak or trough of a wave and the next.

The wavelength is often designated in physics as λ, and corresponds to the velocity of the wave divided by its frequency.

λ = v/f

This equation reveals that the wavelength is inversely proportional to the frequency of a wave. Hence, if the wavelength of the wave in this question is increased to 10m, the frequency will decrease by half i.e. 60Hz.

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Answer:

The velocity is \(u = 19.1 \ m/s\)  

Explanation:

From the question we are told that

  The time taken by the ball is  t =  2.5 seconds

  The angle made with the horizontal is \(\theta = 40^o\)

Generally the vertical component of the initial velocity is mathematically represented as

         \(u_y = u sin (\theta )\)

Generally at maximum height of the ball the velocity is  v  =  0 m/s and  the time take to reach this maximum height is

    =>         \(t_m = \frac{t}{2} = \frac{2.5}{2} = 1.245 \ s\)  [This because t is duration for the to a fro travel of the ball]

Generally from kinematic equation

        \(v = u_y + gt\)

Here  \(g = -9.8 m/s^2\) given that the direction is against gravity

=>     \(0 = u sin (40) - 9.8 * [1.25]\)

=>     \(0 = 0.6428u - 12.25\)  

=>     \(u = 19.1 \ m/s\)  

The mass of the seashell suspended by the two strands of spider silk is 0.28 kg.

The given parameters:

The mass of the seashell at equilibrium is calculated by applying Newton's second law of motion;

\(\Sigma F = 0\\\\T_1 sin(\theta) + T_2 sin(\theta) - W = 0\)

where;

The weight of the seashell is calculated as;

\(1.42 \times sin(75) \ + \ 1.42 \times sin(75) \ - W = 0\\\\2.743 - W = 0\\\\W = 2.743 \ N\)

The mass of the seashell is calculated as follows;

\(W = mg\\\\m = \frac{W}{g} \\\\m = \frac{2.743}{9.8} \\\\m = 0.28 \ kg\)

Thus, the mass of the seashell suspended by the two strands of spider silk is 0.28 kg.

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Answer:

C

Explanation:

because it's new chemical substances

Answer:

5.47 m/s

Explanation:

p=ma

575=105v

v=575/105

v=5.47 m/s

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Given a conducting rod that is 45.5 cm long and sliding on a pair of rails at a velocity of 3.25 m/s, we need to determine the magnitude and direction of the induced voltage when it passes through a magnetic field of 0.85 T.

To calculate the induced voltage, we can use Faraday's law of electromagnetic induction, which states that the induced voltage is equal to the rate of change of magnetic flux through the circuit. The formula for induced voltage is given by:

V = B * L * v

Where:

V is the induced voltage,

B is the magnetic field strength,

L is the length of the conducting rod perpendicular to the magnetic field, and

v is the velocity of the conducting rod.

In this case, the length of the rod perpendicular to the magnetic field is the same as the length of the rod itself, so L = 45.5 cm = 0.455 m. The magnetic field strength is given as 0.85 T, and the velocity is 3.25 m/s. Substituting these values into the formula, we have:

V = 0.85 T * 0.455 m * 3.25 m/s

V = 1.1368 V

Therefore, the magnitude of the induced voltage is approximately 1.1368 volts. The direction of the induced voltage can be determined using the right-hand rule, which states that if you point your right thumb in the direction of the velocity vector (from the rod's starting point to its endpoint), and your fingers in the direction of the magnetic field, then the direction in which your palm faces represents the direction of the induced voltage.

In conclusion, the magnitude of the induced voltage is 1.1368 volts, and the direction can be determined using the right-hand rule.

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Answer:

5.94m/s

Explanation:

Using the law of conservation of momentum;

mAuA+ mBuB = mAvA+mBvB

Substitute the given values

1.4(3.7) + 0.55(0) = 1.4(2.3) + 0.55vB

5.18 + 0 = 3.22 + 0.55vB

5.18 - 3.22 = 0.55vB

1.96 = 0.33vB

vB = 1.96/0.33

vB = 5.94m/s

Hence the velocity of Ball B be after the collision is 5.94m/s

Explanation:

A splint is lit and held near the opening of the tube, then the stopper is removed to expose the splint to the gas. If the gas is flammable, the mixture ignites. This test is most commonly used to identify hydrogen, which extinguishes with a distinctive 'squeaky pop' sound.

Answer:

You can test for hydrogen gas by putting a burning splinter near the gas. The splinter will gives out a 'pop' sound (mini explosion) if it is hydrogen gas

Answer:

3.91 s

Explanation:

From the question,

The height of the helicopter is given as

h = 3t²......................... Equation 1

After 5 seconds, The height of the helicopter is given as

h = 3(5²)

h = 3×25

h = 75 m.

Note: The small mailbag falls under gravity.

Hence,

h = ut + 1/2(gt²)....................... Equation 2

Where u = initial velocity of the mailbag, t = time, h = height, g = acceleration due to gravity of the mail bag.

Given: h = 75 m, u = 0 m/s ( at the maximum height).

Constant: g = 9.8 m/s²

Substitute these values into equation 2

75 = 0(t) +1/2(9.8t²)

solve for t

1/2(9.8t²) = 75

4.9t² = 75

t² = 75/4.9

t² = 15.31

t = \(\sqrt{15.31}\)

t = 3.91 s

"Increase its voltage and decrease its current" results change to a circuit that is most likely to decrease its electrical power.The correct option is C

Electrical power is calculated as the product of voltage and current (P = V * I). By increasing the voltage and decreasing the current, the overall power of the circuit will decrease.

The explanation for why the other options are not true:

A. Increase its voltage and increase its current: Increasing both voltage and current would result in an increase in electrical power. This contradicts the requirement of decreasing the power mentioned in the question.

B. Decrease its voltage and decrease its current: Decreasing both voltage and current would also result in a decrease in electrical power. This contradicts the requirement of decreasing the power mentioned in the question.

D. Decrease its voltage and increase its current: Decreasing the voltage and increasing the current would not necessarily lead to a decrease in power. Depending on the specific values of voltage and current, the power could increase or decrease. Therefore, this option does not guarantee a decrease in electrical power.

Hence, the correct answer is option C.

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