You weigh 660 N.
What would you weigh if the Earth were
two times as massive as it is and its radius
were five times its present value?
Answer in units of N.

Answer:

When wind flows across the blade, the air pressure on one side of the blade decreases. The difference in air pressure across the two sides of the blade creates both lift and drag. The force of the lift is stronger than the drag and this causes the rotor to spin.

Explanation:

To determine whether Daniel will be home before the storm hits, we need to determine the time it will take for the storm to reach Fort Collins and compare it to the time it will take for Daniel to reach home by bike.

Given:

Storm's speed = 25 km/hr = 25000 m/hr

Distance from Fort Collins = 75 km = 75000 m

Time of storm = distance / speed = 75000 m / 25000 m/hr = 3 hrs

If Daniel starts riding his bike home at 5:00pm, he needs to cover the distance from where he is to his home before the storm hits Fort Collins.

If he is able to maintain an average speed of 20km/h = 20000 m/h,

time = distance/speed = 75000 m/20000 m/h = 3.75 hrs

Since the storm will take 3 hours to reach Fort Collins and Daniel will take 3.75 hours to reach home by bike, he will be home before the storm hits.

The correct description of X is that it is a neutron (option C).

A nuclear reaction is a process such as the fission of an atomic nucleus, or the fusion of one or more atomic nuclei and/or subatomic particles in which the number of protons and/or neutrons in a nucleus changes.

In a nuclear reaction, the reaction products may contain a different element or a different isotope of the same element.

Certain particles are emitted or reacted with in a nuclear reaction. Examples of those particles are neutron, alpha particle, electron.

A neutron is a subatomic particle forming part of the nucleus of an atom and having no charge. A neutron posseses a mass number of 1 and atomic number of 0.

According to this question, uranium with mass number 235 and atomic number 92 undergoes a nuclear reaction with a particle with mass number 1 and atomic number 0.

The particle represented by X in this reaction is a neutron.

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Answer:

Light waves do not need a medium in which to travel but sound waves do. Explain that unlike sound, light waves travel fastest through a vacuum and air, and slower through other materials such as glass or water.

Explanation:

Light travels in a straight line as a wave. It does not require any medium or material to travel like sound waves which means it can travel in vacuum.The speed of the light  from the special theory of relativity is a constant value of 38x10^8m/second

Answer:given that-

Bullet mass= 11.9gr

gun mass= 2.1

Velocity of bullets= 235.1m/s

A/q,

satisfied-

law of conservation of momentum

pf=pi

(Mass of gun+ mass of bullets)reserve velocity= mass of bullets ×velo of bullets

=>( 2100+11.9)vr=11.9×235.1

=>(2111.9 )vr=2797.69

=>vr=297.69/2111.9

vr=1.32m/

The conductance is obtained here as 0.10 ohm -1.

We know that the usefulness of a metallic conductor lies in the ability of the conductor to be able to serve as a conduit for the passage of the electric current and this can be seen from the values of the conductivity as well as the conductance of the wire.

We know that;

K = σ a/l

σ = conductivity

a = cross sectional area

l = length

K = 0.65 ohm-1 cm-1 * 1.5 cm2/ 9.5 cm

K = 0.10 ohm -1

The wire would be found to have a conductance of 0.10 ohm -1.

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The most powerful ice breaker can work 2.016 × 10 ¹¹ Joule in 1.0 hour.

The quantity of energy moved or converted per unit of time is known as power in physics. The watt, or one joule per second, is the unit of power in the International System of Units. Power is also referred to as activity in ancient writings. A scalar quantity is power.

Power of the nuclear engine = 56 × 10⁶ W.

Time it works = 1 hour = 3600 second

Hence, work done by  this engine  in 1.0 hour =  56 × 10⁶ × 3600 Joule

= 2.016 × 10 ¹¹ Joule.

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The year that the CO level exceed the permissible limit is C. 2019

In the US, the permissible exposure limit is the maximum level of exposure to a chemical substance or physical agent, such as high levels of noise. The Occupational Safety and Health Administration establishes permissible exposure limits.

The maximum level of a substance to which a person can be exposed is known as the permissible exposure limit (PEL). When carbon monoxide levels in your bloodstream rise, carbon monoxide poisoning happens. Your body replaces the oxygen in your red blood cells with carbon monoxide when there is too much carbon monoxide in the air. Serious tissue damage or even death may result from this.

When gasoline, wood, propane, charcoal, or other fuels are burned, carbon monoxide, an odorless, tasteless gas, results. Appliances and engines that aren't properly ventilated, especially in a room that's tightly sealed or enclosed, can build up dangerous amounts of carbon monoxide.

In this case, the appropriate year is 2019.

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The work done by the engine is  2.016×10¹¹ J.

Work is said to be done whenever a force moves an object through a distance.

To calculate the work done by the engine, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the work done is  2.016×10¹¹ J.

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The amount of work which was done if the power developed during Esuke’s descent was 585.0 W is equal to 2,184,975 Joules.

The work done (W) by an object can be calculated by multiplying the force acting on it by the perpendicular distance covered by the physical object over a specific period of time. This ultimately implies that, work done (W) and energy (E) have the same unit i.e Joules (J).

Mathematically, the work done (W) by an object can be calculated by using the following formula:

Work done = power × time        

Additionally, we would convert the unit of time in minutes to seconds by multiplying by 60 seconds.

Substituting the given parameters into the work done (W) formula, we have the following;

Work done = 585.0 × 62.25 × 60

Work done = 2,184,975 Joules.

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A potter’s wheel moves from rest to an angular speed of the angular acceleration is 0.006 rad/s^2.

What is acceleration ?

Acceleration is the rate of change of velocity over time. It is the rate at which an object's speed, or the magnitude of its velocity, changes over time. Acceleration can be positive, negative, or zero depending on the direction of the velocity. For example, if an object is moving in a straight line and its speed increases,

it is said to have a positive acceleration; if its speed decreases, it has a negative acceleration. If the object's speed does not change, then the object is said to have a zero acceleration. Acceleration is a vector quantity, meaning it has both magnitude and direction.

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The work done by the boy against the gravitational force is 240000J.

Here given that,

Mass of the box (m) = 300 g

Height of table (h) = 80cm

Acceleration due to gravity (g) = 10 m/s²

Work done against gravitational force will be calculated by formula,

W = mgh

By substituting the values,

   = 300 x 10 x 80

   = 240000J

Therefore the work done by the boy is 240000J.

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The Steve’s peak speed after conversion from centimeter per second to kilometer per hour would be 2.6 km/h

The rate of change in distance over a certain period of time is the definition of speed. It has a distance by time dimension. You may calculate speed by multiplying the SI unit of length, which is meters, by the SI unit of time, which is seconds (seconds).

Multiplying a speed measurement in centimeters per second by the appropriate conversion ratio enables one to convert that speed measurement to kilometers per hour. You can convert using this simple method, which takes into account the fact that one centimeter per second is equivalent to 0.036 kilometers per hour:

kilometers per hour = centimeters per second × 0.036

                                 = 72.3 × 0.036

                                 =2.6 km/h

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The method that will give the most accurate measurement is P = l²R, because it has the least uncertainty.

The power dissipated in a circuit is given by the following formula as shown below.

P = I²R

P = VI

where;

Percentage uncertainty gives the error associated with each measurement. The greater the value of percentage uncertainty, the greater the error associated with the measurement.

To determine the method that will given the most accurate measurement, we will find out the method with least error.

For the first method, =  I²R

Total uncertainty for first method =  I²R = ( 0.5 % )² x ( 0.1 % ) = 0.0025%

Total uncertainty for second method = VI = ( 0.5% x 0.5 % ) = 0.25 %

Thus, the measurement with the least uncertainty is the first method, I²R.

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Answer:

T=80

Explanation:

soln

v=0.25ms

d=20m

t=?

therefore; velocity=distance/time taken

equating the valuables we have

0.25=20/t

making t the subject formula we have

t=20/0.25 => 80s

The distance (in Km) between the moonlet and the alien planet, given that the force of gravity acting on the moonlet due to the planet is 5.2×10¹⁶ N, is 9167.4 Km

We can obtain the distance between the moonlet and the alien planet by using the following formula:

F = GM₁M₂ / r²

Where

The following data were obtained from the question:

F = GM₁M₂ / r²

5.2×10¹⁶ = (6.67×10¯¹¹ × 6.3×10¹⁴ × 1.04×10²⁶) / r²

Cross multiply

5.2×10¹⁶ × r² = 6.67×10¯¹¹ × 6.3×10¹⁴ × 1.04×10²⁶

Divide both sides by 5.2×10¹⁶

r² = (6.67×10¯¹¹ × 6.3×10¹⁴ × 1.04×10²⁶) / 5.2×10¹⁶

Take the square root of both sides

r = √[(6.67×10¯¹¹ × 6.3×10¹⁴ × 1.04×10²⁶) / 5.2×10¹⁶]

r = 9167442.4 m

Divide by 1000 to express in Km

r = 9167442.4 / 1000

r = 9167.4 Km

Thus, we can conclude that the distance between them is 9167.4 Km

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Answer: 2.04 Seconds

Explanation:Use t=(2v)/g = (2)(10)/9.8 = 2.04 seconds

Answer:Assuming, The new circuit is like the circuit attached below, the current in the new circuit will be 0.1 Ampere.

Explanation: Given, We have Potential Difference of 1.5V, Current of 0.05A.

Now, we know V = I x R ,where V is potential difference, I is current and R is resistance in the circuit.

∴ Putting the values ⇒ 1.5V = 0.05A x R

⇒R  =  1.5/0.05

∴R = 30 Ω

Now, It is said that A same identical wire is connected in parallel with the previous wire.

∴ New R will be ⇒ [tex]\frac{1}{R(new)}[/tex] = [tex]\frac{1}{r} + \frac{1}{r}[/tex]

=[1/30] + [1/30]

=1/15

∴ 1/R(new) = 15 Ω

Now, New Current in the circuit will be:

⇒ V= IR

⇒1.5V =  I x 15

⇒I = 0.1 A

Therefore, Answer will be 0.1 ampere.

The car can take this curve at a speed of 18.8 m/s without skidding to the outside of the curve

The maximum speed at which a car can take a curved road without skidding outward is given by the formula:

v = √(g * r * (cos(theta) + (mu * sin(theta))/mu_s))

where:

v = velocity of the car

g = acceleration due to gravity (9.8 m/s^2)

r = radius of curvature of the road (36 m)

theta = angle of banking of the road (25 degrees)

mu = coefficient of friction between the tires and the road (0.87)

mu_s = coefficient of static friction between the tires and the road (0.87)

So the maximum speed at which the car can take this curve without skidding is:

v = √(9.8 * 36 * (cos(25) + (0.87 * sin(25))/0.87))

v = √(9.8 * 36 * (0.9063 + 0.4696))

v = √(9.8 * 36 * 1.376)

v = √(352.48)

v = 18.8 m/s

Therefore, the car can take this curve at a speed of 18.8 m/s without skidding to the outside of the curve.

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To find out how long it takes for the equipment to reach the lighthouse top, we can use the work-energy principle which states that the work done on an object is equal to the change in its kinetic energy. Since the velocity is constant, the change in kinetic energy is zero.

Therefore, the work done on the object is equal to the force required to lift it multiplied by the distance it is lifted. We can use the formula:

Work = force x distance

We know that the work done is equal to the power multiplied by the time, so we can use this formula as well:

Work = Power x time

We can use these two formulas to find the time it takes to raise the equipment to the lighthouse top:

force = mg = (14.0 kg)(9.8 m/s^2) = 137.2 N

distance = 106 m

Work = force x distance = 137.2 N x 106 m = 14,532.8 J

Power = 3.00 x 10^2 W

We can now substitute these values into the second formula:

Work = Power x time

14,532.8 J = 3.00 x 10^2 W x time

time = Work / Power = (14,532.8 J) / (3.00 x 10^2 W) = 484.4 seconds

So, it takes the equipment approximately 484.4 seconds (8 minutes and 4.4 seconds) to reach the lighthouse top.

I hope this helps :)

Answer:

[tex]250\; {\rm N}[/tex], assuming that the sand exerts a constant force.

Explanation:

If the sand exerts a constant force, acceleration (deceleration) would be constant. Let [tex]a[/tex] denote this acceleration.

It is given that:

Additionally, final velocity is [tex]v = 0\; {\rm m\cdot s^{-1}}[/tex] when the object is at rest.

Rearrange the SUVAT equation [tex]v^{2} - u^{2} = 2\, a\, x[/tex] to find acceleration [tex]a[/tex]:

[tex]\begin{aligned}a &= \frac{v^{2} - u^{2}}{2\, x} \\ &= \frac{{(0\; {\rm m\cdot s^{-1}})}^{2} - {(100\; {\rm m\cdot s^{-1}})}^{2}}{2\, (0.4\; {\rm m})} \\ &= (-12500)\; {\rm m\cdot s^{-2}}\end{aligned}[/tex].

Multiply acceleration by mass to find the net force:

[tex]\begin{aligned}(\text{net force}) &= m\, a \\ &= (0.02\; {\rm kg})\, (-12500\; {\rm m\cdot s^{-2}}) \\ &= (-250)\; {\rm {N}}\end{aligned}[/tex].

(Negative since velocity is decreasing.)

Assuming that all other forces are negligible. The force that the sand exerted would be equal to the net force, [tex](-250)\; {\rm N}[/tex] (negative since this force opposes the motion.)

Answer:

Explanation:

In order to determine how far you will have gone after 1.00 min, we need to calculate the distance traveled while coasting down the hill and the distance traveled while pedaling.

To calculate the distance traveled while coasting down the hill, we can use the equation:

distance = initial velocity * time + (1/2) * acceleration * time^2

Since you start at the top of the hill with an initial velocity of 0 m/s, and we know that the acceleration is 2.00 m/s^2, and time is unknown. we can solve for time using the final velocity equation:

velocity = acceleration * time + initial velocity

18 = 2*t + 0

t = 9 sec

Now we have time and acceleration, we can calculate distance.

distance = 0 * 9 + (1/2) * 2 * 9^2

distance = 81 m

Now we know how far you have traveled while coasting down the hill, we can calculate the distance traveled while pedaling.

We know that you are pedaling to maintain a constant speed of 18.0 m/s for 1.00 min, so we can use the formula:

distance = speed * time

distance = 18 * 1*60 = 1080 m

Therefore, in total, you have traveled 1080 + 81 = 1161 m from the time you left the hilltop.

About the possibility of a collision between this asteroid and the Earth the true statement is there is not enough information to determine whether there is danger of a collision.

What is asteroid?

A tiny, stony object called an asteroid orbits the Sun. They are made up of materials left over from the formation of the solar system and are typically found in the asteroid belt. Most asteroids are less than one kilometer in diameter, but some can be much larger. Asteroids are commonly composed of minerals and metals, such as iron, magnesium, and silicon. Asteroids are classified into three main types: C-type, S-type, and M-type. C-type asteroids are the most common and make up around 75% of known asteroids. They are made up of dark, carbon-rich material and are often referred to as "carbonaceous chondrites". S-type asteroids are made up of silicate material, such as clay and silica, and are typically brighter than C-type asteroids. M-type asteroids are made of metallic material, such as iron and nickel, and are the least common type.

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Dams on rivers are thicker at the bottom than the top because the majority of the force exerted on the dam is from the weight of the water pushing down on it. The water exerts more pressure on the lower part of the dam than the upper part, so the bottom of the dam must be stronger and thicker to withstand this pressure. Additionally, the bottom of the dam is also more susceptible to erosion from the water flow, so it also needs to be thicker to resist erosion. The thicker bottom also helps to counterbalance the hydrostatic pressure and provide stability to the dam.

Dams on the rivers are thicker at the bottom than that of the top because of the pressure which is exerted by liquids increases with depth. The walls are made thicker at the bottom, so that they can handle the pressure exerted by water.

A dam is a barrier which stops or restricts the flow of surface water or underground streams on the planet. Reservoirs are created by dams not only to suppress floods but also to provide water for activities such as irrigation, human consumption, industrial use, aquaculture, and for the navigability.

Dams made on the rivers are generally thicker at the bottom than at the top because the pressure at a point inside a liquid depends on the depth from the free surface, therefore, the pressure is very high at the bottom of the dam. To tolerate this pressure, the walls of a dam are made thicker  at the bottom. As we move upwards in the river, the pressure goes on decreasing, so the thickness of wall is made smaller and smaller. That is why, the walls of a dam are made thinner at the bottom .

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Answer:

Explanation:

1. Place a cup of hot tea on a flat surface.

2. Place a thermometer in the tea and record the temperature.

3. Place a fan in front of the cup of tea and turn it on.

4. Place the thermometer in the tea again and record the temperature.

5. Compare the two temperatures and observe the difference.

6. The difference in temperature is an indication of the thermal energy that has been dissipated from the cup of hot tea.

Answer:

The unconditioned stimulus (UCS) in this illustration of classical conditioning is a bee sting. The child's discomfort and startle response are examples of the unconditioned response (UCR).

The Sprite drink is the conditioned stimulus (CS). The Sprite soda did not initially elicit any specific reactions (it was neutral). However, since the child had a bee sting while drinking soda, the discomfort and bee sting are now connected to the beverage, specifically Sprite.

The child's fear of the Sprite soda is the conditioned reaction (CR). The child now has anxiety whenever he sees or consumes sprite soda as a result of the link between the bee sting and the soda.

Explanation:

see above

Lets ignore the length of the airplane as well as any space for safety.

According to question we have to find minimum length of runway needed to accommodate airplanes that accelerate uniformly at 2.7m/s and must reach a ground velocity of 64m/s before they can take off,

since [tex]v^{2}[/tex] = [tex]u^{2}[/tex] + 2as

s = [tex]\frac{v^{2} - u^{2} }{2a}[/tex]

s = [tex]\frac{64^{2} - 0^{2} }{2 X 2.7}[/tex]

s = [tex]\frac{4096}{5.4}[/tex]

s = 758.51

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Answer:

Relative permittivity describes the ability to polarize a material subjected to an electrical field.

Explanation:

This polarization originates from a number of sources:

- electron cloud displaced relative to nucleus

- relative displacement of charged ions

- alignment of dipoles in electric field

- movement of charge carriers trapped by interfaces in heterogeneous systems

- movement of ionic charges

In simple terms, relative permittivity tells us how well a material can hold an electric charge. A material with a high relative permittivity can hold more electric charge than a material with a low relative permittivity.