what causes the apparent motions of stars across the sky each night
A. earth revolves around the sun.
B. earth spins on its axis
C. the stars move around the sun and earth.
B. the sun and earth revolve around the stars

Answer:

From first equation of motion:

\({ \rm{v = u + at}} \\ { \rm{18 = 0 + (a \times 15)}} \\ { \rm{18 = 15a}} \\ \\ { \boxed{ \rm{ \: a = \frac{18}{15} \: m {s}^{ - 2} }}}\)

For the second case:

\({ \rm{v = u + at}} \\ { \rm{v = 0 + ( \frac{18}{15} \times 10)}} \\ \\ { \rm{v = 12 \: {ms}^{ - 1} }}\)

The average braking force acting on the car is -690N, So The correct option is b.)

To solve this problem, we can use the following formula:

\(d = (v_f^2 - v_i^2) / (2a)\)

where d is the distance traveled, v_f is the final velocity (0 m/s, since the car comes to a complete stop), v_i is the initial velocity (27 m/s), and a is the average braking acceleration.

We can rearrange this formula to solve for the braking acceleration:

\(a = (v_f^2 - v_i^2) / (2d)\)

Substituting the given values, we get:

\(a = (0^2 - 27^2) / (2 * 578.0) = -6.24 m/s^2\)

The negative sign indicates that the acceleration is in the opposite direction to the car's motion, i.e. it is a deceleration.

Finally, we can use Newton's second law (F = ma) to find the average braking force:

F = ma = (1100 kg)(-6.24 m/s²) = -6854.4 N

Rounding to the nearest 10 N, we get:

F ≈ -690 N

To know more about braking force refer here

https://brainly.com/question/28966720#

#SPJ11

This principle is based on the observation that in undisturbed sedimentary rock formations, the oldest layers are at the bottom and the youngest layers are at the top.

What is Fossils Fuels?

Fossil fuels are a group of non-renewable energy sources that are formed from the remains of dead plants and animals that lived millions of years ago. Fossil fuels include coal, oil, and natural gas, and are used to generate electricity, power transportation, and heat buildings.

Coal is formed from the remains of plants that lived in swampy environments millions of years ago. Over time, these plants were buried and subjected to high pressure and temperature, which converted them into coal. Coal is primarily used to generate electricity in power plants.

The law of superposition is a basic principle of geology that states that in a sequence of sedimentary rock layers, each layer is younger than the one beneath it and older than the one above it.

Learn more about Fossils Fuels from the given link

https://brainly.com/question/79954

#SPJ1

Answer:

can u write in eng I didn't recognize your language...

Answer:

Plants need light for the process of photosynthesis. Without photosynthesis, plants cannot make their own food.

Chlorophyll a primarily absorbs light in the blue and red regions of the visible spectrum.

Chlorophyll a has its highest absorption peaks in the blue-violet range at around 430-450 nm and in the red range at around 640-680 nm. These wavelengths correspond to the energy levels that chlorophyll a can effectively capture for photosynthesis. The absorption of light in these specific ranges allows chlorophyll a to maximize its energy absorption and drive the photosynthetic process. The absorption of blue and red light by chlorophyll a leaves the green wavelengths relatively unabsorbed, which is why plants containing chlorophyll a appear green to our eyes. This selective absorption of light by chlorophyll a is vital for efficient energy conversion in photosynthetic organisms.

To know more about Chlorophyll a, visit:

https://brainly.com/question/31951083

#SPJ11

The second polarizer's axis is positioned at a 90-degree angle, and the light intensity that passes through it is 0.

The incident light is ordinary light. it is unpolarised

I₁=I₀/2  For the first polarized

I₂=I₁cos²θ          (Second polarization)

 =I₀/2 cos²90°             (θ=90)

 =I₀/2(0)²

 =0

When an area is measured on a plane perpendicular to the direction of energy propagation, it is possible to define the intensity or flux of radiant energy as the power transferred per unit area. Watts per square meter (W/m2) and kg/s3 are the basic units for this system in the SI. The term "intensity" is most usually used to describe electromagnetic or acoustic waves, such as light or radio waves, where the average power transfer over the course of one wave period is taken into account. Any situation where energy is exchanged can be described as having intensity. The amount of kinetic energy that water drops from a garden sprinkler are carrying, for instance, might be calculated.

Learn more about intensity here:

https://brainly.com/question/17583145

#SPJ4

The Mid-Atlantic Ridge spreads about 2-5 centimeters per year whereas the East Pacific Rise spreads about 6-16 centimeters every year.

According to the research, the East Pacific Rise is spreading faster than the Mid-Atlantic Ridge. The wide of red and orange parallel to the East Pacific Rise indicates that a large area of oceanic rocks is new and young. The Mid-Atlantic Ridge is a slow-spreading center. It spreads 2-5 centimeters every year and forms an ocean trench while on the other hand, the East Pacific Rise spreads faster because the East Pacific Rise spreads about 6-16 centimeters every year which is higher than the Mid-Atlantic Ridge.

So we can conclude that the East Pacific Rise is spreading faster as compared to the Mid-Atlantic Ridge.

Learn more about floor spreading here: https://brainly.com/question/870586

#SPJ1

Answer:

The block that is dropped straight down will have the greatest speed before hitting the ground. This is because it has no initial horizontal velocity, so all of its potential energy is converted into kinetic energy as it falls. The other blocks have some initial horizontal velocity, so some of their potential energy is converted into kinetic energy in the horizontal direction. This means that they will have a lower speed when they hit the ground.

Explanation:

The potential energy of an object is given by the equation:

PE = mgh

KE = 1/2 mv^2

When an object is dropped, its potential energy is converted into kinetic energy. The equation for the conservation of energy can be used to express this relationship:

PE = KE

mgh = 1/2 mv^2

v^2 = 2gh

v = sqrt(2gh)

The velocity of an object that is dropped is directly proportional to the square root of the height from which it is dropped.

The blocks in the question are all dropped from the same height. However, the block that is dropped straight down has no initial horizontal velocity. The other blocks have some initial horizontal velocity. This means that the block that is dropped straight down will have a greater speed when it hits the ground than the other blocks.

Learn more about Projectile Motion.

https://brainly.com/question/32657362

#SPJ11

The horizontal range of the projectile is 91.7 meters in the given case.

The horizontal range of a projectile can be found using the formula:

A projectile is any object that is thrown, launched, or otherwise propelled through the air and subject to the force of gravity. Examples of projectiles include a baseball being thrown by a pitcher, a rocket being launched into space, or a cannonball fired from a cannon.

\(R = (v0^2/g) * sin(2θ)\)

where R is the horizontal range, v0 is the initial speed, θ is the launch angle, and g is the acceleration due to gravity (9.81 m/s^2).

Plugging in the given values, we get:

\(R = (30^2/9.81) * sin(2*60)\\R = (900/9.81) * sin(120)\\R = 91.7 meters\)

To know more about initial speed   here

https://brainly.com/question/24493758

#SPJ4

The nuisance doctrine is a legal principle that says someone who moves into a place knowing there is a nuisance there cannot later complain about the nuisance and demand compensation for it.

When a homeowner lives close to an airport, it is widely accepted that homeowner should have been aware of the potential noise and other disruptions connected with living close to an airport if the airport was already operational when the homeowner moved in. Such circumstances may make it more difficult for a homeowner to successfully file a claim for compensation based on noise pollution or other airport-related problems.

A stronger case might be made for compensation based on increased noise pollution and other negative effects caused by the airport if a homeowner moved into the neighbourhood before the airport was established and had no knowledge of or reasonable expectation of its construction. This is due to the fact that instead of "coming to the nuisance," they encountered a change in their surroundings after already settling down.

Read more about nuisance doctrine on:

https://brainly.com/question/28658691

#SPJ4

The Force need to accelerate the object is by 3 m/s² is 15 N.  Suppose a friction force of 5 N acts on the motion of the object, the force needed to be applied to the object is 20 N

This can be defined as the product of the mass and the acceleration of a body. The S.I unit of force is kgm/s or Newton(N)

To calculate the force needed to accelerate a mass of 5 kg object at 3 m/s² we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Suppose a frictional force of 5 N acts on the motion, The force applied is

Where:

Substitute into equation 2

Hence, The Force need to accelerate the object is by 3 m/s² is 15 N. Suppose a friction force of 5 N acts on the motion of the object, the force needed to be applied to the object is 20 N

Learn more about force here: https://brainly.com/question/12970081

In response to the question about a student claiming that using a space heater and hairdryer at the same time causes the power for the entire house to go out, it is unlikely that the power for the entire house would be affected. This can be explained using knowledge of circuitry and electricity.

Firstly, the electrical system in a house is designed with multiple circuits. Each circuit is protected by a circuit breaker, which is a safety device designed to prevent electrical overloads and short circuits. When a circuit is overloaded or a short circuit occurs, the circuit breaker trips, cutting off power to that specific circuit only, not the entire house.

In this scenario, the space heater and hairdryer are likely drawing a large amount of current due to their high power consumption. If both appliances are connected to the same circuit, it is possible that the combined current drawn by the heater and hairdryer exceeds the capacity of the circuit breaker, causing it to trip and cut off power to that specific circuit.

However, the power for the entire house should not go out, as the other circuits in the house would remain unaffected. The second student's claim that the use of the space heater and hairdryer cannot affect the power to the entire house is more accurate, given that only the circuit containing these appliances would be impacted.

In conclusion, it is unlikely that using a space heater and hairdryer simultaneously would cause the power for the entire house to go out, as circuit breakers are designed to protect specific circuits from overload and not the whole electrical system.

To know more about claiming refer here

https://brainly.com/question/14551819#

#SPJ11

Answer:

constant

Explanation:

The total energy of the swinging pendulum remains constant at all points. This is due to the conservation of energy principle, which states that energy cannot be created or destroyed, but only transferred or transformed from one form to another. In the case of a swinging pendulum, potential energy is converted to kinetic energy as the pendulum swings back and forth, and then back to potential energy as it reaches its highest point on either side. The total energy (the sum of potential and kinetic energy) remains constant throughout the pendulum's motion.

Answer:

The magnification of the spoon is approximately 0.39

Explanation:

To determine the magnification of the spoon, we can use the lens formula:

1/f = 1/v - 1/u

Where:

f = focal length of the lens (convex lens in this case)

v = image distance from the lens

u = object distance from the lens

Given:

f = -6.50 cm (negative because it is convex)

u = 5.00 cm

Substituting the given values into the lens formula:

1/-6.50 = 1/v - 1/5.00

Simplifying:

-1/6.50 = 1/v - 1/5.00

To solve for v, we need to find a common denominator:

-5/32.50 = (5 - 6.50)/ (5v)

-5/32.50 = (-1.50)/ (5v)

Cross-multiplying:

-5 * 5v = -32.50 * -1.50

-25v = 48.75

Dividing both sides by -25:

v = 48.75 / -25

v = -1.95 cm

Now, we have the image distance (v), which is approximately -1.95 cm. To find the magnification (M), we use the formula:

M = -v/u

Substituting the values:

M = -(-1.95 cm) / 5.00 cm

M = 0.39

Answer:

C

Explanation:

1) Frequency

2) I dont know this one sorry

There are no immediate substitutes for gasoline as public transportation is often limited and walking, biking, or taking a cab is not always feasible. Therefore, people may continue to purchase gasoline despite an increase in price.

One item that is common in our society that I believe is elastic is fast food. Elasticity is the degree to which changes in price affect demand for a good or service.

Fast food is elastic because it has many substitutes such as restaurants, home-cooked meals, and even other fast-food chains. Fast food is also highly responsive to price changes, which means that a small change in price can cause a large change in demand.

For example, a $1 price increase for a burger meal at a fast-food chain might cause many people to switch to a competitor with a cheaper price. Thus, fast food is an elastic product in our society.One item that is common in our society that I believe is inelastic is gasoline.

Gasoline is an inelastic product because it has few substitutes and people need it for transportation. If the price of gasoline increases, people may continue to purchase it even if it means spending more money because there are few alternative options.

Additionally, there are no immediate substitutes for gasoline as public transportation is often limited and walking, biking, or taking a cab is not always feasible.

Therefore, people may continue to purchase gasoline despite an increase in price.

For example, if the price of gasoline increases by $1, a consumer will still purchase gasoline because they require it to get to work or school. Thus, gasoline is an inelastic product in our society.

to learn more about feasible.

https://brainly.com/question/33507886

#SPJ11

One item in our society that I believe is elastic is the price of gasoline  because of  various alternatives to gasoline and the proportion of income spent. An item in our society that I believe is inelastic is medical treatment because of the necessity of medical treatment and lack of substitutes.

Firstly, the availability of substitutes contributes to the elasticity of gasoline. In our society, there are various alternatives to gasoline, such as electric vehicles or public transportation. When the price of gasoline increases, consumers have the option to switch to these substitutes, reducing their demand for gasoline. Conversely, when the price of gasoline decreases, consumers may choose to drive more or purchase larger vehicles, increasing their demand for gasoline. This flexibility in consumer choices demonstrates the elasticity of gasoline.

Secondly, the proportion of income spent on the product also influences the elasticity of gasoline. For many individuals, the cost of gasoline represents a significant portion of their overall budget. When the price of gasoline rises, consumers may have to make adjustments to their spending habits or seek alternative means of transportation to cope with the higher expenses. Conversely, when the price of gasoline decreases, consumers may have more disposable income to spend on other goods and services. This sensitivity to price changes further supports the elasticity of gasoline.

On the other hand, an item in our society that I believe is inelastic is medical treatment. Two determinants of elasticity that contribute to this belief are the necessity of the product and the lack of substitutes.

Firstly, the necessity of medical treatment makes it an inelastic product. When individuals require medical treatment, they often have no choice but to seek the necessary healthcare services regardless of the price. This is especially true for life-saving procedures or medications. The demand for medical treatment is driven by the urgency and importance of preserving one's health, which leads to a less responsive consumer behavior to price changes.

Secondly, the lack of substitutes also contributes to the inelasticity of medical treatment. In many cases, there are limited alternatives or substitutes available for specific medical treatments. For example, if a person requires a specific surgery or medication to treat a condition, they cannot easily switch to a different treatment option to lower their expenses. The lack of viable substitutes reduces consumer choice and makes the demand for medical treatment less responsive to changes in price.

In summary, the price of gasoline is elastic due to the availability of substitutes and the proportion of income spent on the product. On the other hand, medical treatment is inelastic due to its necessity and the lack of substitutes. These determinants of elasticity highlight the different levels of responsiveness to price changes in these two common items in our society.

Learn more about gasoline from the link:

https://brainly.com/question/29186659

#SPJ11

To convert a single-linked list into a vector, you would need to iterate through each element of the linked list and append it to the vector. This can be done by creating a new vector and a temporary pointer variable that points to the head of the linked list. Then, while the pointer is not NULL, you can use the push_back() function to add each element to the vector. Once all elements have been added, the vector will contain the same elements as the linked list in the same order.

To convert a single-linked list into a vector, follow these steps:

1. Initialize an empty vector to store the values from the single-linked list.
2. Iterate through the single-linked list using a pointer or iterator.
3. For each element in the single-linked list, add (push_back) its value to the vector.
4. Continue iterating until you reach the end of the single-linked list.
5. Return the vector containing the values from the single-linked list.

By following these steps, you will successfully convert a single-linked list into a vector.

Learn more about :

single-linked list : brainly.com/question/29360466

#SPJ11

Answer: 1102.5 meters

Explanation:

Using the concepts of motion, we got that  is the acceleration of gravity on planet x in which  a 5.0 * 10^1 kg barbell can be lifted by exerting a force of only 180N.Minimal force needed in earth is   N.

We know very well that rate of change of momentum in per unit time is equal to the Force according to newton second law.

It means

F=dp/dt or in other words,we know that this F=ma

where m is the mass of the body and a is the acceleration.

So, in planet X, we are given that applied force is 180N and mass of the object is 50 kg

So applying the formula

=>F=ma

=>180=50×a

=>a=50/180

=>a=0.277m/s²

Now, the minimum force needed to lift the same object in earth is given by the same formula

=>F=ma but here a is gravity whose value is equal to 9.8

=>F=50×9.8

=>F=490N

Hence, on planet x, a 5.0 * 10^1 kg barbell can be lifted by exerting a force of only 180 n, the acceleration of gravity on planet x is 0.277m/s² and if the same barbell is lifted on earth, minimal force is needed is 490N.

To know more about motion, visit here:

https://brainly.com/question/22810476

#SPJ4

Answer:  

C. Software Engineer

This is due to the fact that occluded fronts combine two cold air masses, which causes one of the cold air masses to go downward.

When a warm air mass is sandwiched between two cold air masses, an occluded front occurs. In an occlusion, the warm front passes over the cold front, which dives beneath it.

In a front is obscured, the warm front is fully supplanted by the cold front, in which the warm air masses have completely disappeared. Furthermore, there are frequent shifts in the various weather producing circumstances because of the cold front's relatively low temperature.

Learn more about occluded fronts, here:

https://brainly.com/question/11718564

#SPJ4

Ideally in no air resistance, the ball will return to the thrower's hand with a speed of 10 m/s. Thus, the correct option is B.

Speed is the distance covered by an object with respect to time taken. It can also be defined as the change in the position of an object with respect to time. It is a scalar quantity as it has only magnitude and no direction.

The ball which is thrown straight upward in the sky with a speed of 10 m/s will return back to the thrower's hands with a speed of 10m/s in the ideal case of no air resistance because during this situation, no acceleration takes place. At the highest point, the velocity of the ball is zero however the ball is still under the influence of gravity, here the acceleration due to gravity is acting downwards on the ball.

Learn more about Speed here:

https://brainly.com/question/28224010

#SPJ2

In the described heat engine, the working fluid is steam. Steam is produced by heating water in the boiler using the heat generated by the nuclear reactor.

The high-pressure steam then turns the turbine, producing mechanical work, which is then converted into electrical energy. As the steam expands and loses its energy, it is condensed into water by rejecting heat to the atmosphere in the condenser.

This water is then pumped back into the boiler to be heated again and converted into steam, thus completing the cycle. Steam is an excellent working fluid for this type of heat engine because it has a high heat capacity, which means that it can store a lot of heat energy per unit mass.

Additionally, it undergoes a phase change when it is heated, which allows it to expand and produce mechanical work when it is under pressure. Finally, steam is readily available and relatively cheap to produce, making it an ideal choice for powering large-scale steam power plants.

Learn more about nuclear here:

https://brainly.com/question/13090058

#SPJ4

Complete question is:

A nuclear reactor is used to provide heat to a steam power plant. Within the heat engine, steam is generated in the boiler, the steam turns a turbine to produce power, and the steam is condensed by rejecting heat to the atmosphere before being pumped to the boiler again. Which substance is considered the working fluid in this heat engine? The water going through the boiler, turbine, and condenser

Answer:

t = 2.38 s      to buying a new phone

Explanation:

Displacement =  1/2 a t^2

  27.67 = 1/2 ( 9.81) t^2

t = 2.38 s

The change in the energy of the water in the process is 52Btu, when 65 btu of heat is transferred to the water and heat losses from side walls.

To know more about energy visit:

https://brainly.com/question/1932868

#SPJ9