The sun's rays strike Earth's surface most directly at the poles. Near the Equator the sun's rays strike the surface less directly. True or False

Answers

Answer 1

your answer is false.

Answer 2

True. You can get nearly constant daylight during the summer, at the poles.

Related Questions

If planet i is 30.3 million miles farther from the sun than planet ii, then planet iii is 24.6 million miles farther from the sun than planet i. when the total of the distances for these three planets from the sun is 196.2 million miles, how far away from the sun is planet ii?

Answers

Since the total distance for all three of the planets is 196.2 million miles, you would add planet i and planet iii, then subtract that number from 196.2

planet i and planet iii equaled 54.9 million miles, that subtracted from 196.2 equals 141.3

So your answer is 141.3 million miles

How much time does it take a power drill accelerating at 64.3 rad/s2 to achieve 1500. rotations per minute(RPM)?

Answers

First of all, we need to convert the final angular velocity from rpm (revolutions per minute) to rad/s. Keeping in mind that
[tex]1 rev = 2\pi rad[/tex]
[tex]1 min = 60 s[/tex]
We have
[tex]\omega _f = 1500 \frac{rev}{min} \cdot \frac{2 \pi rad/rev}{60 s/m}=0.157 rad/s [/tex]

the angular acceleration is given by
[tex]\alpha = \frac{\omega _f - \omega _i}{\Delta t} [/tex]
where [tex]\omega _i[/tex] is the initial velocity (in this case, zero), and [tex]\Delta t[/tex] is the time needed to accelerate the drill to its final velocity. Using [tex]\alpha = 64.3 rad/s^2[/tex], we can calculate [tex]\Delta t[/tex]:
[tex]\Delta t = \frac{\omega _f}{\alpha}= \frac{0.157 rad/s}{64.3 rad/s^2}=2.44 s [/tex]

Which are states of matter? Check all that apply.
energy
gas
liquid
ion
plasma
solid

Answers

gas liquid plasma solid

Liquid, gas, solid and plasma are States of matter.

What is matter?

Matter is anything that have mass and occupied space usually getting it's mass from energy.

There are states of matter and they are;

Solid

Liquid

Gas

Plasma

A state of matter can be termed a physical property if it dies not change the chemical composition of the substance and is reversible.

A state of matter can be called chemical property if the chemical composition is change and it is irreversible.

For example water exist in three state of matter.

It is solid if it is ice, it is liquid if it is water and it is gaseous if it is water vapor.

Therefore, Liquid, gas, solid and plasma are States of matter.

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Which ions are most abundant in a base?

Answers

The most abundant cation (or positively charged ion) in the extracellular fluid (ECF) is sodium (Na+). The most abundant anion (or negatively charged ion) in the ECF is chloride (Cl-). The most abundant cation in the intracellular fluid (ICF) is potassium (K+).

The hydroxide ions is the most abundant in a base. A base is regarded as a

substance which reacts with an acid to form a salt.

The base has a characteristic feature of having a pH between 7.1 to 14.0.

Strong bases have a pH of about 12-14 while weak bases have a pH of

between 7.1-9.

Bases have hydroxide ions which is responsible for the basic nature of the

substance while an acid has abundant hydrogen ions which is responsible

for its acidic nature.

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If a car increases its speed from 20 mph to 60 mph, by what factor does the kinetic energy of the car increase

Answers

If a car increases its speed from 20 mph to 60 mph, then the kinetic energy of the car increases by a factor of 9.

What is Kinetic energy?

Kinetic energy is the energy which is present in the object which is under motion. Kinetic energy is a vector quantity due to the presence of both the magnitude and direction. The SI unit of kinetic energy is Joule.

KE = 1/2 × m × v²

where, KE = Kinetic energy,

m = mass of the object,

v = velocity of the object

KE₁ = 1/2m(20)²

KE₂ = 1/2m(60)²

Therefore, the factor by which the kinetic energy of the car can be increased can be calculated by taking ratio of the kinetic energy:

KE₁/ KE₂ = 1/2m(20)² / 1/2m(60)²

KE₁/ KE₂ = 400/ 3600

KE₁/ KE₂ = 1/9

Therefore, the factor by which the kinetic energy of car has been increased by 9.

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Which type of foot PPE must you wear if electrical shock is ever a possibility with your job?

Answers

The appropriate PPE(personal protective equipment) to be worn for foot protection against electric shock is boots retrofitted with rubber soles. Rubber does not conduct electricity and so will safeguard against electric shocks.

Other personal protective equipment used in a lab or industry can include safety glasses, rubber gloves, protective clothing and masks and respirators. PPE goes hand in hand with personal behaviour, personal grooming and housekeeping.

Match the situation with the energy transformation ITEMBANK: Move to Top A boy shooting a rubber band across the classroom A child going down a slide on a playground Rubbing your hands together to warm them on a cold day Turning on a battery operated light Using a dc electric motor Using a gas power heater to warm a room Using a hand crank generator to produce electric current Using the light in your room that is plugged into the wall Chemical potential energy transformed into radiant energy Gravitational potential energy transformed into kinetic energy Elastic potential energy transformed into kinetic energy Chemical potential energy transformed into thermal energy Electrical energy transformed into radiant energy Kinetic energy being transformed into thermal energy Electrical energy transformed into kinetic energy

Answers

A boy shooting a rubber band across the classroom -->
Elastic potential energy transformed into kinetic energy
The initial energy is the energy stored in the muscles of the boy's arm, which is elastic potential energy. This is converted into motion of the rubber, therefore kinetic energy

A child going down a slide on a playground --> Gravitational potential energy transformed into kinetic energy
On top of the slide, all the energy of the child is gravitational potential energy due to its height with respect to the ground (E=mgh). when it moves down the slide, this is converted into kinetic energy, because the child acquires a speed v (E=1/2 mv^2)

Rubbing your hands together to warm them on a cold day --> Kinetic energy being transformed into thermal energy
When rubbing hands, we are moving them (kinetic energy), and this energy raises the temperature of the hand's surface (thermal energy)

Turning on a battery operated light -->
Chemical potential energy transformed into radiant energy
A battery works by mean of chemical reactions (chemical potential energy), producing light (so, emitting energy by radiation, i.e. radiant energy)

Using a dc electric motor --> Electrical energy transformed into kinetic energy
A dc electric motor works using currents (so, electrical energy), and the energy produced can be used for example to accelerate a car (kinetic energy)

Using a gas power heater to warm a room --> Chemical potential energy transformed into thermal energy
A gas power heater burns gases (so, chemical reaction, i.e. chemical potential energy) to raise the temperature of the room (thermal energy)

Using a hand crank generator to produce electric current --> Kinetic energy transformed into electrical energy
In a hand-crank generator, the handle is being rotated (kinetic energy) in order to produce an electric current (electrical energy)

Using the light in your room that is plugged into the wall --> Electrical energy transformed into radiant energy
The lamp works by using electrical current flowing into a resistor (electrical energy) and it produces light, so it emits energy by electromagnetic radiation (radiant energy)

What can cause the sea level to fall? ocean basins getting smaller or water being removed from the hydrological cycle ocean basins getting larger or water being removed from the hydrological cycle ocean basins getting larger or water returning to the hydrological cycle ocean basins getting smaller or water returning to the hydrological cycle

Answers

The correct answer is
a) ocean basins getting smaller or water being removed from the hydrological cycle.
When ocean basins get smaller, there is less water in the oceans, and so the sea level falls down. Similarly, if water is removed from the hydrological cycle, there is less water going back to the oceans via precipitations (or coming from the land), therefore the sea level decreases.

ANSWER
ocean basins getting smaller or water being removed from the hydrological cycle

12) Photosynthesis is a chemical reaction where carbon dioxide and water react to form glucose (C6H12O6) and oxygen gas. Which represents the proper balanced equations for photosynthesis?

Answers

Answer : The balanced chemical reaction will be,

[tex]6CO_2+6H_2O\overset{sunlight}\rightarrow C_6H_{12}O_6+6O_2[/tex]

Explanation:

Photosynthesis : It is a type of chemical reaction that occurs in the green plants or living organism.

During the photosynthesis process, the carbon dioxide reacts with water in the presence of sunlight to produce glucose and oxygen as a product.

The balanced chemical reaction will be,

[tex]6CO_2+6H_2O\overset{sunlight}\rightarrow C_6H_{12}O_6+6O_2[/tex]

In the photosynthesis reaction, carbon dioxide and water molecule are the reactants and glucose and oxygen are the products.

What is the most power in watts the ear can receive before the listener feels pain?

Answers

Final answer:

The human ear starts to feel pain at sound intensities of 1 W/m². There is a broad range of sound intensities that can be heard without pain, but anything at or above the pain threshold may cause immediate hearing damage.

Explanation:

The amount of power in watts that the ear can receive before a listener feels pain is at an intensity of 1 W/m². The human ear is very sensitive and can detect sounds with a minimum threshold of 10−12 W/m² (0 dB). However, exposure to intensities at or above 1 W/m² can be painful. For example, sounds that are much higher in intensity than this level can be unbearable and potentially harmful, potentially leading to immediate damage. It is essential to protect one's hearing with measures such as using earplugs or ear muffs, especially when exposed to sounds of high decibel levels.

The atmospheric temperature decreases when snow starts melting because the snow------------------------- from the atmosphere to melt.
A. releases thermal energy
B. absorbs thermal energy
C. releases temperature
D. absorbs temperature

Answers

It absorbs thermal energy therefore melting the snow

B because you know snow is cold but when our atmosphere gets hotter the snow absorbs the heat which causes it to melt

if a toaster produces 8 ohms of resistance in a 120 v circuit, what is the amount of current in the circuit

Answers

voltage (v) = current (i) × resistance (r)
i = v/r = 120/4 = 30 amps

You have an electromagnet that is not quite strong enough. What are three changed you could make to increase the strength

Answers

... wind more turns of wire around the core;

... run more electric current through the wire (use a battery or power supply with more voltage)

... whatever is in the core of the electromagnet, replace it with something that's closer to pure iron.

When vehicles meet on a steep, narrow road, not wide enough for two vehicles, which vehicle must yield the right-of-way?
A. The vehicle going uphill
B. The vehicle going downhill
C. The vehicle going slower

Answers

When vehicles meet on a steep, narrow road which isnot wide enough for two vehicles, the vehicle going downhill must yield the right-of-way by backing up to a wider place or by stopping to leave sufficient space for the vehicle going uphill, except where it is more practical for the vehicle going uphill

Answer: B. The vehicle going downhill

Explanation: The vehicle going huphill needs more force to move, while the vehicle moving downhill actually can be moved only by the gravity acceleration.

So when both cars meet, if the car going uphill loses momentum, the vehicle may not be capable to keep moving uphill after that, so is better that the car going downhill yields the right-of-way to the other car, that needs to preserve the momentum.

Which of the following processes add methane (CH4) to the atmosphere?
A.Breakdown of plant and animal remains in the soil.
B. Leakage from natural gas pipelines.
C. Food digestion by land animals.
D.All of the above.

Answers

Answer: D.All of the above.

Methane is a colourless odourless gas that develops abundantly in nature.

A.Breakdown of plant and animal remains in the soil: The plant and animal remains contains large amount of organic matter, which is decomposed by soil bacteria. This process results in formation of methane gas. The process takes place in the absence of oxygen, hence, called as anaerobic decomposition. This gas gets liberated to the external environment.

B. Leakage from natural gas pipelines: The natural gas is obtained as a fossil fuel from deep layers of the earth. This gas is excavated in order to use it as fuel to run vehicles and for cooking food. The gas may liberate to the external environment by leakage.

C. Food digestion by land animals: The land animals such as cow and buffalo discharge dung, which is a rich source of methane. The methane gets liberated from the cow dung to the external environment.

Therefore, all processes are responsible for liberation of methane to the external environment.

All of the above the following processes add methane (CH₄) to the atmosphere.All the options are correct.Hence D is the correct option.

What is methane?

Methane is a colorless, odorless gas that occurs naturally in large quantities.

A.Soil bacteria digest plant and animal remnants: Plant and animal remains include a huge quantity of organic materials, which soil bacteria degrade.

Methane gas is produced as a result of this process. Anaerobic decomposition is a type of breakdown that occurs in the absence of oxygen. This gas is then released into the atmosphere.

B. Natural gas pipeline leakage: Natural gas is a fossil fuel that is extracted from deep layers of the earth.

This gas is mined in order to use it as a source of energy for cars and cooking. Leakage might allow the gas to escape into the environment.

C. Food digestion in land animals: Land animals digest food in a variety of ways.

Hence option D is correct.

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a refrigerator has a power of 90w and is left on for 24 hours. A hair dryer has a power 900w and is on for 20 minutes. which statement correctly compares the energy used by these devices?

Answers

The refrigerator uses 7,776,000 J of energy, while the hair dryer uses 1,080,000 J. The correct comparison is C. the refrigerator uses 6,696,000 J more energy than the hair dryer.

To compare the energy used by the refrigerator and the hair dryer, we need to calculate the energy consumption for each device in joules (J).

Step-by-Step Calculation:

Refrigerator:

Power = 90 W

Time = 24 hours = 24 × 60 × 60 seconds = 86,400 seconds

Energy used = Power × Time = 90 W × 86,400 s = 7,776,000 J

Hair Dryer:

Power = 900 W

Time = 20 minutes = 20 × 60 seconds = 1,200 seconds

Energy used = Power × Time = 900 W × 1,200 s = 1,080,000 J

Now, we compare the two energies:

Energy used by the refrigerator = 7,776,000 J

Energy used by the hair dryer = 1,080,000 J

Difference in Energy Usage:

Difference = 7,776,000 J - 1,080,000 J

Difference = 6,696,000 J

Therefore, the correct statement is:

C. The refrigerator uses 6,696,000 J more than the hair dryer.

complete question:

a refrigerator has a power of 90w and is left on for 24 hours. A hair dryer has a power 900w and is on for 20 minutes. which statement correctly compares the energy used by these devices?

A. The refrigerator uses 1,080,000 J less than the hair dryer.

B. The refrigerator uses 3,224,000 J less than the hair dryer.

C. The refrigerator uses 6,696,000 J more than the hair dryer.

D. The refrigerator uses 7,776,000 J more than the hair dryer.

metabolic processes depend on which factor listed below A.ice B.atospheric nitrogen C.fresh water D.phosphorus

Answers

The answer would be phosphorus

Jodie sets two objects on a flat surface. Object A has a mass of 50g, while object B has a mass of 250g. Jodie pushes both objects with the same force and watches them speed up. Which object will speed up more? A. They speed up the same amount. B. Object B speeds up more. C. Object A speeds up more. D. Neither object speeds up.

Answers

Object A speeds up more

What are two ways you can increase the magnetic field of an electromagnetic?

Answers

1). Wind more turns of wire in the coil around the core.

2). Increase the electrical current flowing in the wire.
(You can do that by using a battery or power supply with a little more voltage.)

3). If the core of the electromagnet is anything else but pure iron,
take it out, throw it away, and replace it with a core of pure iron.

Final answer:

To increase an electromagnet's magnetic field, add more turns to the coil and increase the current flowing through it. Inserting a ferromagnetic core can also enhance magnetic field strength, but limitations exist due to coil resistance and the properties of superconducting materials.

Explanation:

To increase the magnetic field of an electromagnet, you can perform the following modifications:

Increase the number of turns in the coil: Adding more turns to the solenoid will enhance the magnetic field as it is directly proportional to the number of turns in the wire.Increase the current: By increasing the electrical current flowing through the coil, the magnetic field will also increase due to the direct relationship between current and magnetic field strength.

Another method often used to enhance the strength of an electromagnet is by inserting a ferromagnetic material, such as iron, within the coil, which acts as a core to concentrate the magnetic field.

However, it is important to note that there are limits to the strength of the magnetic field that can be created. Exceeding certain thresholds can lead to an overheating problem due to coil resistance, or can destroy the superconducting properties if superconducting materials are used.

What besides mass and gravity , what other factor affects gravitational potential energy?

Answers

The distance or space separating the 2 objects also greatly affects the gravitational potential or force experienced on one object on the other.

This can be seen as per the equation for gravitational forces.

For the lever shown, a = 5 m and b = 2 m. What is the mechanical advantage of the lever?

Answers

mechanical advantage of the lever is 2.5

your answer would be 2.5

a rigid tank of air is cooled (temperature decreased) the volume has to remain constant because it is a rigid tank the air pressure in the rigid tank ___

A. Increases
B. Decreases
C. Stays the same

20 points please help right away

Answers

If we consider Boyles law for gases, it states the following equation,
PV/T =k
where k is a constant
P-pressure, T- temperature and V -volume
the volume is constant at both situations as its a rigid tank as mentioned in the questions.
Therefore we consider Volume to be constant , then equation is
P/T = kV
kV = c (new constant)
P/T = c
P = cT
Therefore pressure is inversely proportional to temperature, whatever change in pressure would cause the same kind of change in temperature as well.
therefore when T decreases, P also decreases.
Answer is B

The air in tires can support a car because gases __________.

Answers

because the air inside the tires is kept at high pressure.

In fact, the force applied by the tires upwards to counter-balance the weight of the car (pushing downwards) is
[tex]F=pA[/tex]
where p is the pressure of the air inside the tires and A is the area of contact between the tire and the car. Therefore, a higher pressure means a larger force F, and eventually if the pressure p is higher enough the force F will be large enough to counterbalance the weight of the car.

Julio hit a baseball. What caused the ball to change direction at the time of impact?
a.the force of gravity
b.the speed of the ball
c.the force of his swing
d.the weight of the air

Answers

The answer is c. the force of his swing

At the time of the impact, there is a collision between two bodies moving in opposite directions.

The force exerted on the ball causes the change of velocity.

Answer: The force of his swing

Explanation: When Julio hit the baseball, the ball changed the direction after the impact. The contact force exerted by the bat on the baseball when it swing caused the change in direction of the ball. The force exerted in time t is causes change in momentum.

the force of gravity acts on the ball all the time. The speed of the ball is not a factor to change direction. The weight of the air exerts a drag on the ball which is also constant. Hence, only the force of swing caused the changed in the direction of the ball.

It takes 5.0 seconds for a wave with a wavelength of 2.5 m to travel past your location. What’s the period of the wave. What is the frequency of the wave and what’s the speed of the wave

Answers

(a) Period of the wave
The period of a wave is the time needed for a complete cycle of the wave to pass through a certain point.
So, if an entire cycle of the wave passes through the given location in 5.0 seconds, this means that the period is equal to 5.0 s: T=5.0 s.

(b) Frequency of the wave
The frequency of a wave is defined as
[tex]f= \frac{1}{T} [/tex]
since in our problem the period is [tex]T=5.0 s[/tex], the frequency is
[tex]f= \frac{1}{5.0 s}=0.2 Hz [/tex]

(c) Speed of the wave
The speed of a wave is given by the following relationship between frequency f and wavelength [tex]\lambda[/tex]:
[tex]v=f \lambda = (0.2 Hz)(2.5 m)=0.5 m/s[/tex]

A blender takes in 180 J of electrical energy. Of the 180 J, 90 J are transformed into kinetic energy, 60 J are transformed into thermal energy, and the rest is transformed into sound.

Answers

Fa sho it's 30j edge said so

Based on the work done by the blender, the efficiency of the blender is 50%.

What is efficiency of a machine?

The efficiency of a machine is a measure of the amount of useful work done by the machine compared to the work input into the machine.

Efficiency = work output/work input × 100%

The useful work on a blender is the motion of the blender which is a form of kinetic energy.

The efficiency of the blender so then be:

work input = 180 J

work output = 90J

Efficiency = 90/180 × 00% = 50 %

Therefore, the efficiency of the blender is 50%.

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Which of these is most likely a step in the formation of soil? a. erosion of soil b. crystallization of rocks c. animals digging rocks d. solidification of organic matter

Answers

The answer is C. animals digging rocks

The change in __________ is the amount of energy in a system that is available to do work.

Answers

The answer is free energy.
In fact, in thermodynamics, the free energy of a system is defined as the energy that can be converted to do work. Helmholtz definition of free energy, for instance, is:
[tex]A=U-TS[/tex]
where U is the internal energy, T the temperature and S is the entropy

Which of the following can influence one???s ability to detect stimuli and increase one???s responsiveness to stimuli in dangerous situations?
A.
stimuli criteria
B.
response criteria
C.
difference threshold
D.
detection threshold

Answer: B response criteria

Answers

The answer is B. Response Criteria
I hope this helps!!

The one that can influence ones ability to detect stimuli and increase responsiveness to stimuli in dangerous situations is response criteria. The correct option is B.

What is stimuli?

Stimulus is defined as any event or change in the external environment that causes a specific functional response in an organ or tissue.

The stimulus can be both internal and external. External stimuli such as sound and touch are detected by sense organs such as the ear and sensory receptors such as those in the skin.

A stimulus is an energy change (e.g., light or sound) that is registered by the senses (e.g., vision, hearing, taste, etc.) and serves as the foundation for perception in perceptual psychology.

A stimulus serves as the foundation for behavior in behavioral psychology (classical and operant conditioning).

Response criteria are those that can influence one's ability to detect stimuli and increase responsiveness to stimuli in dangerous situations.

Thus, the correct option is B.

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how high a hill would a 75 kg hiker has to climb to increase her gravitational potential energy by 10000 j

Answers

Your answer would be 13.6 m

Answer:

[tex]13.60 \ m[/tex]

Explanation:

Given that,

Mass of the hiker is 75 kg

The gravitational potential energy by 10000 J

To solve :

The height of the hill.

Solve :

The gravitational potential energy of object , [tex]G=10000\ J[/tex].

Also, Mass of hiker, [tex]m=75 \ kg.[/tex]

Now,

The relation between Gravitational potential energy (G) and Mass of object (M) is given as:

[tex]G=m\times g \times h.[/tex]

Where , g is acceleration due to gravity, [tex]g=9.8\ m/s^2.[/tex].

Putting , values of G, g and m in above equation.

We get, [tex]10000=75\times 9.8 \times h\\\\h=\dfrac{10000}{75\times 9.8} \ m\\\\h=13.60\ m[/tex]

Hence , this is the required solution.

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