When does an object falling vertically through the air reach terminal velocity?
(1 Point)
A: when the acceleration of the object becomes negative
B: when the acceleration of the object is equal to g
C:when the air resistance equals the weight of the object
D:when the air resistance is greater than the weight of the object
Answer:
a. when the acceleration of the objects become negative
The model shows how solar-powered electric cars indirectly use energy from the Sun. Describe the energy transformations that you see.
Answer:
Radiant energy from the Sun is converted into electrical energy. Electrical energy is then converted into chemical energy. Chemical energy is then converted into electric energy for the motor. The motor converts electrical energy into mechanical energy and makes the car move.
Sun makes radiant energy > converted to electrical energy through solar panels > converted to chemical energy which is then stored in a battery for the motor > converted into mechanical energy to make the car move
Extra:
Look at the image below for a better understanding of the question. I hope this helps! :)
Source:
Edmentum Guided Notes
The energy transformations that can be seen in solar-powered electric cars :
Solar energy > electrical energy > chemical energy > mechanical energy.
What is solar-powered electric cars?
A solar electric car is one that is primarily or entirely powered by solar energy. Solar panels typically feature photovoltaic (PV) cells that convert solar energy directly into electric energy. The phrase "solar vehicle" typically implies that all or some of a vehicle's propulsion is powered by solar energy. Communications, controls, and other auxiliary operations might all be powered by solar energy.
In solar electric car, solar energy converted into electrical energy by photovoltaic (PV) cells. This energy is stored in battery in the form of chemical energy. When the car moves, this chemical energy transforms into mechanical energy.
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A subduction zone is where one plate is pulled under the edge of another and occurs in convergent plate boundaries. Which type of crusts are involved in the subduction zone?
a. continental-continental
b. continental-oceanic
c. oceanic-oceanic
Answer:
b. Continental-oceanic
Explanation:
The Earth's crust has been divided into a series of plates. These plates move at a different rate or speed in different directions.
These plates are divided by the boundary between them which are of three types: convergent, transform and divergent.
The convergent boundaries are the one which moves toward each other and the based on the crust they are of three types: continent-continent, ocean-ocean and ocean-continent.
In ocean-continent boundaries, the oceanic plate is denser compared to the continental plate is lighter as a result of which during the process of subduction the oceanic plate sinks beneath the continental plate towards the mantle and melts.
Thus, Option-B is the correct answer.
When a cricket ball is thrown vertically upwards, it reaches a maximum height of 15 metres. (a) What was the initial speed of the ball ? (b) How much time is taken by the ball to reach the highest point ? (g=10 ms -2
Answer:
The velocity of the cricket ball is 17.32 m/s
Time is taken by the ball to reach the highest point = 0.8660 seconds
Explanation:
The cricket ball can be seen and treated as a projectile in this case
The maximum height attained by a projectile in motion can be calculated using the formula:
[tex]h = \frac{v^2 sin^2 \theta }{2g}[/tex]
In any projectile problem, once we know see that the object was released vertically upwards, we need to know that this means that the angle of projection is 90 degrees, and sin 90 is = 1
hence, h will be modified to become
[tex]h = \frac{v^2 }{2g}[/tex]
[tex]v = \sqrt{2gh}[/tex]
We are given that h = 15m and g = 10m/s2
[tex]v = \sqrt{2 \times 10 \times 15} = 17.32m/s[/tex]
The velocity of the cricket ball is 17.32 m/s
B. We can get the time it took to reach the highest point by dividing
time = distance/speed
Time = 15/17.32 = 0.8660 seconds
Which type of electromagnetic waves would the best to use in an object designed to cook food?
А. gamma waves
B. visible waves
C. infrared waves
D. microwaves
Answer:
C. infrared waves
Explanation:
Microwaves are the electromagnetic waves which would the best to use in an object designed to cook food. Thus, the correct option is D.
What are Microwaves?Microwave is a form of electromagnetic radiation with the wavelengths ranging from about one meter to about one millimeter which is corresponding to the frequencies in the range between 300 MHz and 300 GHz, respectively.
Microwaves are used for cooking food faster than the conventional ovens and would not make a mess in the process. This reheats food instantly quickly. It is helpful for the health conscious people. Microwaves also ensure that a person will never burn the food again. Microwaves are also very economical and energy efficient.
Therefore, the correct option is D.
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if an object with a mass of 248kg is lifted 76 meters in 18 seconds, how much power is used?
Explanation:
power = 1/2 mass × velocity^2 >>1
velocity = distance / time = 76 /18 = 4.2m
then power = 1/2 × 276 × (4.2)^2 = 138 × 17.64 = 2,434.3 jules.
this is life science
Which term is also known as a "rate of change"? * a motion b distance c reference point d speed
Acceleration is the answer.............
Solve for v
when
d = 10 and
t=5
Answer:
asfsdfasasfsda
Explanation:
Answer:
IDEK HOW TO SOLVE
Explanation:
4. A chandelier brightens a ballroom after a waiter moves a switch
Answer:
because switch moves after a waiter
Explanation:
Tom drives on a highway and never changes his speed for the whole journey. He drives for 300 miles and it takes him 5 hours. What is Tom's speed on the highway?
Answer:
QESARDFRGTSRTATFREVERSRvrvqwqv
Explanation:
vfqfvcafbraf w rfdsd AEWvd a
global climate is determined
Answer:
Global climate is determined depending on the amount of energy given from the sun to the certain area.
Example:
When it is Summer, (June, July) the Northern Hemisphere receives the most light and heat because it is tilted toward the sun.
Would a ship in Lake Ontario (fresh water) float higher or lower in the water than in the Atlantic Ocean (salt water)?
Atlantic Ocean (salt water)
In a ballistics test at the police station an officer
shoots a 6.0g bullet at 350m/s into a wooden block. If
it takes 1.8ms for the bullet to stop, what is the
average force acting on the bullet as it stops? (Hint:
ms stands for milliseconds.)
what does a steep slope line mean? in science
Answer:
Simply put, slope refers to the steepness of a line. The larger the slope, the steeper the line. Slope is often referred to as 'rise over run' because it is calculated by the change in the vertical (rise) divided by the change in the horizontal (run). ... For example, a high value of slope means a very steep line.
please help me answer these
2 Which of the following effectively summarizes paragraph 2?
A The orientation in space, relative to the Sun, is the cause
of Earth's seasonal changes.
1
B There is an imaginary pole running through the center of
Earth from the North Pole to the South Pole, which is called
an axis.
C We also learned that Earth's axis is tilted 23.5
degrees from the perpendicular of the plane of the
ecliptic.
D The northern hemisphere has more daylight hours.
Answer:B
Explanation:
The statement that summarizes the paragraph is northern hemisphere has more daylight hours.
What is Earth?The Earth is part of the nine planet and it comprises of the equator, northern and southern hemisphere.
It is the most suitable place for living because it have water,oxygen and other gases that support life.
Therefore, The statement that summarizes the paragraph is northern hemisphere has more daylight hours.
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Please help me I’ll mark brainliest
Why is a protective apron or lab coat important to use when working with acids?
Acids conduct electricity and contact could cause a shock.
Acids react with lipids and can cause damage to skin tissue.
Acids break down fabrics and can cause burns if the acids are strong.
Acids have a slippery feel and could result in a fall.
Answer:
Acids break down fabrics and can cause burns if the acids are strong.
Explanation:
A protective apron or lab coat is important when working with acids because acids break down fabrics and can cause burns if the acids are strong.
An acid is a substance that interacts with water to produce excess hydroxonium ions in an aqueous solution. A strong acid ionizes completely in solution. When they come in contact with a fabric, they break them down violently. So, if they come in contact with the skin, it causes a violent break down of body tissues. The apron acts a protective layer.Answer:
C
Explanation:
I got it right
n which order did the events forming our solar system occur?
The solar nebula became hot and dense pulling in more gas.This flattened into a rotating disk. It spun faster and faster, forming the Sun.
Gas was pulled toward the center, forming the Sun. Gas flattened into a rotating disk and became hot and dense, forming a solar nebula that spun faster and faster.
Gas flattened into a rotating disk and became hot and dense, forming a solar nebula that spun faster and faster. Gas was pulled toward the center, forming the Sun.
The solar nebula spun faster and faster and flattened into a rotating disk. Most of the gas was pulled toward the center, where it became hot and dense, forming the Sun.
Answer:
The solar nebula became hot and dense because of that it pulling in more gas. This flattened into a rotating disk. It spun faster and faster, forming the Sun.
Explanation:
hope this helps
The solar nebula became hot and dense because of that it pulling in more gas. This flattened into a rotating disk. It spun faster and faster, forming the Sun. This order did the events forming our solar system occur.
What is Solar nebula ?In the so-called nebular hypothesis of the genesis of the solar system, the Sun and planets originated by condensation from a gaseous cloud. In 1734, Swedish philosopher Emanuel Swedenborg claimed that the planets arose from a nebular crust that enveloped the Sun before breaking apart. Immanuel Kant, a German philosopher, proposed in 1755 that the Sun and planets were created by a slow rotating nebula that was eventually pushed together by its own gravitational force and flattened into a spinning disc. In 1796, the French astronomer and mathematician Pierre-Simon Laplace presented a similar concept, but with the planets forming before the Sun. The Kant-Laplace theories were criticised by the British physicist James Clerk in the late nineteenth century.
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What are the social consequences of sustainable use of land?
Major land–use changes have occurred in the United States during the past 25 years. The total area of cropland, pastureland and rangeland decreased by 76 million acres in the lower 48 states from 1982 to 2003, while the total area of developed land increased by 36 million acres or 48%. What are the potential economic, social and environmental impacts of land use changes? How does land use change affect agriculture and rural communities? What are the important economic and environmental implications for commodity production and trade, water and soil conservation, open space preservation, and other policy issues? This article addresses some of these issues and their policy implications.
On the pH scale, where can you find strong acids and strong bases?
Explanation:
The pH scale is an index ranging from 0-14 which measures the acidity or basicity of substances. The closer the pH of an acid to 0 the stronger it is and the closer the pH of a base to 14,the stronger it is.
explain why smoke particles in air move about faster if the temp of the air is increased??
Answer:
kinetic energy increases with the energy which causes the particles to move faster resulting in increases collision rates and rate of diffusion.
Explanation:
The increase in temperature of the air causes the air molecules to have more kinetic energy, which leads to more frequent and forceful collisions with the smoke particles. This, in turn, causes the smoke particles to move faster through the air.
What is kinetic energy?Kinetic energy is the energy an object possesses due to its motion. Any object that is in motion has kinetic energy, and the amount of kinetic energy it has depends on its mass and velocity.
The formula for calculating kinetic energy is:
KE = 1/2 × m × v²
where KE represents kinetic energy, m represents the mass of the object, and v represents the velocity of the object.
Here in the question,
Smoke particles in the air move around due to collisions with air molecules. When the temperature of the air increases, the average kinetic energy of the air molecules also increases. This means that the air molecules are moving faster and colliding more frequently with the smoke particles.
The smoke particles themselves do not have an increase in kinetic energy, but they do receive more energy from the collisions with the air molecules. This extra energy causes the smoke particles to move faster and more erratically, making them more dispersed throughout the air.
In addition, when air is heated, it becomes less dense. This means that there are fewer air molecules in a given volume of air. As a result, the smoke particles have more space to move around and collide with air molecules, which further contributes to their increased speed and movement.
Therefore, increasing the temperature of the air increases the speed and frequency of collisions between the air molecules and smoke particles, leading to the smoke particles moving faster and more widely dispersed throughout the air.
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how does light travel?
plaza help
Answer:
your answer will be the letter B
All I need help on, is the first one on the top row. Thanks :))
Answer:
1a)40-27=13
1b) heat
1c)efficiency = W out/W in
so 27/40= 67%
an iron rod of length 100m at 10 degree Celsius is used to measure a distance of 2km on a day when the temperature is 40 degree Celsius. Calculate the error in measuring the distance
Answer:
0.68 m
Explanation:
α = dL / L1*(dT)
dL = L1(dT) * α
Initial length, L1 = 100
Chang in Length =dL
α linear expansivity ; dL = change in length ; dT = change in temperature ; L1 = initial length
α of iron rod = 1.13 * 10^-5 k
dL = 100(40 - 10) * 1.13 * 10^-5
dL = 100(30) * 1.13 * 10^-5
dL = 3000 * 1.13 * 10^-5
dL = 3390 * 10^-5
dL = 0.0339 m
Error :
Distance measured = 2km = (2 * 1000) = 2000m
[Distance measured / (initial length + change in length)] × change in length
Error = (2000 / (100 + 0.0339)) * 0.0339
Error = (2000 / 100.0339) * 0.0339
Error = 19.993222 * 0.0339
Error = 0.6777702
Error = 0.68 m
What is radioactive dating? How is it used to determine age of something?
answer 2 question basically please Help!!!
Answer:
Technique of comparing abundance ratio between radioactive isotopes to a reference isotope to determine the age of a material called radioactive dating. It determines the age by having a more abundance of isotopes in the cellular being.
Calculate the Net force from the above Freebody diagram and data table.
answer 4
Explanation:
A horizontal net force is exerted on a 2.0 kg object at rest. The object starts at x=0 m and travels 8.0 m along a horizontal frictionless surface.
What is the velocity of the object
Round answer to 2 significant digits
____ m/s
There's a constant force of 35 N exerted on the object of mass 2.0 kg, so it undergoes an acceleration a of
35 N = (2.0 kg) a → a = 17.5 m/s²
The object travels 8.0 m, so that it attains a velocity v of
v ² = 2 (17.5 m/s²) (8.0 m) → v ≈ 16.73 m/s ≈ 17 m/s
The velocity of the 2 Kg object which travels 8 m along the horizontal frictionless surface is 17 m/s
How to determine the acceleration Force (F) = 35 NMass (m) = 2 KgAcceleration (a) =?a = F / m
a = 35 / 2
a = 17.5 m/s²
How to determine the velocity Initial velocity (u) = 0 m/sDistance (s) = 8 mAcceleration (a) = 17.5 m/s²Final velocity (v) =?v² = u² + 2as
v² = 0² + (2 × 17.5 × 8)
v² = 280
Take the square root of both side
v = √280
v = 17 m/s
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Which of the following determines and objects ability to float in water
Atomic number
Mass and volume
Displacement in a liquid
Mass and gravity
