Final answer:
When a light bulb filament is at the focal point of a convex lens, parallel light rays emerge. The convex lens refracts the light so that rays diverge within the lens and exit parallel, creating a focused beam used in devices like flashlights.
Explanation:
When a light bulb filament is placed at the focal point of a convex lens, the light rays that emerge from the other side are parallel light rays. This effect is due to the properties of convex lenses and their interaction with light. In a convex lens, parallel rays of light are refracted in such a way that they converge at the lens's focal point. Conversely, when a light source is placed at that focal point, the rays diverge within the lens, but then leave the lens parallel to each other. This phenomenon is utilized in various devices such as flashlights, lighthouses, and traffic lights to create a focused and directional beam of light. Option C
The science behind this involves the law of refraction, which dictates that light changes direction when it passes through materials of different densities, like air and glass. In the case of the convex lens, the curvature of the lens and its refractive properties cause the light rays from the focal point to exit parallel. This design ensures that the output beam spreads minimally, providing a strong, directional source of light.
Which one of the following is the pigment found in redheads?
a) Keratin
b) Melanin
c) Pheomelanin
d) Cortex
Pheomelanin is the pigment found in redheads. The correct option is C.
Pheomelanin is the pigment found in redheads. It is a cysteine-containing red polymer responsible for red hair and other pigmentation.
A ball is sitting at rest on the floor. What will happen if a balanced force is applied to the ball? *
(1 Point)
It will roll in the direction of the weakest force.
It will roll away from the force.
It will remain at rest.
12456787980-1234567890
Answer:11222220090
Explanation:
Answer:
11222220090
Explanation:
Cross country skier moves 32 m west word than 54 m east word and finally 68 m westward what is the distance moved?
Answer:
154m
Explanation:
Distance moved
= 32m + 54m + 68m
= 154m
4. Solid ‘X’ turns into a liquid at 80 0C and into a gas at 140 0C. Describe the changes in the
particles of X when it is heated from
a. 70 0C to 85 0C
Answer:
Explanation:
The melting point of the solid is 80°C
Vapor point of the liquid is 140°C
What happens to particles of X when heated from 70°C to 85°C?
Firstly, there would be a phase change from solid to liquid. Below the melting point, a substance will exist as a solid. With increase in thermal energy inputted by heat, as the temperature climbs above the melting point, it changes to the liquid. When the solid begins to heat up, the particles of X starts vibrating about their fixed point. At they melting point, they break lose and flow to form a liquid. The particles will have more kinetic energy.what is one benefit of lifelong physical activity?
Final answer:
Lifelong physical activity provides multiple health benefits, including cardiovascular and muscular fitness, improved bone density, cognitive function, and weight management, which contribute to a better quality of life and extended life expectancy.
Explanation:
One significant benefit of lifelong physical activity is the improvement of overall health, which manifests in multiple dimensions. Engaging in physical activity from a young age helps in maintaining cardiovascular and muscular fitness, improving bone density and strength, enhancing cognitive function, and aiding in weight management. Moreover, regular exercise contributes to improved quality of life and can extend life expectancy.
For instance, older adults can experience a lower risk of falls and related injuries, while individuals of all ages can enjoy benefits such as reduced risk factors for cardiovascular disease, hypertension, obesity, and certain types of cancer. Additionally, physical activity plays a protective role against mental health issues like depression, due to its potential to increase the synthesis of natural euphoriants in the brain. Crucially, even those with chronic conditions can find physical activity more beneficial than harmful, emphasizing the universal importance of an active lifestyle.
Is an 80 dB sound twice as loud as a 40 dB sound? Explain.
Answer:
Yes.
Explanation:
As decibel is a universal unit, 40Db*2=80Db.
Could someone please fill out this document and give it back to me. I'm willing to give 100 points but all answers need to be correct and show really good working out. I really need to pass this assessment or else I will fail physics.
Hi friend! I'm really sorry, but I was only able to complete the first 2 pages. The whole thing was too big, and I have a curfew (bedtime). Also, I'm only in 9th grade, and I am pretty smart for my age, so I tried to figure everything out, but it was still too confusing for me. Honestly, if you just search the formulas/equations for work, power, volts, watts, joules, etc, it will be easier for you. I have included the doc with my answers below, but the rest of it is blank. Also, I recommend double checking my answers, just to make sure that they are not wrong.
I hope this helps!
- sincerelynini
a. If you set a cannonball to 1500 m/s, what happens? Explain why you think it moves this way.
Answer:
I beleive it would shoot very far up into the sky
Explanation:
Answer:It slows down and eventually gravity pulls it to ground and it stops
Explanation:
Air resistance slows it down
Problem
Which of the following statements is true of a body that accelerates uniformly? Explain your
answer.
a. Its rate of change of position with time remains constant.
b. Its position changes by the same amount in equal time intervals.
c. Its velocity increases by increasing amounts in equal time intervals.
d. Its rate of change of velocity with time remains constant.
Explanation:
The acceleration of a body is defined as the rate of change of velocity per unit time. Its mathematical form is given by :
[tex]a=\dfrac{v-u}{t}[/tex]
Here,
u is initial speed of a body
v is final speed
t is time taken
Uniform acceleration means that the velocity of an object changes by an equal amount in every equal time period. Hence, the correct option is (c) " Its velocity increases by increasing amounts in equal time intervals".
Which of the following statements describes an actual orbit?
O
A. The Moon is a satellite of Earth.
O
B. The Sun is a satellite of Earth.
O
C. Earth is a satellite of the planet Jupiter.
O
D. The planet Jupiter is a satellite of Earth.
The Moon is a satellite of Earth. This statement describes an actual orbit. Hence, option (A) is correct.
What is orbit?An orbit is the curved path taken by an object in celestial mechanics, such as the path taken by a planet around a star, a natural satellite around a planet, or an artificial satellite around an object or location in space, such as a planet, moon, asteroid, or Lagrange point.
Typically, the term "orbit" refers to a trajectory that repeats itself on a regular basis, though it can also apply to a non-repeating trajectory. According to Kepler's rules of planetary motion, planets and satellites roughly follow elliptic orbits, with the center of mass orbiting at a focal point of the ellipse.
Hence, the Moon is a satellite of Earth. This statement describes an actual orbit.
Learn more about orbital here:
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The highest occupiable floor of any building is in the Sears Tower in Chicago. The elevators of the central tower of the building lift passengers 436.0 m above street level. If a continuous forces of 22310 N is exerted on one of these elevator cars as it travels from the ground to the top floor, how much work is done on the elevator car by the elevator's lifting mechanism?
Answer:
9727160J
Explanation:
Given parameters:
Height of elevator rise = 436m
Force exerted = 22310N
Unknown:
Work done by the elevator lifting mechanism = ?
Solution:
The work done by a body is the force applied to move a body in a specific direction;
Work done = force x distance moved
In this case, the force and distance moved is provided already;
Work done = 22310 x 436 = 9727160J
The work done on the elevator car by the elevator's lifting mechanism is calculated using the work formula which is the product of the exerted force and the distance travelled, resulting in a total work of 9,731,160 joules.
Explanation:The question requires us to calculate the work done on an elevator car by the elevator's lifting mechanism. To find this out, we use the work formula:
Work (W) = Force (F) × Distance (d)
Given:
Force exerted on the elevator car, F = 22310 N Distance the elevator travels, d = 436.0 m
To calculate the work done, we multiply the force by the distance:
W = F × d
W = 22310 N × 436.0 m
W = 9,731,160 J
The work done by the elevator's lifting mechanism is 9,731,160 joules (J).
HELP!
How high above the ground would a 500 kg roller coaster car be if it had 61 740 J of
gravitational potential energy?
Answer:
The solved problem is in the photo. Hope it helps.
How to atoms behave in non-magnetic items?
Answer:
By altering the quantum interactions of the electrons in the atoms of a metal's atoms, scientists from the University of Leeds have generated magnetism in metals that aren’t normally magnetic.
Explanation:
Which process requires the addition of energy to water?
Water must absorb energy in order to melt, evaporate, or get warmer.
Jamie has a mass of 35kg what is her weight on earth in newtons
What happens when two waves pass through each other
The interference of the two waves causes its medium to take on a shape that results from the effect of the two individual waves upon the particles of the medium.
what type of meter would be connected on both sides of the resistor in a circuit
the answer IS NOT "An ammeter, which measures current"
What types of properties does light have
Answer:
In isotropic substances, there are only two optical properties that can be determined. One of these is the absorption color, as discussed above. The other is the refractive index. Tables of refractive indices for isotropic minerals, list only the refractive index for one wavelength of light.
Explanation:
Which of these is a substance or compound that kills or inhibits bacteria?
A.
an antibiotic
B.
a germ
C.
a microorganism
D.
a vaccine
Answer:
an antibiotic
Explanation:
Final answer:
An A. antibiotic is a substance or compound that kills or inhibits bacteria, and it can be a natural product of microorganisms or synthetically produced in a laboratory.
Explanation:
The substance or compound that kills or inhibits bacteria is known as an antibiotic. Antibiotics are either metabolic products produced by one microorganism to inhibit or kill other microorganisms or can be synthesized chemically in a laboratory. The effectiveness of an antibiotic may vary; some have a broad spectrum of activity against many different kinds of bacteria, while others have a narrow spectrum, targeting specific types of bacteria.
An antibiotic operates by interfering with crucial biological processes of bacteria, often by inhibiting enzymes necessary for their growth, leading to their destruction or prevention of their replication.
The volume of a fixed mass of gas is directly proportional to its
temperature if the pressure is kept constant.*
a. Boyle's law
b. Charles's law
c. gay-lucssac's law
Answer: Charles's law
Explanation:
Charles's law is one of the gas laws, and it explains the effect of temperature changes on the volume of a given mass of gas at a constant pressure. Usually, the volume of a gas decreases as the temperature decreases and increases as the temperature also increases.
Mathematically, Charles's law can be expressed as:
V ∝ T
V = kT or (V/T) = k
where v is volume, T is temperature in Kelvin, and a k is a constant.
A 600 kg car is at rest, and then accelerates to 5 m/s.
What is its original kinetic energy?
What is its final kinetic energy?
How much work was used?
Answer:
0
7500J
7500J
Explanation:
Given parameters:
Mass of car = 600kg
Velocity = 5m/s
Unknown:
Original kinetic energy = ?
Final kinetic energy = ?
Work used = ?
Solution:
The kinetic energy of a body is the energy due to the motion of a body.
It can be solve mathematically using expression below;
K.E = [tex]\frac{1}{2}[/tex] m v²
where m is mass
v is velocity
original kinetic energy;
The car started at rest and v = 0, therefore K.E = 0
Final kinetic energy;
K.E = [tex]\frac{1}{2}[/tex] x 600 x 5² = 7500J
Work done:
Work done = Final K.E - Initial K.E = 7500 - 0 = 7500J
Answer:
0 ; 7500; 7500
Explanation:
Its correct I just completed it.
4. Identify Problems A student is describing a longitudinal wave in his notebook. He
writes down "The distance between crests is 3 cm." What is wrong with what the
student recorded?
Answer:
"The distance between crests is 3 cm."
Explanation:
If he writes down "The distance between crests is 3 cm."
That means he is describing the wavelength of a wave and not longitudinal wave. He ought to write something about " direction "
Longitudinal waves are waves in which the displacement of the medium is in the same direction as, or parallel to, the direction of propagation of the wave. While
Wavelength is the distance between the two successfully Crest or trough
Which pair of concepts are closely related?
O A. radiation and inertia
B. electric and magnetic forces
C. friction and gravity
D. entropy and momentum
Answer:
I believe it would be C. friction and gravity
Explanation:
They both deal with pulling/pushing objects.
Why is lightning visible before thunder is heard?
A
Sound cannot reflect off surfaces as easily as light.
B
Sound travels slower than light can travel.
C
Sound is not processed by the brain as fast as light.
D
Sound needs a medium to travel through.
Answer:
B
Explanation:
Sound is what type of wave (Check all that applies)
Transverse
Longitudinal
Electromagnetic
Mechanical
Answer:
It's a longitudinal and mechanical wave. The the sound is transported parallel to the direction that the sound wave moves and require a medium to travel.
Explanation:
Answer:
a ,b ,e sorry if I'm wrong
Explanation:
have a great day peep's :]
Select the correct responses to the questions from the drop-down menus.
Which wind belt occurs at about about 5 degrees north and south of the equator?
Which wind belt starts at the horse latitudes and moves toward the poles?
Which winds are found primarily in the tropics?
Answer:
The first answer to the first column is Doldrums, the second is prevailing westerlies, the last answer is trade winds
Explanation:
I got this answer because I did it on the test
The wind belt that occurs at about about 5 degrees north and south of the equator is doldrums.
The wind belt that starts at the horse latitudes and moves toward the poles is the prevailing westerlies.
The winds that are found primarily in the tropics are trade winds.
Doldrums refer to the equitorial region of the Atlantic Ocean that has storms and unpredictable winds.
Prevailing westerlies are the winds that can be found in the middle latitudes which blow from high pressure area towards the pole. Trade winds are the east to west prevailing winds that flow in the equitorial region of the Earth.
Read related link on:
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Which interaction can result in a wave that has a larger or a smaller amplitude than the original waves?
Answer:
Physical Science - Chapter 20 - The Energy of Waves
A B
interference a wave interaction that occurs when two or more waves overlap
constructive interference interference that results in a wave that has a greater amplitude than that of the individual wave
diffraction the bending of waves around a barrier or through an openin
Explanation:
Question 4 of 10
2 Points
Which of the following is a cost of urban development?
O
A. Habitat fragmentation
O B. Entertainment
O C. Employment
O
D. Cultural centers
What is it
Habitat fragmentation is a cost of urban development.
Option: A
Explanation:
Though from the view point or perspective of up gradation and development urban development is much needed but in cost of habitat fragmentation which feels very bitter. As habitat fragmentation leads to the loss of habitat, disruption of ecological cycle and environmental equilibrium.
Actually in the name of urban development we the human use our bread giver environment in a wrong way which causes natural disasters in long run. Animals become endangered , vulnerable and extinct with passage of time. Because they forced to enter into human settlements.
Answer:
A
Explanation:
An electric circuit through which no current flows is known as?