You are standing 10 meters from a light source. then, you back away from the light source until you are 20 meters away from it. from your perspective, what has happened to the intensity of the wave?
It has decreased by a factor of four
The intensity of the wave has increased by a factor of four.
What is the intensity of light?The amount of visible light emitted per unit solid angle in time. Lumens are the measurements of how much light is emitted from a source in a given second (also known as luminous power or luminous flux). The luminosity is assessed in relation to visual perception.
The inverse Square Law of Light states that light intensity falls off rapidly with distance from its source. The intensity varies with the square of the flash-to-subject distance.
( Intensity at distance 1 ) / ( Intensity at distance 2 )
= ( Distance₂²/ Distance₁² )
In our case, Distance₁=10m and Distance₂=20m, which means that the intensity of the wave has increased by a factor of four. The ratio will be calculated as:-
20²/10²= 400/100=4,
Therefore, the intensity of the wave has increased by a factor of four.
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The result of changing a physical sound wave into an analogous electrical signal using a transducer (such as a microphone) is called
The result of changing a physical sound wave into an analogous electrical signal using a transducer (such as a microphone) is called analogue audio. In this system, the rapid electrical level is directly proportional to the rapid air pressure taken by the transducer. The analogue signal is then augmented and can be kept on an analogue medium such as tape or transformed further into a succession of discrete mathematical numbers. The advantages of using this device is that it yields a subtle sound and is pleasing to the ear by pushing the signal level and overdriving it. But the disadvantages are editing it would be tedious and prone to degradation.
A gas occupies 210 ml at -73°c. to have the same gas occupy 360 ml: should the temperature be increased or decreased? what is the new temperature? k
Answer:
1. Increased
2. 340
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Explanation:
When calculating power what two pieces of information are needed?
A. Watts and Time
B. Distance and Mass
C. Work and Mass
D. Work and Time
_______ is the most effective nuclear bullet.
Neutron is the most effective nuclear bullet.
What are nuclear bullets?Even as depleted uranium, or DU, is extraordinarily dense and may punch via thick tank armor, many accept as true that those shells release small doses of radiation, like miniature neutron bombs. The U.S. has used DU shells in Iraq, Afghanistan, and Syria.
There are currently no recognized gun-type guns in the provider: advanced nuclear weapon states tended to abandon the design in favor of implosion-type weapons, boosted fission weapons, and thermonuclear weapons. New nuclear bullet states have a tendency to increase boosted fission and thermonuclear guns best.
There are currently no known gun-kind weapons in provide: advanced nuclear weapon states tended to desert the design in choose of implosion-kind weapons, boosted fission weapons, and thermonuclear weapons. New nuclear weapon states generally tend to expand boosted fission and thermonuclear guns handiest.
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Which distance can be most accurately measured with a ruler?
a. the size of an object under a microscope
b. the width of a book
c. the length of a river
d. the distance between two cities?
The answer is a width of a textbook. It is usually has centimeter and millimeter units on it. Since rulers are most commonly 15 or 30 cm long, it could only be used to measure the length or width of small things like small tin, or the length of a piece of paper. A length of a river and the distance between two cities cannot be measured by a ruler, there is proper equipment for that, the same goes for the size of an object under the microscope.
Karen is running forward at a speed of 9 m/s. She tosses her sweaty headband backward at a speed of 20 m/s. The speed of the headband, to the nearest whole number relative to a stationary observer watching Karen, is _____ m/s
Answer:
-11 m/s
Explanation:
a lot simpler than that above me
Outside controlled airspace, the minimum flight visibility requirement for vfr flight above 1,200 feet agl and below 10,000 feet msl during daylight hours is
A movie stunt driver on a motorcycle speeds horizontally off a 50.0 m high cliff. how fast must the motorcycle leave the cliff-top if it is to land on level ground below, 90.0 m from the base of the cliff where the cameras are
Answer:
The Horizontal component of initial velocity (V0x) must be 28.18 m/s.
Explanation:
Vertical distance = y = 50m
Horizontal distance = x = 90 m
We know that,
x = x0 + V0xt
where,
x0 = Initial distance in horizontal direction = 0
V0x = x/t = 90/t ……… (i)
As,
y = y0 + V0y + ½ gt^2
where,
y0 = Initial distance in vertical direction = 0
V0y = Vertical component of initial velocity = 0
So,
t = √(50)(2)/(9.8)
t = 3.194 s
Put t = 3.194 s in equation (i),
V0x = 90/3.194
V0x = 28.18 m/s
What happens to an electric current when it flows through an object with resistance?
Calculate the kinetic energy (in units of kj and ft-lbf) for a 908 kg automobile traveling at 89 km/hour
Kinetic
energy is the energy that is possessed by an object that is moving. It is
calculated by one-half the product of the mass and the square of the velocity
of the object. We calculate as follows:
KE = mv^2 / 2
KE = 908 kg (89 km/hr ( 1000 m / 1 km) ( 1 hr / 3600 s ))^2 / 2
KE =
277479.48 J or 204658.05 ft-lbf
Why are renewable sources of energy better than nonrenewable sources?
Answer:
Explanation:
Renewable energy such as solar energy, wind energy, geothermal energy and hydropower are inexhaustible and obtained from natural sources. This energy can be replenished. Whereas, the non-renewable energy sources such as coal and petroleum products are exhaustible energy. They cannot be replenished. It takes millions of years to form non-renewable energy. The non-renewable energy cause pollution but renewable energy is environment-friendly without being depleted. Therefore, renewable sources of energy better than non-renewable sources.
In general, what is true of the alpha star in a constellation?
Final answer:
The alpha star in a constellation is generally the brightest within that constellation, as designated by the Bayer system, using Greek letters such as Alpha Centauri or Alpha Orionis for Betelgeuse.
Explanation:
The alpha star in a constellation is named using a system introduced by Johann Bayer in 1603, which designates stars with Greek letters according to their brightness within that constellation. The alpha star is typically the brightest star in its constellation. For example, Alpha Centauri is the brightest star in the Centaurus constellation, visible from south of the equator. Similarly, Alpha Orionis, or Betelgeuse, is the brightest star in the Orion constellation. Stars like Sirius, Vega, and Altair also fall under this naming system. Apparent brightness is subject to change over long periods due to stars' space velocity, making certain stars more prominent in our skies at different times.
The designation of stars within a constellation also serves astronomy and celestial navigation, highlighting important features of the celestial sphere. Not all stars within the vicinity of the Sun are equally visible or as bright, with only a few within 26 light-years appearing among the brightest in our sky. The alpha designation helps us identify and catalogue these celestial bodies systematically.
Refraction of sound waves often takes place when:
A. there are temperature differences in air
B. there are walls around a room to bounce back sound
C. sound wave frequencies are increased
D. complete sound waves slow down
Refraction of sound waves occurs when there are temperature differences in the air, causing the sound waves to change direction due to changes in speed.
Explanation:Refraction of sound waves often takes place when there are temperature differences in the air. This is option A of the student's question. The phenomenon of refraction in sound occurs when sound waves travel from one medium to another medium with a difference in temperature. This causes a change in the speed of sound wave, leading to a change in direction, or refraction. For instance, during a hot day, the air near the ground is hotter than the air above. Here, the speed of sound is faster closer to the ground, causing the sound waves to bend upwards.
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which of the following is not in our solar system
star
black hole
asteroid
comet
A billiard ball strikes and rebounds from the cushion of a pool table perpendicularly. the mass of the ball is 0.38 kg. the ball approaches the cushion with a velocity of +2.50 m/s and rebounds with a velocity of -1.90 m/s. the ball remains in contact with the cushion for a time of 3.40 × 10-3 s. what is the average net force (magnitude and direction) exerted on the ball by the cushion? f = entry field with correct answer entry field with incorrect answer entry field with correct answer
The average net force exerted on the billiard ball by the cushion is -491.76 N in the opposite direction of the initial velocity of the ball.
Explanation:The average net force exerted on the billiard ball by the cushion can be calculated using the impulse-momentum theorem. The impulse is equal to the change in momentum of the ball, which is the product of the mass of the ball and the change in velocity. In this case, the initial velocity is +2.50 m/s, and the final velocity is -1.90 m/s. The change in velocity is therefore (-1.90) - (+2.50) = -4.40 m/s. With a mass of 0.38 kg, the change in momentum is (-4.40) * (0.38) = -1.672 kg*m/s.
The average net force is equal to the impulse divided by the time of contact, which is 3.40 × 10-3 s. Therefore, the average net force is (-1.672) / (3.40 × 10-3) = -491.76 N. Since the force is negative, the direction of the force exerted on the ball by the cushion is opposite to the initial velocity of the ball.
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The average net force exerted on a 0.38 kg billiard ball by a cushion when it rebounds perpendicularly with a change in velocity from +2.50 m/s to -1.90 m/s during a contact time of 3.40 × 10-3 s is 494 N. This force is in the direction opposite to the motion of the ball.
Explanation:The direction of the force exerted by the cushion would be in the opposite direction of the movement of the ball and its magnitude can be calculated using Newton's second law, F = ma, where F is force, m is mass, and a is acceleration. Here, we first need to calculate the acceleration by subtracting final velocity from initial velocity and dividing it by the time of contact. So, acceleration = (final velocity - initial velocity) / time = (-1.90 m/s - 2.50 m/s) / 3.40 × 10-3 s = -1300 m/s². Now, we can find the force: F = ma = 0.38 kg * -1300 m/s² = -494 N. Hence the cushion exerts an average force of 494 N in the negative or opposite direction.
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An architect finds some unlabeled dimensions on a blueprint, and no scale is shown. a 15-ft. wall that has already been built measures 1.5 in. on the drawing. a new wall that has to be built measures 3 in. on the drawing. how long will the new wall be?
Answer:
30
Explanation:
An architect finds some unlabeled dimensions on a blueprint, and no scale is shown. a 15-ft. wall that has already been built measures 1.5 in. on the drawing. a new wall that has to be built measures 3 in. on the drawing. The new wall be 3- ft.
What is blueprint?The location of elements like doors, windows, sinks, and appliances as well as the style of the building are all shown in blueprints, a sort of construction sketch. Simply put: You will need a set of blueprints in order to create a building.
An architect finds some unlabeled dimensions on a blueprint, and no scale is shown. a 15-ft. wall that has already been built measures 1.5 in. on the drawing. a new wall that has to be built measures 3 in. on the drawing. The new wall be 3- ft.
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A car is raised a certain distance in a service-station lift, thus giving it potential energy relative to the floor. if it were raised twice as high, how much more potential energy would it have?
Type the correct answer in the box. Round your answer to the nearest whole number. The mass of Venus is 4.87 × 1024 kilograms, and the mass of Jupiter is 1,898 × 1024 kilograms. The mass of Jupiter is about times the mass of Venus.
The gravitational effect on other bodies determines the weight (or the mass) of a planet. We must somehow measure the strength of its "tug" on another object in order to use gravity to find the mass of a planet. We can harness Newton's equations to deduce what the mass of the planet must be through observing the time it takes for the satellite to orbit its primary planet.
Given:
Mass of Venus = 4.87 x 1024 kg
= 4986.88
Mass of Jupiter = 1.898 x 1024 kg
= 1943.552
Mass of Jupiter compared to mass of Venus
1943.552 / 4986.88
= 0.3897330595482546
= 0.3897330595482546 x 100%
= 38.97%
So, in this problem, the mass of Jupiter is about 0.39 times the mass of Venus.
A group of a few thousand stars that are loosely held together by gravity is called a
If the pressure on a gas sample is tripled and the absolute temperature is quadrupled, by what factor will the volume of the sample change?
Where did your energy come from? What types of energy conversions took place that allowed you to complete the laboratory activity? Describe the three steps energy diagram on the examples tab of energy conversions section of the why page. This is for the rube goldberg device. plzzzzz help
A car drives 215 km east and then 45 km north. What is the magnitude of the car’s displacement? Round your answer to the nearest whole number.
Answer:
220
Explanation:e2020
When you encounter a yellow light as you approach an intersection what is the safest approach to take?
Final answer:
When approaching a yellow light at an intersection, the safest approach is to slow down and prepare to stop unless stopping is unsafe or impossible due to proximity. Traffic engineers take into account the 'no-win' zone to minimize the chances of an accident. Speeding up to beat the yellow light increases the risk of accidents and is not recommended.
Explanation:
Safest Approach at a Yellow Light
When you encounter a yellow light at an intersection, the safest and legally correct approach is to prepare to stop if it is safe to do so. A yellow light is a warning that the light will soon turn red. You should only proceed through the intersection if you are already so close to it that stopping would be unsafe or impossible due to the short stopping distance. It is not advisable to speed up to try to ‘beat’ the yellow light, as this can increase the risk of accidents.
Understanding Traffic Engineer Considerations
Traffic engineers design the duration of the yellow light to minimize what is known as the “no-win” zone. This is a position too far from the light to pass through the intersection before the light turns red, and too close to safely stop without entering the intersection. The appropriate “yellow time” is calculated to allow drivers in most situations to either pass through the intersection safely or to stop in time.
Special Circumstances
There can be circumstances where a driver might assess the situation differently, such as the example of driving a pregnant woman to the hospital at 4am with no other cars around. However, legally and typically for safety, the best action is to prepare to stop when you see a yellow light.
The volume of a gas with a pressure of 1.2 atm increases from 1.0 l to 4.0 l. what is the final pressure of the gas, assuming constant temperature? tip: use boyle's law
Answer:
Final pressure of he gas is 0.3 atm.
Explanation:
It is given that,
Initial pressure of the gas, P₁ = 1.2 atm
Initial volume of the gas, V₁ = 1 L
Final volume of the gas, V₂ = 4 L
We need to find the final pressure of the gas. It can be calculated using Boyle's law as :
[tex]P_1V_1=P_2V_2[/tex]
[tex]P_2=\dfrac{P_1V_1}{V_2}[/tex]
[tex]P_2=\dfrac{1.2\ atm\times 1\ L}{4\ L}[/tex]
[tex]P_2=0.3\ atm[/tex]
So, the final pressure of the gas at constant temperature is 0.3 atm. Hence, this is the required solution.
How many hours are required to make a 4400-km trip across the united states if you average 80 km/h?
time = distance/speed
Final answer:
The time required to make a 4400-km trip across the United States, averaging 80 km/h, is 55 hours.
Explanation:
To calculate the time required for a trip, the formula you use is time (t) equals the distance (d) divided by the average speed (v), often expressed as t = d / v. In this case, the distance of the trip is 4400 kilometers, and the average speed is 80 kilometers per hour (km/h). Therefore, the time required for the trip is calculated as follows:
Distance (d) = 4400 km
Average speed (v) = 80 km/h
Time (t) = Distance ÷ Average speed
Time (t) = 4400 km ÷ 80 km/h
Time (t) = 55 hours
The trip would take 55 hours if you average 80 km/h.
If the nile river empties into the mediterranean sea in which direction does it flow
The Nile River empties into the Mediterranean Sea in the direction of flow from South to North. It is a common mistaken belief that water will flow from North to South because of the Earth’s rotation. It is not the case for Nile River since it is located at the elevated land of a hill. It is natural that the water flow must be from top down to the bottom. The Nile River will flood only once a year and its flow will start at Lake Victoria down to the Mediterranean coast.
How long does it take anya to cover the distance of 5.00 miles ?
To determine the time it takes to cover 5.00 miles at 9.5 mi/h, you can use the formula Time = Distance / Speed, giving approximately 31.58 minutes.
Explanation:To calculate how long it takes Anya to cover the distance of 5.00 miles, given the speed of a runner, we can use the formula:
Time = Distance / Speed
If a marathon runner averages 9.5 mi/h, we would substitute the values into the formula to find the time:
Time = 5.00 miles / 9.5 mi/h
Time = 0.5263 hours
To convert the time from hours to minutes, we multiply by 60 minutes per hour:
Time = 0.5263 hours × 60 minutes/hour
Time = 31.58 minutes
Therefore, it would take approximately 31.58 minutes for Anya to cover a distance of 5.00 miles at a speed of 9.5 mi/h.
The seatbelt across your chest should have about ________ fist width of slack.
An fm radio station broadcasts electromagnetic radiation at a frequency of 101.7 mhz. the wavelength of this radiation is ________ m.