45.0 W is the answer
a stationary police officer directs radio waves emitted by a radar gun at a vehicle toward the officer. Compared to the emitted radio waves, the radio waves reflected from the vehicle and received by the radar gun have a A.) longer wavelength B.) higher speed C.) longer period D.) higher frequency
Answer:
D) Higher Frequency
Explanation:
Higher frequency because it says a vehicle “towards” the officer
The word “radiation" has a negative meaning for many people. Devise an argument to illustrate the
positive aspects of radiation.
Answer: find the answer in the explanation
Explanation:
It is true that the word “radiation" has a negative meaning for many people. Nevertheless there are many uses and significant benefits of radiation to humans. Below are some of the advantages
1.) Its application is useful in Agricultural and scientific research
2.) It is used to induce mutations in plants and animals
3.) It is used in treatment of cancer
4.) It is used to sterilize equipment in hospital and also food.
5.) It is used to study defect in metals and welded joint and to check metal fatigue
6.) It is used to trace underground pipe leakages.
An astronaut in space pushes a piece of equipment to get it into the correct position. What does Newton's third law of motion tell us about this? Question 5 options: The equipment would have accelerated much faster if the astronaut had applied a much greater force to it. The equipment will "push back" on the astronaut with the same amount of force. The equipment would have stayed in the same exact location indefinitely until the very moment the astronaut applied force to it. The equipment will continue moving in the same direction indefinitely unless another force is applied to stop it.
Answer:
Newton's third law of motion can be summed up as "For every action, there is an equal and opposite reaction." This means that when the astronaut applies force to push the object, that object will apply an equal amount of force to the astronaut.
Explanation:
Newton's third law of motion can be summed up as "For every action, there is an equal and opposite reaction." This means that when the astronaut applies force to push the object, that object will apply an equal amount of force to the astronaut.
What is equal and opposite according to Newton's third law?According to Newton's third law of motion, forces always act in equal but opposite pairs. Another way of saying this is for every action, there is an equal but opposite reaction. This means that when you push on a wall, the wall pushes back on you with a force equal in strength to the force you exerted.
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Plz answer them I need answers ASAP
Answer:
4. 13.04m/s²
5. 4x10^11m/s²
6. –3m/s²
Explanation:
Acceleration is defined as rate of change of velocity with time. Mathematically it is represented as:
a = (v – u)/t
a is the acceleration.
v is the final velocity.
u is the initial velocity.
t is the time
With the above formula, we can obtain the acceleration of each question.
4. Determination of the acceleration of the spacecraft.
Data obtained from the question include the following:
Initial velocity (u) = 0
Final velocity (v) = 67.8m/s
Time (t) = 5.2secs
Acceleration (a) =..?
a = (v – u)/t
a = (67.8 – 0)/5.2
a = 13.04m/s²
Therefore, the acceleration of the spacecraft is 13.04m/s².
5. Determination of the acceleration of the electron.
Data obtained from the question include the following:
Initial velocity (u) = 0
Final velocity (v) = 2.6x10^5m/s
Time (t) = 6.5x10^-7secs
Acceleration (a) =..?
a = (v – u)/t
a = (2.6x10^5 – 0)/ 6.5x10^-7
a = 4x10^11m/s²
Therefore, the acceleration of the electron is 4x10^11m/s².
6. Determination of the acceleration of the truck.
Data obtained from the question include the following:
Initial velocity (u) = 20m/s
Final velocity (v) = 5m/s
Time (t) = 5secs
Acceleration (a) =..?
a = (v – u)/t
a = (5 – 20)/5
a = –15/5
a = –3m/s².
Therefore, the acceleration of the truck is –3m/s².
2. Elizabeth drove 30 miles to the south, then drove 50 miles to the east. Draw a
vector diagram that shows her resultant displacement. Be sure to label all vectors.
Answer: R = 58.3 miles
Explanation:
Displacement is a vector quantity. That is, it has both magnitude and direction.
As Elizabeth drove 30 miles to the south, then drove 50 miles to the east. The resultant displacement can be achieved by using pythagorean theorem
R^2 = 30^2 + 50^2
R^2 = 900 + 2500
R^2 = 3400
R = sqrt(3400)
R = 58.3 miles
The vector diagram that shows her resultant displacement is attached as a file.
Two identical cows fell into a muddy hole. One fell on its side and the other on its feet.
Which one sunk furthest into the mud and explain your answer
Answer: The one that fell on its feet.
Explanation: The sinking of the two cows will depend on the pressure exert on the mud.
Pressure is the ratio of force to area.
The one which fell on its side would exert lower pressure because of its larger side of area. While the one that fell on its feet will exert greater pressure because of small area of its feet.
Therefore, the one that fell on its feet will sink furthest into the mud because of the ratio of the force to area of its feet ( pressure) is higher.
How many kW*h (kilowatt hours) of electricity is consumed by a 500 w light bulb that burns
for seven hours?
Answer: 3.5 kWh
Explanation:
Given that the
Power P = 500 W
To convert watt to kilowatt, divide it by 1000
Power P = 500/1000 = 0.5 kw
Time t = 7 hours
Power is the rate at which work is done. That is,
P = WD/t
Cross multiply
WD = Pt
Where workdone WD is the energy E consumed in kWh .
Substitute P and t in the formula above.
E = 0.5 × 7
E = 3.5 kWh
Therefore, 3.5 kWh (kilowatt hours) of electricity is consumed by a 500 w light bulb that burns.
Which of the following is a source of visible light?
A) a cat
B) a sofa
C) a lamp
D) a plant
Answer:
The Sun
Explanation:
The Sun is a natural source for visible light waves and our eyes see the reflection of this sunlight off the objects around us. The color of an object that we see is the color of light reflected. All other colors are absorbed. Light bulbs are another source of visible light waves. hope this helps you :)
What is the basic premise of the universal gravitational law? Question 7 options: Each object in the universe that has mass attracts every other object that has mass. The motion of an object in a circular path is kept along that path due to gravitational force. The force of an object is equal to the mass of the object multiplied by its acceleration. The acceleration of an object in freefall will always be 9.8 meters per second squared, due to gravitational pull.
The correct answer is A. Each object in the universe that has mass attracts every other object that has mass.
Explanation:
The gravitational law proposed by Newton explains how the gravitational force works. The basic idea or premise in this law is that the gravitational law exists in all the universe, and occurs with all objects that have a mass. This includes the fact all objects or particles that have a mass attract all other objects with mass but this is also influenced by the distance between the objects, and the masses of each object. In this way, the gravitational force is equal to the gravitational constant multiplied by the mass of the two objects and divided by the distance between the objects.
Answer:
A. Each object in the universe that has mass attracts every other object that has mass.
Explanation:
The universal law of gravitation states that every object in the universe that has mass attracts every other object in the universe that has mass. The force increases as the mass of the objects increases, and decreases as the objects become further and further apart.
Convert 55 inches to centimeters.
I need this quick pls
The right answer is 139.7 centimetres
1 inches=2.54 centimetres
Please see the attached picture for full solution
Hope it helps
Good luck on your assignment
Answer:
139.7 cm
Explanation:
hi:)anyone able to help with (2) & explain too? Thank you :)!
Answer:
i think hit the ceiling of the aeroplane
Explanation:
hope it helps u stay safe
a(n) ______ reverses the flow of current through an electric motor.
brush
battery
armature
commutator
Answer:
D). Commutator
Explanation:
Got Correct Edge 2022.
The turning effect of a force is called a moment. Calculate the moment of a force of 3 N acting 0.2 m from a pivot
Answer:
15 Nm
Explanation:
Moment of the force = force × perpendicular distance from pivot to the line of action of the force
Moment of the force = 3 × 0.2 = 15 Nm
The moment of a force of 3 N acting 0.2 m from a pivot is 15 Newton· meter.
What is moment of force?
Torque is the rotating equivalent of force in physics and mechanics. The moment of force is another name for it (also abbreviated to moment). It illustrates how a force can cause a change in the body's rotational motion.
Mathematically, the definition of moment of force is given as:
Moment of the force = force × perpendicular distance from pivot to line of action of the force.
Given parameters:
Force acting on the object: F = 3 Newton.
Perpendicular distance from pivot to the line of action of force = 0.2 meters.
Hence, Moment of the force = 3 Newton × 0.2 meter = 15 Newton· meter.
So, the moment of a force of 3 N acting 0.2 m from a pivot is 15 Newton· meter.
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A 60 kg man jumps down from a 0.8 m table. What is the speed when he
hits the ground? ( Take g= 10 m/s2)
Answer: Speed = 4 m/s
Explanation:
The parameters given are
Mass M = 60 kg
Height h = 0.8 m
Acceleration due to gravity g= 10 m/s2
Before the man jumps, he will be experiencing potential energy at the top of the table.
P.E = mgh
Substitute all the parameters into the formula
P.E = 60 × 9.8 × 0.8
P.E = 470.4 J
As he jumped from the table and hit the ground, the whole P.E will be converted to kinetic energy according to conservative of energy.
When hitting the ground,
K.E = P.E
Where K.E = 1/2mv^2
Substitute m and 470.4 into the formula
470.4 = 1/2 × 60 × V^2
V^2 = 470.4/30
V^2 = 15.68
V = square root (15.68)
V = 3.959 m/s
Therefore, the speed of the man when hitting the ground is approximately 4 m/s
hi:) I don’t understand why acceleration of free fall is equal to gravitational field strength. anyone able to help? Thank you :)))!
Explanation:
It was learned that a free-falling object is an object that is falling under the sole influence of gravity. A free-falling object has an acceleration of 9.8 m/s/s, downward (on Earth). ... The numerical value for the acceleration of gravity is most accurately known as 9.8 m/s/s.
Hope this helps..
Explanation:
It was learned that a free-falling object is an object that is falling under the sole influence of gravity. A free-falling object has an acceleration of 9.8 m/s/s, downward (on Earth). ... The numerical value for the acceleration of gravity is most accurately known as 9.8 m/s/s.
Hope this helps..
A machine uses an input force of 200 newtons to produce an output force 1 point
of 800 newtons. What is the mechanical advantage of this machine? *
What are examples of non-conservative forces?
A)gravity
B)Friction and air resistance
C)potential energy
D)kinetic energy
Answer:
Examples of non-conservative forces are friction and resistance.
Explanation:
hi:) is part (c) correct?
Answer:
0.000253 kg/m³ (to 3 s.f.)
Explanation:
Please see attached picture for full solution.
Your working is correct but the answer should be 0.000253 kg/m³ when rounded off to 3 significant figures.
What do a mirror and a magnifying glass have in common? What makes them different?
ˆˆI mean this in terms of a physics point of view, like the angles, etc.
Answer:
They both have a reflection, but a mirror just reflects anything in front of it, while a magnifying glass helps you see closer through the reflection of something.
Explanation:
Water is a compound.
O A. True
B. False
Americium-241 is used in smoke detectors. It undergoes alpha decay with a half life of 432 years. The alpha particles ionize some of the air near the americium-241 source, and these charged ions are collected on a metal plate that has a small voltage applied to it. The collected particles cause a small electric current to flow in the detector. If smoke particles get in between the americium-241 source and the detector and reduce the current, the alarm is triggered. A typical smoke detector experiences 370000 alpha decays each second. How much time is needed for the number of decays to reduce to 93000 decays per second?
Answer:
860.6 years.
Explanation:
The parameters given are;
Initial detector activity = 370000 alpha decays per second
Final detector activity = 93000 alpha decays per second
Formula for time to change in activity is given by the following relation;
[tex]t_{93000} = \dfrac{-ln\dfrac{A}{A_0} }{\lambda} = \dfrac{-ln\dfrac{93000}{370000} }{5.08 \times 10^{-11}} = 2.72 \times 10^{10} \, seconds[/tex]
t₉₃₀₀₀ = 2.72 × 10¹⁰ seconds = 860.6 years.
What are two interchangeable terms with radiation?
Answer:
volume and dynamics
Explanation:
Was the object accelerating during the time interval labeled “B”?
A) Yes
B) No
There's not enough information in the graph to determine whether it was or it wasn't. It could have been, but we can't tell.
Before I explain this answer, it's VERY important to know exactly what "accelerating" means:
-- "Accelerating" does NOT always mean "speeding up".
-- "Accelerating" means ANY change in velocity.
-- That can be ==> speeding up, or ==> slowing down, or ==> turning.
This graph is labeled "Velocity vs Time", but it isn't really. "Velocity" means speed AND direction. The graph only shows us the object's speed, but nothing about its direction.
During time-interval-B, the speed isn't changing, but the object could still be changing direction, like turning a corner, or on a curved path. We don't know. The graph doesn't show us that information.
The object could be accelerating during time-interval-B. It's true that the speed wasn't changing. But maybe the direction was. If the direction was changing, then we have to say the object was 'accelerating' during the interval labeled B .
All lenses are objects that _____.
A. reflect light to create an image
B. refract light to create an image
C. reflect light to spread light rays apart
D. refract light to spread light rays apart
Answer:
B AND D ARE THE CORRECT OPTIONS
HOPE ITS HELPFUL.....
Answer:
B. refract light to create an image
Explanation:
The distance between two crests of a transverse wave is referred to as the Question 1 options: medium. amplitude. wavelength. phase.
Answer:
Wavelength
Explanation:
Wavelength
Answer:
Wavelength
Explanation:
WILL MARK BRAINLIEST!
WORTH A LOT OF POINTS!
Answer:
Explanation:
I think it’s b
A horse runs around a circular track that is 350.0 m long. He runs clockwise from
the start line back to the start line, then turns back and goes counterclockwise back
to the start line again. What is the horses displacement?
A. 0 m
B. 300.0 m counterclockwise
C. 300.0 m counterclockwise
D. 600.0 m
Answer:
A 0m
Explanation:
The horse runs clockwise round the strack, then goes back to the start line ending up back at the same place when it started.
URGENT The nuclear equation is incomplete what particle completes the equation.
Answer: A
Xenon 138
Explanation:
In the attached nuclear reaction, the sum of the mass number in LHS is
239 + 1 = 240
While the Atomic number = 54 + 0 = 54
The sum of the mass number in the RHS is 100 + 2(1) = 102
While the sum of the atomic number is
40 + 0 = 40
The mass number of the missing element is
240 - 102 = 138
While the Atomic number of the missing element is
94 - 40 = 54
Nuclear reaction at equilibrium, the mass number and the atomic number at LHS must be equal to RHS
The missing element is Xenon 138 with atomic number of 54
Therefore, when the Plutonium is bombarded with a neutron, the result of the reaction is the production of Zirconium 100 and Xenon 138 with the bombardment of two neutrons
Which law describes the magnetic field in a nonlinear wire? A. Faraday's law B. Gauss's law C. Ohm's law D. Ampère's law
Answer:
D. Ampère's law
Explanation:
I got a 5 on plato
The law that describes the magnetic field in a nonlinear wire is Ampère's law. The correct option is D.
What is Ampère's law?Ampère's law is a fundamental law of electromagnetism that describes the relationship between the electric current flowing through a wire and the magnetic field it produces. It states that the magnetic field around a closed loop is proportional to the electric current passing through the loop.
Mathematically, Ampère's law can be expressed as:
∮ B ⋅ dl = μ0I
Where B is the magnetic field, dl is an element of the closed loop, μ0 is the magnetic constant, and I is the current passing through the loop. The integral is taken around a closed path that encloses the current-carrying wire.
Ampère's law is useful in calculating the magnetic field produced by a current-carrying wire or a system of wires. It also helps to understand the behavior of magnets and how they interact with each other.
It is important to note that Ampère's law only applies to steady currents and does not take into account the effects of changing electric fields. For this, Faraday's law of electromagnetic induction is used.
Here in the Question,
A. Faraday's law: This law describes the relationship between a changing magnetic field and an induced electric field. It states that the magnitude of the induced EMF is proportional to the rate of change of magnetic flux.
B. Gauss's law: This law deals with the electric field and its relationship with electric charges. It states that the electric flux through a closed surface is proportional to the charge enclosed within the surface.
C. Ohm's law: This law describes the relationship between current, voltage, and resistance in a conductor. It states that the current flowing through a conductor is directly proportional to the voltage applied across it and inversely proportional to the resistance of the conductor.
Therefore, The correct answer is D i.e. Ampère's law.
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Most energy in the sun is created by:
A ) Hydrogen atoms fusing into larger Helium atoms
B ) Helium atoms splitting into Hydrogen atoms
C ) Hydrogen atoms splitting into Helium atoms
Answer:
it's A) Hydrogen atoms fusing into larger Helium atoms
