Answer:
313.92w
Explanation:
Formula for power:
P=W/∆t = Fv
Givens:
m=20kg
∆y=4.0m
∆t=2.5s
a=9.81m/s²
In order to find power, we first need to solve for work.
W=Fd (force*displacement), f=mg
W=mg∆y
W=(20kg)(9.81m/s²)(4.0m)
W=784.8J
P=W/∆t
P=784.8J/2.5s
P=313.92 watts
A car can move from rest to 35 m/s in 5.0 seconds. It's acceleration is
a. 7.0 m/s^2
b. 5.0 m/s^2
c. 4.0 m/s^2
d. 175 m/s^2
Answer:
A) 7.0 m/s²
Explanation:
Acceleration is found by using the formula:
a = Δv/ΔtThis means the change in time divided by the time interval will give us the car's acceleration.
Since the car starts from rest, its initial velocity is 0 m/s. Its final velocity is 35 m/s. The time interval for the car to go from 0 to 35 m/s is 5.0 seconds.
a = (v - v₀)/tSubstitute the final and initial velocity into the formula.
a = (35 - 0)/5 a = 35/5a = 7The acceleration of the car is A) 7.0 m/s².
10 turns of wire are closely wound around a pencil as shown in the figure. when measured using a scale as shown, the length of total turns is obtained 25mm. then a) What is the thickness of the wire? b) Express the thickness of the wire in centimetre.
please write correct answer
Answer:
a. The thickness of the wire is 2.5 mm.
b. The wire is 0.25 cm thick.
Explanation:
Number of turns of the wire = 10
The length of total turns = 25 mm
a. The thickness of the wire can be determined by;
thickness of the wire = [tex]\frac{length of total turns}{number of turns}[/tex]
= [tex]\frac{25}{10}[/tex]
= 2.5 mm
Therefore, the wire is 2.5 mm thick.
b. To determine the thickness of the wire in centimetre;
10 mm = 1 cm
So that,
2.5 mm = x
x = [tex]\frac{2.5}{10}[/tex]
= 0.25 cm
The wire is 0.25 cm thick.
PLEASE if you see these people (they all seem to have the same profile picture) NOTIFY THE PERSON ASKING THE QUESTION THAT THIS IS MALWARE AND REPORT IT!!
Stay safe, everyone!
(posting this in all subjects)
Answer:
ʕ •ᴥ•ʔ
Explanation:
A sound wave has a speed of
330 m/s and a wavelength of
0.372 m. What is the frequency
of the wave?
(Unit = Hz)
Explanation:
use the formula
speed = frequency x wavelength
330 = frequency x 0.372
330 / 0.372 = frequency
887 Hz = frequency
hope this helps, please mark it brainliest
Which of these colors are the main colors of visible light? (Select all that apply.) green violet pink red indigo gold peach
Answer: The main colours of the visible light include:
--> red
--> Green
--> indigo
--> violet
Explanation:
Electromagnetic waves are waves that do not require or need a material medium for its propagation, but they travel successfully in free space (vacuum). These waves exist with an enormous range of frequencies called the electromagnetic spectrum.
Electromagnetic spectrum is defined as the range of all radiation possessing the special characteristics of electromagnetic waves arranged in order of their wavelength or frequency. The electromagnetic spectrum is made up of radio waves, infrared radiation, VISIBLE LIGHT, ultraviolet rays x- rays, gamma rays.
VISIBLE LIGHT: This is a small spectrum from the enormous range of frequencies of electromagnetic radiation. It provides radiant energy and makes things possible to be seen. The wave ranges from 4.5× 10^-7m to 7.0× 10^-7m. When the visible light is passed through a prism, it disperses into different wavelengths according to the colour make up. Dispersion of visible light produces the colors red (R), orange (O), yellow (Y), green (G), blue (B), (I) indigo and violet (V).
Therefore from the options given, red, Green, indigo and violet are examples of visible light spectrum.
4. A force of 185.6 N is being applied to a square of side length 3 m. Work out the
pressure on the square to 3 significant figures.
Answer:
[tex]p = f \div a[/tex]
[tex]p = \frac{185.6}{ {3}^{2} } = \frac{185.6}{9} = 20.6pa[/tex]
3. A diagram showing the location of protons, neutrons, and ALL of the electrons in an atom.
A. Bohr Model
B. Orbital
C. Isotopes
D. Atomic number
Please answer this ASAP
Answer:
Bohr Model
Explanation:
what would happen if a paper clip that is not a permanent magnet was brought close to the south pole of a permanent magnet?
Answer:
Because this pole is different from the original pole that magnetized the paperclips, the top paperclip will become demagnetized in the opposite direction and the bottom paperclip will be repelled away
How much force is needed to accelerate a toy car of mass 8 kg at 2m/s
Answer:
4N
Explanation:
f = ma
8kg x 2m/s = 4N
What is the momentum of a 4000g object moving to the left (negative direction) at 25 m/s?
Answer:
-100 kg · m/s
Explanation:
We can find the momentum of an object using the formula:
p = mv where p = momentum (kg * m/s), m = mass (kg), v = velocity (m/s), and p and v are vectorsLet's start by converting the mass of the object to kilograms.
4000 g → 4 kgSince the left direction is the negative direction, we know that the velocity of the object is -25 m/s.
Using these variables, we can solve for p in the formula.
p = mv p = (4 kg)(-25 m/s) p = -100 kg · m/sThe momentum of the object is -100 kg · m/s.
If you rub a glass rod with a piece of silk, the rod becomes positively charged. This means that
Protons have moved to the rod
Friction destroyed the electrons in the rod
The silk has become negatively charged
Glass attracts more protons
Answer:
The silk has become negatively charged
*A 15000 kg railroad car travels on a horizontal track with a constant speed of 12 m/s. A 6000 kg load is dropped onto the car. What will be the car's speed?
Answer:
8.57 m/s
Explanation:
From the question,
The total momentum of the car before the load was dropped = Total momentum of the call after the load was dropped.
Mu = (M+m)V........................... Equation 1
Where M = mass of the car, u = initial speed of the car, m = mass of the load, V = final speed of the load.
make V the aubject of the equation
V = mu/(M+m)...................... Equation 2
Given: M = 15000 kg, m = 6000 kg, u = 12 m/s,
Substitute these values into equation 2
V = (15000×12)/(15000+6000)
V = 180000/21000
V = 8.57 m/s
Which applications, either for diagnostic purposes or for therapeutic purposes, involve the use of X-rays? Check all that apply.
Answer:
1, 3, 7, 8
Source:
Trust me bro
A 1750 kg Ford Mustang Convertible and a 2222 kg Dodge Ram 4x4 truck were involved in a head on car crash. The Mustang initially moving at a velocity of 20 m/s rebounds off the truck with a velocity of 12 m/s. After the collision, the Dodge Ram rebounds with a velocity of 5 m/s. What was the velocity of the Dodge Ram before it collided with the Mustang?
Answer:
-1.3 m/s
Explanation:
It won't allow me submit, so be good to check the attachment
Answer:
-1.3 m/s
Explanation:
A magnet is moved in and out of a coil of wire connected to a high-resistance voltmeter. If the number of coils doubles, the induced voltage
A. Doubles
B. Is the same
C. Halves
D. Quadruples
Answer:
A. Doubles.
Explanation:
In an electromagnetic device such as a generator, when a wire (conductor) moves through the magnetic field between the South and North poles of a magnet, an electromotive force (e.m.f) is usually induced across a wire
The mode of operation of a generator is that a metal core with copper tightly wound to it (conductor coil) rotates rapidly between the two (2) poles of a horseshoe magnet type. Thus when the conductor coil rotates rapidly, it cuts the magnetic field existing between the poles of the horseshoe magnet and then induces the flow of current.
When a high-resistance voltmeter is connected to an electric circuit, a deflection will arise due to the flow of electricity. Moving the magnet towards the coil of wire will cause the needle of the high-resistance voltmeter to move in one direction. Also, as the magnet is moved out from the coil of wire, the needle of the high-resistance voltmeter moves in the opposite direction.
In this scenario, a magnet is moved in and out of a coil of wire connected to a high-resistance voltmeter. If the number of coils doubles, the induced voltage doubles because the number of turns (voltage) in the primary winding is directly proportional to the number of turns (voltage) in the secondary winding.
If the number of coils doubles, the induced voltage will be doubled. Option A is correct. Faraday's law of induction is used to describe the induced voltage.
What is induced voltage?The induced voltage is a result of electromagnetic induction. The procedure of producing emf (induced voltage) by exposing a conductor to a magnetic field is known as electromagnetic induction
A magnet is moved in and out of a wire coil connected to a high-resistance voltmeter in this scenario.
Because the number of turns (voltage) in the primary winding is directly proportional to the number of turns (voltage) in the secondary winding, doubling the number of coils doubles the induced voltage.
If the number of coils doubles, the induced voltage will be Doubles.
Hence option A is correct.
To learn more about the induced voltage refer to the link;
https://brainly.com/question/19482771
Why are p waves unable to reach the shadow zone
Explanation:
The Shadow zone is the area of the earth
from angular distances of 104 to 140 degrees from a given earthquake that does not receive any direct P waves
Describe the series of events that occurs when you place a call from a cordless telephone.
Answer:
you have no internet connection
Which diagram Most accurately represents the effect of the gravitational pull of the moon on earth ocean tides
Answer:
It can't be c because the waves have to be pulled towards the moon.
d looks dodgy. im not sure if its b, but a looks the most promising.
Figure b represents the effect of the gravitational pull of the moon on earth ocean tides.
What is gravitational potential?The effort per unit mass required to move an object from a set reference position to a given place is the gravitational potential at that location. With mass assuming the function of charge, it is comparable to the electric potential.
Gravity is stronger for objects with higher mass. Along with distance, gravity weakens as well. Therefore, the gravitational force of two things becomes stronger the closer they are to one another. The mass of the Earth is what creates gravity. The total gravitational force of all of its mass acts on the mass in your body.
Figure b represents the effect of the gravitational pull of the moon on earth ocean tides.
To learn more about gravitational potential refer to the link:
brainly.com/question/15978356
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An automobile is traveling away from Jill and towards Jack. The horn is honking, producing a sound wave.
a. Towards which person do the sound waves travel the fastest?
b. Who will hear the highest frequency? Why?
Answer:
a. The sound will travel at the speed to both Jill and Jack
b. Jack
Explanation:
a. Doppler effect describes how the frequency of a sound wave changes with regards to an observer that has relative motion to the sound source;
The Doppler effect is given by the following formula;
For a sound that is moving away, as observed by Jill, we have;
[tex]f' = \dfrac{(v - v_0)}{(v + v_s)} \cdot f = \dfrac{v }{(v + v_s)} \cdot f[/tex]
For approaching sound, as observed by Jack, we have;
[tex]f' = \dfrac{(v + v_0)}{(v - v_s)} \cdot f = \dfrac{v }{(v - v_s)} \cdot f[/tex]
Where;
f = The sound wave's actual frequency
f' = The frequency of the moving sound to the observer
v = The speed of the sound wave
v₀ = The observer's velocity = 0
[tex]v_s[/tex] = The velocity of the source (the automobile honking) of the sound wave
From the above equation, we have that the speed of sound, 'v', is the same to both the source, and the observer although the frequency, and therefore, the wavelength of the sound alternatively increases or decreases
b. From the Doppler effect equation, the person who will hear the highest frequency is given by the formula for the frequency when the sound is approaching the observer, which has the lower denominator
Therefore, given that the automobile is travelling towards Jack, jack will hear the higher frequency
Alright boys and girls I'll try and keep things like totally simple for all of u.
How does doubling the height of the cylinder affect its gravitational potential energy? (GPE = mgh)
The gravitational potential energy doubles.
The gravitational potential energy is reduced by half.
The gravitational potential energy quadruples.
The gravitational potential energy is not affected by height.
Help me and I'll give u a lollipop cherry red <3
Answer:
If you're using Edge 2021 it is A
(Give the other person Brainliest)
Explanation:
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q(≧▽≦q)
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A particle with an electric charge of 2*10-3^C is a distance of 5 m from a particle with a charge of 8*10-5 C . What is the strength of the electrostatic force between the two particles?
Answer:
F= K q1q2/r^2
K is a constant uqual to= 9 x 10^9 N m^2 C^-2
F= 9 x 10^9 x 2 x 10^-3 x 8 x 10^-5/25
F= 1440/25= 58N
A second hand on a clock has a radius of 10 cm what is the circumference of a circle around which the secondhand travels
Which statements describe how heat flows in foil? Check all that apply.
Answer:
Heat flows from a warmer object to a cooler object.Delilah does 170 Joules of work in 30 seconds. Adam does 260 Joules of work in 20 seconds. Who was more powerful?
Power = [tex]\frac{Work}{Time}[/tex]
Delilah: 170J/30s = 5.66 W
Adam: 260J/20s = 13 W
Help what is the answer pls
Sort by LUSTER. Is there a relationship between color and luster? How are they similar or different?
Color is..blue, red, black... basically COLORS. Whereas luster is like a soft glow or gentle sheen kinda like something is shining. You could say the luster of the blue paint is beautiful.
Explanation:
Bowchiclawowowow
Wat would happen if a feather and a ball were released from the same height at the same time? Gravity Experiments for Kids – Science Experiments for Kids
Answer:
They would land at the same time
Explanation:
They would land at the same exact time.
As weird, impossible and unbelievable as it appears. When in a vacuum, every weight, body and material when released from the same height would land on the ground at the same time. This also means that like in the question, a feather and a ball would land at the same time. And just for illustrations as well, a feather and a car would land at the same time as well.
What is the net force on an object with a normal force of 750 N and gravity applying 750 N?
Answer:
[tex]Net_{F}[/tex] = 750N - 750N = 0N
Explanation:
The forces are balanced and there is no average Net force
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Hope this helps! :)
What is one reason that electromagnetic waves are used in long-distance communication?
A. They travel rapidly.
B. They move matter easily
C. They do not lose energy over long distances.
D. Informatioŋ can be encoded in the wave speed.
One reason that electromagnetic waves are used in long-distance communication is, that they do not lose energy over long distances. So Option C is correct
What are electromagnetic waves ?Electromagnetic waves are a type of wave that consists of oscillating electric and magnetic fields. They are propagated through space or through a material medium, and they have the ability to travel through a vacuum, which is the absence of matter. Electromagnetic waves have a wide range of frequencies, which determines the type of electromagnetic wave. The most familiar types of electromagnetic waves include radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays.
One of the property of the electromagnetic waves is that they do not lose energy over long distances.
To know more about electromagnetic waves check:
https://brainly.com/question/16515517
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Which happens when sound waves enter a vacuum?
A. They are reflected.
B. They move slower
C. They move faster
D. They stop moving