How much work is required to lift a 21 N rock 7 m above the ground?
Answer:
Explanation:
w=-ΔU=-HF=-21×7=-147J
If the distance around a circular track is 2.0km and if runners run 3 laps, what is the distance travelled?
a) 2 km
b) 0km
c) 3 km
d) 6 km
Answer:
d=6km
Explanation:
because multiply 2x3 is six
Describe three characteristics of electromagnetic waves that make them useful for transmitting signals.
Answer:
characteristics of electromagnetic waves:-
electromagnetic waves are transverse waves;electromagnetic waves can travel through a vacuum;electromagnetic waves travel at exactly the same speed in a vacuum, the speed of light, 300,000,000 m/s.A characteristics Feature of electromagnetic waves that make them useful for transmitting signal is that they are easily transmitted through
In physics, electromagnetic radiation is defined as waves created as a result of the electromagnetic field vibratons moving through space, carrying electromagnetic energy. The waves produced includes radio waves, microwaves, infrared, light, ultraviolet, X-rays, and gamma rays.
The character of an electromagnetic wave is dependent on its frequency or wavelength making each electromagnetic spectrum having their own range of uses.
For transmitting signals, Radio waves as well as Microwaves is useful , while the former help transmit Information through radio and TV stations the later is used in satellite communications, this is because
They are easily transmitted through air. if absorbed by the human body, cannot cause damageThier directions can be changed or switched.See more here:https://brainly.com/question/877487
15. What is velocity, and how is it useful for describing an object's motion?
Velocity describes motion by indicating how fastan object moves and in what direction. Speed is a magnitude of velocity, which indicates only how fast an object moves. Speed shows how much distance is traversed in a given interval of time: In a general case of motion,.
marissas car accelerates uniformly at a rate of -2.60m/s^2. how long does it take for marissas car to accelerate from a velocity of -28.2m/s to -42.3m/s?
Answer:
1.02s
Explanation:
In this situation the following equation will be useful:

Where:
 is Marissa's car final velocity
 is Marissa's car initial velocity
 is Marissa's car constant acceleration (assuming this is the acceleration, since 1269 m/s^{2} does not make sense)
 is the time it takes to accelerato from  to 
yall is this right
List the waves of the electromagnetic spectrum in order from Radio to Gamma waves. Be sure to also discuss what each type of wave is used for.
radio wavesAn electromagnetic wave of a frequencyAs used for long-distance Communications, microwavesMicrowaves are electromagnetic waves with wavelengths no longer than Tara Hearts wave links but relatively short for radio waves wavelength for microwaves have approximately in the range of 30 cm to1 mm, infraredHaving a wavelength greater than that of the red end of the visible light spectrum but less than the microwaves infrared radiation has a wavelength from about 800 NM to 1 mm it is emitted particular rarely my heated objects, optical Refers to electromagnetic radiation in the wavelength range between 100 NM and 1 mm the terms a light invisible radiation referred to the wavelength between 400 nm and 800 in in which can be perceived by the human eye, ultravioletThe UV region covers the wavelength range 100 to 400 in m and is divided into three brands UVA UVB and UVA CC, X-raysX-rays wavelength or shorter than the UV rays and are typically longer than those gamma rays, and gamma-rays Have the smallest wavelength and are most energy of a wave in the electromagnetic spectrum they are produced by the hottest and most energetic objects in the universe such as neutron stars and pulsars Supernova explosions and regions around black holes
Answer:
(A)
Explanation:
ITS A ok ok bye
Blue bumper car, traveling east with a force of 100 N, runs into a yellow bumper car traveling west with a force of 300 N. Because the net force will be -200 N. one of the cars will be pushed backward. Which one?
Answer:
the blue bumper car
Explanation:
because the yellow bumper car is coming in with much more force
and according to Newton, actions and reactions are equal and opposite, so the yellow bumper car will five out 300N while the blue car will give out only 100N
then it almost because a fight between 300N vs 100N
and obviously, the 300N will win and the 100N will be pushed back
when light bounces off a rough surface, in different directions, what is this called?
A box is in contact with a floor with a coefficient of friction of 0.50. If the box has a normal force of 500N, what force do have to push with to move the box? HELPPP
Answer:
250N
Explanation:
Coefficient of friction=frictional force/Normal force
coefficient of friction= 0.5Normal force(R)= 500NFrictional force (Fr)= ?0.5= Fr/500N
Fr= 500N×0.5 = 250N
Fr= 250N
What Lags harder than my Nokia
my brain.
Explanation:
...................
Answer:The Nokia XR20. ... HMD Global said the Nokia XR20 is the most durable phone it's created to date. The XR20 sports a tough 6.67-inch Gorilla Glass Victus display from American tech firm Corning and can resist damage from scratches and drops from about 6 feet, the company says.Jul 26, 2021
Explanation:
Equation of Exclusive OR gate
Garade10
if a velocity time graph is hortizontal then velocity is
Answer: If a velocity time graph is horizontal then the velocity is constant and there is no acceleration.
explain hydraulic car jack with diagram
Answer:
what diagram
Explanation:
Physics acceleration
A force of 360 N [East] was applied by a student on a box with a mass of 50 kg.
What is the acceleration of the box if a frictional force of 340 N acts in the
opposite direction?
F = F⁰ - Ff
F = 360 N - 340 N
F = 20 N
F = m × a
20 N = 50 kg × a
a = 20 N / 50 kg
a = 0.4 m/s²
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The acceleration of the box when the frictional force of 340 N is applied to the box will be 0.4 m/s².
What is acceleration?In mechanics, acceleration is the measure of how quickly the velocity of an object changes with respect to time. The magnitude of accelerations as a vector. The acceleration of an object depends on the direction of the net force acting on it.
It is a vector quantity because acceleration has both a magnitude and a direction. Additionally, velocity is a vector quantity. The change in the vector of velocity during a period of time divided by the period of time is the definition of acceleration.
According to the question,
F = F⁰ - [tex]F_f[/tex]
F = 360 N - 340 N
F = 20 N
Force = m × a
20 N = 50 × a
a = 20 N / 50 kg
a = 0.4 m/s²
So, the acceleration of the box will be 0.4 m/s².
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A wave has a wavelength of 1.2 m and a frequency of 3 Hz. What is the wave
speed?
A. 4.2 m/s
B. 2.5 m/s
C. 1.8 m/s
D. 3.6 m/s
Answer:
D. 3.6m/s
Explanation:
The equation for wave speed can be used to calculate the speed of a wave when both wavelength and wave frequency are known. Consider an ocean wave with a wavelength of 1.2 meters and a frequency of 3 hertz. The speed of the wave is: Speed = 1.2m x 3wave/s = 3.6 m/s
find an expression for the magnitude of the horizontal force f in the figure for which m1 does not slip either up or down along the wedge. all surfaces are frictionless.
We have that the expression for the magnitude of the horizontal force F is
[tex]F=(m_1+m_2)gtan\phi[/tex]
From the question we are told
find an expression for the magnitude of the horizontal force f in the figure for which m1 does not slip either up or down along the wedge. all surfaces are friction-less.
Generally the equation for Normal force is mathematically given as
[tex]N=\frac{n_2g}{cos\pji}[/tex]
Where
a signifies acceleration
[tex]Nsin\phi=m_2a[/tex]
Therefore
Equating above equations
[tex]a=\frac{Nsin\phi}{m^2}\\\\a=gtan\ph[/tex]i
Generally the equation for Force on wedge is mathematically given as
[tex]F=m_1a+Nsin\phi[/tex]
[tex]F=(m_1+m_2)gtan\phi[/tex]
Therefore
The expression for the magnitude of the horizontal force F is
[tex]F=(m_1+m_2)gtan\phi[/tex]
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imagine your self as a basketball player.
Answer:
yap
Explanation:
so easy
thanks for free
If I imagine to be a basketball player than I fell too proud on myself...
. A car starts to move from rest. If its velocity becomes 90km/hr after 3s, calculate its acceleration
Answer:
32.5/s squared
Explanation:
proposed amendment on no more federal income tax
Placed on the number line, is 1/7 closer to 0, 1/2 or 1?
Answer:
0 as 1/7 = 0.142857143
1/7 = 5/35
We can get this number by 1/7 x 1000 = 1000 / 7
= 142.857143
Then move 3 decimal place.
The brakes are slammed on a speeding truck and it skids to a stop. If the truck were heavily loaded so it had twice the total mass, the skidding distance would be...
A) the same
B) one and one-half times as far
C) twice as far
D) four times as far
Explain your answer
Answer:
twice more but I have to make it 20 characters so h8 how u doing I hear yelling outside my room and exstasional dread in my head
If the mass of the truck is doubled, the force of friction is doubled, and the skidding distance is doubled.
Hence, the correct option is C.
The skidding distance is proportional to the mass of the truck. If the truck is heavily loaded so it has twice the total mass, the skidding distance will be twice as far.
This is because the force of friction is proportional to the normal force, which is in turn proportional to the mass of the truck. The greater the mass of the truck, the greater the force of friction, and the longer the skidding distance.
In equation form, the skidding distance is given by:
s = μ * d / f
where:
s is the skidding distance
μ is the coefficient of friction
d is the distance traveled before the truck stops
f is the force of friction
The force of friction is given by:
f = μ * mg
where:
m is the mass of the truck
g is the acceleration due to gravity
Therefore, If the mass of the truck is doubled, the force of friction is doubled, and the skidding distance is doubled.
Hence, the correct option is C.
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What is the mass for both??
Answer:
ligma
Explanation:
sugondese
what is the average acceleration of a car that is initially at rest at a stop light and then accelerates to 24 m/s in 9.4 s?
Answer:
Below
Explanation:
To find the acceleration of the car you can use this formula :
vf = vi + at OR a = v/t
I'm going to use the first one because it explains the steps more clearly :
vf = 24 m/s
vi = 0 m/s
t = 9.4 s
a = ?
24m/s = 0 + (a)(9.4s)
24m/s = a9.4
Divide both sides by 9.4
a = 2.55319 m/s^2
Round to 3 sig figs
a = 2.6 m/s^2
Hope this helps! Best of luck <3
what type of energy results from the position of an object?
Answer:
Explanation:
Some objects have energy as a result of their shapes or positions. Energy that results from the position or shape of an object is called potential energy. Gravitational Potential Energy – potential energy related to an object's height.
A 4.5 kg box is being pulled by a girl using a string that makes an angle of 20° horizontal. Find the force of friction if the force exerted on the string is 15 N and the coefficient of friction is 0.5.
Answer:
Fcoso-f =ma. F= ma 15 = 4.5 a then get acceleration. Fcoso- umg = ma then get friction
Một đoạn mạch gồm R1=8 ôm;R2=12 ôm.biết R1 nối tiếp với đoạn mạch gồm R2 song song với R3; R3=1/2 R2 cường độ dòng điện chạy qua mặt chính là 2A
a. Hãy vẽ sơ đồ mạch điện trên
b. Tính điện trở tương đương toàn mạch
c. tính cường độ dòng điện qua mỗi điện trở
Answer:
Explanation:
a.
b. R3= 1/2R2=6 ôm
R12= R1+R2=20 ôm
Rtđ=R12.R3/R12+R3= 4,62 ôm
c. U= I.Rtđ = 2.4,62=9,23 V
I1=I2= 9,23/20= 0,4615 A
I3= 2-0,4615=1,5385 A
which situation is an example of transferring heat by means of convection?
A situation that involves the transfer of heat by means of convection must involve the exchange of fluid currents such as land and sea breezes.
Heat transfer by convection is a method of heat transfer by which heat is transferred between two bodies through through currents of moving fluids or gases.
The following are examples of heat transfer by convection;
land breezes cooling the sea at nightsea breezes cooling the land during the dayboiling of watercirculation of blood, etcThus, a situation that involves the transfer of heat by means of convection must involve the exchange of fluid currents such as land and sea breezes.
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which plane divides the body into right and left halves
NEED HELP!!!!! 12 POINTS!!!!
If there are two objects of equal size but object A is heavier than object B, which statement is TRUE according to Newton’s second law of physics?
OPTIONS:
A.
Object A will require less force to be set in motion and will travel faster.
B.
Object B will require less force to be set in motion and will travel faster.
C.
Object A will require more force to be set in motion but will travel faster than object B.
D.
Object B will require more force to be set in motion but will travel faster than object A.
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Pete is driving down 7th street . He drives 150 meters in 18 seconds. Assuming he does not speed up or slow down, what is his speed in km per minute
Answer:
His speed is 8.333 m/s.
Explanation: