what is required to cause a body of mass 500g to accelerate uniformly from rest across a smooth horizontal surface so that it will cover a distance of 20 tometre in 4 seconds .
A constant force of 1.25N
Explanation:
This is a kinematics problem.
First find acceleration,
then use F = ma to find force.
Given:
mass = .5kg
delta x = 20m
t = 4s
a = ?
Friction = 0
From the kinematics equations:
delta x = Vi + (1/2)at^2
Plug in terms that are given:
20m = 0 + (1/2)a(4^2)
(2*20m)/(16s^2) = a
40m/(16s^2)= 2.5m/s^2
Now use F = ma to find force exerted on object.
F = (0.5kg)*(2.5m/s^2)
F = 1.25N
Which two statements best explains how observations of the spectra of light from galaxies are used to support current theories of the origin and evolution of the universe?
A: Galaxies that are further away tend to have larger redshifts
B: the blueshift observed from distant galaxies indicate that galaxies remain stationary relative to earth
C: the redshift observed from nearby galaxies indicates that most galaxies remain stationary relative to earth
D: the blueshift observed from nearby galaxies indicates that the solar system is orbiting a black hole
E: the redshift observed from distant galaxies indicates that they are moving away faster than nearby galaxies
Describe how an electromagnet can make a motor run.
What kind of energy involves the flow of positive charges?
thermal
radiant
electrical
nuclear
Answer:
Electrical
Explanation:
Electrical would be the energy that involves the flow of positive charges.
Which type of reproduction takes a great deal of energy?
Asexual
Sexual
Answer:
Sexual
Explanation:
Sexual reproduction takes more energy and time. Since you know it requires two people of opposite sexes to "do it".
How many meters in 37 kilometers? If there are 1,000 meters in one kilometer
Answer:37000
Explanation:
37 x 1000= 37000
Which formula represents the law of conservation of energy?
Answer:
KE+PE
Explanation:
A 0.40 kg soccer ball has 20 J of kinetic energy. How fast is it moving?
A sound wave travels from air into a swimming pool. How does its speed
change?
Answer:
It is b
Explanation:
What's Inertia ????☁️☁️
Explanation:
the inability to change the position from rest to motion or motion to rest by themselves is inertia.
Answer:
Inertia is the property of a body in rest to resist motion or a body in motion to continue to its state of motion unless acted by external forces.
PLEASE HELP!! THIS IS DUE TODAY!
explain how the path of light changes as it moves from the oil to the water
William drew a diagram of a box containing a gas for his science project. His drawing is shown.
True or false:
1.Gravity is the weakest universal force, but it is the most effective over long distances.
True or false:
2.An artificial satellite in a low orbit will slow down and lose altitude due to the pull of Earth's gravity.
True or false:
3.Electromagnetic force is associated with charged particles.
Why do Tectonic Plates move?
A) convection currents in the atmosphere
B) convection currents in the crust
C) convection currents in the asthenosphere
D) Convection currents in the core
Answer:
c. convection currents in the asthenosphere
Explanation:
A 720 N box is pushed by a mover 60 meters in 30 seconds. How much work is done?
Answer:
The work done will be "43,200 J".
Explanation:
The given values are:
Force,
F = 720 N
Distance,
S = 60 m
Time,
t = 30 sec
As we know,
⇒ [tex]Work \ done=Force\times Distance[/tex]
On substituting the values, we get
⇒ [tex]=720\times 60[/tex]
⇒ [tex]=43,200 \ J[/tex]
A 75.0 kg driver slides into a seat in a truck that has only 1 spring. The spring compresses 1.60 cm = 0.0160 m. What is the spring constant of the spring in the seat?
Answer
0.510
Explanation:
plzzzz help I need help
Answer:
1. It will never run out
2. It’s better for the eviroment
Explanation:
1. Coal is not a renewable source and take along time for it to form so it will soon run out
2. Burning coal releases fossil fums into the air affecting the ozone layer but using solar power dose not release anything into the air
Answer:
Renewable energy works as clean sources of energy, and don't make as much of a detrimental impact on the environment as non-renewable energy. Air pollutants are a product of some non-renewable sources, and it negatively affects the atmosphere, humans, animals, and oceans.
Also, renewable sources won't run out, unlike other sources, as they are finite and will not last forever.
I hope this helped!
The temperature inside a Carnot refrigerator placed in a kitchen at 22 degree Celcius is 2 degree Celcius. The heat extracted from the refrigerator is 89 MJ/h. What power is needed to operate this refrigerator?
Answer: 1.79 kW
Explanation:
Given
The temperature of the refrigerator is [tex]T_L=2^{\circ}C\approx 275\ K[/tex]
The temperature of the kitchen is [tex]T_H=22^{\circ}C[/tex]
COP of the refrigerator is
[tex]COP=\dfrac{T_L}{T_H-T_L}=\dfrac{\text{Desired effect}}{\text{Power}}\\\\\Rightarrow COP=\dfrac{275}{22-2}=\dfrac{89}{P}\\\\\Rightarrow P=\dfrac{20}{275}\times 89=6.47\ MJ/h\ \text{or}\ 1.79\ kW[/tex]
What happens when cooler downdrafts inside a supercell move across the edge of an upward moving mesocyclone?
A. A supercell
B. A me so cyclone
C. A tornado
D. A hurricane
Four satellites are in orbit around the Earth. The heights and the masses of
the four satellites are given in the table. For which satellite is the gravitational
pull of Earth the strongest?F= Gm1m2/r^2
A. Satellite A
B. Satellite B
C. Satellite C
D. Satellite D
Answer:
satellite B
Explanation:
A .F= G (mM)/r²
B .F= G (2mM)/r² = 2G (Mm)r²
C .F= G (3mM)/(2r)² = ¾G (mM)/r²
D .F= G (4mM)/(2r)² = G (mM)/r²
(b) The difference h between the two liquid levels is 2.0 cm. The density of the
liquid is 800 kg /m3.
Calculate the difference between the pressure of the gas and atmospheric
pressure.
.[2]
pressure difference
Answer:
101201.2 Pascal.
Explanation:
Given that the difference h between the two liquid levels is 2.0 cm. The density of the liquid is 800 kg /m3.
Calculate the difference between the pressure of the gas and atmospheric
pressure.
The pressure of the gas can be calculated by using the formula
Pressure = density × acceleration due to gravity × height
Substitute all the parameters into the formula
Pressure = 800 × 2/100 × 9.8
Note that the height is converted to metre.
Pressure = 156.8 Pascal
pressure difference = 101358 - 156.8
Pressure difference = 101201.2 Pascal
What is the most likely evidence of an energy transformation taking place when a wire that is twisted and turned breaks? (5 points)
Reddish glow is emitted as kinetic energy is transformed into thermal energy
Reddish glow is emitted as kinetic energy is transformed into electrical energy
Broken end of the wire turns hot as kinetic energy is transformed into thermal energy
Broken end of the wire turns hot as kinetic energy is transformed into electrical energy
Answer:
C
Explanation:
If the maximum moment of force on a door is 10 Nm by an applied force of 2.25 N, then the distance of handle
Answer:
d = 4.44 m
Explanation:
Given that,
The moment of force on a door = 10 N-m
The applied force, F = 2.25 N
We need to find the distance of the handle. The moment of force is given by :
[tex]\tau=F\times r[/tex]
Where
r is the distance of the handle.
[tex]r=\dfrac{\tau}{F}\\\\r=\dfrac{10}{2.25}\\\\r=4.44\ m[/tex]
So, the required distance is equal to 4.44 m.
___occurs whenever electrons within a neutral
object move because of the electric field of a nearby charged
object
Answer:
The answer is Polarization
Even though we have managed to vastly improve on flight since the early 1900's, engineers still work to
improve upon air travel. One of the best ways to engineer a new design for a particular product would be
to
Answer:
C. for sure
Explanation:
usatestprep
What is the frequency of a light with the wavelength of 5.00 x 102 m?
Answer:
510 meters
Explanation:
That is sort of a math question but with the meters and wavelength, it's both a physical and a math question. Don't worry, i won't report (Unless you report my answer)
How does the total mass before a nuclear reaction compare with the total mass after
a nuclear reaction? How does Einstein's equation address this difference?
Una reacción química, también llamada cambio químico o fenómeno químico, es todo proceso termodinámico en el cual dos o más especies químicas o sustancias (llamadas reactantes o reactivos), se transforman, cambiando su estructura molecular y sus enlaces, en otras sustancias llamadas productos.
Answer: A chemical reaction, also called chemical change or chemical phenomenon, is any thermodynamic process in which two or more chemical species or substances (called reactants or reactants), are transformed, changing their molecular structure and their bonds, into other substances called products.
Explanation:
what does point c represent
Explanation:
point c is minimum Amplitude in transversal wave
Someone help me & extra pointsss!
Answer:
117.43 m
Explanation:
Eg=mgh=13x9.81xh=127.53h(N)
Ek=0.5mv^2=0.5(13)(48)^2=14,976 N
by conservation of potenial energy:
Ei=Ef
127.53h=14976
h=117.43m
Mercury is a very small planet, with a surface that is exposed directly to space. This is because the planet has practically no
atmosphere. Normally, no atmosphere would mean very cold, but it is very hot on Mercury. Why?
The surface of Mercury looks much like Earth's moon. ... On its dark side, Mercury gets very cold because it has almost no atmosphere to hold in heat and keep the surface warm. The temperature can drop down to minus 300 degrees Fahrenheit. Sunlight never reaches into the bottoms of some craters near Mercury's poles.
Answer: B
Because Mercury is the closest planet to the sun
Explanation:
Hope this helps