Describe the energy of the skier at location W.*
At point W, potential energy is greatest and kinetic energy is least.
At point W, potential energy is least and kinetic energy is greatest.
At point W, potential energy and kinetic energy are the same.
Answer:
The description of the energy of the skier at point W is,
At point W, potential energy is greatest and kinetic energy is least
Explanation:
The given parameters are;
The highest point of the skier's path = Point W
The lowest point of the skier's path = Point X
The height of the peak after point X = Intermediate between point W and point X
The potential energy of the skier, P.E. = m·g·h
The kinetic energy of the skier, K.E. = 1/2·m·v²
The total mechanical energy of the skier, M.E. = P.E. + K.E.= Constant
Where;
m = The mass of the skier
g = The acceleration due to gravity = 9.8 m/s²
h = The height of the skier
v = The velocity of the skier
Therefore, the P.E. of the skier is highest at the highest point of the skier's path which is the point W, where h = Maximum
Similarly, the potential energy of the skier will be lowest at point X which is the lowest point on the skier's path
From P.E. + K.E. = constant, the kinetic energy will be least at point W, where the potential energy is highest.
Therefore, the description of the energy of the skier at point W is that the potential energy is greatest and kinetic energy is least.
Which model shows how an image appears to a person when they look through a concave lens?
If an electric circuit has 0 A of current running through it, then the
must be
Answer:
Voltage, Zero
Explanation:
If an electric circuit has 0 A of current running through it, then the ✔ voltage must be ✔ zero.
Answer:
Voltage, zero
Explanation:
Which of the following is not a benefit of being multicellular?
we can't see multicellular animal with our naked eyes
Will MARK BRAINLIST a only for correct answer
I need help ASAP
Thanks + BRAINLIST
Which of the following is true for sound waves?
-They require a medium
-They are unrelated to vibrations.
-They can travel in a vacuum
-They cannot travel through liquids
-None of the above
Answer:
Explanation:
They require a medium.
If you found my answer useful then please mark me brainliest.
Answer:
- They require a medium
Explanation:
Sound waves are, by definition, waves of vibrating matter. You need a medium like a solid, liquid or gas to transmit sound waves. A vacuum is space without matter, and so sound cannot be transmitted through it. Outer space is, for the most part, a vacuum, so that line from Alien rings pretty true:
"In space, no one can hear you scream."
the question is in the photo. please help
Answer:
Its B for your question
Explanation:
its B hope it helps
awnser:
C
Explanation:
An object accelerates in the same direction as that of force applied
A construction crane, like the one shown, has a power output of 1,500 watts. If it takes 200 seconds to lift the roof to the top of the building, how much energy will the crane use
Answer:7.5j
Explanation:
P=w/s
A 195 g glider is moving at 5.3 m/s on a frictionless air track. It then collides with a stationary 295 g glider.
What would be the velocity after the collision of the gliders if the collision was inelastic? (2.11 m/s)
Answer:For a perfectly elastic collision, the final velocities of the carts will each be 1/2 the velocity of the initial velocity of the moving cart. For a perfectly inelastic collision, the final velocity of the cart system will be 1/2 the initial velocity of the moving cart.
Explanation:
A 20-kilogram child is riding on a 10-kg sled over a frictionless icy surface at 8.0 meters per second. Calculate the kinetic energy of the sled with the child.
Answer:
K = 960 J
Explanation:
Given that,
Mass of a child = 20 kg
Mass of a sled = 10 kg
Speed of child on sled = 8 m/s
We need to find the kinetic energy of the sled with the child.
The total mass of child and the sled = 20 kg + 10 kg
= 30 kg
The formula for the kinetic energy of an object is given by :
[tex]K=\dfrac{1}{2}mv^2\\\\K=\dfrac{1}{2}\times 30\times (8)^2\\\\K=960\ J[/tex]
Hence, the kinetic energy of the sled with the child is 960 J.
PLEASEE HELP ASAP !!!!! thank you so so so much!!!! *will give brainliest*
Answer:
Answer a) Force on A equal to force on B
Answer a) The electric field points to the left in the location A
Explanation:
12)
Recall that the magnitude of the electrostatic force is given by:
[tex]F=k\frac{q*Q}{d^2}[/tex]
therefore in magnitude it is the same for charge q than for charge Q.
(Answer a for the first problem - 12)
13)
Recall that the electric filed points outwards for a positive charge, therefore at the location of charge q, the field must be pointing towards the left.
Which two figures are used to
determine the average speed?
Sergei uses a lever to lift a heavy rock. He obtains a 2.5m lever and places the fulcrum 0.7m from the rock. What is the ideal mechanical advantage of Sergei's lever?
Answer:
m = 3.57
Explanation:
Given that,
Sergei uses a lever to lift a heavy rock. He obtains a 2.5m lever and places the fulcrum 0.7m from the rock.
We need to find the ideal mechanical advantage of Sergei's lever.
It is equal to the ratio of resistance arm to the effort arm. In terms of length it is given by :
[tex]m=\dfrac{d_2}{d_1}\\\\m=\dfrac{2.5}{0.7}\\\\=3.57[/tex]
So, the ideal mechanical advantage of the lever is 3.57.
You have a bottle of 1.7 Liters of happy water but no scale . Calculate the mass of the water. show units. "happy water" has a density of 1.1 g/cm^3
Im just putting questions from my friends quiz on here to see if u guys know
Answer:
1kg/ L
Explanation:
An example of a unicellular organism includes all of the following except what?
Answer:
Amoeba, paramecium, euglena are the examples of unicellular organism
Explanation:
Hope you like my answer
In a balanced equation, the total number of atoms of each element on the reactant side is _ total number of atoms on the product side
Explanation:
In a balanced equation, the total number of atoms of each element on the reactant side is equal total number of atoms on the product side
What are the two most abundant elements in a main
sequence star?
A) carbon and hydrogen
B) hydrogen and helium
C) helium and carbon
D) carbon and heavy metals
Answer:
B
Explanation:
The two most abundant elements in a main sequence star are the hydrogen and helium. Thus, the correct option is B.
What is the main Sequence star?The main sequence is a continuous and distinctive band of the stars which appears on the plots of stellar color versus the brightness. These color-magnitude plots are known as the Hertzsprung–Russell diagrams, named after their co-developers, Ejnar Hertzsprung and Henry Norris Russell. The stars on this band are known as the main-sequence stars or the dwarf stars. These are the most numerous true stars present in the universe and include the Sun.
Hydrogen is the most abundant element which is possessed by the main sequence star. After hydrogen atom, the most abundant element which is found is helium. This gets accumulated in the star's core through the process of nuclear fusion.
Therefore, the correct option is B.
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How long will it take, in minutes, for a transformer to transfer 2.3 X 10^6 J of energy from a 120-V circuit to a 345-V circuit with a current of 1.5 A?
Answer:
e
Explanation:
It will take 74.07 minutes, for a transformer to transfer 2.3 X 10^6 J of energy from a 120-V circuit to a 345-V circuit with a current of 1.5 A
What is power?The rate of doing work is known as power. The Si unit of power is the watt.
Power =work/time
The mathematical expression for the power is as follows
P = VI
where P is the power
V is the voltage
I is current passing through the circuit
For a transformer to transfer 2.3 X 10^6 J of energy from a 120-V circuit to a 345-V circuit with a current of 1.5 A
Power on the delivery side of the transformer by using the above formula
P = VI
P= 345 V × 1.5 A
P= 517.5 watt
Power = electrical energy /time
517.5 watt = 2.3 X 10^6 J / time
time = 4444.44 seconds
=74.07 minutes
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PLS ANSWER WITH EXPLANATION OR SOLUTION (WILL GIVE 50 PTS)
An aircraft carries a static charge of 0.75 C. It travels at 235 m/s perpendicular to a
1.9
×
10
−
4
T magnetic field. What magnetic force does an aircraft experience?
Answer:
[tex] \underline{ \boxed{F_m = 3.35 { \times 10}^{ - 2} N}}[/tex]
Explanation:
[tex]since \: in \: this \: case \to \: \underline{ v }\: is \perp \: to \:\underline{ q} \\ then \: the \: magnetic \: force \: (F_m) \: is \: max = qvB \sin(90) \\ F_m = qvB \times (1) = qvB \\ hence \to \\ F_m = qvB \\ where \\ \: q = 0.75 C : v = 235m {s}^{ - 1} : B = 1.9 { \times 10}^{ - 4} T \\ therefore \to \\ F_m = 0.75 \times 235 \times 1.9 { \times 10}^{ - 4} \\ F_m = 176.25 \times 1.9 { \times 10}^{ - 4} \\ F_m = 0.0334875 = 3.35 { \times 10}^{ - 2} N \\ \boxed{F_m = 3.35 { \times 10}^{ - 2} N}[/tex]
Which of Galileo’s discoveries were later used in Newton’s laws?
Select all that apply.
a moving object will keep moving if not stopped
the effect of gravity on different objects
the phases of the moons of Jupiter
the Sun being at the center of the Solar System
please help..
Answer:
a moving object will keep moving if not stopped
the sun being at the center of the solar system
Explanation:
Galileo is known for being the first person make a telescope, there fore being the first person to see that the sun is in the center of the solar system. he also came up with the theory that if something is pushed, it would keep moving until stopped by another force. For example, say you drop your pencil, it keeps falling until it hits the ground. That is exactly what Galileo did in his Leaning Tower of Pisa experiment and found that theory to be true.
Galileo’s discoveries were later used in Newton’s laws include the following
below:
A moving object will keep moving if not stoppedThe sun being at the center of the solar systemGalileo was a scientist which invented the telescope and used it to view the
center position of the Sun in the solar system.
He also proposed that if something is pushed, it would keep moving until
stopped by another opposing force. His discoveries were found to be true
and were later used in Newton’s laws.
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Why does the Moon orbit Earth?
a
There is magnetic attraction between the Earth and
the Moon
b
There is gravitational attraction between the Earth
and the Moon
с
There is chemical attraction between the Earth and
the Moon
d
There is mechanical attraction between the Earth
and the Moon
Answer:
B
Explanation:
Gravity, the attractive force between all masses, is what keeps the planets in orbit. Newton’s universal law of gravitation relates the gravitational force to mass and distance
The force of gravity is what gives us our sense of weight. Unlike mass, which is constant, weight can vary depending on the force of gravity (or acceleration) you feel. When Kepler’s laws are reexamined in the light of Newton’s gravitational law, it becomes clear that the masses of both objects are important for the third law, which becomes a3 = (M1+ M2) × P2. Mutual gravitational effects permit us to calculate the masses of astronomical objects, from comets to galaxies.
A student is creating a table with properties of electromagnetic and mechanical waves.
Answer:
The property of the wave marked X is related to the source of the wave
Explanation:
The source of of origin of waves
Electromagnetic wave are waves that consists of varying electric and magnetic field that vibrate perpendicular to each other and to the direction of propagation of the wave and they are therefore transverse waves and transfer energy
Electromagnetic waves originate from the vibration of charged particles that gives off varying electric and magnetic fields
Mechanical waves are defined as waves that require a material medium such as air, water, metal, plastic, stretched leather, or wood to propagate
Mechanical waves originate from vibration of the particles of a medium
Sound waves which is a form of longitudinal mechanical waves that propagates by the vibration of the particles of a given medium about a point parallel to the direction of propagation of the wave.
A sample of an unknown metal has a mass of 0.5 kg. Adding 1985 J of heat to the metal raises its temperature by 10 K. What is the specific heat of the metal
Answer:
Cp = 397 [J/kg*K]
Explanation:
By means of the energy equation for heat transfer in substances and objects, we can calculate the specific heat. In this way, we have the following equation.
[tex]Q=m*C_{p}*DT[/tex]
where:
Dt = temperature change = 10 [K]
m = mass = 0.5 [kg]
Q = heat = 1985 [J]
Cp = specific heat [J/kg*K]
Now replacing:
[tex]1985=0.5*C_{p}*10\\C_{p}=\frac{1985}{0.5*10}\\C_{p}=397[\frac{J}{kg*K} ][/tex]
How does the Doppler effect cause a siren's pitch to increase as it
approaches you?
A. Sound waves are spread out, increasing wavelength and
decreasing frequency.
B. Sound waves are pushed closer together, increasing wavelength
and decreasing frequency.
C. Sound waves are spread out, decreasing wavelength and
increasing frequency.
D. Sound waves are pushed closer together, decreasing wavelength
and increasing frequency.
When a car sounds its horn as it approaches and moves away from an observer, there is a change in pitch known as a Doppler shift. During the approach, the received frequency is higher than the emitted frequency. ]Thus, option B is correct.
What Doppler effect cause a siren's pitch to increase?You hear a fairly high-pitched sound, like an ambulance coming at you with sirens blazing. This is because the moving ambulance is squishing the sound waves in front of the car together.
A good illustration of the Doppler effect is this. Since the effective wavelength is reduced due to an approaching source moving closer throughout the sound wave's period while the wave's velocity remains constant, the pitch is increased. Similar to this, a sound source that is fading away will have a lower pitch.
Therefore, Sound waves are pushed closer together, increasing wavelength and decreasing frequency.
Learn more about Doppler effect here:
Answer:B
Explanation:
If you act without reason or sound judgement, people will describe you as __________.
a
impressionable
b
irrational
c
inconsistent
d
inconsiderate
Answer:
irrational
Explanation:
A 900 kg vehicle moves around a curve with an incline of 20\circ∘ at a speed of 12.5 m/s. If the curve has a radius of 50 meters, what normal force [N] will the vehicle experience?
IN NEWTONS
Answer:
The normal force experienced by the car is approximately 8223.2 N
Explanation:
The question relates to banking of road where the centripetal force for the circular motion of the vehicle is provided by the horizontal component of the normal reaction
The mass of the vehicle that moves around the curve, m = 900 kg
The incline of the curve, θ = 20°
The speed with which the vehicle moves around the curve, v = 12.5 m/s
The radius of the curve, R = 50 meters
We have;
[tex]N \cdot sin(\theta) = \dfrac{m \cdot v^2}{R}[/tex]
Where;
θ = The angle of inclination of the road = 20°
N = The normal force experienced by the car
m = The mass of the car = 900 kg
v = The velocity with which the car is moving = 12.5 m/s
R = The radius of the curve around which the vehicle moves = 50 m
[tex]\therefore N = \dfrac{m \cdot v^2}{R \cdot sin(\theta)} = \dfrac{900 \times (12.5)^2}{50 \times sin(20^{\circ})} = 8223.1998754586828969046217875927[/tex]
The normal force experienced by the car = N ≈ 8223.2 N.
How many grams of sugar are in 0.5mol C6H12O6?
Answer:
90.07794 grams
Explanation:
!!!HELP ASAP!!!
in witch situation is work being done?
theres a photo added.
1. List a similarity between magnetic force and electrical force.
Answer:
Both are attractive as well as repulsive.
Explanation:
(Like poles repel, like charges repel; unlike poles attract, unlike charges attract).
There are two types of charges that form electric fields: positive and negative charges. Magnetic fields are formed by charges and are related with two magnetic poles, north and south (but moving charges).
The attraction and repulsion of electric charges produce both electric and magnetic fields.
The force released by magnets when they attract or repel each other is known as magnetism. An electric force is the attracting or repulsive interaction between any two charged things.
Similarities are as follows:
There are two types of charges that form electric fields: positive and negative charges. Magnetic fields are formed by charges and are related with two magnetic poles, north and south (but moving charges).The attraction and repulsion of electric charges produce both electric and magnetic fields.For more information:
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Planet X has twice earths mass and three times earths radius. The magnitude of the gravitational field near planet X’s surface is most nearly.
Answer:
2 N/kg
- The explanation for it is quite complicated, especially to type it out but I hope this helps.
The magnitude of the gravitational field should be 2 N/kg.
Calculation of the magnitude of the gravitational field:Since Planet X has twice earths mass and three times earths radius.
So,
we know that
[tex]g = GM\div r^2[/tex]
here, G = gravitational constant
M = mass of the planet
r = radius of the planet
So,
[tex]g\div gx = (M1\div M2) \times (r2\div r1) ^{2}\\\\9.8\div gx = (1\div 2) \times (3\div 1) ^2\\\\gx = 2.18 m/s^2[/tex]
So it is nearly 2 N/kg
hence, The magnitude of the gravitational field should be 2 N/kg.
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. A car with a mass of 700-kg changes its speed from 10.0 m/s to 30.0 m/s in a displacement of 50.0 meters. Calculate the net force acting on the car during this time.
Answer:
5600N
Explanation:
Given parameters:
Mass of car = 700kg
Initial velocity = 10m/s
Final velocity = 30m/s
Displacement = 50m
Unknown:
Net force acting on the car = ?
Solution:
To find the force acting on a body, it is pertinent we know the mass and acceleration.
Force = mass x acceleration
Now;
Let us find the acceleration from the kinematics equations:
v² = u² + 2aS
v is the final velocity
u is the initial velocity
a is the acceleration
S is the distance
30² = 10² + (2 x a x 50)
900 = 100 + 100a
100a = 800
a = 8m/s²
Therefore;
Force = 700 x 8 = 5600N
