An ice skater weighs 500 [N]. He is coasting to the right at a constant velocity of 2 [m/s]. Assume
the ice is frictionless.
What is the net force on the skater?
Answers
Answer:
The net force on the skater is zero. (\(F_{net} = 0\,N\))
Explanation:
According to Newton's First Law, an object is at equilibrium when either it is at rest or moves at constant velocity, which means a net force of zero. Based on the given statement, there are no external forces acting on skate and, therefore, the net force on the skater is zero. (\(F_{net} = 0\,N\))
Related Questions
A 2-kg mass placed 30-cm to the left of the fulcrum is balanced by a 2-kg mass placed ______ cm to the right of the fulcrum.
Answers
Answer:
30 cm
Explanation:
0.06 or \(\frac{1}{15}\)
What is the effort and load arm?The lever has two “arms”:
The load arm is the portion of the lever directly connected to the load.
The effort arm is the portion of the lever to which we apply the effort, or input force.
The formula of the mechanical advantage(MA) of a lever is given as
MA = load/effort.
Given,
load = 2kg , effort = 30cm
MA = \(\frac{2}{30}\) = \(\frac{1}{15}\)
MA = 0.06 cm
Therefore,
A 2-kg mass placed 30-cm to the left of the fulcrum is balanced by a 2-kg mass placed 0.06 cm to the right of the fulcrum.
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why does conductivity increase after equivalence point
Answers
a car takes 125 ft to brake from 60 to 0 mph. Assume that the acceleration of the Prius is constant while braking. Find how long it takes for the Prius to come to a stop. Long problems begin on the next page
Answers
Answer:
2.84 seconds
Explanation:
t = ?
distance = 125
Velocity origianal = 60 m/hr = 88 ft/s
AVERAGE velocity = 88/2 = 44 ft/s
44 t = 125
t = 125/44 = 2.84 s
The Velocity V of Sound travelling along a road made of a material of young's modulus and density f is given by V=
\( \sqrt{} \)
r÷q
show that the formula is dimensionally Consistent.
Answers
The formula is dimensionally consistent, the unit of both sides is m/s.
What is the prove for dimension consistency?To show that the formula is dimensionally consistent, we need to check that the units of each term on both sides of the equation are the same.
V= √(r÷q)
From the LHS,
V = velocity of sound
The units of velocity is meters per second (m/s).
Moving on to the right-hand side (RHS) of the equation:
√(r÷q)
r = Young's modulus
The units of Young's modulus are force/area, = Pascals (Pa).
q = density
The units of density is kg/m³
So, the units of the RHS can be simplified as follows:
√(r÷q) = √(Pa/(kg/m³)) = √(kg/m/s²) = m/s
Therefore, the units on both sides of the equation are the same (m/s), indicating that the formula is dimensionally consistent.
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“You can’t get more energy from a machine than the amount of energy you put into it,” is one way of stating the law of conservation of _____. A. work B. friction C. energy D. power
Answers
Answer:
Energy
Explanation:
One ways of stating the law of conservation of energy is that "you cannot get more energy from a machine than the amount of energy you put into it".
The law of conservation of energy states that in a system, energy is neither created nor destroyed but transformed from one form to another.
The energy in a system does not increase based on the premise of this law.
The efficiency of a machine can reduce but the energy is always conserved. This is because energy is transformed to other forms.A figure skater begins spinning counterclockwise
Answers
A counterclockwise spin in figure skating is known as a "backspin" or "backward spin."
Is the figure skater able to maintain control during the spin?It isn't always special whether the figure skater is capable of keep control for the duration of the spin. It'd depend upon the skater's skill stage and the precise conditions of the spin. Factors inclusive of the skater's balance, pace, and technique can all play a function in figuring out if they're able to keep manage. Moreover, the surface of the ice and any distractions within the environment might also affect the skater's ability to maintain manipulate. Average, the capacity to keep manipulate in the course of a spin can range significantly depending at the individual skater and the unique situations of the spin.
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Helpppppppppppppppppppppppppppopppppppppp
Answers
Answer:
I think it's 2 the photo is hard to tell what they are exactly talking about.
which of these correctly compares the masses of different objects in the universe?
Answers
A moon has more mass than the planet it circles and less mass than a star.
Do planets have a greater mass than stars?
By this definition, "stars" must be larger than planets in terms of mass. The size of a white dwarf would be comparable to that of a moon or small planet, but its mass would be approximately 200–1300 times that of Jupiter. Even more extreme are neutron stars, which are about the size of an asteroid but have a mass of several thousand Jupiters.
Why is the weight of the same object different on different planets Class 7?
The weight of an object is determined by its mass and the gravitational force that it experiences. The separation between two objects affects how strong gravity is. Because of this, an object weights differently on many planets.
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|5x-8|+5=32 how would i set this problem up to solve
Answers
You have the following expression:
\(\lvert5x-8\rvert+5=32\)subtract 5 both sides of the equation:
\(\begin{gathered} \lvert5x-8\rvert=32-5 \\ \lvert5x-8\rvert=27 \end{gathered}\)Take into account that the absolute value of any number is equal to the same number but positive.
Then, you have:
\(5x-8=-27\)and
\(5x-8=27\)Then, solve the previous equations:
5x - 8 = -27 add 8 both sides
5x = -27 + 8
5x = -19 divide by 5
x = -19/5
5x - 8 = 27 add 8 both sides
5x = 27 + 8
5x = 32 divide by 5
x = 32/5
Then, the solutions of the given equations are:
x = -19/5
x = 32/5
Un tren emite un sonido a 480hz determina la frecuencia que percibe el observador cuando el observador se aleja a 12m/s del tren que ha quedado en reposo velocidad del sonido en el aire 340m/s
Answers
Answer:
La frecuencia que percibe el observador es 463 Hz.
Explanation:
El efecto Doppler se define como el cambio de frecuencia aparente de una onda producida por el movimiento relativo de la fuente respecto a su observador. En otras palabras, este efecto es el cambio en la frecuencia percibida de cualquier movimiento ondulatorio cuando el emisor y el receptor, u observador, se desplazan uno respecto a otro.
La siguiente expresión se considera el caso general del efecto Doppler:
\(f'=f*\frac{v+-vR}{v-+vE}\)
Donde:
f’, f: Frecuencia percibida por el receptor y frecuencia emitida por el emisor respectivamente. Su unidad de medida en el Sistema Internacional (S.I.) es el Hertz (Hz), que es la unidad inversa del segundo (1 Hz = 1 s-1) v: Velocidad de propagación de la onda en el medio. Es constante y depende de las características del medio. En este caso se considera que la velocidad del sonido en el aire es de 340 m/s vR, vE: Velocidad del receptor y del emisor respectivamente. Su unidad de medida en el S.I. es el m/s ±, ∓:Utilizaremos el signo +:
En el numerador si el receptor se acerca al emisor
En el denominador si el emisor se aleja del receptor
Utilizaremos el signo -:
En el numerador si el receptor se aleja del emisor
En el denominador si el emisor se acerca al receptor
En este caso:
f= 480 Hzv= 340 m/svR= 12 m/s (el receptor es el observador)vE=0 (el emisor es el tren, que se encuentra en reposo)Y como el receptor se aleja del emisor, la expresión del efecto Doppler queda determinada como:
\(f'=480 Hz*\frac{340 m/s-12 m/s}{340 m/s-+0 m/s}\)
Resolviendo se obtiene:
\(f'=480 Hz*\frac{340 m/s-12 m/s}{340 m/s}\)
\(f'=480 Hz*\frac{328 m/s}{340 m/s}\)
f'= 463 Hz
La frecuencia que percibe el observador es 463 Hz.
Which one is greater 2.62 , 2 2/5 , 26.8 , 2.26 , 271%.
Answers
In order to compare the numbers, let's put all of them into the decimal form:
\(\begin{gathered} 2.62 \\ \\ 2\frac{2}{5}=2+\frac{2}{5}=\frac{10}{5}+\frac{2}{5}=\frac{12}{5}=2.4 \\ \\ 26.8 \\ \\ 2.26 \\ \\ 271\text{\%}=\frac{271}{100}=2.71 \end{gathered}\)We can see that the greater one is 26.8 (all other numbers are close to 2, and this one is close to 27).
The numbers in decrescent order are:
26.8, 271%, 2.62, 2 2/5, 2.26.
Answer:
26.8
Explanation:
2.26 < 2.4 < 2.62 < 271/100 = 2.71 < 26.8
Which equation expresses the conservation of mechanical energy in a system where the only forms of mechanical energy are kinetic energy and elastic potential energy?
a.
1/2mvi2 + mghi = 1/2mvf2 + mghf
b.
1/2mvi2 + mghi + 1/2kxi2 = 1/2mvf2 + mghf + 1/2kxf2
c.
1/2mvi2 + 1/2kxi2 = 1/2mvf2 + 1/2kxf2
d.
mei = mef
Answers
c it hink this because im geuss
The diagram represents Earth's orbit around the Sun. Where is the Sun located in this ellipse?
A)
At the center
B)
At the periphery
At the epicenter
D)
At one of the two foci
Submit
Helpppppp
Answers
Answer:
Its a D.
Explanation:
An object starts from rest at point F and speeds up continuously as it moves around an oval. a. Choose a point about 1/8 th of the way around the oval from point F, and label it point G. Draw a vector to represent the velocity of the object at point G. b. Determine the change in velocity vector between points F and G.
Answers
Answer:
a) Check the file attached below for the diagram
b) Change in velocity vector between F and G, \(\overrightarrow{\triangle V} = \overrightarrow{V_G}\)
Explanation:
a) The diagram that represents the description is contained in the file attached to this solution. A vector, \(V_G\) that represents the velocity of the object at point G is also indicated.
A very good point to note is that the direction of the velocity is always acting tangent to the path
b) The change in velocity vector between F and G
The change in velocity vector is \(\overrightarrow{\triangle V} = \overrightarrow{V_G} - \overrightarrow{V_F}\)
Since the object starts from rest at point F, \(\overrightarrow{V_F} = 0\)
Therefore, Change in velocity vector between F and G, \(\overrightarrow{\triangle V} = \overrightarrow{V_G}\)
In order for an object to have a perfectly circular orbit, what one thing must occur?
An object must have the exact mass to orbit in a circle.
An object must have the exact speed to achieve the circular orbit.
An object must have enough speed to create escape velocity.
Answers
In order for an object to have a perfectly circular orbit, an object must have the exact speed to achieve the circular orbit.
What is a circular orbit?A circular orbit is a circular path which an object continuously follow in the course of its movement.
The earth and planets have a circular orbit around the sun.
The circular orbit is maintained by a balance between centripetal and centrifugal forces.
Therefore, in order for an object to have a perfectly circular orbit, an object must have the exact speed to achieve the circular orbit.
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The light ray is now incident on a glass-air interface, with an angle of incidence in the glass of 45 degrees. What is the angle of light ray emerging from the glass into air
Answers
The ray will not emerge into the air medium from glass medium.
To find the answer, we need to know about the critical angle.
What's critical angle of glass?Critical angle of a medium can be determined from the relation as sinФ = 1/n, n = refractive index of that medium.As glass has refractive index of 1.5, so Critical angle = sin⁻¹(1/1.5) = 42 °Why does the light incident at 45° inside a glass not emerge to the air medium?As we got the critical angle of glass is 42°, so the light incident at 45° which is greater than 42° will reflect back into the glass medium instead of emergence into the air medium.Thus, we can conclude that the light will not emerge into air medium.
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Two ice skaters on ice push away from each other. What will be the effect of the forces of their pushing each other if their masses are different?

Answers
Answer:If the masses are different, the lighter ice skater will accelerate faster than the ice skater with more mass.
Explanation:
The lighter skater will accelerate more quickly than the heavier skater if there are mass discrepancies.
used an idea?According to Newton's third law, the action and reaction forces in any force interaction must be equal and moving in the opposite directions. These pressures, nevertheless, affect a variety of items. In this case, each skater will experience the same amount of force, and if any other horizontal forces, such as friction, operating on each skater in the opposite direction from the pushing force are less than the pushing force, each will accelerate in that direction. The two skater system's center of mass will remain where it is if there is little to no friction to prevent the skaters from moving.
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A wire with a circular cross section and a resistance R is lengthened to 4.65 times its original length by pulling it through a small hole. The total volume of the wire is unchanged. Find the resistance of the wire after it is stretched. Answer in units of R.
Answers
The resistance of the wire after stretching is 21.6 times the original resistance (21.6R).
The resistance of a wire is directly proportional to its length and inversely proportional to its cross-sectional area. When the wire is lengthened by a factor of 4.65, its resistance will increase by the same factor.
This is because the resistance is determined by the ratio of the length to the cross-sectional area. As the length increases, the resistance increases proportionally. However, the volume of the wire remains constant during the stretching process.
Since the wire has a circular cross-section, its volume is given by V = πr^2L, where r is the radius and L is the length. Since the volume is unchanged, when the length is increased by a factor of 4.65, the cross-sectional area must decrease by the same factor to compensate.
The cross-sectional area of a circular wire is given by A = πr^2. If the length is increased by 4.65 times, the radius will decrease by the square root of 4.65 (approximately 2.155).
Consequently, the cross-sectional area will decrease by the same factor (2.155^2), resulting in a decrease in resistance by a factor of 4.65^2 (approximately 21.6). Therefore, the resistance of the wire after stretching is 21.6 times the original resistance (21.6R).
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how is stratospheric ozone created?
A. Radiant energy from the sun breaks apart oxygen molecules freeing single oxygen atoms that recombine into ozone
B. When ultraviolet radiation passes through a depleted ozone layer it acts on oxygen at ground levels creating ozone
C. Ozone is formed in when sulfur and nitrogen oxides combine with water in the atmosphere
D. Ozone created from NOx and VOC gases rise from low altitudes into the stratosphere and form the ozone layer
Answers
Answer:
Its actually D
Explanation:
I hope you get it right^^, Have a nice day!
After hearing about an accident on his normal route, mr. gujral checks for alternate routes to get to work. what type of circuit does this traffic situation model? a series circuit because there is more than one path a series circuit because there is only one path a parallel circuit because there is more than one path a parallel circuit because there is only one path
Answers
The type of circuit does this traffic situation model will be a parallel circuit because there is more than one path.
What is a parallel circuit?A parallel circuit has branches that split the current such that just a portion of it passes through each branch.
The voltage or potential difference between each branch of a parallel circuit is the same, but the currents might differ.
A parallel circuit is having more than one path in order to reach it on time he has to take a different path.
Hence the type of circuit does this traffic situation model will be a parallel circuit because there is more than one path.
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Answer:
C) a parallel circuit because there is more than one path
Explanation:
C) a parallel circuit because there is more than one path
What is a stationary front?
A. When a cold air mass and a warm air mass meet and don't move
B. When a cold air mass remains in place
C. When two cold air masses meet and don't move
D. When a warm air mass doesn't move
Answers
Mr B’s car ran out of gas on the side of the road. If he wants to push it on the gas station, he needs to apply force that is greater than the force of friction between the car and the road to get his car moving. If he has to do 52,000 J of work to move the car 170 m, what force is required to move the car ?
Answers
Answer:
W = F s
F = 5.2E4 J / 170 m = 301 N
Increases in the planet's temperature over the past few decades can be attributed to
Answers
Excess Carbon Monoxide(CO) attributed to increases in the planet's temperature over the past few decades
While carbon monoxide (CO) poisoning is the world's most common cause of poisoning death, correlations between CO poisoning and weather are yet unknown.
The incidence risk of acute CO poisoning is influenced by temperature changes, however, the effects vary in Taiwan depending on the season and the person. Our research quantifies the effects of environmental variables and offers essential support for healthcare professionals to create preventive measures to lower the incidence of acute CO poisoning.
An earlier study conducted in Beijing found a negative correlation between temperature and the frequency of acute Carbon Monoxide poisoning. While the impact of other significant weather variables (such as relative humidity and wind speed) on this issue is still unknown, prior research has mostly focused on the relationship between temperature variations and CO poisoning.
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A planes kaverage speed between two cities is 610 km/hr. If the trip takes 2. 25 hrs. How far dose the plane fly
Answers
A planes average speed between two cities is 610 km/hr. If the trip takes 2. 25 hrs, then the distance covered by a plane is 1372.5 kilometers.
To calculate the distance the plane flies, we can use the formula:
Distance = Speed × Time
Given that the average speed of the plane is 610 km/hr and the trip takes 2.25 hours, we can substitute these values into the formula to find the distance.
Distance = 610 km/hr × 2.25 hrs
To multiply these values, we need to align the units correctly. By canceling out "hrs" in the numerator and denominator, we get:
Distance = 610 km × 2.25
Multiplying 610 km by 2.25 gives us:
Distance = 1372.5 km
Therefore, the plane flies a distance of 1372.5 kilometers.
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Given that a plane's average speed between two cities is 610 km/hr and the trip takes 2.25 hrs. We are to find the distance covered by the plane The plane flies 1372.5 km
Let's find the solution to this problem .The formula for distance, speed and time isd
= s * there,
d = distance covered by the planes
= speed t
= time taken
Substituting the given values, we have610 × 2.25 = 1372.5 km
Hence, the plane flies 1372.5 km.
Given that a plane's average speed between two cities is 610 km/hr and the trip takes 2.25 hrs. We are to find the distance covered by the plane
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How to integrate 1/ 1 + x2
Answers
The integral of 1/(1 + x²) is (1/2)ln|1 + x²| + C where C is the constant of integration.
Integration is a mathematical process of finding the antiderivative of a function. To integrate the given expression 1/(1 + x²), we will use the substitution method.
Let u = 1 + x², du/dx = 2x dx, then dx = du/2x and the integral becomes:
∫1/(1 + x²) dx = ∫1/u * (1/2x) du= (1/2)∫1/u du
The antiderivative of 1/u is ln|u| + C, where C is the constant of integration.
Therefore, the final solution of the integral is (1/2)ln|1 + x²| + C.
Let us work through the steps:
Step 1:Let u = 1 + x² and then differentiate both sides with respect to x to obtain du/dx. du/dx = 2x
Substitute 2x dx = du into the integral ∫1/(1 + x²) dx to get the integral in terms of u:∫1/u * (1/2x) du = (1/2) ∫1/u du
Step 2:Calculate the antiderivative of 1/u, which is ln|u|. Thus, the final solution is (1/2)ln|1 + x²| + C, where C is the constant of integration. The constant C will vary depending on the initial conditions of the problem.
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Because of inertia, it will be ____ to stop a larger object than a smaller object if they are both moving at the same speed.
Answers
Answer:
harder
heavier objects resist change more than lighter objects.
This is because larger objects have more mass and thus more inertia
A hockey player skates across a rink of length 75m in 8.9 seconds. What is the average speed of the hockey player? The hockey player is moving at a speed of 9.5 m/s. If it takes him 2 seconds to come to a stop under constant acceleration, how far does he travel while stopping?
Answers
The average velocity is given by
\(v=\frac{d}{t}\)Where d is the distance covered and t is the time taken.
For the given case, we have
d = 75 m
t = 8.9 s
\(v=\frac{d}{t}=\frac{75}{8.9}=8.43\; \frac{m}{s}\)Therefore, the average speed of the hockey player is 8.43 m/s
The hockey player is moving at a speed of 9.5 m/s.
Which is an example of current electricity?
OA. Wind turns a generator, causing electrons to flow into power lines.
O B. Positively and negatively charged particles are attracted to each
C. A person's hair sticks up after it is combed with a plastic comb.
OD. Clothes stick to one another after being removed from a dryer.
other.
Answers
Answer:
c
Explanation:
i think
Answer: B
Explanation:
In a 30cm by 25cm rectangle, a quadrant of a circle of radius 7cm has been cut away from each corner. What is the perimeter of the part left?
Answers
Answer: 98cm
Explanation:
Dimension of rectangle = 30cm by 25cm
Length(l) = 30cm
Width(w) = 25cm
Perimeter of a rectangle = 2(l + w)
Quadrant of circle cut away of each side of the rectangle :
Radius = 7 cm =
That is, the dimension of the triangle reduces by 2 * 7 = 14cm
New length = 30 - 14 = 16cm
New width = 25 - 14 = 11cm
The four corners =( 4 × 2πr ) / 4
2πr = 2 × 22/7 × 7 = 44cm
Perimeter = 2(16cm + 11cm)
= 2(27cm)
Perimeter = 54cm + 44 = 98cm
how much heat is needed to heat 2 kg of lead from 265K to 315 K 
Answers
Answer:
it takes 64 J of heat energy to heat 2 kg of lead from 265 K to 315 K.
Explanation:
To find out how much heat is needed to heat 2 kg of lead from 265K to 315 K, we can use the formula for specific heat capacity, which is:
q = mcΔT
Where:
q = heat energy (in joules)
m = mass of the substance (in kilograms)
c = specific heat capacity of the substance (in joules per kilogram per degree Celsius)
ΔT = change in temperature (in degrees Celsius)
The specific heat capacity of lead is 0.128 J/g°C. we need to convert it to J/kg°C
So, the heat energy needed is:
q = (2 kg)(0.128 J/kg°C)(315 K - 265 K)
q = (2 kg)(0.128 J/kg°C)(50 K)
q = 64 J
Therefore, it takes 64 J of heat energy to heat 2 kg of lead from 265 K to 315 K.