and electric motor lifts an elevator a vertical distance of 18.0m in a time of 30.0s by exerting an upward force of 6.0x10^3 N . what power does the electric motor produce?
Answers
Answer:
\(\fbox {3.6kW}\)
Explanation:
Formula used :
\(\boxed {P = F \times v} \leftarrow \rightarrow \boxed {P = \frac{F \times S}{t}}\)
Given :
⇒ F = 6 × 10³ N
⇒ S = 18 m
⇒ t = 30 s
Solving :
⇒ P = 6 × 10³ × 18 / 30
⇒ P = 2 × 100 × 18
⇒ P = 3600 W
⇒ P = 3.6kW
Related Questions
A skydiver sky dives from an airplane. The amount of air resistance she is met with is measured at each second following her jump.
Time after jump Weight Air Resistance
1 sec 500 N 200 N
2 sec 500 N 300 N
3 sec 500 N 400 N
4 sec 500 N 500 N
Which statement best identifies her speed at each second? (AKS 8C DOK 2)
answer choices
She will be going faster at second 5
She has the fastest speed at second 1
She has the fastest speed at second 4
She has the slowest speed at second 1
Answers
The statement best identifies her speed at each second is She has the fastest speed at second 4.
As the skydiver falls faster, the drag increases until it reaches the magnitude of gravity. When drag becomes as great as gravity, a force balance is reached and the skydiver stops accelerating. To simplify the topic.
We can say that the two most common factors that directly affect the amount of drag are object velocity and object cross-sectional area. Gravity and air resistance act on a skydiver jumping out of an airplane. The speed at which an object falls and the shape of the object on the surface on which the force of air resistance acts.
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3 resitor is connected in series to a 6 resior and a 12-v battery.what is the current in each of the resistors ? what is the voltage drop across each resitor?
Answers
The current in each resistor is 4 A, 2 A, and 4 A, respectively. The voltage drop across each resistor is 12 V.
When three resistors are connected in series with a six resistor and a 12-volt battery, the total resistance of the series circuit is R = R1 + R2 + R3 + ...
The current flowing through the circuit is the same at every point. So, if we want to know the current flowing through each resistor, we need to use Ohm's law, I = V/R, where V is the voltage of the battery and R is the resistance of each resistor.
I1 = V/R1 = 12/3 = 4 AI2 = V/R2 = 12/6 = 2 AI3 = V/R3 = 12/3 = 4 A. The voltage drop across each resistor can be calculated using Ohm's law, V = IR.
V1 = I1R1 = 4 x 3 = 12 VV2 = I2R2 = 2 x 6 = 12 VV3 = I3R3 = 4 x 3 = 12 V.
Therefore, the current in each resistor is 4 A, 2 A, and 4 A, respectively. The voltage drop across each resistor is 12 V.
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What is this scientific model illustrating?
Please help
Answers
Answer:
Water
Explanation:
There is one Oxygen Atom and two Hydrogen molecules. The molecule is Dihydrogen Monoxide, commonly known as water.
A satellite is in circular orbit just above the surface of the Moon.
What is the satellite's acceleration?
The value of gravitational constant is 6.67259 X 10^-11 Ncdotm^2/kg^2 and the mass of the moon in 7.36 X 10^22 kg and its radius is 865.2km.
what is the satellite's speed
what is the period of the satellites orbit
Answers
To determine the satellite's acceleration, we can use the centripetal acceleration formula:
a = v^2 / r
where a is the acceleration, v is the satellite's speed, and r is the radius of the orbit.
Given the values:
Gravitational constant (G) = 6.67259 x 10^-11 N·m^2/kg^2
Mass of the Moon (M) = 7.36 x 10^22 kg
Radius of the Moon (r) = 865.2 km = 8.652 x 10^5 m
To find the satellite's acceleration, we need to calculate the radius of the orbit first. Since the satellite is in a circular orbit just above the surface of the Moon, the radius of the orbit is equal to the radius of the Moon:
r = 8.652 x 10^5 m
Now we can calculate the acceleration:
a = (G * M) / r^2
a = (6.67259 x 10^-11 N·m^2/kg^2 * 7.36 x 10^22 kg) / (8.652 x 10^5 m)^2
Simplifying the expression:
a ≈ 1.622 m/s^2
Therefore, the satellite's acceleration is approximately 1.622 m/s^2.
To find the satellite's speed, we can use the following formula:
v = √(G * M / r)
Substituting the values:
v = √(6.67259 x 10^-11 N·m^2/kg^2 * 7.36 x 10^22 kg / 8.652 x 10^5 m)
Simplifying the expression:
v ≈ 1,678.14 m/s
Therefore, the satellite's speed is approximately 1,678.14 m/s.
To find the period of the satellite's orbit, we can use the following formula:
T = 2πr / v
Substituting the values:
T = (2π * 8.652 x 10^5 m) / 1,678.14 m/s
Simplifying the expression:
T ≈ 3,263.81 seconds
Therefore, the period of the satellite's orbit is approximately 3,263.81 seconds.
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1. A toy car is marked to go at 0.5m/s, which of the following sets of
experimental numbers stay precise? *
a. 1.5m/s, 0.9m/s, 0.8m/s, 1.1m/s
O b. 0.6m/s, 0.7m/s, 0.61m/s, 0.62m/s
c. 2.1 m/s, 2.0m/s, 2.03m/s, 2.4m/s
d. 3.1m/s, 3.0m/s, 2.9m/s, 3.0m/s
Answers
Answer:
b. 0.6m/s, 0.7m/s, 0.61m/s, 0.62m/s
Explanation:
Precision of a measurement is the closeness of the experimental values to one another. Hence, experimental measurements are said to be precise if they are close to each other irrespective of how close they are to the accepted value. Precision can be determined by finding the range of each experimental value. The measurement with the LOWEST RANGE represents the MOST PRECISE.
Note: Range is the highest value - lowest value
Set A: 1.5 - 0.8 = 0.7
Set B: 0.7 - 0.6 = 0.1
Set C: 2.4 - 2.0 = 0.4
Set D: 3.1 - 2.9 = 0.2
Set B has the lowest range (0.1), hence, represent the most precise value.
Answer all questions in the spaces provided. Kalpana finds a small stone. To help her identify the type of stone, Kalpana decides to find its density. Kalpana explains why she thinks this will help. Her friend Diana disagrees. Below are their explanations. Kaplana The density will be the same, whatever the size of the stone, as long as the type of rock is the same. Bigger stones will have a higher density because they are heavier. Diana (a) Whom do you think gave the correct explanation? Give a reason. (2 marks) ******
Answers
I believe Kalpana gave the correct explanation.
The reason is that density is a property of a material that remains the same regardless of the size of the sample. Density is defined as mass divided by volume (density = mass/volume), and it is a characteristic property of a particular type of rock.
Bigger stones will indeed be heavier, but their volume will also increase proportionally, maintaining the same density value. So, the density will be the same for any size of the stone, as long as the type of rock is the same.
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complete question not found in search engine.
To demonstrate the ideas of electric current and resistivity the following experiment was conducted using a 10.0 m long 1.00 m diameter pipe. The pipe is connected to an air pump which produces high air pressure at one end. The other end of the pipe is open to the surrounding air, and the pump maintains a constant difference in air pressure between the two ends. Six hundred electrically charged ping pong balls are injected into the pipe with velocities that have random magnitudes and directions. Due to the difference in air pressure, the balls drift from the high pressure end of the pipe to the low pressure end at a speed of 2.00 cm/s. If every ping pong ball is given a charge of 6.00 microcoulombs, how much current flows through the pipe?
Solution:
First determine the total charge by multiplying 600 balls by 6.00 microC/ball. This yields 3600 μC.
Next, determine the time by dividing the distance by the speed (watch the units.), yielding 500 s.
Lastly, current is charge per unit time, so divide 3600 μC/500s to get 7.00 microamps.
= 7.00 microamps
Answers
The question asks how much current flows through the pipe when 600 ping pong balls with 6.00 microC of charge each are injected into the pipe and drift from the high-pressure end to the low-pressure end at a speed of 2.00 cm/s.
Using the formula for current (I = Q/t), where I is current, Q is charge, and t is time,
we can determine the current flowing through the pipe.
First, we need to determine the total charge by multiplying 600 balls by 6.00 microC/ball, yielding 3600 μC.
Next, determine the time by dividing the distance (10.0 m) by the speed (2.00 cm/s) to get 500 s. Lastly, current is the charge per unit time, so divide 3600 μC/500s to get 7.2 microamps.
Therefore, the amount of electric current flowing through the pipe is 7.2 microamps.
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a 0.400 kg mass hangs from a string with a length of 0.9 m, forming a conical pendulum. the period of the pendulum in a perfect circle is 1.4 s. What is the tension on the string?
Answers
The string is under 4.82N of tension.
Tension is the pulling force exerted on a string, rope, cable, or wire when it is stretched or pulled. The tension on a string is equal to the amount of force applied to it divided by its cross-sectional area.
The tension on the string of a conical pendulum can be calculated using the equation:
\(T =\frac{ (4\pi^2m)}{(L^2T^2)},\)
where T is the string's tension, m is the pendulum's mass, L is the string's length, and T is the pendulum's period of motion.
m=mass of pendulum=0.400kg
L=length of string =0.9m
T=pendulum's period of motion=1.4s
Plugging in the given values, we get:
\(T =\frac{ (4 \pi^2 * 0.400 kg) }{ (0.9 m^2 * 1.4 s^2)}\\\\T = 4.82 N\)
Therefore,The Tension on the string is 4.82N
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A cart of mass m is moving with speed v on a smooth track when it encounters a vertical loop of radius r, as shown above. the cart moves along the inside of the entire loop without leaving the track. all frictional forces are negligible.Which of the following must be true for the cart to remain on the track when it is at point P?
Answers
Therefore for cart to stay here on track when it arrives at point P, the net force applied to it must be greater or equal than for the heaviness of the cart.
Describe force.The force is an impact that has the power to alter an object's motion. A mass-containing object's velocity can be altered by a force. An obvious way to describe force is as a pushed or a pull. A vector quantity is called a force since it has both strength and the direction.
Which force is the most crucial?The strongest force in existence is thought to be the strong force. The gravitation, weak, and electromagnetism forces come after it in lowest to highest.
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Physics question I have a test Friday
Answers
Answer:c
Explanation:
Examine the motion map. One animal is an antelope that is already running. The other is a cheetah that starts running after the antelope passes it. Does A or B represent the motion of the cheetah?
Answers
Answer:
A although am not seeing the cheetah
How many oxygen (O) atoms are in a molecule of SiO2?
O A. 1
OB. 3
C. 4
D. 2
Answers
A 2-kg mass is attached to a spring whose constant is 18 N/m, and it arrives at the position
of balance. From
t = 0, an external force equal to
f(t)=2sin2t.
Find the resulting equation of motion.
Answers
The resulting equation of motion for the system is given by m × x''(t) + k × x(t) = f(t), which is 2 × x''(t) + 18 * x(t) = 2 * sin(2t).
What is equation of motion?
The equations of motion are a set of mathematical relationships that describe the motion of objects under the influence of forces. There are different sets of equations of motion, depending on the specific scenario and the type of motion being considered (linear motion, projectile motion, circular motion, etc.). The equations of motion for linear motion, also known as the equations of uniformly accelerated motion.
To find the equation of motion for the system, we start with Newton's second law of motion, which states that the sum of forces acting on an object is equal to the mass of the object multiplied by its acceleration. In this case, the object is the 2-kg mass attached to the spring.
The force exerted by the spring is proportional to the displacement of the mass from its equilibrium position, and it can be expressed as F_spring = -k× x(t), where k is the spring constant and x(t) is the displacement of the mass at time t.
In addition to the force exerted by the spring, there is an external force f(t) = 2 ×sin(2t) acting on the mass.
Applying Newton's second law, we have the equation of motion: m ×x''(t) + k ×x(t) = f(t).
Substituting the given values, m = 2 kg and k = 18 N/m, we obtain 2 ×x''(t) + 18 × x(t) = 2 ×sin(2t).
Therefore, the resulting equation of motion for the system is 2 × x''(t) + 18 × x(t) = 2 × sin(2t).
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3. We consider a conducting sphere of radius R consisting of two hemispheres. The upper hemisphere is kept at the potential V while the lower hemisphere is kept at the potential −V. We can use the Green function method to calculate the scalar potential ϕ. The Dirichlet Green function G p
(r,r ∗
) is given as follows: G D
(r,r ′
)= r 2
+r ′2
−2rr ′
cosγ
1
− r 2
r ′2
/R 2
+R 2
−2rr ′
cosγ
1
The r vector denotes the position of observation and the r ′
vector denotes the position of charges where γ is the angle between r and r ∗
. Using the above Green function. calculate the potential along the positive z-axis.
Answers
By integrating the given equation, we can find the potential ϕ as a function of z.
Let's consider a point P along the positive z-axis with coordinates (0, 0, z). To find the potential at point P, we integrate the Green function G_D(r, r') with respect to the charge distribution over the surface of the conducting sphere.
The potential ϕ at point P can be calculated using the following integral:
ϕ(P) = ∫∫ G_D(r, r') σ(r') dS
Here, σ(r') represents the charge density on the surface of the sphere, and dS represents the differential surface element.
Since we are interested in the potential along the positive z-axis, we can simplify the integral by considering the symmetry of the problem. Due to symmetry, the potential ϕ will only depend on the radial distance r from the z-axis. Thus, we can rewrite the integral as:
ϕ(P) = 2π∫ G_D(r, r') σ(r') r' dr'
Now, we need to express the charge density σ(r') in terms of the potential difference V and the radius R. The charge density on the upper hemisphere is V/(4πR^2), and on the lower hemisphere, it is -V/(4πR^2). Therefore, we can write:
ϕ(P) = (V/R^2) ∫ (r^2 + r'^2 - 2rr')/(r-r')^2 r' dr'
This integral can be evaluated using appropriate techniques of integration.
By integrating the above equation, we can find the potential ϕ as a function of z.
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A car traveling south is 200 kilometers from its starting point after 2 hours. What is the average velocity of the car? (OP A. 100 kilometers/hour south B. 200 kilometers/hour C. 200 kilometers/hour north 100 kilometers/hour
Answers
Answer:
A
Explanation:
take note that v=d/t (velocity is distance over(divided by) time, so in this case it would be 200 (distance) divided by 2 (time)
A gas of certain mass occupies a volume of 650cm3 under a pressure of 750mm hg. calculated the pressure under which the volume of the gas will be reduced by 10 percents of its original volume???
Answers
Answer:
just know that if the volume is reduced by 10 the the pressure is increased by 10
Indicate how many electrons must be gained or lost by each of the following achieve a stable electron configurations.
Answers
a) Strontium has 38 electrons.
Its electronic configuration is,
\(\begin{gathered} Sr-1s^22s^22p^63s^23p^64s^23d^{10}4p^65s^2 \\ =\lbrack Kr\rbrack5s^2 \end{gathered}\)As it can be seen, the valency of strontium is 2. Thus it needs to lose 2 electrons to be stable.
Thus the answer is '2 lost'.
b) The atomic number of antimony is 51. The electronic configuration of antimony (Sb) is
\(Sb=\lbrack Kr\rbrack4d^{10}5s^25p^3\)Thus The
A stick of length 5 m lies radially in the field of a black hole where GM/(c2r)=30×10−2. What coordinate distance does it take up?
Answers
The coordinate distance that a stick of length 5m takes up radially in the field of a black hole where GM/(c^2r) = 30 × 10^-2 is approximately 0.429 meters. The Schwarzschild radius formula is used to determine this. It is an equation that relates the mass of an object to the radius of a sphere surrounding it, which is known as the Schwarzschild radius.
What is the Schwarzschild radius formula?The Schwarzschild radius formula is derived from Einstein's general theory of relativity, which states that gravity warps the fabric of spacetime. According to the formula, the Schwarzschild radius (rs) is determined by the following equation:rs = 2GM/c^2Where G is the gravitational constant, M is the mass of the object, and c is the speed of light. If a mass is compressed into a space smaller than its Schwarzschild radius, it becomes a black hole.
Furthermore, for a stick of length 5 m in length, the coordinate distance that it takes up can be determined as follows:Length of the stick = 5mSchwarzschild radius (rs) = 2GM/c^2 = 30 x 10^-2 mTherefore, the coordinate distance that a stick of length 5 m takes up radially in the field of a black hole where GM/(c^2r) = 30 × 10^-2 is approximately 0.429 meters.
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What is the best description of the destructive interference of light?
The crest of one wave overlaps with the trough of another.
A mechanical wave meets an electromagnetic wave.
A longitudinal wave meets a transverse light wave.
The crests of two waves intersect.
Answers
Destructive interference occurs when the maxima of two waves are 180 degrees out of phase: a positive displacement of one wave is cancelled exactly by a negative displacement of the other wave.
Answer:
The crest of one wave overlaps the trough of another.
Answer:
The crest of one wave overlaps with the trough of another.
If a full moon was just witnessed on earth, when will the next full moon be visible?.
Answers
The most impressive Moon phase is the full moon when the Moon is fully illuminated. The Moon is fully illuminated by the Sun when it and the Sun are in perfect alignment on opposing sides of the Earth (see illustration).
However, as seen from Earth, some Full Moons are only 99.9% lit. Because the Moon's orbit around Earth is inclined at an angle of roughly 5° in reference to the Earth's orbital plane, the ecliptic, we sometimes cannot view the entire illuminated hemisphere of the Moon during Full Moons.
We view the Moon at an angle that somewhat reduces the illumination, whether the Full Moon occurs at a time when the Moon is above or below the ecliptic.
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two particles each having a mass of 5g and charge of 1.0×10^-7C stay in limiting equilibrium on a horizontal table with a separation of 10cm . The coefficient of friction between them and the table is same . Find the value of this coefficient.
Answers
The value of the coefficient is μ=0.18.
What is meant by Friction?A force that opposes this motion of the hands is activated when they brush against one another. The frictional force is the force resisting motion that is exerted in the direction that is counter to the direction that the hands are moving, and it is what creates heat energy.The force that prevents one solid item from moving across another is known as friction. Static, sliding, rolling, and fluid friction are the four main categories of friction.Many times, the uses of friction can be understood by imagining what would happen in their absence. You wouldn't be able to walk, operate a car, or grip anything if there was no friction. Pencils and pencils wouldn't function. Using brakes on a car or bicycle to halt requires friction as well.Find the value of this coefficient.
The particles are in equilibrium, meaning the net force on them is zero.
Thus, repulsion due to their charge = friction due to the table.
As the equilibrium is limiting, friction reaches its maximum value.
\(\frac{kQ^{2} }{r^{2} }\)=μmg
\(k=9*10^{9} Nm^{2} C^{-2}\)The electrostatic constant \(Q=10^{-7} C\) is the charge, and r=0.1m is the distance between the charges.
\(\frac{(9*10^{2})(10^{-7})^{2} }{(0.1)^{2} }\)=μ*\((5*10^{-3})(10)\)
Therefore, The answer is μ=0.18.
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A biker is going downhill, we traveled 30km in one fourth of an hour. What is his speed?
Answers
Answer:
120 km an hour
Explanation:
120 km an hour because 30x 4 is 120
If you want to calculate the acceleration of a car, you should _____ the change in velocity of the car by the time interval.
A. Multiply
B. Increase
C. Divide
D. Decrease
Answers
Answer:
Your awnser is B. Increase
Explanation:
Answer:
divide
Explanation:
u should divide the velocity by time interval because a=vf-vi/t
write down the interrelationship between distance covered , initial velocity and timetaken by a moving body.
Answers
Answer:
\(s = v_it + \frac{1}{2}at^2\)
Explanation:
The interrelationship between the distance covered by a body, the initial velocity of the body, and the time taken by the moving body during its motion is given by the second equation of motion.
The second equation of motion is given as follows:
\(s = v_it + \frac{1}{2}at^2\)
where,
s = the distance covered by the body
vi = initial velocity of the body
t = time taken by the body during motion
a = acceleration of the body
Which is an example of nuclear energy being converted into heat and light?
A a volcano
B The sun
C A rocket engine
D A coal burning power plant
Answers
Answer:
D. A coal burning power plantExplanation:
it is a coal power plant , nuclear power is economical and does not fluctuate as much as wind or solar power.
Unlike coal, it is considered clean in terms of the amount of greenhouse gas emissions produced by the power plant itself, although uranium mining and processing are not without risks and environmental impact
Two objects with the same mass move with the same speed but in opposite directions. Compare their kinetic energies.
A.
Kinetic energies are equal.
B.
Kinetic energies are opposite in magnitude.
C.
Kinetic energy of the higher object is greater.
D.
Kinetic energy of the lower object is greater.
Answers
Answer:
A. Kinetic energies are equal.
Explanation:
The kinetic energy of the bodies will be equal since the mass and speed are the same.
Kinetic energy is the energy due to the motion of a body.
Mathematically;
K.E = \(\frac{1}{2}\) m v²
m is the mass
v is the speed
The kinetic energy is a scalar quantity with no regard for direction.
Answer:kinetic energies are equal
Explanation:
Similarities and differences between chemical and nuclear energy sources include.
Answers
The similarities and differences between chemical and nuclear energy sources includes the origin of their existence and the problem of waste production respectively.
The differences between the sources of chemical energy and nuclear energy are,
• The sources of chemical energy includes batteries Biomass, Petroleum, natural gas and coal etc.
• On the other hand, sources of nuclear energy includes radioactive materials like uranium and plutonium.
The similarities between the sources of chemical energy and nuclear energy are,
Both the chemical energy sources and the nuclear energy sources are present in Limited amount.
Substances like uranium, plutonium, natural gas petroleum are not reusable.
Also, both the sources produces a great threat for the environment.
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Vector A is 3.2 m in length and points along the positive y-axis. Vector B is 4.6 m in length and points
along a direction 195° counterclockwise from the positive x-axis. What is the magnitude of the resultant
when vectors A and B are added?
Answers
Which types of changes observe the law of conservation of mass?
A.only changes of state
B.only physical changes
C.only chemical changes
D.physical changes and chemical changes
Answers
Answer:
I think it might be umm... b
The correct answer is actually D
Explanation: i got it right on my district assignment! :)
WILL MARK AS BRAINLIEST..... A constant force vector f =2i cap+3j cap-5k cap acts on a particle and displaces it from (1,2,-3) m to (2,5,-1) m. find the work done by the force . Plzzzzzzzz helppppppppp !!!!!!!!!
Answers
Answer:
W = 1 J
Explanation:
Given that,
A constant force, \(F=2i+3j-5k\)
The particle displaces it from (1,2,-3) m to (2,5,-1) m. We need to find the work done by the force.
The position vector from (1,2,-3) m to (2,5,-1) m is (2-1, 5-2, -1-(-3)) i.e. (1, 3, 2) m
Work done is given by :
\(W=F{\cdot} d\\\\W=(2i+3j-5k){\cdot} (i+3j+2k)\)
From dot product, i.i = j.j = k.k = 1
So,
\(W=2+3\times 3-5\times 2\\\\W=1\ J\)
So, the work done by the force is 1 J.