Answer:
Thermal energy is directly related to heat because thermal energy is how heat is transfered.
What is the ratio P1/P2P1/P2 of their power dissipations if the same current passes through each resistor
This question is incomplete, the complete question is;
Resistors 1 and 2 are connected to identical batteries, resistor 1 dissipates 4.0 times more power than resistor 2
What is the ratio P1/P2of their power dissipations if the same current passes through each resistor
Answer:
the ratio P₁/P₂ of their power dissipations is 0.25
Explanation:
Given the data in the question;
[tex]P_{i}[/tex] = [tex]I^{2} . R_i[/tex] --------------let this be equation 1
[tex]P_{i}[/tex] = [tex]\frac{V^{2} }{R_i}[/tex] -----------------let this be equation 2
P₁ = V²/R₁
P₁ = 4P₂
so
P₁ = V²/R₁ = 4( V²/R² )
now, form the above equation;
R₁ = R₂/4
using equation 1, we get;
P₁ = [tex]I^{2} . R_1[/tex]
P₂ = [tex]I^{2} . R_2[/tex]
Hence;
P₁ = [tex]I^{2}[/tex]( R₂/4)
P₁ = [tex]I^{2}[/tex] × ( R₂/4)
P₁ = (1/4) P₂ or 0.25
Therefore; the ratio P₁/P₂ of their power dissipations is 0.25
How do you do Conservation of Momentum and Energy?
NEED HELP When a guitar string is plucked, what part of the standing wave is found at the fixed ends of the string?(1 point)
the nodes
the resonance
the antinodes
the harmonics
advantages of alcohol as a thermometric substance
Answer:
it helps to measure temperature of body
it contracts on cooling and expands on heating which is suitable to use as
thermometric substance
A spherical shell with a net charge of 3Q surrounds a point charge of -q at the center of the shell. The charges on the inner and outer surfaces of the shell are:
Answer:
1) The charge on the outer shell is +4·Q
2) The charge on the inner shell is +Q
Explanation:
1) The given parameters of the spherical shell are;
The net charge on the spherical shell = 3·Q
The point charge surrounded by the spherical shell = -Q
Let 'x' represent the charge on the outer shell, and let 'y', represent the charge on the inner shell, we have;
The net charge, 3·Q = -q + x
∴ x = 3·Q + Q = 4·Q
The charge on the outer shell, x = 4·Q
2) The net charge in the shell is zero, therefore, the charge on the inner shell, 'y', is given as follows;
-Q + y = 0
∴ y = +Q
The charge on the inner shell, y = +Q
What is the net force on the purple ring in the picture above. _________
Answer:
equal
Explanation:
Because of Newton's third law
The average marathon runner can complete the 42.2-km distance of the marathon in 3 h and 30 min. If the runner's mass is 85 kg, what is the runner's average kinetic energy during the run
Answer:
the runner's average kinetic energy during the run is 476.96 J.
Explanation:
Given;
mass of the runner, m = 85 kg
distance covered by the runner, d = 42.2 km = 42,200 m
time to complete the race, t = 3 hours 30 mins = (3 x 3600s) + (30 x 60s)
= 12,600 s
The speed of the runner, v = d/t
v = 42,200 / 12,600
v = 3.35 m/s
The runner's average kinetic energy during the run is calculated as;
K.E = ¹/₂mv²
K.E = ¹/₂ × 85 × (3.35)²
K.E = 476.96 J
Therefore, the runner's average kinetic energy during the run is 476.96 J.
In which type of collision is no kinetic energy converted to heat or sound
energy?
Answer:
elastic collision
An elastic collision occurs when the two objects "bounce" apart when they collide. Two rubber balls are a good example. In an elastic collision, both momentum and kinetic energy are conserved. Almost no energy is lost to sound, heat, or deformation.
I hope it's helpful!
A straight wire in a magnetic field experiences a force of 0.026 N when the current in the wire is 1.5 A. The current in the wire is changed, and the wire experiences a force of 0.063 N as a result. What is the new current
Answer:
the new current on the wire is 3.64 A.
Explanation:
Given;
first force on the wire, F₁ = 0.026 N
second force on the wire, F₂ = 0.063 N
first current on the wire, I₁ = 1.5 A
second current on the wire, I₂ = ?
The force on a current carrying conductor placed in a magnetic field is given as;
[tex]F = BIL(sin \theta)\\\\[/tex]
F ∝ I
[tex]\frac{F_1}{I_1} = \frac{F_2}{I_2} \\\\I_2 = \frac{F_2I_1}{F_1} \\\\I_2 = \frac{0.063\ \times\ 1.5 }{0.026} \\\\I_2 = 3.64 \ A[/tex]
Therefore, the new current on the wire is 3.64 A.
Pls tell me
Question: 1 way to keep people safe from hurricane.
Answer:
Hurricanes move fast so what you want to do is get into a basement or somthing underground so it will be harder for the hurricane to hit you
Explanation:
thanks for the coins
What is the momentum of a 6.5 kg bowling ball with a velocity of 3.0 m/s?
Answer:
19.5
Explanation:
momentum = mass * velocity
momentum = 6.5 * 3
momentum = 19.5
On a sunny day, a rooftop solar panel delivers 60 W of power to the house at an emf of 17 V. How much current flows through the panel
Answer:
3.53 amps
Explanation:
Given data
Power= 60W
Voltage= 17V
The expression relating current, power, and voltage is
P= IV
substitute
60= I*17
I= 60/17
I= 3.53 amps
Hence the current that flows is 3.53 amps
If the current in each wire is the same, which wire produces the strongest magnetic field?
-a wire that is 1 mm thick and not coiled
-a wire that is 2 mm thick and not coiled
-a 1-mm-thick coiled wire with ten loops
-a 2-mm-thick coiled wire with two loops
Answer:
C
Explanation:
I did this before
Answer:
it is c
Explanation:
cuz i know
The skater lowers her arms as shown in the adjacent
figure decreasing her radius to 0.15 m. Find her new speed.
Answer:
is there more?
Explanation:
Explane Information-processing approach
Do we know which has more potential energy? object A or B? Best answer with reasoning gets brainliest.
Answer:
Object C has the most potential energy.
Between A and B, we do not know which has more potential energy.
Explanation:
We know the object with the most potential energy and this is the object at C.
Potential energy is the energy due to the position of a body above the ground surface.
The higher a body is above ground, the more its potential energy.
Potential energy = mass x acceleration due to gravity x height
So;
Object C has the most potential energy.
Between A and B, we do not know which has more potential energy.
This is because, the height and mass of the objects are not quantified using numbers.
Potential energy is a function of mass and height and acceleration due to gravity but acceleration due gravity is a constant.
Why hurricane is dangerous?
Answer:
Hurricanes are dangerous because they often carry high winds, in which destroy our homes and other recreational buildings. They also cause flooding, which is a threat to crops, animals, and shelters.
Explanation:
If you enjoyed my answer I would very much appreciate a brainliest. Thank you, and have a great day.
~Kai~
She left the cubes in the water for three hours which of the following describes a heat flow that took place during those three hours?
Answer:
veffvevfevve
Explanation:
Explanation:
wht are the choices
attach the choices and illbe happy to help you
in fact i most definitely will
uniform acceleration means the velocity of the body is either increasing or decreasing changing at a constant rate TRUE OR FALSE? thank youu
Answer:
False.
Explanation:
In physics, acceleration can be defined as the rate of change of the velocity of an object with respect to time.
This simply means that, acceleration is given by the subtraction of final speed from the initial speed all over time.
Hence, if we subtract the final speed from the initial speed and divide that by the time, we can calculate an object’s acceleration.
Mathematically, acceleration is given by the equation;
[tex]Acceleration (a) = \frac{initial speed - final speed}{time}[/tex]
[tex]a = \frac{v - u}{t}[/tex]
Where,
a is acceleration measured in [tex]ms^{-2}[/tex]
v and u is initial and final speed respectively, measured in [tex]ms^{-1}[/tex]
t is time measured in seconds.
Additionally, acceleration is a vector quantity because it has both magnitude and direction.
Hence, uniform acceleration means the velocity of the body is increasing at a constant rate. For example, an object or body that is experiencing a free fall in a uniform gravitational field is said to be in uniform acceleration.
nWhat are four key features of our solar system that any theory of solar system formation must be able to explain
Answer: There are vast numbers of asteroids and comets.
Explanation:
There are clear patterns to the rotation and orbits of large bodies in the solar system.
There are a few notable "exceptions to the rules."
Planets fall into two major categories.
Is it safer for a car to decelerate quickly or slowly? And why?
Answer:
It depends on the situations. Stopping at a red light you should start decelerating slowly because if you just stop if a car is behind you they may be unprepared for your sudden stop and slam into you. Decelerating quickly when needed to like if you are about to run into a car or someone pulls out in front of you stopping quickly might be none or less damage.
Explanation:
Answer:
Hello!!! erz here ^^
Explanation:
Have you ever seen someone driving? They usually decelerate slowly for a stop signs/traffic lights... But thats the wrong way to do it, Instead you speed right past that light!
(no but seriously the guy/girl above me is correct xD)
3. Batteries create electricity and generators create electricity. *
True
False
Two coils have the same number of circular turns and carry the same current. Each rotates in a magnetic field acting perpendicularly to its axis of rotation. Coil 1 has a radius of 4.5 cm and rotates in a 0.21-T field. Coil 2 rotates in a 0.39-T field. Each coil experiences the same maximum torque. What is the radius (in cm) of coil 2
Answer:
Explanation:
Torque acting on a coil in a magnetic field = MBsinθ where M is magnetic moment , B is magnetic field and θ is inclination of the normal to coil with direction of field.
For maximum torque sinθ = 1
Maximum torque = MB
M = NIA where N is no of turns , I is current and A is area of the coil
Maximum torque = NIAB
As maximum torque is same
N₁I₁A₁B₁ = N₂I₂A₂B₂
N₁ = N₂ , I₁ = I₂
A₁B₁ = A₂B₂
π R₁² B₁ = π R₂² B₂
4.5² x .21 = R₂² x .39
R₂² = 10.9
R₂ = 3.3 cm .
can you please tell me what this is
Answer:
200000 J
Explanation:
From the question given above, the following data were obtained:
Mass (m) of roller coaster = 1000 Kg
Velocity (v) of roller coaster = 20 m/s
Kinetic energy (KE) =?
Kinetic energy is simply defined as the energy possess by an object in motion. Mathematically, it can be expressed as:
KE = ½mv²
Where
KE => is the kinetic energy.
m =>is the mass of the object
V => it the velocity of the object.
With the above formula, we can obtain the kinetic energy of the roller coaster as follow:
Mass (m) of roller coaster = 1000 Kg
Velocity (v) of roller coaster = 20 m/s
Kinetic energy (KE) =?
KE = ½mv²
KE = ½ × 1000 × 20²
KE = 500 × 400
KE = 200000 J
Therefore, the kinetic energy of the roller coaster is 200000 J.
In the form of radioactive decay known as alpha decay, an unstable nucleus emits a helium-atom nucleus, which is called an alpha particle. An alpha particle contains two protons and two neutrons, thus having mass m
Answer:
[tex]\mathbf{v_a = 4.06 \times 10^7 \ m/s}[/tex]
Explanation:
[tex]\text{The missing part of the question is attached below.} \\ \\ \text{ mass m = 4u and charge q = 2e. Suppose a uranium nucleus with 92 protons decays into }[/tex][tex]\text{into thorium, with 90 protons, and an alpha particle. The alpha particle is initally at rest at }[/tex][tex]\text{ the surface of the thorium nucleus, which is 15 fm in diameter. What is the speed of the alpha}[/tex][tex]\text{particle when it is detected in the laboratory? Assume the thorium nucleus remains at rest. }[/tex]
[tex]\text{So, from the above infromation;}[/tex]
[tex]radius (r) = \dfrac{15 \ fm }{2}[/tex]
[tex]radius (r) = 7.5 \times 10^{-15} \ m[/tex]
[tex]\text{Using the formula for potential energy}[/tex]
[tex]U = \dfrac{(9\times 10^9 \ Nm^2/C^2)(2(1.6\times10^{-19} \ C ))(90)(1.6\times 10^{-19} C)}{7.5 \times 10^{-13} \ m}[/tex]
[tex]U = 5.529 \times 10^{-12} \ J[/tex]
[tex]\text{Now, the speed of the alpha particle can be estimated from the conservation of energy principle}[/tex][tex]\dfrac{1}{2}mv_a^2= 5.529 \times 10^{-12} J[/tex]
[tex]v_a = \sqrt{\dfrac{2(5.529 \times 10^{-12} \ J)}{4(1.67 \times 106{-37} \ kg)}}[/tex]
[tex]\mathbf{v_a = 4.06 \times 10^7 \ m/s}[/tex]
In the design of a rapid transit system, it is necessary to balance the average speed of a train against the distance between station stops. The more stops there are, the slower the train’s average speed. To get an idea of this problem, calculate the time it takes a train to make a 15.0-km trip in two situations: (a) the stations at which the trains must stop are 3.0 km apart (a total of 6 stations, including those at the ends); and (b) the stations are 5.0 km apart (4 stations total). Assume that at each station the train accelerates at a rate 1.1 m/s2 of until it reaches 95 km/h, then stays at this speed until its brakes are applied for arrival at the next station, at which time it decelerates at-2.0 m/s2 Assume it stops at each intermediate station for 22 s.
Answer:
a) t = 746 s
b) t = 666 s
Explanation:
a)
Total time will be the sum of the partial times between stations plus the time stopped at the stations.Due to the distance between stations is the same, and the time between stations must be the same (Because the train starts from rest in each station) we can find total time, finding the time for any of the distance between two stations, and then multiply it times the number of distances.At any station, the train starts from rest, and then accelerates at 1.1m/s2 till it reaches to a speed of 95 km/h.In order to simplify things, let's first to convert this speed from km/h to m/s, as follows:[tex]v_{1} = 95 km/h *\frac{1h}{3600s}*\frac{1000m}{1 km} = 26.4 m/s (1)[/tex]
Applying the definition of acceleration, we can find the time traveled by the train before reaching to this speed, as follows:[tex]t_{1} = \frac{v_{1} }{a_{1} } = \frac{26.4m/s}{1.1m/s2} = 24 s (2)[/tex]
Next, we can find the distance traveled during this time, assuming that the acceleration is constant, using the following kinematic equation:[tex]x_{1} = \frac{1}{2} *a_{1} *t_{1} ^{2} = \frac{1}{2} * 1.1m/s2*(24s)^{2} = 316.8 m (3)[/tex]
In the same way, we can find the time needed to reach to a complete stop at the next station, applying the definition of acceleration, as follows:[tex]t_{3} = \frac{-v_{1} }{a_{2} } = \frac{-26.4m/s}{-2.2m/s2} = 12 s (4)[/tex]
We can find the distance traveled while the train was decelerating as follows:[tex]x_{3} = (v_{1} * t_{3}) + \frac{1}{2} *a_{2} *t_{3} ^{2} \\ = (26.4m/s*12s) - \frac{1}{2} * 2.2m/s2*(12s)^{2} = 316.8 m - 158.4 m = 158.4m (5)[/tex]
Finally, we need to know the time traveled at constant speed.So, we need to find first the distance traveled at the constant speed of 26.4m/s.This distance is just the total distance between stations (3.0 km) minus the distance used for acceleration (x₁) and the distance for deceleration (x₃), as follows:x₂ = L - (x₁+x₃) = 3000 m - (316.8 m + 158.4 m) = 2525 m (6)The time traveled at constant speed (t₂), can be found from the definition of average velocity, as follows:[tex]t_{2} = \frac{x_{2} }{v_{1} } = \frac{2525m}{26.4m/s} = 95.6 s (7)[/tex]
Total time between two stations is simply the sum of the three times we have just found:t = t₁ +t₂+t₃ = 24 s + 95.6 s + 12 s = 131.6 s (8)Due to we have six stations (including those at the ends) the total time traveled while the train was moving, is just t times 5, as follows:tm = t*5 = 131.6 * 5 = 658.2 s (9)Since we know that the train was stopped at each intermediate station for 22s, and we have 4 intermediate stops, we need to add to total time 22s * 4 = 88 s, as follows:Ttotal = tm + 88 s = 658.2 s + 88 s = 746 s (10)b)
Using all the same premises that for a) we know that the only difference, in order to find the time between stations, will be due to the time traveled at constant speed, because the distance traveled at a constant speed will be different.Since t₁ and t₃ will be the same, x₁ and x₃, will be the same too.We can find the distance traveled at constant speed, rewriting (6) as follows:x₂ = L - (x₁+x₃) = 5000 m - (316.8 m + 158.4 m) = 4525 m (11)The time traveled at constant speed (t₂), can be found from the definition of average velocity, as follows:[tex]t_{2} = \frac{x_{2} }{v_{1} } = \frac{4525m}{26.4m/s} = 171.4 s (12)[/tex]
Total time between two stations is simply the sum of the three times we have just found:t = t₁ +t₂+t₃ = 24 s + 171.4 s + 12 s = 207.4 s (13)Due to we have four stations (including those at the ends) the total time traveled while the train was moving, is just t times 3, as follows:tm = t*3 = 207.4 * 3 = 622.2 s (14)Since we know that the train was stopped at each intermediate station for 22s, and we have 2 intermediate stops, we need to add to total time 22s * 2 = 44 s, as follows:Ttotal = tm + 44 s = 622.2 s + 44 s = 666 s (15)why is the compass needle oriented as it is in the diagram
Answer:
its north pole is attracted to the south pole of the magnet
Explanation:
just did the quiz :)
a crane lifts a 75 kg mass at a height of 8m. calculate the gravitational potential energy gained by the mass (g= 10N)
Answer:
6000 J
Explanation:
Potential energy = mass*gravity*height (U = m*g*h)
In this case g = 10 so
U = 75*10*8 = 6000 J (joules) [kg * m^2/s^2]
which form of energy is an example of kinetic energy
Answer:
1. realizing of arrow
2. kicking of ball
3. punching the punching bag
Calculate the force between two objects that have a masses of
1000 kg and 4000 kg that are separated by a distance of 25 m.
1.1 x 10-5 N
4.3 x 1015 N
О
4.3 x 10-7N