Answer:
The south pole of one magnet is near the south pole of the other
magnet.
Which of the following are mechanical
waves?
A. Waves that travel in empty space
B. Sound and ocean waves
C. Light waves
D. X-rays
Which of the following is not a vector quantity?
A. displacement
B. density
C. velocity
D. acceleration
Answer: The answer is density
Questions:
1. A piano is moved up a ramp that is 3 m long with a force of 5
N. What is the work done on the piano? What is the name of the
simple machine for "ramp”? (6)
Formula
Show your steps (with
units)
Answer (with units)
Sentence
Simple Machine
Answer:
Workdone = 15 Nm
Explanation:
Given the following data;
Length of ramp (distance) = 3 m
Force = 5 N
To find the work done on the piano;
Mathematically, work done is given by the formula;
Workdone = force * distance
Substituting into the formula, we have;
Workdone = 5 * 3
Workdone = 15 Nm
II. The name of the simple machine for "ramp” is an inclined plane.
Typically, an inclined plane has a flat supporting surface that is set at an angle with an end higher than the other and it can be used to lift or lower an object.
This mathematical model describes the changes that occur in a sample of
water as its temperature increases. Use this model to predict what will
happen to the motion of the molecules in a sample of water if the heat source
is removed.
200°C
vaporization
150°C
melting
100°C
Temperature (°C)
water vapor
50°C
liquid water
0°C
ice
-50°C
10
20
50
60
70
30 40
Time (min)
A. The molecules will stop moving.
B. The molecules will begin moving more quickly.
C. The molecules will begin moving more slowly.
D. The motion will change very little.
Answer:
the correct answer is B
Explanation:
The kinetic model of the movement describes that the movement of the molecules increases with the increase of their internal energy, which in a macroscopic sample is reflected in an increase in the temperature of the sample.
The sample graph shows the function of temperature over time, which is why our kinetic model establishes that there is an increase in the movement of water molecules.
Consequently the correct answer is B
Answer: C
Explanation:
The molecules will begin to move more slowly when the heat source is removed. When the heat is off, the water will begin to cool. Molecules in liquid water move more slowly. The molecules require less space and are closer to each other. And in ice, the molecules contain the least amount of heat energy, so the movement is very slow.
calculate the mass of air in a room if the floor dimensions are 10m × 12m and height is 400 cm the density of air is 1 .26 kg/M³ 3
Explanation:
first find the volume of room --->
[tex]v \: = 10 \times 12 \times (400 \times {10}^{ - 2} ) \times = 480 \: {m}^{3} [/tex]
then find the mass
[tex]mass \: = \: density \: \times \: volume \: = 480 \times 1.26 = 604.8 \: kg[/tex]
Which option best describes the increase in pressure when the volume of a plastic bottle decreases?
by a factor of 10
uneven
uniform
not at all
Answer:
B) uniform
Explanation:
We can solve this problem by using Boyle's law, which states that:
For a constant mass of an ideal gas kept at constant temperature, the pressure of the gas is inversely proportional to its volume.
Mathematically:
where
p is the pressure of the gas
V is its volume
If we apply the equation to the bottle in the problem, we see that:
- when the volume of the bottle (and therefore, of the gas inside) decreases, than the pressure will increase
- viceversa, when the volume of the bottle increases, the pressure will decrease
The amount by which the pressure increases is inversely proportional to the decrease in volume, so the answer depends on how the volume of the bottle decreases: however, if the volume of the bottle decreases uniformly, then we can say that the pressure inside the bottle will also increases uniformly.
MARK THIS ANSWER AS THE BRAINLIEST PLEASE ❤️
An increase in pressure of a plastic bottle uniformly decreases by a factor of ten when the volume decreases.
What is pressure?Pressure is defined as the force applied on an object perpendicular to it's surface per unit area over which it is distributed.Gauge pressure is a pressure which is related with the ambient pressure.
There are various units by which pressure is expressed most of which are derived units which are obtained from unit of force divided by unit of area . The SI unit of pressure is pascal .
It is a scalar quantity which is related to the vector area element with a normal force acting on it.It is distributed over solid boundaries and across arbitary sections of fluid normal to the boundaries at every point.Pressure and volume of gas are inversely proportional.
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for factors that affect capillarity
Which grouping describes only the living part of an ecosystem?
A. environment
B .niche
C. community
D. habitat
how much time does a stone take to reach on the surface of the earth drop from the height 20m and what will be it's acceleration due to gravity after 3 seconds
In all of the following examples, the quantity of the resource
being used by humans is affected EXCEPT–
A petroleum taken from the ground and burned for fuel.
B fresh water used for agriculture, recreation, and
tourism.
C wind power used to provide energy for homes and
businesses.
D metal ores mined and used to create building
materials.
Answer:
C wind power to provide energy for homes and businesses.
A pair of oppositely charged plates is separated by 0.09 m. A potential difference of
285 V exists between the plates. What is the electric field that exists between the plates?
Answer:
25.65 V/m
Explanation:
Applying,
V = Er................. Equation 1
Where V = Electric potential, E = electric field, r = distance of seperation.
make E the subject of the equation
E = V/r.............. Equation 2
From the question,
Given: V = 285 V, r = 0.09 m
Substitute these values into equation 2
E = (285×0.09)
E = 25.65 V/m
Hence the electric field between the plates is 25.65 V/m
A constant eastward horizontal force of 70 N is applied to a 12 kg crate
Answer:
Explanation:
If you are looking for acceleration, then F = ma, where F is the force, m is the mass, and a is acceleration. The direction is eastward and we will call that positive. Therefore,
70.0 = 12a and
a = 5.8 m/s/s
What are three reasons why nebulae contribute more to stellar formation than other regions of the universe?
Answer:
Nebulae contribute more to stellar formation than other regions because:
Explanation:
A.They have an unlimited supply of hydrogen.
B. They are believed to be rich in hydrogen and helium.
C. They have a three strong gravitational pull.
This are the reasons that Nebulae contribute more to stellar formation than other regions.
A ball has a mass of 0.25 kg and is moving to the right at 1.0 m/s. It hits a ball of mass 0.15 kg that is initially at rest. After the collision, the 0.15 kg ball moves off to the right with a velocity of 0.75 m/s. What is the final velocity of the 0.25 kg ball?
Answer:
here is your answer
Explanation:
here is your answer
weber is derived unit of ...........
Answer:
magnetic flux
hope this helps :))
Answer:
magnetic flux
Explanation:
Which is an example of potential energy? A. A car sitting at the top of a hill B. A fox chasing a mouse C. A kite flying in the air D. A bowling ball rolling
What is the force weight of a jaguar who jumps 3 meters to a tree branch with 2670 J of work?
Answer:
890 N
Explanation:
Given the following data;
Height = 3 m
Potential energy = 2670 J
To find the force weight;
We know that force = weight = mg
Potential energy can be defined as an energy possessed by an object or body due to its position.
Mathematically, potential energy is given by the formula;
[tex] P.E = mgh[/tex]
Where,
P.E represents potential energy measured in Joules.
m represents the mass of an object.
g represents acceleration due to gravity measured in meters per seconds square.
h represents the height measured in meters.
Substituting into the formula, we have;
2670 = mg*3
mg = 2670/3
mg = 890 N
Therefore, the force weight (mg) is equal to 890 Newton.
Pls help asap!
What is the focal length of a 3-inch f/7 mirror?
A. 0.43 inches
B. 2.3 inches
C. 21 inches
State the difference between viscosity and friction
Answer:
The main difference between friction and viscosity is that friction is used to refer to forces that resist relative motion, in general, whereas viscosity refers specifically to resistive forces that occur between layers of a fluid when fluids attempt to flow.
Explanation:
Answer:
Viscosity
Viscosity is defined as a measure of the resistance of a fluid, which is being deformed by either shear stress or tensile stress. In more common words, viscosity is the “internal friction” of a fluid. It’s also referred as the thickness of a fluid. Viscosity is simply the friction between two layers of a fluid when the two layers move relative to each other. Sir Isaac Newton was a pioneer in fluid mechanics. He postulated that, for a Newtonian fluid, the shear stress between layers is proportional to the velocity gradient in the direction perpendicular to the layers. The proportional constant (proportionality factor) used here is the viscosity of the fluid. The viscosity is usually denoted by the Greek letter “µ”. Viscosity of a fluid can be measured using Viscometers and Rheometers. The units of viscosity are Pascal-seconds (or Nm-2s). The cgs system uses the unit “poise”, named after Jean Louis Marie Poiseuille, to measure viscosity. Viscosity of a fluid can also be measured by several experiments. The viscosity of a fluid depends on the temperature. The viscosity decreases as the temperature is increased.
τ = μ (∂u / ∂y)
Viscosity equations and models are very complex for non-Newtonian fluids. It can be clearly seen that viscosity always acts in a direction, to oppose the flow of the liquid. Viscous forces are distributed throughout the volume of the liquid in a given dynamic condition.
Friction
Friction is probably the most common resistive force we experience every day. Friction is caused by the contact of two rough surfaces. Friction has five modes; dry friction that occurs between two solid bodies, fluid friction, which is also known as viscosity, lubricated friction, where two solids are separated by a liquid layer, skin friction, which opposes a moving solid in a liquid, and internal friction that causes the internal components of a solid to make friction. However, the term “friction” is most commonly used in place of dry friction. This is caused by the rough microscopic cavities on each of the surfaces fitting each other and refusing to move. The dry friction between two surfaces depends on the friction coefficient and the reactive force normal to the plane acting on the object. The maximum static friction between two surfaces is just a bit higher than the dynamic friction.
Explanation:
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Select the statement which are true for current, voltage and resistance:
A. As resistance increases, current also increases.
B. Current is directly proportional to voltage.
C. As resistance increases, current decrease.
D. If the voltage of a bulb is 12 V, and the resistance is 4 ohms, then the current must be 5 A.
Answer:
B.
Explanation:
Current is directly proportional to voltage and inversely proportional to the resistance.
The statement that is true is:
B. Current is directly proportional to voltage.
and
C. As resistance increases, current decreases.
A hydrometer is made of a tube of diameter 2.3cm.The mass of the tube and it's content is 80g. If it floats in a liquid density 800kg|m, calculate the depth to whc it sinks
Answer:
The depth to which the hydrometer sinks is approximately 24.07 cm
Explanation:
The given parameters are;
The diameter of the hydrometer tube, d = 2.3 cm
The mass of the content of the tube, m = 80 g
The density of the liquid in which the tube floats, ρ = 800 kg/m³
By Archimedes' principle, the up thrust (buoyancy) force acting on the hydrometer = The weight of the displaced liquid
When the hydrometer floats, the up-thrust is equal to the weight of the hydrometer which by Archimedes' principle, is equal to the weight of the volume of the liquid displaced by the hydrometer
Therefore;
The weight of the liquid displaced = The weight of the hydrometer, W = m·g
Where;
g = The acceleration due to gravity ≈ 9.81 m/s²
∴ W = 80 g × g
The volume of the liquid that has a mass of 80 g (0.08 kg), V = m/ρ
V = 0.08 kg/(800 kg/m³) = 0.0001 m³ = 0.0001 m³ × 1 × 10⁶ cm³/m³ = 100 cm³
The volume of the liquid displaced = 100 cm³ = The volume of the hydrometer submerged, [tex]V_h[/tex]
[tex]V_h[/tex] = A × h
Where;
A = The cross-sectional area of the tube = π·d²/4
h = The depth to which the hydrometer sinks
h = [tex]V_h[/tex]/A
∴ h = 100 cm³/( π × 2.3²/4 cm²) ≈ 24.07 cm
The depth to which the tube sinks, h ≈ 24.07 cm.
explain how a roller coaster functions using gravity and momentum. Why does it not need an engine or a motor to speed it up and slow it down?
Answer:
because it will help it go and funcion more
Explanation:
Answer:
It uses graivity and momentum because since we all know, gravity pulls things down, they have a chaint hat lifts the carts up, and then when it gets to a top, it releases it. When it goes down very high, it will go faster. Then it uses momentum when it goes up, then down again, or a loop to regain speed. IT doesn't need a engine or a motor to speed it up or slow it down because gravity and momentum is already doing the job a engine could. Like I said, when it is high in the sky and released, it goes down in incredible speed. And when it needs more speed to keep the ride going, it can add a loop or tight turns to increase it more.
There are two sets of resistors joined in series in a circuit. Set 1 has two resistors of 10Ω and 40Ω in parallel combination. Set 2 has three resistors of 20 Ω, 30 Ω and 60 Ω in parallel combination. A potential difference of 12 V is applied across the combination.
[tex]\huge\boxed{\fcolorbox{black}{red}{ QUESTION}}[/tex]
There are two sets of resistors joined in series in a circuit. Set 1 has two resistors of 10Ω and 40Ω in parallel combination. Set 2 has three resistors of 20 Ω, 30 Ω and 60 Ω in parallel combination. A potential difference of 12 V is applied across the combination.
[tex] \orange{\underline{\huge{\bold{\textit{\green{\bf{GIVEN}}}}}}}[/tex]
Two set of Parallel resistors
Contains two resistors of --> 10Ω and 40Ω
Contains three resistors of --> 20 Ω, 30 Ω and 60Ω
Potential Difference Of 12 V
[tex]{\bold{\orange {To \: Find }}}[/tex]
Draw a circuit diagram to represent this arrangement Calculate
(a) the total resistance and
(b) the total current flowing in the circuit.
[tex] \huge\mathbb{\red A \pink{N}\purple{S} \blue{W} \orange{ER}}[/tex]
FOR DIAGRAM REFER ATTACHMENT!
[tex]{\bold{\green{\star{\red {Part \: 1:- The \: Total \: Resistance }}}}}[/tex]
First we calculate the total resistance of each parallel combination:-
FIRST SET Contains two resistors of 10Ω and 40Ω
so total resistance-->
[tex] \frac{1}{Rs1} = \frac{1}{R1} + \frac{1}{R2} \\ \\ \frac{1}{Rs1} = \frac{R1 + R2}{R1R2} \\ \\ \frac{1}{Rs1} = \frac{10 + 40}{400} \\ \\ \frac{1}{Rs1} = \frac{50}{400} \\ \\ \frac{1}{Rs1} = \frac{1}{8} \\ \\ Rs1 = 8 Ω[/tex]
SECOND SET Contains three resistors of 20 Ω, 30 Ω and 60Ω
so total resistance-->
[tex] \frac{1}{Rs2} = \frac{1}{R1} + \frac{1}{R2} + \frac{1}{R3} \\ \\ \frac{1}{Rs2} = \frac{R1 + R2 +R3}{R1R2R3} \\ \\ \frac{1}{Rs2} = \frac{3+ 2 + 1}{60} \\ \\ \frac{1}{Rs2} = \frac{6}{60} \\ \\ \frac{1}{Rs2} = \frac{1}{10} \\ \\ Rs2 = 10Ω[/tex]
Now by having Total Resistance of Set one and set two we can add them by series formula.
[tex]R = Rs1 + Rs2 \\ R = 8 + 10 = 18 \: Ω[/tex]
[tex]{\bold{\green{\star{\orange{Part \: 2:- The \: Total \: Current \: Flowing \: In \: The \: Circuit. }}}}}[/tex]
Total Resistance of the circuit = 18 Ω
Potential Difference Of the circuit = 12 V
So Total current-->
[tex] V = IR \\ 12 = 18 \times I \\ \\ I = 0.66 \: A[/tex]
A 15.00 resistor and 7.00 resistor
are connected in parallel to an emf
source. A current of 1.50 A is in the 7.00
2 resistor. What is the potential
difference across the source?
The potential difference across the source will be 7.158 V.Ohm's law principle is applied.
What is ohm’s law?
Ohm's law claims that the voltage across a conductor is directly proportional to the current flowing through it.
An emf source is connected in parallel to the equivalent resistance of a 15.00 resistor and a 7.00 resistor is:
[tex]\rm \frac{1}{R_{eq}} =\frac{1}{R_1} +\frac{1}{R_2} \\\\ \rm \frac{1}{R_{eq}} =\frac{1}{15} +\frac{1}{7} \\\\ R_{eq} =4.77281 \ ohm[/tex]
This current-voltage connection may be expressed mathematically as, The Equation of ohm's Law
[tex]\rm E_{eq}=I_{eq}R{eq}\\\\ \rm E_{eq}= 1.50 \ A \times 4.772 \ ohm \\\\ E_{eq}= 7.158 \ V[/tex]
Hence, the potential difference across the source will be 7.158 V.
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[tex]what \: is \: reflection \: of \: light \: {?} [/tex]
Answer:
When a ray of light approaches a smooth polished surface and the light ray bounces back, it is called the reflection of light.
Answer:
The process of returning of a beam of light to the same medium after striking on a surface is called reflection of light .
hope it is helpful to you
how does Newton's law of motion describe when and how objects move?
Answer:
Newton's laws of motion relate an object's motion to the forces acting on it.Newton's first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force.
Explanation:
A 51-g rubber ball is released from rest and falls vertically onto a steel plate. The ball strikes the plate and is in contact with it for 0.5 ms.
The ball rebounds elastically and returns to its original height. The time interval for the round trip is 3.00 s. What is the magnitude of the
average force that the plate exerted on the ball?
2490 N
1500 N
2000 N
3500 N
3000 N
Answer:
F = 3000 N
Explanation:
Let's use the relationship between momentum and momentum
I = Δp
F t = m v_f - m v₀
As the body when bouncing reaches the same height from which it begins to fall, the modulus of speed is the same, but in the opposite direction,
v_f = - v₀ = v
F t = m 2v
F = 2 m v / t (1)
This is the contact time t = 0.5 ms = 0.5 10⁻³ s
Let's use the kinematics to find the velocity at the point of touching the plate, as the total travel time is 3.0 s, the descent time must be half the total time
t = 1.5 s
as the body solved its initial velocity is zero
v = v₀ + g t
v = g t
v = 9.8 1.5
v = 14.7 m / s
we substitute in equation 1
F = 2 0.051 14.7 / 0.5 10-3
F = 2,999 103 N
F = 3000 N
The average force that the plate exerted on the ball is 3,000 N.
The given parameters;
mass of the rubber ball, m = 51 g = 0.051 kgtime in contact, t = 0.5 mstime interval for rebound, Δt = 3 sThe velocity of the ball is calculated as follows;
[tex]v = g\Delta t\\\\v = 9.8 \times 3\\\\v = 29.4 \ m/s[/tex]
The average force that the plate exerted on the ball is calculated as follows;
[tex]F = \frac{mv}{t} \\\\F = \frac{0.051 \times 29.4}{0.5 \times 10^{-3} } \\\\F = 3,000 \ N[/tex]
Thus, the average force that the plate exerted on the ball is 3,000 N.
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How to write about Bar graph in english
Answer:
A bar chart is orientated horizontally, whereas a column chart is arranged vertically. Sometimes “bar chart” refers to both forms. These types of charts are usually used for comparison purposes (unlike line charts, which describe change).
PLEASE HELP
again this is about volleyball
Scenario: What happens when a player over-runs first base in a straight line and then is tug
with the ball?
• the player is ejected from the game
• nothing, they are allowed to do that
• the player is out
• the player gets to bat again
A student jumps from a flat surface with an initial velocity of 15ms. If the distance covered is 3m. What is the acceleration due to gravity and the time?
Answer:
the acceleration due to gravity, g is zero (0)
the time of the motion is 0.2 s
Explanation:
Given;
initial velocity of the student, u = 15 m/s
distance traveled by the student, x = 3 m
The motion of the student is directed towards the horizontal and the acceleration due to gravity, g is zero (0).
The time of the motion is calculated as;
x = ut + ¹/₂gt²
x = ut + ¹/₂(0)t²
x = ut
t = x/u
t = 3 / 15
t = 0.2 s
Therefore, the time of the motion is 0.2 s
