Answer:
(4) 8.5 m/s
Explanation:
You add both the meters together and both the seconds together and then divide them both.
Answer:
(4) 8.5 m/s
Explanation:
Total distance = 35 + 50 = 85m
Total time = 4 + 6 = 10sec
average speed = total distance/ total time
ave. speed = 85/10 = 8.5 m/s
A 0.413 kg block requires 1.09 N
of force to overcome static
friction. What is the coefficient
of static friction?
(No unit)
Answer:
Explanation:
The equation for this is
f = μ[tex]F_n[/tex] where f is the frictional force the block needs to overcome, μ is the coefficient of static friction, and [tex]F_n = w=mg[/tex] (that means that the normal force is the same as the weight of the block which has an equation of weight = mass times the pull of gravity). Filling in:
1.09 = μ(.413)(9.8) and
μ = [tex]\frac{1.09}{(.413)(9.8)}[/tex] so
μ = .27
The coefficient of static friction for the given block is equal to 0.27.
What is static friction?Static Friction can be defined as friction that is experienced by an object when it is placed on a surface. Kinetic friction can be defined as friction due to the movement of a body on a surface. The coefficient of static friction can be described as a scalar parameter and is denoted as μs.
The coefficient of static friction can be determined from the following expression:
[tex]\displaystyle \mu_s = \frac{F}{mg}[/tex]
Where F is the applied force, m is the mass of the object and g is the gravitational acceleration.
Given, the force acting on the block to overcome static friction = 1.09 N
The mass of the block, m = 0.413 Kg
The gravitational acceleration, g = 9.8m/s²
The coefficient of static fraction = 1.09/(0.413 ×9.8) = 0.27
Therefore, the coefficient of static friction is 0.27.
Learn more about static friction, here:
brainly.com/question/13000653
#SPJ2
is the outer electron in potassium more or less strongly attracted to the positive nucleus than the outer electron in sodium is?
Answer:
Less strongly attracted.
Explanation:
Potassium and sodium are both alkali metals. That means that they have the ability to be able to gather more valence electrons. They will both gain a positive particle. The potassium electron is less attracted because of the fact that now the sodium has a positive chargem and the electron has a negative charge.
Some giant ocean waves have a wavelength of 25 m and a frequency of
0.26 Hz. What is the wavespeed of such a wave? *
Answer:
Explanation:
The frequency equation for waves is
[tex]f=\frac{v}{\lambda}[/tex] where f is the frequency, v is the velocity, and lambda is the wavelength. Filling in:
[tex].26=\frac{v}{25}[/tex] so
v = .26(25) and
v = 6.5 meters/second
what is 6.39 times 10 to the 23rd power
Answer:
6.39*(10 to the 23rd)=
6.39*10²³
Which of the following is not true about gravitational fields?
They always pull, never push
They dominate the micro-universe (movements of molecules)
It pulls with field lines that can be thought of like ropes.
they dominate the macro-universe (movements of planets)
Answer:
The first one is wrong, they don’t push nor pull, it’s an invisible force that acts on everything equally
Explanation:
Hopes this helps
A bullet is fired at 660 ms and strikes a target 200 m away. How long has it
taken to hit the target?
Calculate the mass of a bus if it produces a force of 14,000 N while accelerating
at a rate of 5 ms 2 ?
You toss a ball at 30 ms' straight upward. How much time will the ball take
to reach the top of its path?
35
Answer:
Explanation:
The first question utilizes the one-dimensional equation
Δx = [tex]v_0t+\frac{1}{2}at^2[/tex] where Δx is the displacement of the bullet, v₀ is te initial velocity with which the bullet was fired, a is the acceleration in the horizontal dimension (which is always 0!), and t is the time in seconds. That's our unknown here. Filling in:
[tex]200.0=660t+\frac{1}{2}(0)t^2[/tex] and
200.0 = 660t so
t = .30 seconds
The second question is a simple application of Newton's 2nd Law which says force = mass times acceleration:
14000 = m(5.0) so
2800 kg = m
The third question is a bit more interesting. We will use the one-dimensional equation
[tex]v=v_0+at[/tex] where v is the final velocity of the ball (which is always 0 at the top of its projectile path!), v₀ is the initial velocity of the ball, a is the pull of gravity on the ball, and t is the time it takes to do this. Filling in:
0 = 30 + (-9.8)t and
-30 = -9.8t so
t = 3.1 seconds
How fast is lightening
Answer:
According to online, it shows that lightning can be traveling at 186,000 miles in only one second!
Hope it was helpful
1. A person walks 50 meters north, and then travels 150 meters to the south. What is the total distance they travelled? What is their displacement from their starting position?
Please help ASAP
Answer:
Total: 200 meters, Displacement: 100 meters South
Explanation:
First, add up the meters traveled to get the total distance.
50m + 150m = 200m
Lastly, displacement is the shortest distance from the initial position to the final position. The person first walked 50 meters north but then traveled 150 meters south. Therefore, their displacement was 100 meters south.
50m - 150m = -100m
(Note: Directions are vectors. North and East are positive vectors while South and West are negative)
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.
Learn more about pressure,here:
https://brainly.com/question/14760196
#SPJ6
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:
Select the correct answer.
Why does a solid change to liquid when heat is added?
ОА.
The spacing between particles decreases.
O B.
Particles lose energy.
Ос.
The spacing between particles increases.
OD
The temperature decreases.
Reset
N
Answer:
Ос.
The spacing between particles increases.
Heat causes greater particle activity, and the particles
are farther apart.
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:
PLS MARK ME BRAINLIEST
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.
