You push a block with your hand into the wall to hold it stationary. What are the direction of normal force and friction force respectively on the block?.
Answers
When you push a block with your hand into the wall to hold it stationary, the direction of the normal force and friction force respectively on the block are as follows: Direction of normal force: It is the force that is exerted perpendicular to the surface of contact between the block and the wall.
In this case, the normal force acts in the upward direction against the weight of the block. It is responsible for balancing the weight of the block and preventing it from sinking into the wall.
Direction of friction force:
It is the force that opposes the motion of the block and acts parallel to the surface of contact between the block and the wall.
The friction force acts in the backward direction opposite to the force applied by the hand on the block.
It is responsible for holding the block stationary and preventing it from sliding down the wall.
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Related Questions
The length of a hollow pipe is 297 cm. The
air column in the pipe is vibrating and has
five nodes.
Find the frequency of the sound wave in the
pipe. The speed of sound in air is 343 m/s.
Answer in units of Hz.
Answers
The frequency of sound in the pipe is 231 Hz.
What is the frequency of sound in the pipe?The frequency of sound in the pipe is calculated as follows;
N - N = λ/2
The total length of nodes, L = 4 (N - N) = 4 (λ/2)
L = 2λ
λ = L/2
The relationship between, frequency, speed and wavelength of sound is given as;'
f = v/λ
f = ( 343 m/s )/ (2.97 m / 2)
f = 231 Hz
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During anomalous expansion of water ,heat transfer is limited to conduction and radiation only ,explain.
Answers
Heat transfer is limited to conduction and radiation only in anomalous expansion of water simply because of the temperature at which the expansion occurs and density
What is anomalous expansion of water?Anomalous expansion of water is a property of water in which water expands instead of contracting.
Anomalous expansion of water makes water less dense. The major effect of this anomalous expansion it will still remain less dense and at the surface of water.Interestingly, this expansion occurs when it is cooled from 4°C to 0°C.Learn more about properties of water:
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Please help someone. A generator consumes 147 joules of energy in fuel and produces 75 joules of energy
in electricity. Engineers are challenged to produce a generator that is 20% more
efficient. Which of the following combinations of input and output energy represents a generator that has met this design challenge?
a. 150 joules of fuel to produce 90 joules of electricity
b. 135 joules of fuel to produce 68 joules of electricity
c. 60 joules of fuel to produce 100 joules of electricity
d. 115 joules of fuel to produce 82 joules of electricity
Answers
Answer:
A
Explanation:
Current effiency
= 75/147
= 0.5102
New Efficiency
= 120/100 × 0.5102
= 0.6122
Only option A satisfies this efficiency.
What is an abyssal fan
Answers
Answer:
Abyssal fans, also known as deep-sea fans, underwater deltas, and submarine fans, are underwater geological structures associated with large-scale sediment deposition and formed by turbidity currents
Explanation:
They are underwater deltas and submarine fans, they are associated with large scale sediment, and formed by turbidity currents.
Help ASAP please ASAP
Answers
Answer:
the anwser you are looking for is B
Explanation:
Water
Wood
Neon gas
Arrange the substances in the table from the MOST to the LEAST ordered particle arrangement
A)
wood, water, neon gas
B)
wood, neon gas, water
water, wood, neon gas
D
water, neon gas, wood
Answers
Answer:
I think the correct answer from the choices listed above is option A. The correct arrangement of the substances according to the most to the least ordered particle arrangement should be wood, water and neon gas. Wood should be the first since it is solid which has the most ordered structure as compared to the liquid and a gas. The neon gas is the last since as a gas it has the least ordered structure.
Answer:
A) wood, water, neon gas
Explanation:
wood, water, neon gas.
The particles of solids have an arrangement that is highly ordered and regular. Liquids have an arrangement that is less ordered, and the particle arrangement in gases is the least ordered and regular of the three states of matter.
tell me if im wrong .... hope this helps :)
9.00 V is applied to a wire with aresistance of 52.0 2. At what distancefrom the wire is the imagnetic field2.22 x 10-8 T?
Answers
Answer:
1.56 m
Explanation:
First, we need to find the current in the wire, so we will use the following equation:
\(V=IR\)Where V is the voltage, R is the resistance and I is the current. Replacing the values and solving for I, we get:
\(\begin{gathered} 9V=I(52\Omega) \\ \frac{9V}{52\Omega}=I \\ 0.17A=I \end{gathered}\)So, the current is 0.17 A.
Now, the magnetic field generated by a wire with current I at a distance r is equal to:
\(B=\frac{\mu I}{2\pi r}\)Where μ is 4π x 10^(-7). So, replacing the values and solving for r, we get:
\(\begin{gathered} (2.22\times10^{-8})=\frac{(4\pi\times10^{-7})(0.17)}{2\pi r} \\ (2.22\times10^{-8})r=\frac{(4\pi\times10^{-7})(0.17)}{2\pi r}\cdot r \\ (2.22\times10^{-8})r=\frac{4\pi\times10^{-7}(0.17)}{2\pi} \\ (2.22\times10^{-8})r=3.4\times10^{-8} \\ \frac{(2.22\times10^{-8})r}{2.22\times10^{-8}}=\frac{3.4\times10^{-8}}{2.22\times10^{-8}} \\ r=1.56\text{ m} \end{gathered}\)Therefore, the distance is 1.56 m
20.) In an experiment that measures how fast a student reacts, a meter stick dropped
from rest falls 0.20 meter before the student catches it. The reaction time of the student approximately
a)0.30s
b)0.20s
c)0.10s
d)0.40s
Answers
The reaction time of the student is approximately 0.2 s (Option B)
How do I determine the reaction time of the student?Considering the question given above, the following formula can be use to obtain the time
h = ½gt²
Where
h is the heightg is the acceleration due to gravityt is the timeNow, let us calculate the reaction time of the student. This is shown below:
Height (h) = 0.20 meterAcceleration due to gravity (g) = 9.8 m/s²Reaction time (t) = ?h = ½gt²
0.20 = ½ × 9.8 × t²
0.20 = 4.9 × t²
Divide both side by 4.9
t² = 0.20 / 4.9
Take the square root of both side
t = √(0.20 / 4.9)
t = 0.2 s
Thus, the reaction time is 0.2 s (Option B)
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You calculated a equivalent capacitance of 0.72 μF ± 0.08 μF. If the manufacturer has labeled the capacitor as 0.5 μF ± 10%, is this consistent with your result?
Answers
To determine if the manufacturer's label is consistent with your calculated equivalent capacitance of 0.72 μF ± 0.08 μF, we need to compare the ranges of the values.
1. Determine the manufacturer's label range:
The manufacturer labeled the capacitor as 0.5 μF ± 10%. To find the range, we will calculate 10% of 0.5 μF.
0.5 μF * 10% = 0.05 μF
The range of the manufacturer's label is 0.5 μF ± 0.05 μF, meaning it could be between 0.45 μF and 0.55 μF.
2. Determine your calculated range:
You calculated the equivalent capacitance as 0.72 μF ± 0.08 μF. This means your calculated range is between 0.64 μF and 0.8 μF.
3. Compare the ranges:
Manufacturer's range: 0.45 μF to 0.55 μF
Your calculated range: 0.64 μF to 0.8 μF
Since there is no overlap between the two ranges, the manufacturer's label of 0.5 μF ± 10% is not consistent with your calculated result of 0.72 μF ± 0.08 μF.
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as it goes around a horizontal curve whose radius is 150 m, your 1250 kg automobile is slowly picking up speed. the coefficient of static friction between the tires and the road is 0.800. at what speed will the car begin to skid sideways?
Answers
Speed will the car begin to skid sideways is 34.3m/s
Centripetal force is the force that causes an object to follow a curved path. Its direction is always orthogonal to the fixed point of the body's motion and the instantaneous center of curvature of the path.
Given;
Radius(R)=150m
Mass(m)=1250Kg
Static Friction(μs)=0.8
Calculation:
Here the necessary centripetal force is exerted by frictional force
mv^2/R=μmg
v=sqrt(μRg)
v =sqrt(0.8*150*9.8)
v =34.29m/s=34.3m/s
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C) explain why David's average speed is less than his top speed.
Answers
Answer:
Explanation:
His top speed is a blip that occurs for less than the full time he was out. Below is a graph showing what he did from 1 o'clock to 9. He was walking from 1 to the point where starts walking faster and then back down again to 2. The line at 2 is longer than the triangular shape that shows where he speeded up. Then he went back down to 2 and continued at that speed until 9.
Obviously he spent more time at 2 than he did at 4 and therefore his average speed will less than the 4 speed.
Remember that average speed = total distance / total time.
in a binary star system consisting of two stars of equal mass, where is the gravitational potential equal to zero?
Answers
In a binary star system consisting of two stars of equal mass, the gravitational potential is equal to zero at the barycenter.
The barycenter is the center of mass of the two stars and is the point around which they orbit each other. It is the point where the gravitational forces of both stars cancel out, resulting in a net gravitational force of zero.
The barycenter is often located closer to the more massive star, but in a binary system with equal masses, it would be located halfway between the two stars.
This point is important for understanding the dynamics of the binary system, as it determines the path of each star's orbit around the other. The barycenter is also used to study exoplanets and their orbits around their host stars.
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after the switch is closed, which plate of the capacitor eventually becomes positively charged?
Answers
After the switch is closed, the plate of the capacitor that eventually becomes positively charged depends on the configuration of the circuit. There are two possible configurations: series and parallel.
Series Configuration:In a series configuration, the capacitor is connected in series with a voltage source (such as a battery) and a resistor. When the switch is closed, current begins to flow through the circuit. Initially, the capacitor behaves like a short circuit, and no voltage is present across it. However, as time passes, the capacitor charges up and develops a potential difference across its plates. In this case, the plate connected to the positive terminal of the voltage source becomes positively charged, while the other plate remains negatively charged.
Parallel Configuration:
In a parallel configuration, the capacitor is connected in parallel with a voltage source and a resistor. When the switch is closed, current flows through the resistor, but the voltage across the capacitor remains constant. Initially, the voltage across the capacitor is equal to the voltage of the source. As the capacitor charges, the plate connected to the positive terminal of the voltage source becomes positively charged, while the other plate remains negatively charged.
Therefore, in both series and parallel configurations, the plate connected to the positive terminal of the voltage source eventually becomes positively charged. The charge on the capacitor builds up gradually until it reaches its maximum value determined by the voltage source and the capacitance of the capacitor.
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help me please (*￣(ｴ)￣*)
Answers
Answer:
1) Are always conservative
Explanation:
Elastic forces are always conservative.
Hope it helps you.
please mark as the brainliest answer.
1. If a rock is dropped from a height and hits the ground in just 1 second, the speed at impact is 10 m/s. What would
happen to the speed if it is dropped from a higher height?
a. Its final speed would remain the same because its rate of acceleration would remain the same.
b. Its final speed would increase because the acceleration due to gravity remains the same.
c. Its final speed would remain the same because its rate of acceleration would decrease.
d. Its final speed would increase because the acceleration due to gravity would decrease.
Answers
the voltage used by most households can be modeled by a sine function. The maximum voltge is 120 volts, and there are 60 cycles every second. Write an equation to represent the value of the voltage as it flows through the electric wires, where t is time in seconds
Answers
The required equation for the sine function can be written as; V = 120sin120πt
What is a sine function?A sine function is a regular repeating function. We know that the voltage is represented using a sine function of the general form V= V-o sin2πft
Hence;
f = 60 cycles per second
V-o = 120 volts
So from the values that we have stated above;
V = 120sin120πt
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what is the horizontal distance dforearm between the elbow and the point where the weight of the forearm acts?
Answers
The horizontal distance (d_forearm) between the elbow and the point where the weight of the forearm acts is known as the center of mass of the forearm.
The center of mass represents the average position of the weight distribution of an object. In the case of the forearm, this point is important in biomechanics as it helps determine the force exerted by the muscles and the stability of the arm during various movements. To find the center of mass, one can use various techniques including mathematical calculations, experimental measurements, and observation of the anatomy.
Generally, the center of mass for the human forearm is located approximately at the midpoint between the elbow and the wrist, making it roughly 50% of the total length of the forearm. However, this location may vary among individuals due to differences in body proportions, muscle mass, and bone density. In summary, the horizontal distance (d_forearm) between the elbow and the point where the weight of the forearm acts is the center of mass, typically located around the midpoint of the forearm, this point plays a significant role in the biomechanics and stability of the arm during various movements.
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Which phenomenon supports the particle model of light?
A. The photoelectric effect
B. Constructive interference
C. Destructive interference
O D. Diffraction
Answers
Answer:
The photoelectric effect
The photoelectric effect supports the particle model of light. Hence option A is correct.
What is photoelectric effect ?When a substance absorbs electromagnetic radiation, a process known as the photoelectric effect causes electrically charged particles to be discharged from or inside the material. When light strikes a metal plate, the action is frequently described as the ejection of electrons from the plate. In a more general definition, the substance may be solid, liquid, or gas, the radiant energy may take the form of infrared, visible, or ultraviolet light, X-rays, or gamma rays, and the discharged particles may include ions (electrically charged atoms or molecules) in addition to electrons. Because of the perplexing concerns it presented about the nature of light—particle versus wavelike behavior—that were eventually answered by Albert Einstein in 1905, the phenomenon was critically important in the development of modern physics.
Hence option A is correct.
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Use the H-R diagram below to list the following three main-sequence stars in order of increasing mass: the Sun, Spica, and Barnard's star.
Answers
The Sun is a G-type main-sequence star, commonly referred to as a yellow dwarf. It has a mass of about 1.989 x 10^30 kilograms. As the closest star to Earth, the Sun serves as the reference point for stellar classifications and properties.
Spica is a binary star system located in the constellation Virgo. The primary star, Spica A, is a B-type main-sequence star. B-type stars are typically more massive and hotter than the Sun. Therefore, Spica A has a higher mass than the Sun.
Barnard's Star is a red dwarf located in the constellation Ophiuchus. It is one of the nearest stars to the Solar System, but it is relatively faint and dim. Red dwarfs are smaller and less massive than the Sun, so Barnard's Star has a lower mass compared to both the Sun and Spica.
Therefore, the order of increasing mass for the three main-sequence stars you mentioned would likely be:
Barnard's Star < The Sun < Spica
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As a freely falling object picks up downward speed, what happens to the power supplied by the gravitational force?.
Answers
The power supplied by the gravitational force will increase because (Power=work/time).
What happens to a freely falling object's speed as it descends?A falling object gains momentum as it descends.
An increase in air resistance is caused by a speed increase.
At some point, the force of air resistance grows strong enough to counteract the pull of gravity.
Since there is no net force at this point, the object will stop accelerating.
Although the direction and magnitude of velocity fluctuate, the acceleration caused by gravity remains constant and downward.
The ball has zero velocity at the highest point in its trajectory, and it picks up speed as it descends back toward the earth.
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magnesium plus iron sulphate
Answers
Answer:
what is the ❓❓❓⁉️⁉️⁉️⁉️
1. Light traveling through air (n = 1.000293) strikes an ice cube (n = 1.309) at a 30° angle, Determine the angle at which the light refracts when it enters the ice cube.
Answers
Answer:
The angle at which light bends or refracts as it passes from one medium to another is given by Snell's law, which states that the ratio of the sines of the angles of incidence and refraction is equal to the ratio of the indices of refraction of the two media:
n1 sin(θ1) = n2 sin(θ2)
where n1 and n2 are the indices of refraction of the two media, θ1 is the angle of incidence, and θ2 is the angle of refraction.
In this problem, we are given that light is traveling through air with an index of refraction of n1 = 1.000293 and strikes an ice cube with an index of refraction of n2 = 1.309 at an angle of incidence of θ1 = 30°. We are asked to find the angle of refraction θ2.
Substituting the given values into Snell's law, we get:
1.000293 sin(30°) = 1.309 sin(θ2)
Solving for sin(θ2), we get:
sin(θ2) = (1.000293 / 1.309) sin(30°) = 0.5033
Taking the inverse sine of both sides, we get:
θ2 = sin^(-1)(0.5033) = 30.22°
Therefore, the angle at which the light refracts when it enters the ice cube is approximately 30.22°.
What is the wavelength of a sound wave with a frequency of 50 Hz and a speed of 340 m/s?
Answers
Heya!!
For calculate wavelength, lets applicate formula:
\(\boxed{\lambda = V/f}\)
Δ Being Δ
f = Frequency = 50 Hz
v = Velocity = 340 m/s
\(\lambda\) = Wavelenght = ?
⇒ Let's replace according the formula:
\(\boxed{\lambda = 340\ m/s / 50 \ Hz }\)
⇒ Resolving
\(\boxed{\lambda = 6,8\ m}\)
Result:
The wavelength is 6,8 meters.
Good Luck!!
the specific heats of several metals are given in the table. if the same number of joules were applied to the same mass of each metal, which metal would show the greatest temperature change?
Answers
The specific heat of a substance is defined as the amount of heat energy required to raise the temperature of one unit of mass of the substance by one degree Celsius (or one Kelvin).
As a result, given the same level of energy input, the material with the smallest amount of specific warmth will experience the largest temperature change. We can see through the table of metal specific heats that copper, exhibiting a value of 0.385 J/g°C, is the metal with the smallest specific heat.
So, among the metals presented in the table, metal would experience the largest rise in temperature whether the same quantity of joule were put to the identical amount of each metal.
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Correct Question:
The specific heats of several metals are given in the table. if the same number of joules were applied to the same mass of each metal, which metal would show the greatest temperature change?
A small object is placed in front of a concave mirror gives real image and image is 4 times the object. When the object is moved towards the mirror, a virtual image of same magnification is formed. Find the focal length of the mirror.
Answers
The focal length of the mirror, when the object is moved towards it and a virtual image is formed is calculated to be -4u/3.
We know that,
magnification, m = height of image, v
height of the object, u
given in the question, m = 4
as the mirror is concave, thus:
v= -4u
Now, by using the mirror formula:
1/(-f) = 1/ v + 1/u
(as the image formed is virtual, the focal length of the mirror will be negative)
1/(-f) = 1/(-4u) + 1/u
-1/f = 3/4u
f= -4u/3
Concave mirrors create both physical and virtual images. When the concave mirror is put very close to the object, a virtual and enlarged image is generated; as the distance between the item and the mirror increases, the size of the image decreases, and genuine images are formed. These real-world photographs can be displayed on a screen. The concave mirror's focal point and center of curvature are located in front of the mirror.
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A radio frequency identification application would most likely interface with a (an):_________
Answers
A radio frequency identification application would most likely interface with an Operational Data Store.
The Operations Data Store (ODS) is a central database that provides the latest data snapshots from multiple transaction systems for operational reporting.
It allows organizations to combine data in its original format from various sources into a single destination to provide business reporting.
ODS contains integrated updates from operational sources and supports business intelligence (BI) tools to facilitate tactical decision making.
For example, an administrator can configure ODS to pull weekly batches of data from a billing application that is rarely updated, importing individual transaction records as they occur in the sales database(thanks to these database triggers), then combine the two into new relational tables.
As a result, querying and reporting on operational data in ODS comes with the assurance that these integrated tables contain the latest and most relevant snapshots of the business.
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An object is NOT accelerating. Is its motion changing?
Yes or No?
Answers
Answer:
Acceleration is 0. Acceleration is the change in velocity over time, so if acceleration is 0, the change in velocity is 0 no matter how much time passes. THIS DOES NOT MEAN VELOCITY IS 0. it only means that velocity is constant. In other words, the speed of motion will not change
Explanation:
Which of the five criteria that define minerals explains why polymorphs are actually different minerals?
Answers
Cender
Quarter
Coin
Feldr
And round
31) A box is pushed, up a ramp, at constant velocity with a force of 14 N.
What is the magnitude of the friction force working on the box? *
Answers
The magnitude of the frictional force working on the box is 14 N.
According to Newtons's first law, an object will continue in its state of rest or state of uniform motion unless it is acted upon by an unbalanced force. This means that motion or acceleration is caused by an unbalanced force.
Since the box is moving at constant velocity, the frictional force on the box and the force that moves the box forward are exactly equal in magnitude but opposite in direction.
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please answer me fast
Answers
Answer: i think c
Explanation:QA: “What is ordinary glass made of ?”
Glass is mostly silica, or silicon dioxide, present as quartz in many types of sand. Pure silica forms a highly transparent glass, but has a very high melting or softening temperature, around 1700°C. Even at such high temperatures it is highly viscous and difficult to work. Its use is largely confined to applications requiring high transparency to ultra-violet and infra-red radiation, stability at elevated temperatures or low thermal expansion coefficient.
“Ordinary glass” windows and drinking vessels are typically made from soda-lime glass, containing silica with around 25% sodium, calcium and other oxides, which together reduce the softening temperature to roughly 500–600°C