When bucket is originally empty, then the scale reads after water starts to accumulate in it is T = 18.97 N.
What is net force?The net force is defined as the vector sum of forces acting on a particle or object. The net force is a single force that replaces the effect of the original forces on the motion of particle.
After 3.50 seconds, bucket contains 0.91 L of water, which has mass of 0.760 kg same as the bucket. The total mass m of the bucket and the water is 0.91 + 0.760 = 1.67 kg.
So, the gravitational force F,
As, F = mg = (1.67)(9.81) = 16.738N
There is an additional downward force resulting from the momentum of the water being poured and every second, there is 0.260 L = 0.260 kg of water hitting the bottom of the bucket.
Since water falls without splashing, this implies means we can neglect the height of the water that is already in the bucket, and just say that it has fallen full distance of x = 3.80 m.
After falling that distance, water will reach a velocity of sqrt(2gx) = 8.63 m/s
So, force W will be the change of momentum over time,
We know, W = mv/t
= (0.260 kg) (8.63 m/s) / 1 s
= 2.24 N
Total force, T = F + W
= 16.738 + 2.24
T = 18.97 N
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at the instant a ball is thrown horizontally with a large force, an identical ball is dropped from the same height. ((ignore air resistance) which ball hits the ground first? * 1 point captionless image a)the horizontally thrown ball b)the dropped ball c)neither - they both hit the ground at the same time
Both the balls hit the ground at the same time.
What is free fall?A body is said to be in freefall when it only moves in relation to the Earth's gravity. An external force exerted on the ball will cause its motion to accelerate. Gravitational acceleration is another name for this rate of free fall.
Due to the fact that the horizontally thrown ball's vertical motion is fully independent of its horizontal motion, both will strike the ground at the same time. As a result, both balls appear to be dropped and descending vertically at the same time in terms of vertical motion.
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acceleration is generally defined as the time rate of change of velocity. when can it be defined as the time rate of change of speed? group of answer choices when moving in a straight line, the time rate of change of speed is called velocity. when moving in a circle, the time rate of change of speed is always zero. when moving in a circle, the time rate of change of speed is called average speed. when moving in a straight line, the time rate of change of speed is acceleration.
When we are moving in a straight line, velocity the time rate of change of speed is acceleration.
Velocity can be described as a vector measurement of the charge and path of motion. Placed truly, speed is the velocity at which something moves in one course. The velocity of an automobile travelling north on a chief parkway and the velocity of a rocket launching into the area can each be measured using speed.
The distinctive styles of velocities are uniform speed, variable velocity, common pace and immediate pace. Uniform velocity: when a body is stated to be shifting with uniform speed if its average pace among any two factors along its course is equal in importance as well as path.
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what is the minimum speed that the bucket must swing so that the bucket does not come crashing down at the top of its loop
The minimum speed that the bucket must swing so that the bucket does not come crashing down at the top of its loop is v = [tex]\sqrt{rg}[/tex]
Fc = Fg
mac = mg
ac = g
ac = v^2/r
v^2/r = g
The pace at which the distance a moving item travels changes is measured as speed. Since speed is a scalar, it has magnitude but no direction as a unit of measurement.
Speed is the rate at which anything moves over a predetermined distance.
an object that moves quickly and with high speed, covering a lot of ground in a short time. A slow-moving object with a low speed, on the other hand, covers a comparatively short distance in the same amount of time. An item with zero speed is stationary.
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Out of the following muscle fiber types, the fastest muscle contraction would be produced by a:
type IIx fiber.
type I fiber.
type IIa fiber.
type III fiber.
The fastest muscle contraction would be produced by a type IIb fibers.
Although Type IIB fibers are designed to produce ATP through anaerobic metabolic pathways, they can't provide enough ATP to the skeletal muscle fibers constantly and get tired quickly. have a rapid contraction velocity and ATP production. The muscles of the arms include a lot of these fibers. The "traditional" fast-twitch muscle fibers that are best at delivering short, intense bursts of speed are those that produce energy through anaerobic metabolism.
That type IIB fiber, which predominates in tiny mammals, is absent in large mammals, including humans, is a significant distinction. The most fatigue-prone and quickly contracting subtype of fast fibers is Type IIB. For type II muscle fibers, there is a range of slow to high contraction speeds.
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1. If the velocity of an object changes from 20 m/s to 50 m/s over the course of 5
seconds, what is its acceleration?
2. if the velocity of an object changes from 40 m/s to 10 m/s over a time interval of 2
seconds what is its average acceleration? Help please
The accelaration is 15 ms.
What is accelaration?Acceleration (a) is the reason that change in velocity (Δv) over to the change in time (Δt).
represented by the equation to a = Δv/Δt. This allows you to measure how fast velocity by the changes in meters per second squared (m/s^2).
1 . Here the change in to the velocity is (50-20) or 30 m/s
And the time interval by to the 5
So acceleration is 30/5 or 6 ms^-2
2. Here the change is the (40-10) or 30 m/s in time is the interval is 2 second
So acceleration is 30/2 or 15 ms^-2.
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How could you use a magnet to gather evidence that magnetic fields and electric currents have a causal relationship?
Move the magnet through loops of wire
Move the magnet around a compass
Place a magnet close to a generator
Place a magnet close to a motor
Answer:
Move the magnet through loops of wire.
Explanation:
See person? that wasn't so hard its litteraly easier to put in an actual answer instead of all that spam.
One way to use a magnet to gather evidence that magnetic fields and electric currents have a causal relationship is to move the magnet through loops of wire that are present in the first option.
What is the relationship between magnetic fields and electric currents?The relationship between magnetic fields and electric currents is known as electromagnetic induction. and electromagnetic induction states that a changing magnetic field induces an electric current in a nearby conductor, and a changing electric current induces a magnetic field around the conductor, and this relationship is the foundation for the operation of many electrical devices, such as generators, motors, transformers, and induction heaters, among others.
Hence, the correct answer is to move the magnet through loops of wire that is the first option.
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jasmine fell on her arm during a tennis match. when the trainer examines jasmine, she asks jasmine if she can turn her arm in a way that allows her to show the trainer the palm of her hand. what type of motion would this movement most accurately demonstrate?
The motion that the movement of jasmines arm accurately demonstrate circular motion.
What is circular motion?A circular motion is a movement or rotation of an object around the circumference of a circle. It can be uniform, with a constant angular rate of rotation and speed, or non-uniform, with a variable rate of rotation.A net inward or "centripetal" force is required for circular motion. In fact, if the forces are balanced, a moving object will continue to move in a straight line at a constant speed.Circular motion can be classified as either uniform or non-uniform. In uniform circular motion, the angular rate of rotation and speed are constant, whereas in non-uniform motion, the rate of rotation changes. During circular motion, the velocity vector changes direction at each point on the curve.To learn more about circular motion refer to :
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if 8.0 mg of a radioactive substance naturally decays to 0.50 mg over 184 days, what is the half-life of the radioisotope?
According to the given statement 46 days is the half-life of the radioisotope.
What is radioisotopes used for?An unstable chemical element that releases radiation as it breaks down and becomes increasingly stable. Both the natural environment and a laboratory can produce radioisotopes. They are used in medical imaging research and therapy.
Briefing:A radioactive substance's half life can be predicted by:
Nt = No(1/2)^(t/th)
Nt is the amount remaining (mg)
No is the initial amount (mg)
t is the time elapsed, in days
th is the half life in days.
Nt = No(1/2)^(t/th)
0.50mg = (8.0mg)(1/2)^(184 days/th)
We can resolve this for Th using logs.
th = 46 days
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28102 a flat coil of wire consisting of 480 turns, each with an area of 70 cm, is positioned perpendicularly to a uniform magnetic field that increases its magnitude at a constant rate from -0.8 t to -0.75 t in 7.7 s. if the coil has a total resistance of 86 , what is the magnitude of the induced current when the field is -0.775 t?
The magnitude of current when a flat coil of wire consisting of 480 turns each with an area of 70 cm, is positioned perpendicularly to a uniform magnetic field that increases its magnitude at a constant rate from -0.8 t to -0.75 t in 7.7 s. if the coil has a total resistance of 86 is 0.025 A.
Given that magnetic flux is expressed as = NBA in this situation,
we know that N = number of turns and B = magnetic field.
We now know that the rate of change in magnetic flux will cause EMF in the coil, hence A = area of the loop.
EMF = NBA db/dt
Now, enter all variables to calculate the induced
EMF: (480)(70 * 10-2). [(-0.75) -(-0.8)]
According to Ohm's rule, current equals EMF divided by resistance, hence I = 2.18/86
I = 0.025 A
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a mass spectrometer can analyze molecules having masses of hundreds of proton masses. if the singly charged ions of these molecules were produced using the same accelerating potential difference as used for smaller ions, how would the mass spectrometer's magnetic field have to
The passage of ions through a potential difference V accelerates them. Parallel plates are connected by a voltage, and tiny amounts of ions are then injected into the space between them, close to the plate that already has a charge of the same sign as the ions.
What purpose does the magnetic field serve in a mass spectrometer?Using a bending magnet, the magnetic sector mass spectrometers: The ions or atoms are forced to bend when they enter the magnet, and the light ions bend more sharply than the heavy ions. As a result, they are separated into a spectrum, like a rainbow.
What type of mass spectrometry makes use of magnetism?Dempster's spectrometer only used a magnetic field to deflect the ion beam in a 180° arc. In Dempster's device, an ion beam that was homogeneous in mass and energy but diverging from a slit could be brought to a direction focus.
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A wave with a wavelength of 3 m travels with a frequency of 450 Hz. What is its speed? Answer quickly.
The speed of a wave with a wavelength of 3m and frequency of 450Hz is 1350 meters per seconds.
How to calculate the speed of a wave?Wavelength is simply the distance over which the shapes of waves are repeated. It is the spatial period of a periodic wave.
It is expressed as;
λ = c ÷ f
Where c is speed, f is frequency and λ is wavelength.
Given the data in the question;
Wavelength λ = 3mFrequency f = 450 Hz = 450 s⁻¹Speed c = ?Plug the given values into the above formula and solve for speed v.
λ = c ÷ f
c = λ × f
c = 3m × 450s⁻¹
c = 1350 ms⁻¹
Therefore, the speed of the wave is 1350m/s.
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sven has also reached the finals of a strength competition and has to pull a city bus as far as he can. one end of a rope is attached to the bus, while the other end is tied around sven's waist. the rope is perfectly horizontal during the pull. during his pull, sven transfers 5000 joules of energy to the bus in the form of work. while sven is pulling, a rolling friction force of 1920 n also acts on the bus over a distance of 2.19 meters. if the bus started at rest, what is the bus' kinetic energy (in joules) at the moment before sven stops pulling?
The bus' kinetic energy (in joules) at the moment before sven stops pulling is 1195.2 Joules.
The energy associated with an object’s state of motion is Kinetic energy is a scalar quantity that is never negative in value and formula is K.E = 1/2mv^2.
The kinetic energy for the x, y, and z components are additive, Kinetic energy is relative to the motion of observer’s reference frame, since speed and velocity are as well.
An object’s kinetic energy depends more on its speed than its mass. Any change in an object’s speed will affect a change in its kinetic energy.
Given,
Frictional force (f) = 1920 N
Distance Cover (x) = 2·19 m
Then energy loss due to frictional force = fx
= 1920 × 2.19
= 4204.8 J
Energy apply by Sven is 5400 J
Rest of the energy. Kinetic is used to increase the kinetic energy of bus. So kinetic energy of the bus = 5400-4204.8
= 1195.2 J
When sven stops pullin, bus's kinetic energy is = 1195.2 J
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a force of 15n is used to push a box along the floor distance of 3 meters. find the amount of work done
Answer:
to find the amount of work done, you need to calculate the force applied to the box times the distance over which it is applied. In this case, the force applied to the box is 15N and the distance over which it is applied is 3 meters, so the amount of work done is 15N * 3m = 45N*m.
Explanation:
It's important to note that work is a scalar quantity, not a vector quantity. This means that it has only magnitude and no direction. The direction of the force applied to the box and the direction of the displacement of the box are not relevant in calculating the amount of work done.
Important Formulas:
[tex]w=Fd[/tex]
work(measured in joules) = force(measured in newtons) * distance(measured in meters)
__________________________________________________________
Given:
[tex]F=15N[/tex]
[tex]d=3m[/tex]
[tex]w=?[/tex]
__________________________________________________________
Finding work:
[tex]w=Fd[/tex]
[tex]w=15\times3[/tex]
__________________________________________________________
[tex]\fbox{w = 45J}[/tex]
hyrum is at a concert when a flute player hits a very high note at the end of a song. which of the following best explains why the pitch of the note sounds so high? responses it has a long wavelength and high frequency. it has a long wavelength and high frequency. it has a short wavelength and high frequency. it has a short wavelength and high frequency. it has a long wavelength and low frequency. it has a long wavelength and low frequency. it has a large amplitude. it has a large amplitude. it has a small amplitude.
Its high frequency and brief wavelength The best explanation for why the note's pitch seems so high is what follows.
Which theory best explains why different people respond to the same stimuli differently?concept of signal detection. some people react differently to the same stimulus is explained by the signal detection theory. The experience, expectations, motivation, and alertness of an individual are a few variables that explain these variations.
What produces high or low sound?Pitch. Depending on how quickly an object vibrates, a different sound is produced. High-pitched sounds are produced when something vibrates quickly. Things that vibrate more slowly produce low-pitched sounds.
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for the oscillation of a simple pendulum, the time for the mass moving from the left-most to the equilibrium position is 0.5 s. find the length of the pendulum (in m)
The length of the pendulum (in m) is : 0.99m
Time period to reach from left most position to equilibrium position = 0.5s =t
Time period is defined as the time taken to complete one full oscillation
T = 0.5*4 = 2s
for sample pendulum
T = 2π[tex]\sqrt{\frac{l}{g} }[/tex]
2 = 2π[tex]\sqrt{\frac{l}{9.81} }[/tex]
l = 0.99m
The period of the pendulum does not depend on the mass of the sphere, only on the length of the chord. Two pendulums with different masses but the same length have the same period. Two pendulums of different lengths have different periods. A pendulum with a long string has a long period
A simple pendulum consists of a sphere (mass point) m suspended from a (massless) cord of length L and fixed at a pivot point P. When shifted to the initial angle and released, the pendulum swings back and forth in a periodic motion. Applying Newton's second law to a rotating system gives the equation of motion for a pendulum.
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An experiment is reliable if it O measures what it is supposed to measure O can be replicated by another researcher and provide similar resultsO can accurately predict future behaviors O proves the research hypothesis wrong
It is supposed to be replicated by another researcher and provide similar results predict future behaviors proves the research hypothesis.
This is because, an experiment is considered reliable if different researchers repeats it and even then get the same or a similar answer over and over again. So, it suggests that the experiment is reliable, when it tends to give the same result when other researchers repeat the entire experiment.
An explanation for a phenomenon is offered in the form of a hypothesis, or hypotheses. According to the scientific method, a hypothesis must be testable in order to qualify as a scientific hypothesis. Typically, scientists base their hypotheses on prior observations that leave room for doubt on the validity of the existing body of knowledge. A scientific theory is different from a scientific hypothesis, despite the fact that the terms "hypothesis" and "theory" are frequently used interchangeably. In a process that starts with an educated guess or notion, a working hypothesis is a hypothesis that has been accepted provisionally and is offered for additional study.
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A truck is facing down a slope of 5°. The truck has a mass of
3000 kg. The driver lets of the brake and the truck accelerates
down the slope. What is the acceleration of the truck?
What is the acceleration as a vector in component form?
The acceleration of the truck is 0.85 m/s².
The acceleration of the truck in vector form is → 0.85 m/s²
What is the acceleration of the truck?The acceleration of the truck is determined as follows;
Acceleration = Total force/mass of truck
The total force acting on the truck is the net force
The net force = mg sinθ
where
θ is the angle = 5°
Net force = 3000 * 9.8 * sin 5°
Net force = 2562.4 N
Acceleration = 2562.4 / 3000
Acceleration = 0.85 m/s²
The vector form of the acceleration will be → 0.85 m/s².
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plane a is flying at 350 mph in the northeast direction relative to the earth. plane b is flying at 460 mph in the north direction relative to the earth. what is the direction of motion of plane b as observed from plane a?
Plae A is flying at 350mph in the northeast direction relative to the earth, meanwhile plan B is flying at 460mph in the north direction. Plane B is observed as it is flying in the northwest direction as observed from plane A.
When the two planes are flying, the speed of the objects are measured relatively to the sureface of the earth are the actual speed of the object.
To solve this case, we will use the relative velocity concept. The relative velocity defines the velocity of an object relative to another object. In this case, we want to know the velocity of Plane B relative to Plane A.
To find the relative velocity of plane B to plane A,we could use formula:
v(BA)² = v(B)² + v(A)² - 2.v(A).v(B).cos45°
where:
v(BA) = velocity of plane B relative to plane A
v(B) = actual velocity of plane B
v(A) = actual velocity of plane A
cos45° = cos of the angle between plane B and plane A's direction
Using the information given, we found that:
v(BA)² = 460² + 350² - 2(460)(350).cos45°
v(BA) ²= 106,411
v(BA) = 326.21 mph
Plane B will be seem as flying with 326.21mph to northwest direction relative to plane A.
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a car with good tires on a dry road can decelerate at about 5.0 m/s2 when braking. suppose a car is initially traveling at 55 mi/h. (a.) how much time does it take the car to stop? (b.) what is the stopping distance?
4.92s is the time, it takes for the car to stop.
60.47m is stopping distance, also called as deceleration.
What is deceleration and kinematic equation?
Deceleration is acceleration that takes place opposite to the direction of velocity. Here velocity always decreases.
Kinematic is study of motion without considering physical properties and forces acting on them. Kinematic equation deals with variables that are associated with kinematic namely, displacement, time, velocity and acceleration.
Thus to calculate time and deceleration, kinematic equation is used.
Calculation:a) From question vi=55mph = 24.6m/s and f=5.0m/s²
Therefore, vi-vf/f =t
t=24.6-0/5
t=4.92s
Thus, tie required to stop the car is 4.92s
b) Δx = vf²-vi²/2a
where vf= 0m/s (final speed)
vi= 55mi/h ≈ 24.59m/s (initial speed)
a=-5m/s² (deceleration)
Δx=0²-25.59²/-2.5≈60.47m
Thus, 60.47m is the stopping distance
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0.2kg gingerbread man is resting on a table. What is the normal force applied by the table onto the gingerbread man?
The normal force applied by the table onto the gingerbread man is 1.96 N.
What is normal force?
The normal force is a type of force that is felt when a surface pushes against an object that is placed on that surface.
In other words, a normal force is a type of force directed opposite to the weight of an object. The normal force of an object is always directed upwards while the weight of the object is directed downwards.
According to Newton's third law of motion, the magnitude of the normal force of an object acting upwards is always equal to the weight of the object acting downwards.
The normal force applied by the table onto the gingerbread man is calculated as follows;
Fn = mg
where;
m is the massg is acceleration due to gravityFn = 0.2 kg x 9.8 m/s²
Fn = 1.96 N
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part e the sum of the electrical and magnetic energies in an l - c circuit is 0.800 j . at a certain instant the energy is exactly half electrical and half magnetic, the capacitor charge is 5.30 mc , and the current is 8.00 a . find the capacitance.
The magnetic energy that is created around the inductor is where this energy is actually kept. Again, think about the circuit we created with two coils wound on base of one another.
The electrical energy is created by the motion of negative charge to and fro and this flow of electrons create electrical energy.
Given,
sum of magnetic and electric energy = 0.800 J
Capacitor charge = 5.50 mc
Current = 8 A
V = 10
Capacitance = 8 * 10 = 80
Therefore the capacitance of the energized capacitor is 80 F
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calculate the angle for the third-order maximum of 605 nm wavelength yellow light falling on double slits separated by 0.105 mm.
The angle for third order maximum is [tex]0.481^{\circ}[/tex] .
Given that, wavelength of yellow light is 605-nm. Distance between the slits on which the light is falling is 0.105 mm.
The angle for the the third order maximum can be calculated by the formula given below.
[tex]m \lambda=2 d \sin \theta[/tex]
where, λ is the wavelength of light, is the distance between the slits and is the order of diffraction.
For the third order,[tex]m=3[/tex].
Substituting the values in the above formula, we get the angle for the third order maximum.
[tex]\begin{aligned}& 3 \times 605 \times 10^{-9}=2 \times 0.105 \times 10^{-3} \times \sin \theta \\& \sin \theta=\frac{3 \times 605 \times 10^{-9}}{2 \times 0.105 \times 10^{-3}}\end{aligned}[/tex]
Simplifying the above equation as,
[tex]\begin{aligned}& \sin \theta=0.0084 \\& \theta=\sin ^{-1}(0.0084) \\& \theta=0.481^{\circ}\end{aligned}[/tex]
Hence, the angle for third order maximum is [tex]0.481^{\circ}[/tex].
What is the wavelength?
A quality of a wave that is the distance between similar points between two continually waves is called wavelength.
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A certain brand of freezer is advertised to use 880 kW*h of energy per year.
A) Assuming the freezer operates for 6 hours each day, how much power does it require while operating? P= ?
B) If the freezer keeps its interior at a temperature of -6.0?C in a 20.0 ?C room, what is its theoretical maximum performance coefficient? K= ?
C) What is the theoretical maximum amount of ice this freezer could make in an hour, starting with water at 20.0 ?C?
A certain brand of freezer is advertised to use 880 kW*h of energy per year, thus values are:
(A) P = 401.82 W
(B) K = 10.26
(C) m = 35.52 kg
What is maximum performance coefficient?Both a thermal Carnot efficiency and a Carnot coefficient of performance exist. The temperatures of the system's hot and cold reservoirs affect its maximum coefficient of performance.
(A)
Use the relation between power and energy to calculate the require power to operate engine.
The required power for the freezer to operate is:
P = E/t
E = Energy and t = time
The freezer operates for 6 h each day, and then in 1 year, the freezer operates for a time period is:
t = (365 days) × (6 h /1 day)
or, t = 2190 h
Thus, P = E/t
or, P = (880 Kw.h/ 1 year) × (10³ W / 1 KW) × (1 year/2190 h)
or, P = 401.82 W
Therefore, the required power is: 401.82 W
(B)
The theoretical maximum performance co-efficient is:
K = T(C) / [T(H) - T(C)]
or, K = (-6°C +273)/[(20°C + 273) - (-6°C +273)]
or, K = 267 K / 293 K - 267 K
or, K = 10.26
Therefore, the theoretical maximum performance co-efficient is: 0.26
(C)
The heat needed to make 1 kg ice is:
Q = m×[c(water)]×ΔT +mL
Here, specific heat of water [c(water)], heat of fusion of water L.
Q = m×[c(water)]×ΔT +mL
or, Q = (1 kg) × (4190 J/kg.K) × (293K - 273K) + (1 kg) × (334 × 10³ J/Kg)
or, Q = 417800 J
The heat of removal is,
Q(removal) = WK
or, Q(removal) = PtK
or, Q(removal) = (401.82 W) × (3600 sec) × (10.26)
or, Q(removal) = 14841623.52 K
Mass of the ice is,
m = Q(H) /Q
or, m = 14841623.52 Ws / 417800 J
or, m = 35.52 kg
Therefore, the mass of the ice is: 35.52 kg
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the latent heat for the water/steam transition is 2256 kj/kg, i.e., to convert 1 kg of water into steam requires 2256 kj. what is the latent heat per molecule of h2o? express your answer in joules and in ev.
H2O molecules have a latent heat of 124976.7 J/mol when expressed in joules. This is comparable to about 124976 electron volts. 7 J/mol equals 7.2 1020 eV.
Why do electron volts exist?When an electron accelerates in an electromagnetic current created by a one volt potential difference, it gains kinetic energy, which is measured in electron volts.
How many volts are there in an electron?The meaning of an electron energy (eV) is The amount of kinetic energy that an electron gains or loses when it goes from rest across a potential of one volt is known as an electron or electron-volt. Energy is measured in electron volts. 1.602176634 10-19 J is the equivalent of one electron volt.
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for a projectile with initial velocity of 40.9 m/s and angle of elevation equal to 6 degrees. compute the horizontal velocity of the projectile in m/s. 40.6759 m/s compute the vertical velocity in m/s.
The horizontal and vertical components of the velocity are 41.1 m/s and 389 m/s respectively.
The initial velocity of the projectile = 40.9 m/s
The angle of elevation = 6°
The horizontal and vertical components of the velocity can be found using the formula,
Horizontal component, cosθ = v/vₓ
Vertical component , sinθ = v/vₙ
where θ is the angle of the elevation
v is the initial velocity
vₓ and vₙ are horizontal and vertical components of the velocity respectively.
Let us substitute the known values in the above equation. We get
Horizontal component:
cos 6° = v / vₓ
0.961 = 40.9 / vₓ
vₓ = 40.9/0.995
= 41.1 m/s
Vertical component
sin 6° = 40.9 / vₙ
0.105 = 40.9 / vₙ
vₙ = 40.9 / 0.105
= 389 m/s
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in the absence of clothing between the barrel of a gun and the person being shot, about how far away does the shooter have to be in order to leave no soot or stippling around the gun shot hole?
Stippling is a cutaneous condition brought on by unburned gunpowder fragments. Stippling cannot be removed with water, in contrast to other things that may be deposited on the skin, such as soot. Stippling suggests that when the gun was discharged, it was less than two feet from the victim's body.
Stippling in gunfire is what?
Stippling is the term used to describe the occurrence of numerous punctate skin abrasions brought on by foreign objects contacting the skin's surface. 1. Gunpowder tattooing, also known as gunpowder stippling, refers especially to stipple marks left behind by gunpowder when it leaves a gun.
What does forensic stippling mean?
Stippling is the term used in forensic science to describe a pattern of gunshot wounds left on the skin as a result of being in close contact to a discharged weapon. Stippling is a technique used in gunsmithing to engrave designs on the grip of a firearm to increase friction and provide a more secure grip.
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Consider the net work required to stop a moving object. a) What is the net work, in joules, required to stop a crate of mass 72 kg that is moving at a speed of 1.89 m/s? b) What is the net work, in joules, required to stop a bullet of mass 6.1 g that is moving at a speed of 470 m/s?
A mass-containing crate must stop with a net effort of 24.63 joules.
When a physical influence called force is imparted to an item, the object accelerates in the direction the force was applied from. The amount of matter that makes up an object is expressed by its mass, which is expressed in kilograms. The rate at which an object's velocity along the same straight line as the unbalanced force changes is known as its acceleration.
Force and Mass
According to the question,
Mass, m = 72 kg
Speed, v = 1.89 m/s
Acceleration due to gravity, g = 9.8
We know,
The force, F = mg
By substituting the values,
= 72×1.89
= 136.08 N
By using Equation of motion,
v² = u² + 2gS
(1.89)² = 0 + 2ₓ 9.81 S
3.57 = 19.62 S
S = 3.57 / 19.62
S = 0.181 m
hence,
The work done (W) will be:
= F × S
= 136.08 ₓ 0.181
= 24.63 joule
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Research on interviewing has shown the importance of
O keeping a straight face and making small talk.
O self-promotion and smiling.
O making limited eye contact and not smiling too much.
O leaning back and making eye contact.
Performance evaluations that include personal reviews and input from peers, supervisors, customers, and others are known as
O summative appraisal.
O 360-degree feedback appraisal.
O multi-modal feedback.
O job satisfaction survey
Interview refers to an official face-to-face meeting of monarchs or other important figures.
It can also be a conversation in person (or, by extension, over the telephone, internet etc.) between a journalist and someone whose opinion or statements he or she wishes to record for publication, broadcast etc.
One importance of interview, which research has successfully pinpointed, is the control of facial expressions such as smiling gestures, posture etc.
360 degree feedback is an evaluation system or process in which employees receive confidential, anonymous feedback from the people who work around them. This typically includes the employee's manager, peers, and direct reports.
The 360 degrees Performance Appraisal method was first used in the 1940s. The 360 method provides each employee the opportunity to receive performance feedback from his or her supervisor, peers, staff members, co-workers and customers in an anonymous fashion.
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I wooden table was placed on a wooden floor having a mass of 10 K to the table was pushed by 10N and did not move
Answer:
Explanation:
A wooden table with a mass of 10 kg was set on a wooden floor and pushed with a force of 10N to the table, however, it did not move due to friction.
Because the force of friction was greater than the force given to the object, it did not move.
To move the box, the force applied should be more than 10N
a coal barge 1000 ft long and 100 ft wide is submerged a depth of 12 ft in water. it is being towed at a speed of 5 ft/s. estimate the friction drag on the barge (in lbf). water density
A 1000 foot long by 100 foot broad coal barge is submerged in 12 feet of 60 degree water. Estimate the friction drag if the vehicle is being pulled at 12 mph. It is being dragged at a 5 ft/s speed.
What is friction drag?
The water density of the barge's friction drag. In 60 feet of water, a coal barge that is 1000 feet long and 100 feet wide is submerged. It is being towed at a 12 mph speed. A flat-bottomed barge that was 80 feet long and 35 feet broad was submerged. A 1000 foot long by 100 foot wide coal barge is immersed in water that is 12 feet deep. It is being dragged at a 5 ft/s speed.
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