1. Choose the time interval with constant positive acceleration. (no calculations
needed)
A. 1 to 4 seconds
B. 7 to 9 seconds
C. 1 to 10 seconds
D. 4 to 5 seconds

Answer:

[tex]0.5\; {\rm m}[/tex].

Explanation:

The period [tex]T[/tex] of a wave is the reciprocal of its frequency [tex]f[/tex]. In other words, [tex]T = (1/f)[/tex]. Since the frequency of the wave in this question is [tex]f = 10\; {\rm Hz} = 10\; {\rm s^{-1}}[/tex], the period of this wave would be [tex]T = (1/f) = (1/10)\; {\rm s} = 0.1\; {\rm s}[/tex].

The wavelength of a wave is the distance its wavefront travels in one period [tex]T[/tex].

The period of this wave is [tex]T = 0.1\; {\rm s}[/tex]. At a speed of [tex]v = 5\; {\rm m\cdot s^{-1}}[/tex], it would have travelled a distance of [tex]v\, T = (0.1\; {\rm s})\, (5\; {\rm m\cdot s^{-1}}) = 0.5\; {\rm m}[/tex] within one period.

A Normal Force is a force applied in the direction perpendicular to the surface that the force is applied to. An example of this is putting pressure directly down on a table with your hand.

A Tension Force is a force applied in the opposite direction of the object the force is applied to. Tension Forces usually are applied by springs, ropes, and wires. An example of this is a wrecking ball hanging from a crane. There is a Tension Force on the wrecking ball holding it up in the air.

These forces are different from one another based on their directions that the forces are applied. Forces are vectors, so their magnitude is determined by the amount of force applied and their direction. Tension Force can be a Normal Force, but Normal Forces are not always Tension Forces.

Answer: As friction force is less than the Resultant

force so they will be able to move the fridge

Explanation:

     top view of fridge

Angle between forces B= 180- 70- (186-110 )

= 170 - 70 = 40 -

Resultant of forces .

R = 1 ( FOR + ( 82 ) 2 + 2 FIF2 COS B .

J (40B) " + ( 375 ) 2 + 2 x 400 * 375 x Cos 40 "

7 28 - 31 1 N .

() friction force = 600.

As friction force is less than the Resultant

force so they will be able to move the fridge

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There is 728.311N force acting on the front plane. while two individuals attempt to push a refrigerator. Pushing with a force of 400 N, one person is positioned with their back.

Angle between forces B= 180- 70- (186-110 )

= 170 - 70 = 40

R= [tex]\sqrt{(F1^{2} )+(F2^{2})+2F1F2cos\alpha }[/tex]

Here F1= 400

          F2=375

          alpha = 40

Resultant of forces .

728 . 31 1 N

friction force = 600.

friction force.

The refrigerator can be moved since the friction force is smaller than the resultant force.

Force's Definition. When an object interacts with another object, it experiences a push or pull that is known as a force. Every time two things interact, a force is applied to each of them.

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Answer:

Voltmeter

Explanation:

Voltmeter is used to measure both terminal potential difference as well as electromotive force (e.m.f.) depending upon the connection state of the battery or cell.

Instantaneous velocity and Average acceleration are vectors. Hence, the correct options are (I) and (II).

The instantaneous velocity is a quantity that shows us how quickly an object is moving at any point along its path. The time between the two events approaches zero when the average velocity between two points on the path reaches a certain limit. Instantaneous velocity is a vector with a dimension of length per time, similar to average velocity.

The rate at which the velocity changes is known as the average acceleration vector. It moves in the direction of the velocity change, v. The rate at which a velocity is changing over time is called acceleration. Acceleration is also a vector quantity and must take into account changes in both the magnitude and direction of a velocity. Because velocity has both magnitude and direction, it is referred to as a vector quantity.

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The time taken for the cd player to reach the full angular speed is 4 seconds.

The time of motion of the cd player is calculated by applying the following kinematic equation as shown below.

ωf = ωi + αt

where;

Since the cd player started from rest, the initial angular velocity = 0

The time taken for the cd player to reach the full speed is calculated as follows;

1600 = 0 + 440t

1600 = 400t

t = 1600/400

t = 4 seconds

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The statement that best describes how energy is conserved in this scenario is that the cold air absorbed energy from the water vapor, so it condensed and formed steam and the liquid water absorbed the energy of the fire, so it changed into a gas and evaporated. That is option B and D respectively.

The law of conservation of energy states that energy is neither created nor destroyed but can be changed from one form to another.

At the camping, energy from a lighter is being transferred to the wood and is being sustained by the chemical energy in the wood.

Upon the use of water to extinguish the fire, the liquid water absorbed the energy of the fire, so it changed into a gas and evaporated.

Also around the fire is the cold air which can absorb heat to form steam after condensation.

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According to Newton's Second Law, an object's net force is equal to the product of its mass and acceleration.

Force (F) can be computed from the 2nd Law of Motion using the following formula:

Fnet = ma( Equation 1 )

due to the fact that the problem did not specify it. We'll suppose the plane is flying straight up.

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Answer:

There traits are= understanding,fast thinkers,reliable/trustworthy,

Answer:

An effective team is a one where the team members, including the patients, communicate with each other, as well as merging their observations, expertise and decision-making responsibilities to optimize patients

Doing pull ups and when have a pause at up , there is almost entire body weight just except the weight of the hands.

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The Percentage error is zero.

Formula :-

Percentage error = V₀ - Vᵃ/ V₀ × 100%

V₀ = observed value, given = 3486 km

Vᵃ = accepted value, given = 3486 km

Hence, there is no difference between observed value and accepted value. So the Percentage error is zero.

Percentage error compares an estimate to a correct price and expresses the distinction among them as a percentage. This statistic permits analysts to recognize the scale of the error relative to the real fee. it's also known as percent errors and % error.

Percentage error is the difference between a measured or experiment value and an frequent or known price, divided by way of the known price, accelerated by using 100%.

Percentage error tells you ways large your errors are while you measure some thing in an experiment. Smaller values imply which you are near the well-known or actual fee. for example, a 1% error means that you obtain very close to the familiar value, at the same time as 45% method that you had been quite an extended manner off from the authentic price.

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The average force acting on the ball is biggest in the with the cement floor case 2 when in the collision the ball bounce back to half of its initial height.

It is asked that in which case the average net force on the ball is highest.

According to impulse-momentum theorem,

Impulse I = F.Δt

where, F is the net average force and Δt is the time of contact during the collision.

In the case of collision with the rubber piece the time of contact of the ball and the ball increases by large amount while in the case of cement floor the time of contact is very very less.

The change in momentum which is equal to the Impulse is also biggest in the case of cement floor because the transfer of kinetic energy of the ball in the case of cement floor will be almost immediate.

The Bigger change in momentum and the smaller time of contact makes the average force on the ball is biggest in the case of cement floor case.

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The force varies in magnitude is 1350 N.

We need to know about momentum to solve this problem. Momentum can be defined as the degree of difficulty to stop a moving object. It can be determined by

P = m . v

where P is momentum, m is mass and v is velocity.

Momentum depends on the Impulse, where

ΔP = I

m (v2 - v1) = F . t

where I is impulse, F is force and t is time

From the question above, we know that:

m = 0.5 kg

t = 24 ms = 0.024 s

v1 = 16 m/s

I = 32.4 Ns

Find the force applied

I = F . t

32.4 = F . 0.024

F = 1350 N

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The de Broglie wavelength for a particle== 0.92 ×10⁻³⁴m.

de broglie wavelength is the wavelength associated with particle of mass m moving with velocity v.

p= h/ λ

where, p -is  the momentum of the atom;

h- Planck's constant - 6.626×10⁻³⁴ m²kg s⁻¹

λ- wavelength;

Momentum can be expressed as

p=m×v

where , m is  the mass of the particle;

v - the speed of the particle.

so,

λ = h/(m×v)

= ( 6.626×10⁻³⁴ m²kg s⁻¹)/(1.2kg × 6.0 m/s)

= (6.626×10⁻³⁴ m²kg s⁻¹)/7.2

= 0.92 ×10⁻³⁴ m

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Seconds later, the amplitude of its momentum, p2, is equal to p1 + (F * Delta t).

A characteristic of an object in motion that it possesses as a result of its mass and motion and which, generally speaking, equals the product of the object's mass and velocity: a feature of an object in motion that determines how long it will take to bring it to rest when subjected to a constant force.

When a certain force is applied for a certain amount of time, a mass's velocity changes.

The following equation expresses this:

Eq. 1: Mass * Force * Time (Final velocity – Initial velocity)

Mass times speed equals momentum.

Eq. 2: Mass * Change in momentum (Final velocity – Initial velocity)

Set Eq1 = Eq2

Force x Time Equals Momentum Change

Equation 3: Final momentum - Initial momentum = Force * time

a mass m particle traveling along the x axis

The particle is being affected by the net force F along the x axis.

A constant force is F.

Eq. 1: Mass * Force * Time (Final velocity – Initial velocity)

Delta t = m * = F (Final velocity – Initial velocity)

Equation 3: Final momentum - Initial momentum = Force * time

p2 = p1 + (F * Delta t) = p2 - p1

Seconds later, the amplitude of its momentum, p2, is equal to p1 + (F * Delta t).

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Answer: Substance 3 is liquid at room temperature

Explanation: The common room temperature is assumed to be 20-22°C, we need to find the substance that will be in liquid state in that temperature.

For Substance 1, the boiling point is -195.975°C, and hence at room temperature, it would be in vapor phase and all liquid would have turned to gas.

For Substance 2, the boiling point is 3.85°C, and hence at room temperature, it would be in vapor phase and all liquid would have turned to gas in this case too.

For Substance 3, the boiling point is 77.85°C, and melting point is -108.15°C, hence at room temperature, it would be in liquid state.

For Substance 4, the melting point itself is 1800°C, due to which at room temperature it would be in solid state.

The speed of sound in water made by a torpedo with a speed of 20.00m/s and explodes upon impact with a target 2000.0m away is 19.72 m / s

v = d / t

v = Velocity

d = Distance

t = Time

d = 2000 m

t = 101.4 s

v = 2000 / 101.4

v = 19.72 m / s

Velocity of an object is the object's rate of change of position with respect to time. It is mostly denoted as m / s.

Therefore, the speed of sound in water is 19.72 m / s

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Car a is moving at va 60 km/h to the right with respect to the ground Car b is moving at vp 80 km/h to the right with respect to the ground. The Relative velocity of a car a with respect to car b is 20km/h .

rPS=→rPS′+→rS′S.r→PS=r→PS′+r→S′S.

The relative velocities are the time derivatives of the position vectors. Therefore,

→vPS=→vPS′+→vS′S.v→PS=v→PS′+v→S′S.

The velocity of a particle relative to S is equal to its velocity relative toS′S′plus the velocity ofS′S′relative to S.

We can extend (Figure) to any number of reference frames.

For particle P with velocities

→vPA,→vPB,and→vPCv→PA,v→PB,andv→PC in frames A, B, and C,

→vPC=→vPA+→vAB+→vBC.v→PC=v→PA+v→AB+v→BC.

We can also see how the accelerations are related as observed in two reference frames by differentiating

:→aPS=→aPS′+→aS′S.a→PS=a→PS′+a→S′S.We see that if the velocity of S′S′ relative to S is a constant,

then →aS′S=0a→S′S=0 and→aPS=→aPS′.a→PS=a→PS′.

This says the acceleration of a particle is the same as measured by two observers moving at a constant velocity relative to each other.

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Actual specific heat capacity would be less than the computed experimental specific heat capacity.

The experiment's measurement of water's specific heat capacity, c, is higher than the accepted value for c. This is because some heat was lost to the surroundings, causing the experimental temperature rise to be q smaller than the projected temperature rise.

The quantity of heat energy needed to raise the temperature of 1 kg of a material by 1 K is measured as specific heat capacity. It is crucial because it will show how much energy will be needed to raise or lower an object's temperature by a certain amount for a certain mass.

In this experiment, the primary source of error is heat loss by conduction. The conservation of energy serves as the theoretical foundation for this particular heat test. Energy can be in the form of heat, and in this instance, heat will be transported from the sample to the water.

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B. The pairs of vectors equal in direction only are one short and one long arrow going in the same direction.

The direction of a vector  can be defined as the measure of the angle it makes with a horizontal line.

The direction of a vector can also be described as the measure of the exact position on the x and y coordinate where a vector can be found.

When we describe the direction of vectors, we don't consider their size or magnitude, rather we focus on the angle of inclination of the vectors above the horizontal.

The magnitude of a vector is defined as the size of the vector.

Vectors pointing or going in the same direction have equal directions despite their size.

Vectors with equal size have the same magnitude despite their directions.

Thus, we can conclude that two vectors going in the same direction will have equal direction.

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Yes, it is true. The elevator moves upward because the acceleration is a positive number. If the acceleration is positive, the elevator will move higher.

Here, we can make use of Newton's second law of motion to find the acceleration.

Student mass equals 615/9.81, or 62.7.

The student's weight decreased and increased as a result on the scale.

ma = uarr F

645-615 = 62.7*a

a = 0.478m/s^2

The elevator moves upward because the acceleration is a positive number.

It is real.

The complete question is:

A 615 N student standing on a scale in an elevator notices that the scale reads 645 N.  From this information, the student knows that the elevator must be moving upward. True or false?

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In light of this, V=V 0 loge (r/r 0 ) Field E= dr dV =V 0(r0r) eE= r mV2 alternatively, reV0r0=rmV2. V=(m eV 0 r 0 ) \ s1 / 2mV=(m e V 0 r 0 ) 1/2 = constant mvr= 2 nh, also known as Bohr's quantum condition or Hermitian matrix.

Show that the eigenfunctions for the Hermitian matrix in review exercise 3a can be normalized and that they are orthogonal.  

Demonstrate how the pair of degenerate eigenvalues for the Hermitian matrix in review exercise 3b can be made to have orthonormal eigenfunctions.

Under the given Hermitian matrix, "border conditions," solve the following second order linear differential equation: d2x/ dt2 + k2x(t) = 0 where x(t=0) = L and dx(t=0)/ dt = 0.

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Answer:

K ≈ 1.10 × 10⁻¹⁸ J

Explanation:

Apply the Photoelectric Equation of Einstein:

h × f = K - W

Where:

h: Planck's constant = 6,62607015 × 10⁻³⁴ m². kg / s;

K: kinetic energy;

W: work function.

So:

h × f = K - W

6,63 × 10⁻³⁴ × 9.62 × 10¹⁴ = K - (2.90 × 1.6×10⁻¹⁹)

K = 6,63 × 10⁻³⁴ × 9.62 × 10¹⁴ + 2.90 × 1.6×10⁻¹⁹

K ≈ 1.10 × 10⁻¹⁸ J

A. The tension in the string being twirled around Fred's head is 247 N.

The centripetal acceleration of the rock twirled around Fred's head is calculated as follows.

a = ω²r

where;

The angular velocity of the rock = 5 rev/s x 2π rad/rev = 10π rad/s = 31.42 rad/s

Substitute the value of the angular velocity and radius of the circular path and calculate the centripetal acceleration.

a = (31.42)² x (0.5)

a = 493.6 m/s²

The tension in the string = ma

                                         = (0.5 kg) x (493.6 m/s²)

                                          = 246.8 N ≈ 247 N

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The complete question is below:

A string tied to a rock is being twirled around Fred's head at 5 cycles/s . If the rock has a mass of 500 g and the string is 50 cm long, what is the tension in the string?

The time period of simple pendulum is 2xpi x (l/g)^1/2  when derived by dimensional method.

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What thermonic emissions and liquid vaporization have in common is that the particles involved both processes evaporates by the application of heat.

The amount of heat energy which is needed by just 1 gram of a liquid substance to boil without being affected by change in temperature.

However, when the thermal liquid of vaporization decreases as temperature increases. It is also affected by intermolecular forces.

Thermonic emissions refers to those electrons which are produced by the application of heat energy.

In conclusion, the major similarity in the task above is that they evaporated by heat.

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Answer:

its c my brotha

because if the density decreases so will the mass less mass=less momentum

Answer: C

Explanation:pure substance is a single kind of matter that cannot be separated into other kinds of matter by any physical means

The correction should be made to Natasha's table is: Mixtures are substances that are not chemically combined.

When two or more separate chemical substances are combined without being chemically linked, the result is referred to as a mixture in chemistry. A mixture is the physically combined state of two or more distinct substances that can take the forms of solutions, suspensions, or colloids while retaining their identities.

Chemical components, such as elements and compounds, can be mechanically blended or mixed to create mixtures without causing any chemical bonding or other chemical change, preserving the unique chemical properties and makeup of each ingredient.

Physical qualities of a mixture, such as its melting point, may be different from those of its constituents even while there are no chemical changes to its constituents.

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Crest is the part of the wave which does this.

A sound wave is the sample of disturbance resulting from the movement of strength visiting through a medium, including air, water or every other liquid or stable remember as it propagates far from the supply of the sound.

The sound waves are generated by a sound source, such as the vibrating diaphragm of a stereo speaker. The sound source creates vibrations in the surrounding medium. because the supply continues to vibrate the medium, the vibrations propagate far from the supply at the rate of sound, hence forming the sound wave.

A sound wave is not a transverse wave with crests and troughs, however alternatively a longitudinal wave with compressions and rarefactions.

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