Tracy stands on a skateboard and tosses her backpack to her friend who is standing in front of her. Which best describes the acceleration Tracy experiences?

It is less than the acceleration of the backpack because she has a greater mass. It is greater than the acceleration of the backpack because she has a greater mass. It is less than the acceleration of the backpack because she uses a smaller force. It is greater than the acceleration of the backpack because she uses a larger force. Which is an action/reaction force pair? Check all that apply. Earth pulls on a book, and the book pushes against a shelf. A hockey stick hits a puck, and the puck pushes against the stick. A pencil pushes against a piece of paper, and the paper pushes against the desk. A finger pulls on a rubber band, and the rubber band pushes against the finger. A dog pulls on a leash, and the owner pulls back on the leash.

Answer:

1- How to Calculate Power?
ans; power is defined as " work done per unit time"
therefore calculated by P= Work/time.
2- What is the units of Power?
Ans; It is watt denoted by "W"
3- Write a solved example?
Ans; Lets say we move a block from One place to another by using 10joules in 4 seconds.
so put values
P=work/time
P=10/4
P=2.5

Explanation:

The best description of the image produced by a flat mirror is:"The image formed by a flat mirror is virtual, upright, and laterally inverted."

When an object is placed in front of a flat mirror, the mirror reflects the light rays from the object. The reflected rays appear to originate from behind the mirror, creating a virtual image. The image appears upright, meaning it has the same orientation as the object. However, the image is laterally inverted or reversed from left to right compared to the actual object.

The virtual image formed by a flat mirror has the same size as the object, as there is no magnification involved. The image appears to be located the same distance behind the mirror as the object is in front of it.

It is important to note that the image produced by a flat mirror is not formed by the convergence or divergence of light rays but by their reflection.

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Which describes the image distance I for the image produced by a flat plane mirror?

Weight of the person = m*(g+a) = 932.2 N

Weight of the person = m*(g+a) = 774.2 N

Weight of the person = m*(g+a) = 695.2 N

A diagram or pictorial depiction that organizes the representation of data or values is known as a graph. The relationships between two or more objects are frequently represented by the points on a graph.

The four most common types of graphs are probably line graphs, bar graphs and histograms, pie charts, and Cartesian graphs. They are frequently and effectively used for a variety of purposes. You would use: Numbers that are unconnected to one another are displayed using bar graphs.

A) at 1 sec acceleration a = (4-0)/(2-0)

                                          \(= 2\ m/s^{2}\)

Weight of the person = m*(g+a)

                                    = 79*(9.8+2)

                                    = 932.2 N

B) at t = 4 sec

Acceleration a = 0

Weight of the person = m*(g+a)

                                   = 79*(9.8+0)

                                   = 774.2 N

C) at t = 8 sec

       a = (0-4)/(10-6)

         \(= -1 m/s^2\)

Weight of the person = m*(g+a)

                                    = 79*(9.8-1)

                                    = 695.2 N

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Answer:

 α = 2.13 10⁻⁵ C⁻¹    ,  the closest material is ALUMINUM

Explanation:

The expression for thermal expansion is

          ΔL = α L₀ ΔT

temperatures are

         ΔT = 85 - 10 = 75 ° C

the length of the rod is L₀ = 125 m and L_f = 125.20 m

        ΔL = 125.20 - 125 = 0.20 m

        α = \(\frac{1}{L_o} \frac{\Delta L }{\Delta T}\)

        α = \(\frac{ 1}{125} \ \frac{0.20 }{75}\)

        α = 2.13 10⁻⁵ C⁻¹

When reviewing the table, the closest material is ALUMINUM

Answer:

hmm...

Explanation:

Answer: wave a has the higher ampllitude while wave b has the lower amplitude.

Explanation:

wave a has the amplitude of 4 while wave b has the amplitude of one

The sign of (a) the work interaction and (b) the heat interaction for an electric adapter for a notebook computer (converting 110 volts to 19 volts) operating 10°C warmer than the surrounding temperature is positive.

Similarly, the adapter is releasing heat into the surrounding environment, so the heat interaction is also positive.
The sign of the interactions in this situation can be determined by examining the direction of energy transfer.

(a) Wext: In this case, the electric adapter is doing work on the notebook computer by converting the 110 volts to 19 volts. Therefore, the sign of Wext is positive (1).

(b) Q: The electric adapter is operating 10°C warmer than the surrounding temperature, which means that it is transferring heat to the surroundings. Therefore, the sign of Q is negative (-1).

Overall, the sign of Wext is positive (1) and the sign of Q is negative (-1) in this situation.

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The volume and mass of a cylindrical object with a uniform rectangular cross section of b x 2b and a density of p/3, where p is the density of water, may be computed.

as follows: r2 * h = volume where r denotes the cylinder's radius and h its height. r2 * h * (p/3) = Mass = Volume * Density Because the cylinder's cross section is a rectangle with dimensions b x 2b, the radius of the cylinder may be determined as r = (b / 2). Substituting this into the volume equation yields: Volume = * (b/2)2 * (h) And the mass equation is as follows: * (b/2)2 * h * (p/3) = mass We may use these equations to compute the volume and mass of the cylindrical object. Given the size of its cross section and its density in relation to water.

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Answer:

V = 220 [V]

Explanation:

In order to solve this problem we simply need to replace the given values of current and resistance in the expressions proposed.

R = 22 [kΩ] = 22000 [Ω]

I = 10 [mA] = 0.01 [A]

Voltage (V)

\(V = 0.01*22000\\V = 220 [V]\\\)

Today, astronomers can measure distances directly to worlds like Venus, mars, the moon, or the satellites of Jupiter by bouncing radar beams off them.

The reproduction and display of 3D pictures is another use for parallax. The secret is to take two 2D pictures of the subject from slightly different angles, just like human eyes do, and to show them so that each eye only sees one of the pictures.

For instance, a stereopticon, or stereoscope, a popular gadget from the 19th century, employs parallax to display images in three dimensions. Through a set of lenses, two photographs that have been put next to one another are seen. Each image is captured from a slightly varied angle that nearly resembles the distance between the eyes. The images on the left and right respectively depict what the left and right eyes would see.

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Answer:

\(v_{f}=63\ \frac{m}{s}\)

Explanation:

\(v_{f}=v_{i}+a\cdot t\)

\(v_{f}=15\ +\ 6\cdot8\)

\(v_{f}=63\ \frac{m}{s}\)

Therefore, the speed of the car is 63m/s after 8 seconds while accelerating at it maximum capability.

According to given data the volume of the unknown sample is 52. 5 mL - 47. 0 mL = 5.5 ml.

One typical style of lab glassware is graduated cylinders. They are a long, cylindrical vase with graduations marking the volume of liquid they can hold. Spouts are frequently included to make pouring easier.

Your graduation will go down in history as a significant event; it will stand for development, change, and embarking on new experiences. Celebrate your accomplishments thus far and be grateful for the memories this phase of your schooling has provided you.

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The sound is a physical wave that travels through the air and is propagated by air molecules colliding with each other and transmitting the energy of those collisions.

The louder the sound, the greater the intensity of the wave, which is usually measured in decibels (dB).

The intensity of the sound of the siren can be calculated using the formula:

I = (P/4πr²) where I is the intensity, P is the power of the siren, and r is the distance from the siren. We can assume that the power of the siren is constant, so we can rearrange the formula to solve for P:

P = I × 4πr²

Plugging in the values from the problem, we get:

P = (10^(120/10) W/m²) × 4π(2.0 m)²

P = 10,000 W

The power of the siren is 10,000 watts.

The siren is a powerful device that can produce a very loud sound. The intensity of the sound decreases as the distance from the siren increases, so it is important to mount the sirens on high towers to ensure that the warning can be heard from a distance.

The use of sirens as a warning system is a critical part of the safety infrastructure in Hawaii, where the risk of tsunamis is high.

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Answer:

A straight line with no slope.

Answer:

C on edge 2021

Explanation:

Answer:

E=mc△T

E=0.012(4200)(99-98)

E=50.4J

50.4 joules of heat is used

Option A, which states that the wavelength of peak solar emission would shift to a shorter wavelength, is the correct answer.

If the average temperature of the sun increased, the wavelength of peak solar emission would shift to a shorter wavelength. This is because the temperature of the sun is directly proportional to the wavelength of peak solar emission. As the temperature increases, the energy emitted by the sun shifts towards shorter wavelengths.

This phenomenon is known as Wien's displacement law. According to this law, the wavelength of maximum emission is inversely proportional to the temperature of the emitting body. So, if the temperature of the sun increases, the wavelength of peak solar emission would shift towards the shorter end of the spectrum.

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In a fire piston, the temperature of the gas inside the piston increases due to adiabatic compression.

In physics, pressure is a measure of the force per unit area that a fluid (liquid or gas) exerts on its surroundings. It is defined as the force F acting perpendicular to a surface divided by the area A over which the force is distributed: pressure = F/A. The SI unit of pressure is the Pascal (Pa), which is defined as one Newton per square meter (N/m²). Other common units of pressure include pounds per square inch (psi), atmospheres (atm), and bar (bar). Pressure is an important concept in many areas of physics, including fluid mechanics, thermodynamics, and atmospheric science. It describes the behavior of fluids in pipes and channels, the operation of hydraulic systems, and the behavior of gases in sealed containers. The pressure of a fluid is related to its density and temperature, and can be influenced by factors such as gravity, elevation, and the motion of the fluid itself.

Here,

When the piston is rapidly pushed down into the cylinder, it compresses the gas inside the cylinder. This rapid compression causes the gas molecules to collide with each other more frequently and with greater force, which in turn increases the temperature of the gas.

Because the compression is adiabatic (i.e., no heat is allowed to enter or leave the system), the increase in temperature is due solely to the work done on the gas by the piston. This increase in temperature is known as adiabatic heating.

The fire piston is a simple but effective tool for starting a fire in the wilderness, and it demonstrates the principles of adiabatic compression and the relationship between pressure, volume, and temperature in a gas.

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Answer:

The slit width a, must be equal to the wavelength λ

That is, every point on one side of the slit must have a corresponding point that is 180 degrees out of phase on the other side of the slit so the corresponding point on the screen receives no light,

This condition is also known as the Rayleigh criterion for the first dark fringe. It gives the angle at which the first dark fringe will appear in the diffraction pattern for a given wavelength of light and slit width.

When light waves pass through a single slit of width w, they diffract and create a diffraction pattern on a screen placed behind the slit. The pattern consists of a central bright fringe flanked by a series of alternating bright and dark fringes. The condition for the first dark fringe can be determined using the following formula:

sin θ = λ/w

where θ is the angle between the line normal to the slit and the direction of the dark fringe, λ is the wavelength of the light, and w is the width of the slit.

For the first dark fringe, the angle θ is equal to the smallest angle for which the path difference between the waves from the top and bottom edges of the slit is λ/2. This means that the condition for the first dark fringe is:

sin θ = λ/2w

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The force needed to stretch the steel wire by 1% is 25,140 N.

The given parameters include;

The area of the steel wire is calculated as follows;

\(A = \pi r^2\\\\ A= 3.142 \times (0.002)^2\\\\ A= 1.257 \times 10^{-5} \ m^2\)

The force needed to stretch the wire is calculated from Youngs modulus of elasticity given as;

\(E = \frac{stress}{strain} = \frac{F/A}{e/L} = \frac{FL}{Ae} \\\\F = \frac{EAe}{L}\)

\(F = \frac{200 \times 10^9\ \times\ 1.257\times 10^{-5}\ \times \ 0.01l_1}{l_1} \\\\F = 25,140\ N\)

Thus, the force needed to stretch the steel wire by 1% is 25,140 N.

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Consider a 240- mhmh radio coil connected to a 240- vv (rms) 10.0- khzkhz ac line. The reactance of the coil is 1.59 kΩ. The rms current in the coil is 150 mA.

To calculate the reactance of the coil, we can use the formula X = 2πfL, where X is the reactance, f is the frequency, and L is the inductance of the coil. Plugging in the given values, we get X = 2π(10.0 kHz)(240 mH) = 1.51 kΩ. Rounded to three significant figures, the reactance of the coil is 1.59 kΩ.

To calculate the rms current in the coil, we can use Ohm's law, which states that I = V/X, where I is the current, V is the voltage, and X is the reactance. Plugging in the given values, we get I = (240 V)/(1.59 kΩ) = 150 mA. Rounded to three significant figures, the rms current in the coil is 150 mA.

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Answer:

60N

Explanation:

6 times 60 =360 which is the amount so 60 n.

To find the speed of the spaceship using, speeds formula to calculate its.

What is speed?

The distance traveled in a unit of time is referred to as "speed." It is the rate of movement of an object. Speed is a scalar quantity, as is the velocity vector's magnitude. There is no clear direction to it. An object is moving more quickly if its speed is higher.

What is velocity?

A particle's or object's displacement with respect to time is expressed vectorially as velocity. The meter per second (m/s), also referred to as speed, is the accepted unit of velocity magnitude.

a) In the reference frame of the Earth, the first spaceship is moving at +0.61 c, and the second  spaceship is moving at +0.87c relative to the Earth is relative to the first. Thus the speed of the second spaceship relative to the Earth is

U =(v+u¹)/(1+vu¹/c^2)=(0.61c+0.87c)/(1+(0.61)(0.87))=0.967c

b) In the reference frame of the Earth, the first spaceship is moving at +0.61c and the second

spaceship is moving at -0.87 c relative to the first Thus the speed of the second spaceship relative to the Earth is

U =(v+u¹)/(1+vu¹/c^2)=(0.61c+(-0.87c))/(1+(0.61)(-0.87))= -0.554c

Therefore, the speed of the second ship with respect to the earth is 0.967c and  the speed of the second ship with respect to the earth if it is fired directly toward the earth is - 0.554c

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Explanation:

thomas edison and Nikola tesla were involved in the war of currents

Answer:

It has to be the "New Moon" because that is when the moon is between the sun and the earth.

A lunar eclipse can occur when the earth is between the sun and the moon.

Answer:

10.17 m/s in the direction the compact car was going (+)

Explanation:

Law of conservation of momentum states that total P before the collision must equal total momentum after the collision.

P = mv

solve for v, velocity of the two cars stuck together after the collision:

(187kg)(-38 m/s) + (702kg)(23 m/s) = (187 + 702 kg)v

         momentum before               =   momentum after

-7106 kg·m/s + 16146 kg·m/s = 889 kg(v)

9040 kg·m/s = 889 kg(v)

v = 9040 kg·m/s / 889 kg = 10.17 m/s

Electrostatic Field Equation

\(E = kq/r^2\) If q is doubled, E will be doubled as well, resulting in\(E = 2kq/r^2.\)

The electrostatic field equation states that the electric field strength (E) at a point in space is proportional to the electric charge (q) and inversely proportional to the square of the distance (r) between the point and the charge. The proportionality constant (k) is known as Coulomb's constant and has a value of approximately \(9 x 10^9 Nm^2/C^2.\)

When q is doubled, the numerator of the equation doubles, and as r^2 remains the same, the value of E will also double. This is because the strength of the electric field increases with the amount of charge present. The unit of electric field strength is Newtons per Coulomb (N/C), which represents the force exerted on a unit charge in the field.

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The value of the total length of spring when mass 2m is attached to it and extended is L + 2d.

A metal spring is moved from its equilibrium position when it is stretched or compressed. As a result, it encounters a restoring Force that usually causes the spring to retract back to its initial position. It is known as spring force.

Initial mass attached to the spring, m₁ = m

Natural length of the spring = L

Distance extended by the spring = d

Final mass attached to the spring, m₂ = 2m

The expression for the initial displacement or extension of the spring is given by,

d = mg/k

So, d ∝ m

So, initially with an extension of d, the total length of the spring became,

ΔL₁ = L + d

So, the final displacement of the spring can be calculated as,

d'/d = m₂/m₁

d' = m₂d/m₁

d' = 2m x d/m

So, d' = 2d

Therefore, the total length of the spring becomes,

ΔL₂ = L + d'

ΔL₂ = L + 2d

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Mars is the planetary body that has bedrock, reddish dust, and ice caps. This information comes from sources such as NASA, James Bon Cornell University, Michael Wolff (Space Science Institute), and the Hubble Heritage Team (STSCVAURA).

Mars, the fourth planet from the Sun in our solar system, is characterized by its reddish appearance due to the iron oxide (or rust) present in its soil and dust. The bedrock on Mars is made up of various types of rocks, such as basaltic rocks and sedimentary rocks, which have been shaped by geological processes over time. In addition to the bedrock and reddish dust, Mars is also known for its ice caps, which are primarily composed of water ice with some frozen carbon dioxide. These ice caps are located at the planet's north and south poles and provide valuable information about Mars' climate history and potential for future human exploration.

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Answer:

C.

Explanation:

Newton's 1st law states that an object at rest will stay at rest until acted upon by an external force.

Answer:

C is the answer for the question

Answer:

solids

Explanation:

Sound travels fastest through solids. This is because molecules in a solid medium are much closer together than those in a liquid or gas, allowing sound waves to travel more quickly through it. In fact, sound waves travel over 17 times faster through steel than through air

The impact speed will be

v^2 = 2*9.8*1.3

v^2 = 25.48

v= 5.04 m/s or O C. 5.0 m/s