physics teacher guide grade 9​

Answer:

9.0 m/s/s

Explanation:

Given the following data;

Initial velocity = 10 m/s

Final velocity = 55 m/s

Time = 5 seconds

To find the average acceleration;

In physics, acceleration can be defined as the rate of change of the velocity of an object with respect to time.

This simply means that, acceleration is given by the subtraction of initial velocity from the final velocity all over time.

Hence, if we subtract the initial velocity from the final velocity and divide that by the time, we can calculate an object’s acceleration.

Mathematically, acceleration is given by the equation;

\(Acceleration (a) = \frac{final \; velocity - initial \; velocity}{time}\)

Substituting into the equation;

\(a = \frac{55 - 10}{5}\)

\(a = \frac{45}{5}\)

Acceleration, a = 9.0 m/s²

Therefore, the average acceleration of the motorcycle is 9 meters per seconds square because it's experiencing a uniform velocity or motion.

The number of the square tiles that would be needed to tile the entire room is 2,800 tiles.

The area of the room is calculated by applying the following formula as shown below.

Mathematically, the formula for area of a rectangular room is given as;

A = L x B

where;

Area = 350 m x 200 m

Area = 70,000 m²

The area of the square tiles is calculated as follows;

A = L x L

where;

A = 5 m x 5 m

A = 25 m²

The number of the square tiles that would be needed to tile the entire room is calculated as follows;

n = area of the entire room / area of each square tile

n = ( 70,000 m² ) / ( 25 m² )

n = 2,800

Learn more about area of square here: https://brainly.com/question/813881

#SPJ1

Answer:

A. from a low-temperature areas to high-temperature areas

Explanation:

it goes from low-temperature to high-temperature because it's reacting

The overall net percentage of gain in the three stocks purchased each with $ 100 in which stock a increased 30% in value. stock b increased 15% in value. stock c lost 20% of its original value is 8.3 %

Value of Stock a = 100 + 30%

Value of Stock a = $ 130

Value of stock b = 100 + 15%

Value of stock b = $ 115

Value of stock c = 100 - 20%

Value of stock c = $ 80

Net percentage gain = ( Net profit / Total investment - 1 ) * 100

Net profit = 130 + 115 + 80

Net profit = $ 325

Total investment = 100 + 100 + 100

Total investment = $ 300

Net percentage gain = ( 325 / 300 - 1 ) * 100

Net percentage gain = ( 0.083 ) * 100

Net percentage gain = 8.3 %

Therefore, the the overall net percentage of gain in the three stocks is 8.3 %

To know more about Net percentage gain

https://brainly.com/question/27901953

#SPJ4

Answer:

The heat necessary to warm 500g of water from 20°C to 65°C is 37,620 J.

Explanation:

GIVEN: m = 500 gm, T₂ = 65°C AND T₁  = 20°C, we know that c (specific heat capacity) = 4180

TO FIND: The heat necessary to warm 500g of water from 20°C to 65°C.

SOLUTION:

By using the heat equation,

              Q=m c ΔT  

             ΔT = T₂ - T1

             ΔT = 65 - 20 = 45°C

In this case,

Q = 0.2 × 4180 × 45 = 37,620 J

Answer:

I believe its inference

Explanation:

Answer:

D. μs = Fs/Fn

Explanation:

The static friction coefficient, is always less than 1, for this reason, the friction force will always be less than the force of the body weight.

Answer:

D is correct. I just did it!!

Explanation:

An 8 AWG gray insulated neutral conductor is a type of wire that is commonly used in electrical systems. In this case, it is being used to supply a 120-volt electrical heater. The AWG (American Wire Gauge) refers to the thickness of the wire, and in this case, 8 AWG is a relatively thick wire that can handle a significant amount of electrical current.

The gray insulation on the wire is used to help identify it as the neutral conductor. The neutral conductor is an essential part of the electrical circuit, as it provides a path for the electrical current to return to the source. Without a neutral conductor, the circuit would not be complete, and the electrical device would not work.

Overall, the use of an 8 AWG gray insulated neutral conductor to supply a 120-volt electrical heater is a common and safe practice. It ensures that the electrical system is properly grounded and that the heater is receiving the appropriate voltage and current to operate safely and efficiently.

To Learn more about AWG (American Wire Gauge). Click this!

brainly.com/question/32309882

#SPJ11

Answer:

B is the best option but A is also good it's up to you but I'm leaning more towards B

Answer:

momentum after=momentum before

momentum before=Mbullet*Vbullet

Momentum after=(.49+.01)10=Mb*Vb

solve for V bullet

The voltage across the inductor and capacitor are equal and opposite, the voltage across the resistor, \(V_{r}\), must be equal to the voltage of the generator, \(V(t)\). Thus, \(V(t) = V_{r} = 170 V\).

An RLC series circuit can be defined as a circuit that includes one resistor, one inductor, and one capacitor that are all connected in series. Such a circuit has numerous practical applications and is typically utilized as a bandpass filter or in the creation of oscillators. The circuit is also known as a "resonant circuit," because it has the ability to resonate at a specific frequency, known as the resonant frequency. Consider the following RLC series circuit, which has an R-value of 100.0 Ω, an L-value of 0.70 H, and a C-value of 10.0 µF, connected to a generator with an emf \(V(t) = V_{max}\) cos(ωt), where \(V_{max} = 170 V\) and ω = 339 rad/s. The following is a brief description of the RLC series circuit:

At ω = 0, the capacitor in the circuit behaves as an open circuit, while the inductor behaves as a short circuit. As a result, the current flowing through the circuit is zero.

At high frequencies, the capacitor behaves as a short circuit, and the current flowing through the circuit is simply that which is determined by the resistance.

At the resonant frequency, the capacitor and inductor currents are equal and opposite, and the total current flowing through the circuit is zero. The resonant frequency, ω0, of the circuit can be calculated using the formula:ω0 = 1/√(LC)At the resonant frequency, the impedance, Z, of the circuit is equal to the resistance, R, of the circuit. The total current flowing through the circuit is the voltage divided by the impedance: I = Vmax/R.

The above RLC series circuit with an R-value of 100.0 Ω, an L-value of 0.70 H, and a C-value of 10.0 µF, connected to a generator with an emf \(V(t) = V_{max}\) cos(ωt), where \(V_{max} = 170 V\) and ω = 339 rad/s, can be analyzed in the following way:

At resonance, the impedance of the circuit is R = 100.0 Ω, and the total current flowing through the circuit is \(I = \frac{V_{max}}{R} = 1.70 A\). The phase angle of the circuit can be determined using the following formula:

tan θ \(= \frac{X_{l}- X_{c}}{R}\) Where Xl = ωL is the inductive reactance and \(X_{c}\) = 1/ωC is the capacitive reactance. At resonance, \(X_{l}= X_{c}\) = 1/ωC = ωL. As a result, the phase angle of the circuit is zero (cos θ = 1 and sin θ = 0), and the current and voltage are in phase with each other. The voltage across the inductor is \(V_{l} = X_{L}*I = I*\)ωL = 1.19 V, while the voltage across the capacitor is \(V_{c} = X_{c}*I = I\)/(ωC) = 53.77 V.

Since the voltage across the inductor and capacitor are equal and opposite, the voltage across the resistor, Vr, must be equal to the voltage of the generator, V(t). Thus, \(V(t) = V_{r} = 170 V\).

To know more about voltage visit:

https://brainly.com/question/32002804

#SPJ11

B 10,000 - 30,000 K Blue-white stars

A 7,500 - 10,000 K White stars

F 6,000 - 7,500 K Yellow-white stars

G 5,000 - 6,000 K Yellow stars (like the Sun)

The lowest temperature stars are red while the hottest stars are blue. Astronomers are able to measure the temperatures of the surfaces of stars by comparing their spectra to the spectrum of a black body.

As of September 2021, women made up approximately 47% of the U.S. labor force.

This percentage reflects the significant progress women have made in workforce participation over the years. The increased representation of women in the labor force is the result of various factors, including advancements in gender equality, improved access to education and career opportunities, and changing societal norms.

Women have made significant contributions to various industries and sectors, assuming roles across a wide range of professions. However, it's important to note that workforce demographics can change over time due to numerous factors, including economic conditions, cultural shifts, and policy changes.

Thus, it is recommended to refer to the most recent data from reliable sources, such as the U.S. Bureau of Labor Statistics, for the most accurate representation of women's participation in the U.S. labor force.

To know more about the U.S. labor force refer here :

https://brainly.com/question/32244280#

#SPJ11

Explanation:

list in order with the smallest molecules at the top and largest molecules at the bottom:

1.Oxygen

2.Water

3.Carbon dioxide

4.amino acid

5.Glucose

6. Starch

7. Protein

The molecules can be arranged as follows with the smallest at the top is oxygen, water, carbon dioxide, amino acid, glucose, starch, protein.

The given molecules;

starch, water, glucose, carbon dioxide, protein, amino acid, oxygen

The molecular weight of the given compounds is listed as follows;

water -------- 18 g/mol

glucose -------  180.2 g/mol

starch (2 or more glucose) ------ 360 g/mol

carbon dioxide ------ 44 g/mol

protein -------- 20,000 g/mol

amino acid (glycine) ----- 75 g/mol

oxygen -------- 16 g/mol

Thus, the molecules can be arranged as follows with the smallest at the top;

Learn more here:https://brainly.com/question/19537339

The maximum braking force that can be applied to the car having a mass of 500kg is 8820 N

F= μN ( μ= Coefficient of static friction and N= max normal reaction of the car)

= 1.8 X 500g= 1.8 X 500 X 9.8= 8820 N

Alternatively known as brake power, the braking force describes the total amount of force applied to a moving body that causes it to slow down or come to a stop. Breaking force is the minimum force, expressed in pounds, at which a chain, wire cable, webbing strap, or end device breaks when a continuously increasing force is applied to it. For this force to be calculated correctly, the vehicle's body must be moving at a known, constant speed. If the car's wheels are still turning while it is braking, static friction is at work; however, if the wheels are locked and sliding over the road, kinetic friction is at work. The breaking stress or ultimate tensile stress is the highest amount of stress a material can withstand before breaking.

Learn more about braking force here:

https://brainly.com/question/28966720

#SPJ4

Antonio will need a pipette to measure 15 ml of distilled water in a laboratory.

A pipette is a laboratory equipment used in measuring liquids in little amounts. 15 ml is a small amount of liquid so a pipette is a better fit for such amount.

We can conclude that a pipette is a better instrument to measure 15 ml of distilled water.

Read more on pipette here: https://brainly.com/question/16859368

#SPJ1

Answer:- Input for computer-based weather prediction models;

- Local severe storm, aviation, fire weather, and marine forecasts;

- Weather and climate change research;

- Input for air pollution models;

- Ground truth for satellite data

Explanation:

If the mass and post-collision speed of block 1 is known, the momentum of the block 2 can be determined.

The momentum of an object in motion is the product of mass and speed of the object.

P = mv

The principle of conservation of linear momentum states that, the sum of the initial momentum must be equal to the sum of the final momentum.

\(m_1v_1 = m_2 v_2\)

Thus, if the mass and post-collision speed of block 1 is known, the momentum of the block 2 can be determined.

Learn more about conservation of linear momentum here: https://brainly.com/question/7538238

A moving object's momentum is calculated by multiplying its mass by its speed. P = mv, momentum in a line is conserved. According to the conservation of linear momentum principle, the starting and final momentum must add up to the same amount.

Thus, A team that is genuinely moving forward and gaining momentum will be challenging to stop.

According to the conservation of linear momentum principle, the starting and final momentum must add up to the same amount.

The definition of momentum is "mass in motion." Since every item has mass, if it is moving, it must have momentum because its mass is in motion.

Thus, A moving object's momentum is calculated by multiplying its mass by its speed. P = mv, momentum in a line is conserved. According to the conservation of linear momentum principle, the starting and final momentum must add up to the same amount.

Learn more about Momentum, refer to the link:

https://brainly.com/question/30677308

#SPJ6

Answer:

Explanation:

option 1 - A and B move with the same speed INCORRECT because the lines have different slopes

option 2 - B moves with non-uniform speed  INCORRECT because the line for B is straight

option 3 - A completes his journey early INCORRECT because A ends his journey at about 11:45 after going about 42 km. B finishes his journey at about 11:35.

option 4 - B overtakes A at 11:10 a.m.  CORRECT.  They meet at the 30 km mark at 11:10, which is where the lines intersect.

In electronics, the ID of the term and VG are frequently used to denote the gate voltage and drain current of a MOSFET, or metal-oxide-semiconductor field-effect transistor. Transconductance, on the other hand, is a measure of the change in the drain current with respect to the change in the gate voltage and is abbreviated as GM.

To find ID vs. VG and gm for a JFET with power-law doping N = Np2 VG^n, where Np2 and n are constants, we need to use the JFET equation:

ID = IDSS [1 - (VG/VP)^2]

where IDSS is the drain current when VG = 0, and VP is the pinch-off voltage. To find gm, we use the small-signal model:

gm = ∂ID/∂VG = 2IDSS VG/VP^2

Substituting N = Np2 VG^n into the above equations, we get:

ID = IDSS [1 - (VG/VP)^2] = IDSS [1 - (Np2 VG^n/VP)^2]

and

gm = 2IDSS VG/VP^2 = 2IDSS (Np2 VG^n)/VP^3

We can see that both ID and gm are functions of VG^n. Therefore, we need to plot ID and gm as functions of VG^n instead of VG. We can do this by taking the nth root of VG and then plotting ID and gm vs. this value.

Note that when n = 1, N = Np2 VG^n becomes a linear function and we get the standard JFET equations:

ID = IDSS [1 - VG/VP]^2

and

gm = 2IDSS VG/VP^2

However, for n ≠ 1, the ID vs. VG and gm vs. VG plots will be different from the standard JFET plots and will depend on the values of Np2, n, IDSS, and VP. To get a detailed answer for a specific JFET, we need to know the values of these parameters.

To know more about Metal-Oxide-Semiconductor visit:

https://brainly.com/question/29833395

#SPJ11

Answer:

Explanation:

Newton's first law states that, if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force. This postulate is known as the law of inertia.

hope this helps :))

There is no force acting on the baseball the statement best explains why the baseball remains motionless.

A body wants to remain in its original position until or unless the external force is not applied to it. Such a phenomenon is known as inertia.

Newton's first law asserts that if a body is at rest or traveling at a uniform speed in a straight direction,

It will remain at rest or continue to move in a straight path at a constant speed until acted on by a force. This is referred to as the law of inertia.

There is no force acting on the baseball the statement best explains why the baseball remains motionless.

Hence option B is correct.

To learn more about the inertia refer to the link;

https://brainly.com/question/3268780

The molar mass of the gas is 154.9 g/mol.

The molar mass of the gas can be calculated using the ideal gas law, which relates the pressure, volume, temperature, and number of moles of a gas. Rearranging the ideal gas law equation to solve for the molar mass gives:

Molar mass = (density x gas constant x temperature) / pressure

Substituting the given values, we get:

Molar mass = (6.20 g/L x 0.08206 L atm/mol K x 400.0 K) / 1.30 atm = 154.9 g/mol

Therefore, the molar mass of the gas is 154.9 g/mol.

In summary, the molar mass of a gas can be determined from its density, temperature, and pressure using the ideal gas law equation. The equation is rearranged to solve for the molar mass by substituting the given values for density, gas constant, temperature, and pressure.

For more questions like Mass visit the link below:

https://brainly.com/question/13981472

#SPJ11

The child's speed at the bottom of the slide can be determined using the principle of conservation of mechanical energy. The speed at the bottom of the slide is approximately 6.26 m/s.

The principle of conservation of mechanical energy states that the total mechanical energy (sum of kinetic energy and potential energy) remains constant in the absence of external forces. Since the slide is frictionless, there is no loss of mechanical energy.

At the top of the slide, the child possesses potential energy, given by

PE = mgh, where m is the mass of the child, g is the acceleration due to gravity, and h is the initial height. As the child slides down, the potential energy is converted into kinetic energy, given by KE = (1/2)mv^2, where v is the speed at the bottom.

By equating the initial potential energy to the final kinetic energy, we can solve for v. Substituting the values, the speed at the bottom of the slide is approximately 6.26 m/s.

learn more about conservation click here;

brainly.com/question/9530080

#SPJ11

Answer:

The quadratic function models the path of the rocket. When we substitute an x value, we can determine the height in feet of the rocket.

To determine the height it was launched from, we would look at the y-intercept. This represents the starting value, as time = 0 in this point (cannot have negative time).

To determine how far the rocket traveled, we would look at the positive x-intercept of the expression. At this point, height = 0, so we can see the distance from start to finish of the rocket.

To determine the greatest height achieve, we would look at the vertex of the parabola generated from the given function. Using (-b/a, f(-b/a)), we can determine the greatest height achieved.

Answer:

Explanation:

4375J

The lightning strike is approximately 2 kilometers away if you hear the thunderclap 6.0 seconds after seeing the lightning bolt.

When lightning strikes, it produces both light and sound waves. Light waves travel at a much faster speed than sound waves, so we see the lightning before we hear the thunderclap. The speed of sound in air is approximately 340 m/s. To calculate the distance of the lightning strike, we can use the formula:
distance = speed x time
If we know that it took 6.0 seconds for the thunderclap to reach us, we can multiply this time by the speed of sound to find the distance.
distance = 340 m/s x 6.0 s = 2040 m
However, this distance only accounts for the time it took for the sound to reach us. The lightning bolt itself also has to travel from its location to our eyes, but we can assume that it travels at the speed of light, which is much faster than the speed of sound. Therefore, we can ignore the time it takes for the lightning to reach us and conclude that the lightning strike is approximately 2 kilometers away.

Learn more about sound here:

https://brainly.com/question/29707602

#SPJ11

Answer:

S = V0 t + 1/2 a t^2   standard equation

Where S is the distance traveled and V0 the initial speed

longitudinal wave, wave consisting of a periodic disturbance or vibration that takes place in the same direction as the advance of the wave. ... Sound moving through air also compresses and rarefies the gas in the direction of travel of the sound wave as they vibrate back and forth.

FORMULA

y = displacement of the point on the traveling sound wave

x = distance the point has traveled from the wave's source

y_0 = amplitude of the oscillations

\omega = angular frequency of the wave

t = time elapsed

c = speed of the wave

Answer:

I think it represents the center of a right angle..?

The amount of work that is done using a 500-watt microwave oven for 5 minutes is 150,000 J.

Work is a measure of energy expended in moving an object. It is generally said that "no work is done if the object does not move".

Power is a measure of the amount of work that can be done in a given amount of time. It can be represented by the following equation:

Power (J/s) = Work done (J) / time (s)

This means that work done = power × time

According to this question, a 500-watt microwave oven is used for 5 minutes. The amount of work done can be calculated as follows:

Work done = 500W × 300s

Work done = 150,000 J

Learn more about work done at: https://brainly.com/question/13787582

#SPJ1

Answer:

The time it takes for the jet to reach landing speed is approximately 0.136 hours which is approximately 489 seconds

The landing speed is approximately 466.365 km/hr

Explanation:

The given parameters are;

The initial cruising speed of the jet = Mach 0.79 = 844 km/hr

The rate of speed reduction in the last 89 km = -2780 km/hr²

The distance it  takes the jet to reduce its speed for landing = 89 km

Given the above information,  we make use of the following equation of motion;

s = u·t - 1/2·a·t²

v² = u² - 2·a·s

Where;

s = The distance over which the acceleration (deceleration) is applied = 89 km

u = The initial velocity = 844 km/hr

t = The time taken for the accelerating/decelerating motion

v = The final velocity (landing speed)

Substituting the values gives;

v² = 844² - 2·(2780)·89 = 217496

v = √217496 = 466.365 km/hr

v ≈ 466.365 km/hr

Therefore, the landing speed, v  ≈ 466.365 km/hr

The time it takes is given by the equation, v = u - a·t

Therefore;

t = (u - v)/a = (844 - 466.365)/2780 ≈ 0.136 hours

The time it takes for the jet to reach landing speed ≈ 0.136 hours

From, s = u·t - 1/2·a·t², we have

89 = 844·t - 1/2 × 2780 × t²

89 = 844·t - 1390 × t²

1390 × t² - 844·t + 89 = 0

Solving with an online application gives;

t = 211/695 + (√(27187/2))/695 = 0.4715 hours or t = 211/695 - (√(27187/2))/695 = 0.136 hours

We note that the second time is for the time it will take the jet to get back to 89 km after reaching a speed of 0

Therefore, the correct time is t = 0.136 hours

The time it takes for the jet to reach landing speed ≈ 0.136 hours