A spinning top initially spins at 16rad/s but slows down to 12rad/s in 18s, due to friction. If the rotational inertia of the top is 0.0004kg.m2, by how much the angular momentum of the top changes?

The rise in temperature of the body as determined from the specific heat capacity, mass, and heat change of the body is 12.24 °C.

The rise in temperature of the body is determined from the specific heat capacity, mass, and heat change of the body.

The formula relating the temperature rise of the body, the specific heat capacity, mass, and heat change of the body is given below:

Heat change = mass * specific heat capacity * temperature rise

Temperature rise = Heat change / mass * specific heat capacity

Temperature rise = 3.6 * 10⁶ J / 84 kg * 3,500 J/kg/°C

Temepartaure rise = 12.24 °C

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The strength of the electric field is 2157 N/C, the angle at the net electric field is 9.33° above the horizontal.

Strength of the electric field:

= E = k Q / d²

Given;

k = 8.99 · 10⁹

d 1 = 5 cm = 0.05 m

Q 1 = 3 n C = 3 · 10⁻⁹ C

E 1 = 8.99 · 10^9 · 3 · 10⁻⁹ C / ( 0.05 m )² = 10,788 N / C

E 1 = 10,788 i + 0 j

(d 2)² = √ (5² + 10²) =√ 125 = 11.18 cm = 0.1118 m

E 2 = 8.99 · 10⁹ · 3 · 10⁻⁹C / ( 0.1118 m )² = 2,157 N/C

Angle:

cot⁻¹ ( 5/10 ) = cot⁻¹ 0.5 = 63.43°

= E 2 = cos 63.43° · 2,154 i + sin 63.43° · 2,154 j

= E 2 = 963.46 i + 1,927.02 j

E = E 1 + E 2 = 11,731.46 i + 1,927.02 j

= √ (11,731.46² + 1,927.02² )

= 11,888 N/C

α = tan⁻¹ ( 1,927.02/11,731.46) = tan⁻¹ 0.1643 = 9.33° above the horizontal.

-- The given question is incomplete, I answer the question in general according to my knowledge and the complete question is

"What are the strength and direction of the electric field at the position indicated by the dot in (figure 1)? Where, the two positive charges of 3 nC are at a distance of 10 cm and the distance between the first proton and the position indicated is 5 cm." --

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Answer:

+1.46×10¯⁶ C

Explanation:

From the question given above, the following data were obtained:

Charge 1 (q₁) = +26.3 μC = +26.3×10¯⁶ C

Force (F) = 0.615 N

Distance apart (r) = 0.750 m

Electrical constant (K) = 9×10⁹ Nm²/C²

Charge 2 (q₂) =?

The value of the second charge can be obtained as follow:

F = Kq₁q₂ / r²

0.615 = 9×10⁹ × 26.3×10¯⁶ × q₂ / 0.750²

0.615 = 236700 × q₂ / 0.5625

Cross multiply

236700 × q₂ = 0.615 × 0.5625

Divide both side by 236700

q₂ = (0.615 × 0.5625) / 236700

q₂ = +1.46×10¯⁶ C

NOTE: The force between them is repulsive as stated from the question. This means that both charge has the same sign. Since the first charge has a positive sign, the second charge also has a positive sign. Thus, the value of the second charge is +1.46×10¯⁶ C

Answer:

+1.46

Explanation:

acellus

Answer: T=153minutes

Explanation:

For time period of revolution , the expression is as follows .

T² =  4π² R³ /GM , M is mass of the earth.

Putting the values

T² =  4π² (9480 x 10³)³ /(6.67 x 10⁻¹¹ )( 5.97 x 10²⁴ )

T² = 8.436 x 10⁷ s

T = 9.184x 10³ s

= 9184 s

= 153minutes .

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The acceleration of Thomas is 0.233 m/s^2.

Acceleration is the rate of change of velocity. Thomas the Train chugs along at a velocity of 2 m/s.

Thomas needs to go faster so more coal is shoveled into his engine and he accelerates for 10 seconds until he is going 4.33 m/s.

We are to find the acceleration of Thomas.

The formula for acceleration is given as :

acceleration = (final velocity - initial velocity) / time

In the given problem, the initial velocity of Thomas, u = 2 m/s.

The final velocity of Thomas, v = 4.33 m/s The time for which Thomas accelerates, t = 10 s.

Therefore, the acceleration of Thomas will be given as:

a = (v - u) / ta = (4.33 - 2) / 10s => 2.33 / 10s => 0.233 m/s^2

Thus, the acceleration of Thomas is 0.233 m/s^2.

To summarize, the acceleration of Thomas is 0.233 m/s^2.

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The fan blades or propellers of an electric fan are examples of an inclined plane. The blades' frequently curved or angled shapes provide an inclined surface that effectively moves air.

Air is forced along the incline as the blades spin, creating airflow. An electric fan's motor assembly includes a wheel and an axle. The rotor, a revolving component, is connected to the motor's central shaft, also known as the axle.

Usually cylindrical in form, the rotor serves as the wheel. The motor spins around the fixed axle when electrical power is applied, which causes the fan blades to move and the air to circulate.

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Answer:

B. Myron increased the friction by increasing speed.

Explanation:

i got it correct on edge

Answer:

The answer is B i think

Explanation:

a, b,d, g are expressions could be valid ways to calculate a distance in physics.

A physical quantity is a feature or quality of an object that may be gauged or computed from other measures. The quantification of physical quantities is expressed and evaluated using standards called units. Four fundamental units can be put together to create any unit.

The physical quantity of expression:

2πd => where d is position

d has unit 'm'

=> hence, 2πd => unit 'm'

Therefore, we can us this expression to define distance.

Sqrt (x+y ^2) => x, y are distance=> unit 'm'

=> sqrt(m+m^2) => In total, this expression does not have unit 'm'. hence, we can't use this expression to define distance.

The length, mass, time, electric current, temperature, amount of a substance, and luminous intensity are the seven fundamental physical units that constitute up the International System of Units (SI), which is used to express all physical quantities.

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Which of the following expressions could be valid ways to calculate a distance in physics? Briefly explain why/why not for each. (Hint: Think about what kind of physical quantity each term is, and what units it carries.)

(a) 2πd , where d is a position

(b) x+Δr, where x is a distance and Δr is a position difference

(c) Sqrt (x+y ^2), where x and y are both distances

(d) Sqrt( x^2+y^2), where x and y are both distances

(e) Sqrt(A+z), where A is an area and z is a distance

(f) vΔt^2, where v is a velocity and Δts a time difference

(g) aΔt^2, where a is an acceleration and Δt is a time difference

Answer:

∙ Temperature

∙ Concentration of electrolyte

∙ Nature of the electrolyte added

∙ Nature of solvent and its viscosity

Explanation:

Based on the astronomers definition of stars, All stars are part of some constellation. Only the statement II is correct.

All stars visible from Earth are part of a constellation, which is a region of the sky defined by the International Astronomical Union (IAU). The IAU has divided the sky into 88 official constellations, each with its own boundaries and set of stars. Astronomers use the constellations as a way to locate and identify stars and other celestial objects in the night sky.

The brightness of a star is not necessarily related to its position or designation within a constellation, so the first statement is not correct. Also, the presence or absence of an Arabic name is not an indication of a star's brightness, so the third statement is not correct.

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--The complete question is, Every star is part of a constellation and is assigned a Greek letter within the constellation. Many stars still bear ancient Arabic names. Based on how astronomers refer to stars, select all of the correct statements from the following list.

I The star in a constellation is usually brighter than the B star.

II All stars are part of some constellation.

III A star with an ancient Arabic name is probably relatively bright.--

The work done by the force on the block is approximately 311.2 Joules.

To calculate the work done by the constant force of magnitude F = 45 N over a distance of 8 m at an angle of 30 degrees to the horizontal, we need to find the component of the force that acts parallel to the displacement.

The horizontal component of the force can be calculated using trigonometry:

F_horizontal = F * cos(angle)

            = 45 N * cos(30 degrees)

            = 45 N * (√3 / 2)

            ≈ 38.9 N

Now, we can calculate the work done by the force using the equation:

Work = Force * Distance * cos(theta)

where theta is the angle between the force and the displacement.

Work = F_horizontal * Distance * cos(0)

     = 38.9 N * 8 m * cos(0)

     = 38.9 N * 8 m

     = 311.2 Joules

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Answer: 207 W

Explanation: I assumed here that the object is moved vertically. If that is the case, the work done on the object is equal to its change in gravitational potential energy:

where

m = 47 kg is the mass of the object

g = 9.8 m/s^2 is the acceleration of gravity

is the change in height

Substituting,

Now we can calculate the power used, which is given by

Hope this helps I'm sorry if i'm wrong but I tried :(

Answer:

distance

Explanation:

Speed is the rate of change of position expressed as distance travelled per unit of time

The energy input at aphelion (farthest from the sun) is 92% of the intensity at perihelion (closest to the sun) because of the inverse-square law, which states that the intensity of radiation decreases with the square of the distance from the source.

However, the difference in energy input does not solely explain the difference in surface temperature from winter to summer.

Other factors, such as the Earth's axial tilt, atmospheric composition, and cloud cover also play a role in determining the surface temperature.

Evidence from climate models and observations indicate that changes in these factors, especially changes in the number of greenhouse gases in the atmosphere, can have a significant impact on global temperature patterns.

In conclusion, while the inverse-square law affects the intensity of solar radiation, it is not the sole factor in determining surface temperature, and the role of other factors must be considered to fully understand seasonal and climatic variations.

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Answer:

v = 2.64 m\s

Explanation:

use the P.E =mgh

and high point K.E = 0

P.E +K.E = P.E + 0

AT LOW POINT

K.E = 0.5 MV^2

P.E = 0

0.5 MV^2 = mgh

Recall the symbols for a cell, a switch, and a lamp:

To create a diagram of a cell, a switch and two lamps connected in series, draw the symbols one after another in a circuit:

Answer:

please in english......................................

Explanation:

Answer:

C

Explanation:

The most commonly accepted theory of muscle growth states that microscopic tears within a muscle activate an inflammatory response process that causes dormant cells to build and regenerate muscle tissue; this is option c.

It has negative consequences on the muscle, and it is also known as "microtrauma," which occurs as a result of muscle contraction and is a normal part of the muscle repair and growth process. Here, the fibers in the muscle are damaged, and in response, the body initiates a repair process. This leads to muscle growth and increased strength and is helpful for muscle repair.

Hence, the most commonly accepted theory of muscle growth states that microscopic tears within a muscle activate an inflammatory response process that causes dormant cells to build and regenerate muscle tissue; this is option c.

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Answer:

Measurements/cor. units      Resistor 1    Resistor 2    Resistor 3      Total

V (volts)                                       24V              16V            12.63V        120 V

I (A – amperes)                          4.8A             2.13A          1.34A          5.45A

R (Ω – ohms)                            5.0 Ω            7.5 Ω           9.5 Ω            22Ω

P (W – work)                            115.2W          34.08W      16.92W        2,640W

Carl Rogers, along with Abraham Maslowsignificantly contributed to the humanistic psychology movement through his development of the person-centered approach and his emphasis on the individual's subjective experience and potential for personal growth.

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Explanation:

Given that,

The frequency of oscillation, f = 0.5 Hz

(a) Let the length of the pendulum string is l. So,

\(T=2\pi \sqrt{\dfrac{l}{g}}\)

T is time period, T = 1/f

So,

\(l=\dfrac{(\dfrac{1}{f})^2g}{4\pi ^2}\\\\l=\dfrac{(\dfrac{1}{0.5})^2\times 9.8}{4\times 3.14 ^2}\\\\l=0.993\ m\)

(b) When the elevator starts to accelerate upwards, new acceleration is a+g.  If accelerating upward, the value of g has increased, because of inertia. So it will feel heavier and the period will decrease.

Answer:

Explanation:

Let's just have our reference frame travel along with the original un broken mass. This way the original velocity is not relevant.

Each half will have a mass of 770/2 = 385 kg

Each half will have the same magnitude of velocity (conservation of momentum) which will be 2.6 x 10³/2 = 1.30 x 10³ m/s

Now add back the reference frame velocity to get velocity relative to earth.

Section one will have velocity 6.90 x 10³ + 1.30 x 10³ = 8.2 x 10³ m/s

Section two will have velocity 6.90 x 10³ - 1.30 x 10³ = 5.6 x 10³ m/s

In the moving reference frame, each half will have kinetic energy which could only come from the explosion

KE = ½(385)(1.3 x 10³)² = 325,325,000 J

2(325,325,000) = 650,650,000 J released in the explosion.

Rounding to the three significant figures of the problem numerals

E = 6.50 x 10⁸ J or 650 MJ released

Based on the information provided, it is likely that the figure shows an alternating current (AC). The arrows under the electrons pointing right and left, both towards and away from the light bulb, indicate that the direction of the electron flow is changing periodically. This is a characteristic of alternating current, where the flow of electric charge reverses direction periodically, typically in a sinusoidal manner.

In an AC circuit, the voltage also changes direction periodically, which is consistent with the changing direction of the electron flow shown in the figure.

In an alternating current, the flow of electrons periodically reverses direction, causing the current to switch between positive and negative values. This is different from direct current (DC), where electrons flow in a single, constant direction.

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The tension in the cable is F = πEaV²r³/2d²

The work. done. by the cable. is W = πEaV²r²/4d

\(\mathbf{U_i-U_f=\frac{\varepsilon_0\pi r^2 V^2}{2d}-\frac{\varepsilon_0\pi r^2 V^2}{4d}}\mathbf{\Rightarrow U_i-U_f=\frac{\varepsilon_0\pi r^2 V^2}{4d}}\)

The equation can be used to depict the electric field created between two circular plates of a capacitor if they are separated by a constant distance and supported by a cable.

E = V/d

E' = E/2

F = qv/2d

F = Eav2r2/2d2.

Assuming that dz has shifted the upper plate higher, we can express the tension's work as follows:

dw = T*dz

dz = F * dw

The cable's work is W = Eav2r2/4d, or W = Eav2r2/2z2*dz.

Before the top plate is raised, the electrical energy capacitor has the following amount of energy stored in it:

Ui = 1/2 Cv²

Ui = EaR2V2D

Yes, the work carried out by the cable is equivalent to the change in electrical energy that has been stored. The variation in energy previously stored

Ui = Eaπr²v²/4d

\(\mathbf{U_i-U_f=\frac{\varepsilon_0\pi r^2 V^2}{2d}-\frac{\varepsilon_0\pi r^2 V^2}{4d}}\mathbf{\Rightarrow U_i-U_f=\frac{\varepsilon_0\pi r^2 V^2}{4d}}\)

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Answer:

blue

You see white. What happens when you shine cyan light on a magenta shirt? You see blue.

Explanation:

What is common among all the graphs is that they all show an object that is moving.

In the distance time graph, we have the distance on the vertical axis and we have the time on the horizontal axis and the shape of the plots may differ depending on the nature of the motion of the objects.

Graphs of distance vs time help us to examine motion by showing how an object has moved over time. All objects shown on a distance vs. time graph are shifting positions over time, regardless of the graph's specific shape or slope, and the graph reveals information about the direction and speed of their motion.

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Answer:

D

Explanation:

The FitnessGram PACER Test is a multistage aerobic capacity test that progressively gets more difficult as it continues.

The test is used to measure a student's aerobic capacity as part of the FitnessGram assessment. Students run back and forth as many times as they can, each lap signaled by a beep sound. The test get progressively faster as it continues until the student reaches their max lap score.

The PACER Test score is combined in the FitnessGram software with scores for muscular strength, endurance, flexibility and body composition to determine whether a student is in the Healthy Fitness Zone™ or the Needs Improvement Zone™.

Answer: D is the correct answer

Explanation:

D has a variety of molecules

Scobie will take 10 days to drive around Earth's equator.

To calculate the time that takes Scobie to drive around Earth's equator we need to find the distance, which is given by the equation of a circumference:

\( d = 2\pi r \)

Where:

r: is the Earth's radius = 6371 km

Then, the distance is:

\( d = 2\pi r = 2\pi*6371 km = 40030.2 km \)

Now, if we divide the above distance by the speed of the car we can find the time:

\( t = \frac{d}{v} = \frac{40030.2 km}{160.0 km/h} = 250.2 h*\frac{1 d}{24 h} = 10 d \)

Therefore, Scobie will take 10 days to drive around Earth's equator.

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