a tree house is 8 m above the ground. if peter does 360 j of work while pulling a box from the ground up to his tree house with a rope, what is the mass of a box?

The special theory of relativity predicts that fast-moving objects will appear to be shorter along the direction of motion than when they are seen at rest. Option B is the correct answer.

According to Einstein's theory, an item contracts more in the direction of motion the quicker it moves. This effect is not perceptible in our ordinary experiences since it is only perceptible at speeds that are a considerable fraction of the speed of light. Option B is the correct answer.

A fundamental theory of physics known as the special theory of relativity describes how the rules of physics apply to things moving quickly. The most well-known prediction of the theory is that no matter how quickly the observer is travelling in relation to the light source, the speed of light stays constant in all reference frames. Numerous tests have verified this prediction, which is now regarded as one of the foundations of contemporary science.

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The complete question is, "The special theory of relativity predicts that fast-moving objects will appear to be ______than when they are seen at rest:

a. fatter

b. shorter along the direction of motion

c. stretched out along the direction of motion

d. older

e. less massive"

The car travels in straights line i.e. the speed of car is 50.4m/s

The instantaneous speed is the upper limit of the average speed as the duration of the time interval approaches zero. The average speed of an item in a period of time is equal to the distance travelled by the object divided by the duration of the period.

We are given that,

Acceleration = a = 4.2 m/s²

Time = t = 12sec

The speed of car can be calculated as,

a = dv/dt

dv = a× dt

dv = 4.2 m/s² × 12sec

dv = 50.4m/s

Therefore the car travels in straights line i.e. the speed of car will be 50.4m/s.

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Answer:

12 cm

Explanation:

A jet airplane is flying at 0.72 mach with an OAT of -40 degrees C. The true airspeed is 464 knots.

Airspeed refers to the speed at which an aircraft moves relative to the surrounding air. It is usually measured in knots or miles per hour and is a critical factor in aviation as it affects the aircraft's performance, stability, and fuel efficiency.

There are different types of airspeed measurements, including indicated airspeed (IAS), calibrated airspeed (CAS), true airspeed (TAS), and groundspeed (GS). IAS is the speed measured by the aircraft's pitot tube, which is affected by the altitude, temperature, and atmospheric pressure. CAS is IAS corrected for instrument and installation errors. TAS is the actual speed of the aircraft relative to the air mass in which it is flying, and it is calculated using CAS adjusted for altitude and temperature. Finally, GS is the speed of the aircraft relative to the ground.

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Answer: To calculate the mass of the helium sample, we can use the ideal gas law equation, which relates the pressure, volume, temperature, and amount of gas for an ideal gas:

PV = nRT

Where:

P = pressure of the gas

V = volume of the gas

n = amount of gas in moles

R = universal gas constant

T = temperature in Kelvin

Given information:

Pressure (P) = constant pressure during the process

Initial temperature (T1) = 283 K

Final temperature (T2) = 393 K

Work done by the gas (W) = 40 J

Universal gas constant (R) = 8.31451 J/mol · K

Since the pressure is constant, we can rearrange the ideal gas law equation to solve for the amount of gas (n) in moles:

n = (PV) / (RT)

Substituting the given values into the equation:

n = (constant pressure during the process * volume) / (universal gas constant * temperature)

Now we can calculate the amount of gas in moles.

Next, we can convert the amount of gas from moles to grams using the molar mass of helium (He), which is approximately 4 g/mol.

Finally, we can multiply the mass in grams by 1000 to convert it to grams.

Let's plug in the numbers and do the calculations:

P = constant pressure during the process

V = volume of the gas (not given in the question, need additional information)

R = universal gas constant = 8.31451 J/mol · K

T1 = initial temperature = 283 K

T2 = final temperature = 393 K

W = work done by the gas = 40 J

Molar mass of helium (He) = 4 g/mol

Please provide the value for the volume (V) of the helium gas in order to complete the calculation.

Answer:

Assume I1 = Io * T1        transmission proportional to thickness

I2 = Io * T2          I is intensity of light absorbed     (3/8 absorbed)

I1 / I2 = T1 / T2

T2 = T1 * (I2 / I1) = 2 * (2/3 / 3/8) = 2 * 16/9 = 32/9   thickness for 2/3 absorbed

The length of the beaker when the transmittance is changed to one-third is 13.78 cm.

The given parameters;

To find:

The length of the beaker is calculated by applying Beer-Lambert law;

\(\frac{I}{I_o} = e^{-cl}\)

\(\frac{I_1}{I_0} = e^{-cl_1} = \frac{3}{8} \ ----(1)\\\\\frac{I_2}{I_0} = e^{-cl_2}= \frac{1}{3} \ ---- (2)\)

divide equation (1) by equation (2);

\(\frac{e^{-cl_1}}{e^{-cl_2}} = \frac{3}{8} \times \frac{3}{1} \\\\ (c \ is \ constant \ for \ both) \\\\e^{-l_1 + l_2} = \frac{9}{8} \\\\l_2 - l_1 = ln(\frac{9}{8} )\\\\l_2 - 0.02 = 0.1178\\\\l_2 = 0.1178 + 0.02\\\\l_2 = 0.1378 \ m\\\\l_2 = 13.78 \ cm\)

Thus, the length of the beaker when the transmittance is changed to one-third is 13.78 cm.

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The answer for (iv) is;

E.M.F of the battery refers to the chemical energy in the battery that is being converted into electrical energy for the flow of electrons to carry current in a circuit.

Answer:

A dimension is a measure of a physical variable.

Unit is a way to assign a number or measurement to that dimension.

In dimensional analysis, a dimensionless quantity is a quantity to which no physical dimension is assigned, also known as a bare, pure, or scalar quantity or a quantity of dimension one, with a corresponding unit of measurement is the SI of the unit one, which is not explicity shown.

Answer:

true

Explanation:

this is true, igneous rocks are formed from molten lava when it cools

Answer: True

Explanation:

Answer:

7.39 m/s

Explanation:

Applying

K.E = 1/2mv²..................... Equation 1

Where K.E = Kinetic Energy, m = mass of the ball, v = velocity of the ball.

Make v the subject of the equation

v = √(2K.E/m)................. Euqation 2

From the question,

Given: K.E = 30 J, m = 1.1kg

Substitute these values into equation 2

v = √(2×30/1.1)

v = √54.54

v = 7.39 m/s

The magnitude of the linear acceleration of the pack can be calculated using the following equation:a = (T - Fr) /m where a is the magnitude of the linear acceleration of the pack,T is the tension force of you on the pulley,Fr is the frictional force, and m is the mass of the pack.Substitute the given values to the formula:a = (T - Fr) / ma = (266.3 - Fr) / 23.4.

The frictional force can be determined using the moment of inertia of the pulley.I = mr²I = 2.85 kg-m²m = I / r²m = 2.85 / 0.43²m = 15.57 kgFr = maFr = 15.57 × aa = (266.3 - 15.57a) / 23.4Solve for a by multiplying both sides by 23.4:23.4a = 266.3 - 15.57a23.4a + 15.57a = 266.3a = 266.3 / 39.97a = 6.66 m/s².

Therefore, the magnitude of the linear acceleration of the pack is 6.66 m/s².If instead of using a pulley with two radii, you were to replace the two radii pulley with a simple pulley of one radius, it will be harder to hold the pack.

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TRUE. Interstellar clouds provide the material from which stars are made, but they also give back a significant amount of that material to interstellar space.

The point where the Sun's continuous outpouring of matter and magnetic field ceases to have an impact on its surrounds is where scientists designate the beginning of interstellar space. The heliopause refers to this location. It delineates the conclusion of the heliosphere, an area produced by our Sun.

According to Voyager 1's detection, a magnetic zone that stretches outward from the Sun for roughly 122 AU is known as interstellar space. This region of influence also extends outward to other stars, therefore interstellar space is the area beyond these regions.

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Answer:

Physical Changes :- The substance in which no new substance is formed are called physical changes.

The molecular composition of the substance are totally same.

For example :- Crushing a mineral into powder.

Answer:

Explanation:

Perhaps how do forces such as friction benefit us in our lives? If it wasn't for friction, more car accidents were likely to happen.

Or if it wasn't for the gravitational force, we wouldn't be comfortable as we are now. Earth keeps on orbiting around the sun due to gravitational force! This is something that is very essential to us!

The answer is True. Magnetism-detecting bacteria have the ability to align with magnetic fields, which is known as magnetotaxis. This is accomplished through the presence of magnetosomes, which are specialized organelles that contain magnetic particles.

These magnetic particles allow the bacteria to sense the Earth's magnetic field and use it for orientation and navigation. When an external magnetic field is applied, the magnetosomes within the bacteria will align with the field, causing the bacteria to turn and move in the direction of the field. This property has been studied and utilized in various fields such as biotechnology and medicine for targeted delivery of drugs and therapies. In summary, magnetism-detecting bacteria can turn with an applied magnetic field due to their ability to align with magnetic fields.

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Answer:

ALL OF THE ABOVE

Explanation:

A vehicle undergoes acceleration when what three things happen?

If there is acceleration, the velocity will change, either increasing or decreasing. The correct answer is D.

The rate of growth of velocity is defined as acceleration. Acceleration usually indicates that the speed is changing, but this is not always the case. When an object is in motion in a circular track at a steady speed, it is still going to accelerate because its velocity direction changes.

Newton's Second Law states that an object's acceleration is the net result of all force applied to it. Acceleration is measured in meters per second squared.

The formula is given as,

a = Δv / Δt

If acceleration exists, the change of the velocity will be there and it may be increasing or decreasing. Then the correct option is D.

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The particle's location vector at time t is given by: r(t) = t³ + t² + 1

As per the question, we have the velocity of the particle in polar coordinates, but we need to find the position of the particle at time t. To do this, we need to integrate the velocity vector to obtain the position vector.

Let's consider the given velocity vector:

v(t) = (3t² + 2t)i + (2t² + 3t)j

To integrate this velocity vector, we need to find the corresponding position vector. Since the velocity vector is given in polar coordinates, we can express it in terms of polar variables:

v(t) = r'(t) + r(t)θ'(t)

where r'(t) and θ'(t) are the radial and angular components of the velocity vector, respectively.

By comparing the given velocity vector with the above equation, we can write:

r'(t) = 3t² + 2t

θ'(t) = (2t²+ 3t)/r(t)

Integrating r'(t) with respect to t, we get:

r(t) = t³ + t² + C

where C is the constant of integration.

To determine the value of C, we need to use the initial condition given in the problem. The particle starts at the position r = 1 and θ = π/4 at time t = 0. This implies:

r(0) = 1

θ(0) = π/4

Substituting these values in the equation for r(t), we get:

1 = 0 + 0 + C

C = 1

Therefore, the position vector of the particle at time t is given by:

r(t) = t³ + t² + 1

To find the value of θ at time t, we integrate θ'(t) with respect to t:

θ(t) = ∫(2t² + 3t)/r(t) dt

= ∫(2t² + 3t)/(t³ + t² + 1) dt

This integral is not trivial to solve analytically. Therefore, the position of the particle at time t can be expressed as:

r(t) = (t³ + t² + 1)i + f(t)j

where f(t) is the solution of the above integral for θ(t).

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Answer:

Answer:

[a] Friction is a force.

[c] An unbalanced force is necessary to cause a non-moving object to start moving.

Explanation:

Friction is a force that exerts oppositely from an objects motion, mostly by its surface. The smoothness and roughness of the surface depends on how much friction it has, friction is a type of force.

Unbalanced forces are what causes objects that aren't moving to move. For example, wind causes a kite to sway in the sky. Wind, in this situation, is the source of unbalance force.

Based on the equations e=hv and e=hc/^lambda, we can say that energy increases as frequency increases. Therefore, FM radio waves with a frequency of 1.015 x 10^8 Hz (101.5 MHz) have less energy compared to visible green light with a frequency of 5 x 10^14 Hz.

To understand this better, we can look at the frequency and wavelength of both the FM radio waves and visible green light. FM radio waves have a lower frequency of 1.015 x 10^8 Hz (101.5 MHz) and a longer wavelength of approximately 3 meters, while visible green light has a higher frequency of 5 x 10^14 Hz and a shorter wavelength of approximately 500 nanometers.

Since energy is directly proportional to frequency and inversely proportional to wavelength, we can conclude that visible green light has higher energy compared to FM radio waves. This is because visible green light has a higher frequency and a shorter wavelength, which means that it carries more energy per photon.

In summary, visible green light with a frequency of 5 x 10^14 Hz has higher energy compared to FM radio waves with a frequency of 1.015 x 10^8 Hz (101.5 MHz) due to its higher frequency and shorter wavelength.

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Motion parallax is a cue to depth which depends exclusively on object motion. So, the correct option is (a).

When an observer moves laterally, it causes the relative motion of objects at various distances, which gives birth to the monocular depth cue known as motion parallax. Several eye movement systems are active as the observer translates, maintaining attention on a specific object in the scene.

The term "motion parallax" describes how objects that are moving across the frame at a constant speed may appear to move more when they are closer to the observer (or camera) than when they are farther away.

Therefore, motion parallax is a cue to depth which depends exclusively on object motion. So, the correct option is (a).

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Answer:

Balanced forces do not result in any change in motion.

Explanation

forces applied to an object in opposite directions that are not equal in size. Unbalanced forces result in a change in motion. friction the force that opposes the motion or tendency toward motion of two objects that are in contact.

Answer:

balanced forces are equal in size and opposite in direction

Answer:

1 friction produces heat which damages the moving part of a machine

2 a lot of energy is wasted In overcoming the friction before an object starts moving

3 friction produces wear and tear on the contacting surfaces

Answer:

Heloo you there

Explanation:

Answer:

9)a

10) I think true

11)b

Explanation:

9)a. because it's told that the car is slowing down, the sum of the forces that are towards left, should be more than the ones that are towards right. if the car was gaining speed, "b" would have been correct. and if it was told that the car is moving without a change in the speed, "c" would have been correct.

10) if a moving object has a change of speed or direction, it would have an acceleration. now if a moving object experiences an unbalanced force, it'd either slow down, gain speed or change direction, and in all of the three possibilities it'd have an acceleration.

11) upward and downward forces are equal, and the sum of them would be 0N(because they have opposite directions). so they negate each other.

and the rightward force is 5N more than the leftward force. so the Net Force would be 5N.

-30+30-10+15=5N

if it is unclear or you need more explanation, ask freely.

The geographical regions in different parts of the world are always characterized by different average temperatures during different given periods of time. Moreover, these average temperatures may increase or decrease, which depends on a lot of external geographical factors. The data representing the same has been mentioned above.

Since in 1880, the oceans can be sorted from largest to smallest based on their average temperature change. The order can be kept as-

1. Northern Canada

2. Western Europe

3. Australia

4. Southern Africa

5. Eastern Pacific Ocean

6. Antarctic Ocean

Therefore, the above order is the descending order of the area based on change in the temperature.

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Answer:

Explanation:

The kinetic energy of an object can be found by using the formula

\(k = \frac{1}{2} m {v}^{2} \\\)

m is the mass

v is the velocity

From the question we have

\(k = \frac{1}{2} \times 1000 \times {26}^{2} \\ = 500 \times 676 \\ = 338000\)

We have the final answer as

Hope this helps you

The overestimated distance traveled between t=0 and t=5 is 158 meters.

To estimate the distance traveled, we can use the trapezoidal rule to approximate the area under the curve of the velocity function v(t). The trapezoidal rule divides the interval [0, 5] into subintervals with a width of 1 second and approximates each subinterval as a trapezoid. The formula for the trapezoidal rule is ∫[a,b] f(x) dx ≈ ∑[(i=1 to n)] [f(x_i-1) + f(x_i)] * Δx / 2, where Δx is the width of each subinterval.

Using this formula, we can calculate the overestimated distance traveled:

s ≈ [f(0) + 2f(1) + 2f(2) + 2f(3) + 2f(4) + f(5)] * Δt / 2

≈ [0 + 2(1^2 + 6) + 2(2^2 + 6) + 2(3^2 + 6) + 2(4^2 + 6) + (5^2 + 6)] * 1 / 2

≈ 158 meters.

This provides an overestimate of the distance traveled between t=0 and t=5.

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Answer:

A.

Explanation:

Answer:

Newton believed that mass tells gravity how much force to exert. Einstein believed that mass tells space-time how to curve.

Explanation:

Isaac Newton believed that bodies on earth had a force of gravity pulling them down as a result of their masses.

Albert Einstein believed that the bodies were not pulled down but were moving around in a circular sphere/manner.

This confirms Newton believing that mass tells gravity how much force to exert and Einstein believing that mass tells space-time how to curve.

Answer:

first one is for the assignment second is for the quiz

Explanation:

Assignment - C.

Quiz - D.