How much energy is lost to a dissipative drag force if a 60-kg person falls at a constant speed for 15 meters?.

The momentum of the system after the Collison have been obtained as  0.20 kg-m/s south.

According to the principle of the conservation of linear momentum, we know that the momentum before collision is equal to the momentum after collision.

In this case, we can see that the two ball are moving in the opposite direction thus the velocity vectors are directed in opposite directions. We would now try to be able to obtain the momentum of the system after the Collison as;

Momentum of the ball moving south - Momentum of the ball moving north

Thus;

0.17 kg(2.8 m/s -  1.6 m/s)

Total momentum of the system =

0.20 kg-m/s south

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Answer:

5 m/s

Explanation:

Mass of the boy + scooter system =  35 kg

Kinetic Energy =  437.6 J

437.6 = \(\frac{1}{2} 35 {v}^2\)

25.0057143 = \(v^{2}\)

v = 5 m/s

Answer: 1.1 x 10^-10 C

Explanation:

Answer:

1.1 x 10^-10 C

Explanation:

on edg 21

Answer:

It allowed J.J. Thompson to discover electrons which are a part of atoms.

The potential energy will be 180J

By going through the formula of potential energy that is U=mgh

where, U= Potential energy

m= mass

g= gravitational feild

h= height

Now as per the question,

Initial velocity, u = 6 m/s

Final velocity, v = 0 m/s

Acceleration due to gravity, g = -5 m/s²

(The negative sign implies that the object is moving downwards)

To find the value of Height, we need to use the relation,

v^2 - u^2 = 2gh

0 - 36 = -10h

h = 36/10 m

Height = 18/5 m

therefore, Potential Energy(U) = mgh

                                              = 10 × 5 × 18/5 J

                                              = 180 J

Therefore, the ball will have a potential energy of 180 J when it is at its highest point.

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The maximum possible speed of the train at the end of the first 4.0 km of the journey is 0 m/s.

To calculate the maximum possible speed of the train at the end of the first 4.0 km of the journey, we can apply the principle of conservation of energy.

Assuming there are no external forces like friction or air resistance, the initial potential energy of the train will be converted into kinetic energy.

The potential energy (PE) of the train at the beginning of the journey can be calculated as PE = mgh, where m is the mass of the train, g is the acceleration due to gravity (approximately \(9.8 m/s^2\)), and h is the height difference (in this case, we assume it to be zero).

The kinetic energy (KE) of the train at the end of the 4.0 km journey can be calculated as \(KE = (1/2)mv^2\), where v is the velocity of the train.

Since the potential energy is converted into kinetic energy, we can equate the two expressions:

PE = KE

\(mgh = (1/2)mv^2\)

Simplifying and canceling out the mass:

\(gh = (1/2)v^2\)

Substituting the values, \(g = 9.8 m/s^2\)and h = 0, we get:

\((9.8 m/s^2)(0) = (1/2)v^2\)

Simplifying further:

\(0 = (1/2)v^2\)

This equation tells us that the maximum possible speed of the train at the end of the first 4.0 km of the journey is 0 m/s.

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Answer:

10hr

Explanation:

To get time of journey, we need calculate distance/speed. distance is 600, speed is 60, so answer is 600/60=10(hours)

Hope that this was helpful.

There are various difficulties that people can encounter while making accurate measurements. Some of these include: using inaccurate or faulty instruments, misreading the scale or not taking the measurement from the correct position, inadequate lighting or environmental conditions that can affect the measurement, and lack of proper training or understanding of the measuring technique.

When making accurate measurements, several difficulties may arise.

First, human error can occur due to factors such as misreading scales, misjudging endpoints, or inconsistent techniques.

Next, instrument error may contribute to inaccuracies due to calibration issues, wear and tear, or manufacturing defects.

Environmental factors, such as temperature, humidity, or air pressure, can also affect measurements.

Furthermore, parallax error may happen when the observer's eye is not directly aligned with the measurement scale, leading to a skewed reading.

Lastly, the limitations of the measuring device itself, like its resolution and least count, can limit the accuracy of measurements.

Overcoming these difficulties requires attentiveness, proper calibration and maintenance of instruments, and using suitable tools and techniques for the specific measurement task.

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Explanation:

Momentum = mass × Velocity

p = 62×73

p =4526

With that said, we ALL SHOULD KNOW that life on Earth is dependent on the light and heat that it receives from the Sun. If the Sun's mass abruptly halved, it would certainly have a huge impact on these key points; it would grow cooler and redder and eventually transform into a red dwarf.    

or

d If for any reason the Sun shrank smaller than the Earth at least, then this shrunken Sun wouldn't have the mass to create fusion and would burn out completely. Our solar system would lose its only star. ... Earth's mass would be at least 333,000 times bigger than it is now. Imagine the gravity that the planet would have. I think from what i read and learned a bit more of the SUn.!

To find the value of the resistance, we can use the formula for the voltage across a capacitor as it discharges through a resistor: V(t) = V0 * e^(-t/RC)

where V0 is the initial voltage across the capacitor, R is the resistance, C is the capacitance, and t is the time.
From the figure, we can see that the initial voltage across the capacitor is 30 V and the capacitance is 100 muF (or 0.0001 F). We can also see that it takes approximately 0.6 seconds for the voltage across the capacitor to decrease to 10 V.
Using these values, we can plug them into the formula and solve for R:
10 = 30 * e^(-0.6/RC)
R = -0.6 / (C * ln(10/30))
R = -0.6 / (0.0001 * ln(1/3))
R = 1,813.3 ohms
Therefore, the value of the resistance is approximately 1,813.3 ohms.

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Answer:

ecosystem; hurricanes and tornadoes; catastrophic events.; Fooding; moving water; soil

Explanation:

After using the word bank to fill in the blanks in the passage, the passage reads;

"The organisms and environments that make up a community called an ecosystem are constantly changing. Sudden and violent events, such as hurricanes and tornadoes that often cause these changes are called catastrophic events. Fooding results when rainfall exceeds the holding capacity of a drainage system. The energy of the  fast-moving water and the layers of sediment carried by it  can uproot or bury plants, reshape the soil and destroy  roads and buildings."

Answer:

car travel

precipitation

O temperature

Explanation:

Jet streams which is the ability of the object to move at a high speed due to its power is common among some given set of objects. Some are powered by the objects fuel while others are entirely different.

The above given options are actually affected by the jet streams.

Answer:

B. precipitation

C. temperature

Explanation:

this is late but for anyone that's looking for this, hope this will help! :D

According to Archimedes' principle, the volume of the liquid displaced when the body is totally immersed in the liquid is equal to the volume of the body.

The volume of the body is equal to the volume of the immersed portion.

Thus, the volume of the liquid displaced is equal to the volume of the immersed portion of the body.

Hence, option B is the correct answer.

It can take anywhere from 30 minutes to an hour for boiling water to cool to 70 degrees Fahrenheit, depending on the environment and the amount of water being cooled. To cool it faster, place it in a shallow container and stir it occasionally.

To determine how long it takes for boiling water to cool to 70 degrees, you need to know the starting temperature of the water and the cooling conditions. Assuming you are referring to boiling water at 100 degrees Celsius (212 degrees Fahrenheit) and cooling to 70 degrees Celsius (158 degrees Fahrenheit), the cooling process will depend on factors such as the volume of water, the container material, and the surrounding environment.
Here's a general outline of the cooling process:
1. Start with boiling water at 100 degrees Celsius.
2. Remove the heat source and let the water cool naturally.
3. As the water cools, its temperature will decrease.
4. Observe or measure the temperature until it reaches 70 degrees Celsius.
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Answer:

No

Explanation:

Acceleration is the rate of change in velocity. Here the car maintains a constant speed, no change in velocity

The science of "statics" is defined option a- by zero acceleration.

Statics is a branch of mechanics that deals with the analysis of forces and their effects on objects that are either at rest or moving at a constant velocity. In statics, the focus is on the equilibrium of forces, which means that the net force acting on an object is zero.

This leads to the definition of statics as the branch of mechanics that deals with zero acceleration. In other words, if an object is at rest or moving at a constant velocity, then the net force acting on it must be zero. This is a fundamental principle of statics, and it is used to analyze a wide range of problems, from the stability of structures to the behavior of fluids. The origins of statics can be traced back to ancient Greece, but it was developed further during the Enlightenment period in Europe, particularly by scientists such as Galileo and Newton. Therefore correct option is A.

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Answer:primary,secondary and surface waves I do believe

Explanation:

The energy of a photon of x-ray radiation with a frequency of \(4.43*10^{18} s^-1\) is \(2.93*10^{-10} J\).

The energy of a photon is directly proportional to its frequency, as given by the formula E = hf, where E is energy, h is Planck's constant, and f is frequency. To calculate the energy of a photon of x-ray radiation with a frequency of \(4.43*10^{18} s^{-1}\), we can substitute the given values in the formula to get:

\(E = hf = (6.626*10^{-34} Js) * (4.43*10^{18} s^{-1}) = 2.9310^{-10} J\)

Therefore, the energy of a photon of x-ray radiation with a frequency of \(4.43*10^{18} s^{-1}\) is \(2.93*10^{-10} J\).

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Answer:

D

Explanation:

A: Velocity has direction. Once the car changes direction, the velocity is no longer a constant.

B: The direction makes B untrue

C: r = 40 miles / 2/3 hour = 60 miles/hour

   r2 = 30 miles / 1/2 hour = 60 miles / hour

The car is not decreasing its speed. C is false.

D:  Speed does not have a direction. D is true.

Explanation:

im listening to metallica

turn the page

 The acceleration of each cart be 4 meter/second².

Acceleration is rate of change of velocity with time. Due to having both direction and magnitude, it is a vector quantity. Si unit of acceleration is meter/second² (m/s²).

Given parameters:

the average force on the 1kg cart is 4N.

Hence, the acceleration of the 1 kg cart be = force/mass

= 4/1 meter/second²

= 4 meter/second².

As two carts are pushed apart by an expanding spring, the acceleration of the other carts also be 4 meter/second².

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The time taken for the coffee to cool from 93°C to 73°C is approximately 36.1 minutes.

The cooling law is given by:

$$\frac{dQ}{dt}=-k(T-T_0)$$

where Q is the heat in the object, t is the time taken, T is the temperature of the object at time t, T0 is the temperature of the environment and k is a constant known as the cooling constant.

We need to find the time it takes for the coffee to reach a drinking temperature of 73°C given that its initial temperature is 93°C.

Therefore, we need to find the time it takes for the coffee to cool down from 93°C to 73°C when placed in a room temperature of 18°C.

Let’s assume that the heat energy that is lost by the coffee is equal to the heat energy gained by the environment. We can express this as:

dQ = - dQ where dQ is the heat energy gained by the environment.

We can substitute dQ with C(T-T0) where C is the specific heat capacity of the object.

We can rearrange the equation as follows:

$$-\frac{dQ}{dt}=k(T-T_0)$$

$$-\frac{d}{dt}C(T-T_0)=k(T-T_0)$$

$$\frac{d}{dt}T=-k(T-T_0)$$

The differential equation above can be solved using separation of variables as follows:

$$\frac{d}{dt}\ln(T-T_0)=-k$$

$$\ln(T-T_0)=-kt+c_1$$

$$T-T_0=e^{-kt+c_1}$$

$$T=T_0+Ce^{-kt}$$

where C = e^(c1).

We can now use the values given to find the specific value of C which is the temperature difference when t=0, that is, the temperature difference between the initial temperature of the coffee and the room temperature.

$$T=T_0+Ce^{-kt}$$

$$73=18+C\cdot e^{-0.09t}$$

$$55=C\cdot e^{-0.09t}$$

$$C=55e^{0.09t}$$

$$T=18+55e^{0.09t}$$

We can now solve for the value of t when T=93 as follows:

$$93=18+55e^{0.09t}$$

$$e^{0.09t}=\frac{93-18}{55}$$

$$e^{0.09t}=1.3636$$

$$t=\frac{\ln(1.3636)}{0.09}$$

Using a calculator, we can find that the time taken for the coffee to cool from 93°C to 73°C is approximately 36.1 minutes.

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Answer:

a = (V2 - V1) / t     average acceleration between points 1 & 2

V2 = speed at bottom = -4.8 m/s

V1 = 4.8 m/s     speed when thrown, choosing upwards as positive

a = (-4.8 - 4.8) / .98       time upwards = time downwards

a = -9.6 m/s / .98 s

a = -9.8 m/s^2

Answer:

round and count

Explanation:

means arrange, order, organize, etc

Answer:^what he meant was record and count

Explanation:

Answer:

1080000

Explanation:

300 x 60s=18000m/minute

18000 x 60min=1080000m/h

a = G M / R^2    gravitational acceleration

R^2 = G M / a = 6.67E-11 * 5.98E24 / 5.6 m^2/s^2

R^2 = 6.67 * 5.98 / 5.6 E13 = 71.2E12

R = 8.44E6 m

H = (8.44 - 6.37) E6 m = 2.07E6m   above the surface of the earth

(About 1/3 of the radius of the earth)

As a check 4/3^2 = 1.78

9.8 m/s^2 / 1.8 = 5.4    Close enough to 5.6

The frequency of red light, which has a wavelength of around 6.35 * 10 ^ 7 - 7 m, is 4.77 * 10 ^ 14 Hz.

Wavelength is the distance between two successive crests or troughs of a wave, such as a sound wave or light wave. It is usually measured in meters, centimeters, or nanometers. Wavelength is an important factor in determining the properties of a wave, such as its frequency or velocity. Wavelength is inversely proportional to frequency—the higher the frequency, the shorter the wavelength.

This means that the frequency of red light is 4.77 * 10 ^ 14 cycles per second. The frequency of light is directly proportional to its wavelength, so when the wavelength increases, the frequency decreases. This is why red light has a lower frequency than other colors of light, like blue and green, which have higher frequencies.
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To produce 5.0 mW (milliwatts) of emitted light from a red LED, a current is required. The necessary current to achieve this is approximately 0.189 A (amperes).

In a red LED, as electrons flow through the diode, they transition between energy states, emitting photons in the process. Each electron that passes through the diode emits a single photon with a wavelength of 630 nm.

The emitted power is given as 5.0 mW, and we can calculate the number of photons emitted per second using the energy per photon and the given power. By equating this number of photons emitted per second to the current flowing through the diode, we can find the necessary current to produce 5.0 mW of emitted light.

The current required to generate the desired power output is influenced by the efficiency of the LED and the energy per photon emitted by each electron passing through the diode. By calculating the number of photons emitted per second and equating it to the current, we can determine the necessary current to achieve the desired 5.0 mW of emitted light.

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The average force that acts on the driver is equal to 1100N.

The equations of motion have described the relationship between the velocity, acceleration, time, and displacement of a moving object.

The mathematical expressions of the equations of motions can be written as:

\(v= u+at\)

\(S = ut+\frac{1}{2}at^2\)

\(v^2-u^2=2aS\)

Given, the automobile is traveling with velocity, u = 72 Km/hr = 20m/s

The final velocity of the automobile, v = 0

The time for which the driver comes to rest, t = 0.10 sec

From the 1st equation of motion: v = u + at

0 = 20 + a (0.10)

a = - 200 m/s²

The mass of the driver, m = 55 Kg

The average force, F = ma = 55 × 20 =  1100 N

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