a 66-kg skier starts from rest at the top of a 1200-m-long trail which drops a total of 170 m from top to bottom. at the bottom, the skier is moving 11 m/show much energy was dissipated by friction?

Explanation:

F = k |q1| |q2| / r^2

k = 9 * 10^9

q1 = - 2.5 C

q2 = 2 C

r = 100

r^2 = (10^2)^2 = 10^4

F = (9*10^9) * ( 2.5 ) ( 2) / ( 100)^2

F = 45* 10^9 / 10^4

F = 45 * 10^9 * 10 ^ -4 = 45 * 10^5 N

F = 45 * 10 ^ 5 N

The spectrum observed from the Sun (or any star) would exhibit an absorption spectrum. This is because the outer gaseous atmosphere of the star absorbs specific wavelengths of light, resulting in dark absorption lines in the spectrum.

In the cooler, lower-density outer atmosphere, where white light from the star travels, some atoms or molecules in the atmosphere absorb photons with particular energy. In the spectrum, these absorptions show up as black lines at specific wavelengths. The specific set of absorption lines that each element or molecule generates results in a distinctive pattern that can be used to identify the elements that are present in the star's atmosphere.

The absorption spectrum offers insightful data on the chemical make-up and physical characteristics of the star. Astronomers can ascertain the elements present, their abundances, and other characteristics like the temperature, pressure, and velocity of the star's atmosphere by examining the absorption lines.

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Answer:10cm x 25cm

Explanation:

i got it wrong so you could get it right

Answer:derp

Explanation:

Answer:

I don't know how to show the work but I just had this question and the answer is 9.24kg.

Explanation:

According to the Skygazer's Almanac for 2022 at 40 degrees, Venus and Saturn will be in opposite parts of the sky on December 17, 2022.

The Skygazer's Almanac provides astronomical information for a specific location and year. In this case, at a latitude of 40 degrees, the almanac indicates that Venus and Saturn will be in opposite parts of the sky on December 17, 2022. This means that Venus and Saturn will appear at opposite sides of the celestial sphere as observed from Earth. However, it's important to note that the almanac's predictions are approximate and can be influenced by various factors, including atmospheric conditions and the observer's specific location. To obtain the most accurate and up-to-date information, it is recommended to consult more recent astronomical sources or use specialized software that can provide precise positions and dates for celestial events.

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Answer:

Yes, one of them made a mistake

Explanation:

Even though, the two values obtained in the measurements are close, the student that reported 3.01 m made a mistake.

A meter rule that is calibrated in meters (m) will only have an accuracy of 0.1 m, hence can be read as 3.0 m, 3.1 m, 3.2 m, 3.3 m and so on. A meter rule that is calibrated in meters cannot provide accuracy of up to 0.01 m, hence the student that reported 3.01 m could not have been sure of the .01 added as it couldn't have been read on the meter rule.

NOTE: A meter rule (popularly known as ruler) is an instrument that is used in the measurement of the length of an object. It can be calibrated in centimeter, inch or meter.

1) when we light a matchstick,the energy which got consumed in while rubbing the matchstick against the surface,turns into heat and hence ,it lights , therefore,the energy gets transferred from one type to another which proves the law of conservation of energy.

2) The coal gets burn and generate into electricity which further used by us for various purposes like lighting lamp and since the energy gets transferred from one source to another instead of ceasing, it proves the statement of conservation of energy.

3) As the pendulum swings in air , it continues to move from one point to another, changing potential energy to kinetic energy due to the motion that's taking place and unless an external force interferes, it's speed won't increase as at some point due to the friction by air will resist the movement resulting in decresement of kinetic energy and increased potential energy, thus ,at some point it will come to rest .

4) No ,it doesn't , because due to the force of friction,the disturbance in the movement of it ,takes place, making it stop at a specific point after some time.

5) As the pendulum swings in air , it continues to move from one point to another, changing potential energy to kinetic energy due to the motion that's taking place and unless an external force interferes, it's speed won't increase as at some point due to the friction by air will resist the movement resulting in decresement of kinetic energy and increased potential energy, thus ,at some point it will eventually come to rest .

6)

7)

8) In the previous problem ,the kinetic energy increases as continues rolling and the potential energy decreases in this process of prolongation of the movement ,while ,when an object comes to rest after the process of moving or falling, it's potential energy is at the highest while the kinetic energy is just the opposite .

9)

10)

11)

In perfectly elastic collision, there's no loss of energy, hence ,the energy that got used up in the starting to bounce the ball ,will remain the same throughout the whole collision and the height would be the same 6 meters and kinteic energy would be 117.6J

Answer:

The frame of reference is  the user (or ground) frame.

One must be careful about the direction of the wind because the problem indicates the wind is blowing "toward" the South whereas a South wind on the weather channel would indicate a wind coming from the South or a wind blowing northward.

The speed of the wind blowing southward at 75.0 km/hour is measured in a stationary frame of reference, as this allows for an accurate and consistent measurement of the wind speed. the speed is measured relative to a fixed point that is not moving.

The choice of frame of reference can affect the measurements of speed and other physical quantities.

In the case of the wind speed, if the frame of reference is moving, such as a person walking or a car driving, the measured speed would be different due to the combined motion of the observer and the wind. Therefore, to obtain an accurate measurement of the wind speed, it is necessary to use a stationary frame of reference.

Hence,  the speed of the wind blowing southward at 75.0 km/hour is measured in a stationary frame of reference, as this allows for an accurate and consistent measurement of the wind speed.

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The velocity of fragment 2 is equal to 0.88 m/s at 31°.

From the law of conservation of momentum, the sum of the momentum before and after the collision must be equal.

m₁ u₁ + m₂.u₂ = m₁ v₁ + m₂.v₂

where m₁ & m₂ is the mass of the collided objects, u₁ & u₂ are their initial speed while v₁ & v₂ is their final speed.

Given, the mass of the spring, m = 1.2 kg

The speed of the spring, v = 0.50 m/s

The mass of the first fragment, m₁ = 0.4 kg

The initial speed of fragment 1, u₁ = 0.9 m/s

The mass of the fragment, m₂ = 1.2 - 0.4 = 0.8 kg

In x-direction: \(mucos\theta = m_1v_1 cos\theta + m_2 v_2 cos\theta\)

1.2 ×0.5 ×cos(0) = 0 + 0.8× v₂ cosθ

v₂ cosθ = 0.75

In y-direction: 12 (0) = -0.4(0.9) + 0.8  v₂ sinθ

v₂ sinθ = 0.45

Now, \(\displaystyle \frac{v_2sin\theta}{v_2cos\theta} =\frac{0.45}{0.75}\)

tanθ = 0.6

θ  = 31°

The value of the velocity of the fragment can be calculated as;

v₂ sinθ = 0.45

v₂ sin31 = 0.45

v₂ = 0.88 m/s

Thus, the magnitude of the velocity of fragment 2 is 0.88 m/s at 31⁰.

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This is due to the fact that occluded fronts combine two cold air masses, which causes one of the cold air masses to go downward.

When a warm air mass is sandwiched between two cold air masses, an occluded front occurs. In an occlusion, the warm front passes over the cold front, which dives beneath it.

In a front is obscured, the warm front is fully supplanted by the cold front, in which the warm air masses have completely disappeared. Furthermore, there are frequent shifts in the various weather producing circumstances because of the cold front's relatively low temperature.

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Answer:(d) mass

Explanation: The kilogram is the standard mass unit that is used almost globally and is the SI unit of mass. The kilogram weighs 9.8 Newtons under normal conditions on the surface of the Earth, and Newton is the corresponding SI unit of force and weight.

Option B,C and D shows the three ways does the pattern seen on the screen during a double-slit experiment.

The double-slit experiment shows that light and matter are with properties that are both of waves and particles, as well as it has the essentially probabilistic nature of quantum mechanical processes.

Huygens' Wave Model of Light considers light behaving as a longitudinal wave. Huygens stated light's propagation as a wave's direction of travel. He proposed that the nature of light is similar to observing the motion of water surfaces.

The three ways does the pattern seen on the screen during a double-slit experiment support the wave model of light;

B. The light bends around the edges of the slit.

C. There are bands of dimmer light.

D. There are bands of brighter light.

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Answer:

624.26

Explanation:

63.7 kg x 9.8 (force of gravity) = 624.26N

The weight of a person is the normal fore acting on it by gravitation. It is the product of mass and acceleration due to gravity. The weight of the person with 63.7 kg person is 624.96 N.

Gravitational force is the force by which an object attracts other objects into its center of mass. Earth attracts every objects on its surface and that is why we are all standing on the ground.

The gravitational force depends on the mass of the object and distance from the source of force. Thus when we go to space we experience no gravitational force and thus no weight.

The weight of an object is the product of its mass and acceleration due to gravity g of earth.

g of earth = 9.8 m/s²

Then, the weight of a 63.7 kg person = 63.7 kg ×  9.8 m/s² = 624.96 N.

Therefore, the weight of the 63.7 kg person is 624.96 N .

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Answer:

It's a pretty simple suvat linear projectile motion question, using the following equation and plugging in your values it's a pretty trivial calculation.

V^2=U^2+2*a*x

V=0 (as it is at max height)

U=30ms^-1 (initial speed)

a=-g /-9.8ms^-2 (as it is moving against gravity)

x is the variable you want to calculate (height)

0=30^2+2*(-9.8)*x

x=-30^2/2*-9.8

x=45.92m

Answer:

35

Explanation:

dfddffffffffffffdddfr

Answer:

a)the process by which heat or electricity is directly transmitted through the material of a substance when there is a difference of temperature

b)the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat

c)radiation is the emission or transmission of energy in the form of waves or particles through space or through a material medium.

The variables that Lizette should keep the same between the control group of weeds and the sprayed weeds include : type of weed, age and size of the weeds, amount of sunlight and water , location of the weeds and amount and frequency of spraying.

The variables that Lizette should keep the same between the control group of weeds and the sprayed weeds include:

The type of weed: To ensure that the control group of weeds and the sprayed weeds are comparable, Lizette should use the same type of weed in both groups.

The age and size of the weeds: Lizette should select weeds of similar age and size for both groups, as larger or older weeds may be more resistant to the vinegar solution.

The amount of sunlight and water: The amount of sunlight and water that the control group of weeds and sprayed weeds receive should be same, as these factors can affect plant growth and health.

The location of the weeds: The control group of weeds and the sprayed weeds should be located in same area of the garden, as differences in soil composition or other environmental factors could affect the results.

The amount and frequency of spraying: Lizette should apply the same amount of water to the control group of weeds as she applies vinegar solution to the sprayed weeds, and frequency of spraying should also be  same.

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The speed of the raft when the 40 kg boy dives horizontally off it at a speed of 4.0 m/s is 0.60 m/s.

According to the law of conservation of momentum, the total momentum before the boy jumps off the raft is equal to the total momentum after he jumps off. The momentum of an object is given by the product of its mass and velocity.

Let the initial velocity of the raft be v (which is what we need to find), and the final velocity of the boy be v_boy = 4.0 m/s. The mass of the boy is 40 kg, and the mass of the raft is 600 kg.

Before the boy jumps off, the total momentum is the sum of the momentum of the boy and the momentum of the raft. After the boy jumps off, the momentum of the boy becomes zero, and only the momentum of the raft remains.

The initial momentum is given by the product of the mass and velocity of the boy: momentum_initial = 40 kg * 4.0 m/s.

The final momentum is the product of the mass and velocity of the raft: momentum_final = 600 kg * v.

Since momentum is conserved, we can equate the initial momentum to the final momentum: momentum_initial = momentum_final.

40 kg * 4.0 m/s = 600 kg * v.

Simplifying the equation, we find: v = (40 kg * 4.0 m/s) / 600 kg.

Calculating this, we get v ≈ 0.2667 m/s, which can be rounded to 0.26 m/s.

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A polygon with only one set of parallel sides is called a trapezoid. The parallel bases of a trapezoid are another name for these parallel sides. Trapezoids have two additional sides that are not parallel and are referred to as their legs. The value of x is 12.

A four-sided shape called a trapezoid has one pair of parallel sides. It fundamentally resembles a square, rectangle, or parallelogram in two dimensions. So, like other shapes, this one has a boundary and an area.

There are some Mid-segment characteristics :

Now, according to the diagram, make an equation :

5x-20 = [(2x+6) + (4x+2)] / 2

5x-20 = (6x+8)/2

5x-20 = 3x+4

5x-3x = 20+4

2x = 24

x = 12

Hence, the value of x is 12.

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\(Nth\) =\(\frac{W net, out}{Qh}\)

50MW is our net output.

Then, we plug it in.

= \(\frac{50MW}{150MW}\) = 0.333 or 33.33%

W net, out = Qh - Ql

Ql = Qh - W net,out

Plug the values in.

Then, it becomes:

= 150MW - 50 MW

= 100MW

Thus, the cycle thermal efficiency is 33.33% and the heat rejected is 100MW.

100 MW of the cycle thermal efficiency and the heat is thermal energy rejected by the cycle to the surroundings.

The energy present in a system that determines its temperature is referred to as thermal energy. Thermal energy flows as heat. Thermodynamics is a whole field of physics that studies how heat is transmitted across various systems and how work is performed in the process.

N = W/Q

50 MW is our net output.

Then, we plug it in.

= 50/150  = 0.333 or 33.33%

W net, out = Qh - Ql

Ql = Qh - W net,out

Plug the values in.

Then, it becomes:

= 150 MW - 50 MW

= 100 MW

Thus, the cycle thermal efficiency is 33.33% and the heat rejected is 100 MW

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The correct answer is e. None of the above alternatives gives a true statement. None of the statements in options a, b, c, and d are true when it comes to a modulus M over a ring R having a finite basis.

When a modulus M can be formed entirely from a finite set of elements, the modulus M is said to be finitely generated. M's finite basis does not, however, automatically imply that M is finitely generated. A basis is a set of linearly independent elements, and it might not be enough to produce all of the components of the modulus.

According to the assertion in option b, M must include nonzero items of nonzero order if it has a finite basis. This is untrue, though. The smallest positive number k, such that the element raised to the power of k equals the identity element, is referred to as the order of an element.

According to option c, every non-null element in a modulus with a finite basis has a null. Nevertheless, this claim is likewise untrue. It is possible for a modulus with a finite basis to have non-null elements without a null element.

According to option d, a ring R is a body, or a field, and only then can a modulus have a finite basis. However, this assertion is also untrue. Even though the ring R is not a field, a modulus can nonetheless have a finite basis. None of the given alternatives provides a true statement about a modulus M over a ring R having a finite basis.

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Explanation:

mass of earth (m1)=5.97×10^24

mass of moon (m2)=7.35×10^22

distance between their center (d)= 3.84×10^8

G=6.67×10^-11

now,

gravitational force =(F)= G(m1×m2)/d²

true

Explanation:

this is because melting point and boiling point decreases down the group because they are held together by attractions between positive nuclei and delocalised electrons

Answer:

A

Explanation:

The force of friction on the box is equal to 49 N.

Frictional force can be described as the force produced by two surfaces that contact and slide against each other. These forces are affected by the surface texture, the angle, and the position of the object.

Friction can be described as the force that prevents motion when the surface of one object comes in contact with the surface of another. The mechanical advantage reduced by friction is the ratio of output to input is decreased because of friction.

The fractional force can be represented as:

F = μ mg

Given, the mass of the crate, m = 10 Kg

The coefficient of friction between the box and the surface = 0.5

The gravitational acceleration, g = 9.8 m/s²

The frictional force, F = 10 ×0.5× 9.8 = 49 N

Therefore, the frictional force on the box is 49 N.

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Sian wants to count the number of seconds it takes for a beaker's contents to become purple from clear. She should utilize a stopwatch as her instrument for this job.

Watch that, when turned on and off, measures the amount of time that has passed since a specific time.

Sian wants to measure the number of seconds that it takes for the contents of a beaker to change from clear to purple. Stopwatch is the tool she should utilize for this purpose.

Hence, option B is correct.

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Answer: Sian wants to count the number of seconds it takes for a beaker's contents to become purple from clear. She should utilize a stopwatch as her instrument for this job.

option b

Explanation:

The amount of force required to hold the ball completely submerged under water is 0.025N.

The diameter of the ball is 3.87 cm.

So, the radius of the ball is 1.935cm. The density of the ball is 0.0845 g/cm³.

The force required to hold the ball completely submerged under water will be equal to the the buoyancy on the body,

The buoyancy on the body is given as,

B = pVg

B is the buoyancy,

p is the density of the body,

V is the volume of the ball,

g is the acceleration due to gravity.

So, putting values,

B = 4π(0.01935)³(84.5)(9.8)/3

B  = 0.025N.

So, the amount of force required is 0.025N.

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To find the center of mass of an irregular shape using

String- for hanging at the center

• A small mass - hung from the string

• A stand-holding up the string

• A pencil pinpointing the center

• A straight-edge- Identify the middle

Generally, a point indicates the mean location of the matter in a body or system.

In conclusion, the center of mass also indicates a point at which the body is most balanced under gravity.

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The average force applied to the person when he stopped by a padded dashboard is 166×10⁴ N.

An external force is an agent that has the power to alter the body in moving or resting conditions. It can also be described as a push or a pull. It is a vector quantity so it has both direction and magnitude.

The formula to calculate the force applied on an object is F=m×a. Where F is force, a is the acceleration, and m is the mass of an object,

Given mass (m) is 83 kg, initial velocity (u) is 20 m/s, and displacement (s) is 1 cm.

When the dashboard is compressed to stop a car, then the acceleration is calculated using the formula v²=u²+2as where v is final velocity, u is initial velocity, a is acceleration, and s is displacement. Initially, the final velocity is zero. Solving we get,

\(\begin{aligned}0&=u^2+2as\\u^2&=-2as\\20^2&=-2\times a\times0.01\\a&=\mathrm{-20000\;m/s^2}\end{aligned}\)

The negative sign indicates that the car is slowing down or decelerating.

The average force on the person riding the car is given by,

\(\begin{aligned}F&=83\times 20000\\&=\mathrm{166\times 10^4\;N}\end{aligned}\)

The answer is 166×10⁴ N.

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To provide an output of 40 W, approximately 134 solar cell modules would be necessary.

To determine the size of the solar cell array necessary to provide an output of 40 W, we need to calculate the total power generated by a single solar cell module and then divide 40 W by that power.

In this case:

Voltage (V) = 3 V

Current (I) = 0.1 A

Dimensions: Length (L) = 5.0 cm and Width (W) = 8.0 cm

First, let's calculate the power generated by a single solar cell module using the formula:

Power (P) = Voltage (V) * Current (I)

P = 3 V * 0.1 A

P = 0.3 W

So, a single solar cell module generates 0.3 W of power.

Now, we can determine the number of modules required to provide 40 W of power by dividing the desired output power by the power of a single module:

Number of modules = Desired power / Power per module

Number of modules = 40 W / 0.3 W

Number of modules ≈ 133.33

Since we cannot have a fraction of a module, we would need to round up to the nearest whole number.

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