a styrofoam sphere of radius r has a density rho. you now carefully compress the sphere so its radius is r/2. what is the density of the compressed sphere?

That would depend on how much it weighs

The work done when 3.5 C charge is moved through an electric potential difference of 4.5 V is 15.75 Joules.

The Work done when a charge is moved through an electric potential difference can be calculated using the formula below:

Work (W) = charge (Q) * electric potential difference (V)

W = Q * V

Given:

Charge (Q) = 3.5 C

Electric potential difference (V) = 4.5 V

Substituting the values into the equation:

Work (W) = 3.5 C * 4.5 V

Solve for W:

Work (W) = 15.75 J (Joules)

Therefore, the work done when 3.5 C is moved through an electric potential difference of 4.5 V is 15.75 Joules.

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The right cap would be of the same height as the left cap.

It is said that a particle is in equilibrium when there is no net external force acting on it.

The particle is either at rest or moving uniformly, according to Newton's First Law of Motion, which we can apply to this situation.

According to physics, a system is said to be in equilibrium when neither its internal energy state nor its state of motion tend to change over time.

Concurrent forces are those that operate simultaneously at a given point. When the outcome equals zero, these forces are said to be in equilibrium.

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Answer:

B. protons and neutrons exist inside the atomic nuclei electrons orbit atomic nuclei.

Explanation:

protons are positively charged while neutrons are negatively charged, and electrons orbit the outside like a loner while protons and neutrons get ki-ssy faced inside the nuclei and electrons do have a charge.

Since the box is pulled upward,  work done by gravity is negative, so the answer is (A) -140 J.

Force by which any planet or other body draws objects toward its center is called as gravity.

As ΔPE = mgh

ΔPE is the change in potential energy, m is mass of the box, g is acceleration due to gravity, and h is change in height.

Given : h = 6.0 m sin 37° = 3.6 m

Given, 37° is the angle of the ramp.

As F = ma

F is the force applied to the box (30 N) and a is the acceleration of the box along the ramp. The component of the gravitational force parallel to the ramp is : Fg|| = mg sin θ

θ is the angle of ramp, and is equal to 37° in this case. The force of friction opposing the motion is : Ff = μFg⊥

μ : coefficient of kinetic friction between box and ramp, and Fg⊥ : component of gravitational force perpendicular to ramp : Fg⊥ = mg cos θ

Fnet = Fg|| - Ff = mg sin θ - μmg cos θ

and we know, ma = mg sin θ - μmg cos θ

so, m = a / (g sin θ - μg cos θ)

m = 30 N / [(9.81 ) sin 37° - (0.4)(9.81 cos 37°] = 2.32 kg

ΔPE = mgh = (2.32)(9.81 )(3.6 ) = 81.5 J

Since the box is pulled upward, the work done by gravity is negative, so the answer is (A) -140 J.

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(a) The distance travelled by the object is  100 m.

(b) The displacement of the object in time interval between t = 0 s and t = 10 s is 60 m.

(a) The distance travelled by the object is calculated from the total area of the curve.

total distance = area of triangle 1 + area of triangle 2 + area of rectangle.

total distance = (¹/₂ x base x height)₁ +  (¹/₂ x base x height)₂ + length x width

total distance = (¹/₂ x 6 s x 20 m/s) +  (¹/₂ (8 - 6) 20) + (10 - 0)(10 - 8)

total distance =  60 m + 20 m + 20 m

total distance = 100 m

(b) The displacement of the object in time interval between t = 0 s and t = 10 s is calculated as follows;

displacement = final position - initial position

displacement =  (¹/₂ x base x height)₁ +  (¹/₂ x base x height)₂ + length x width

displacement = (¹/₂ x 6 s x 20 m/s) +  (¹/₂ (8 - 6) (-20)) + (10 - 0)(10 - 8)

displacement = 60 m - 20 m + 20 m = 60 m

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Answer:

a. 24 kg m/s

b.  3/5s

Explanation:

a.impulse is the change in momentum so at first the momentum is zero because the ball was at rest and the final momentum is 1.2kg*20m/s=24 kg m/s

so the impulse would be (24-0) kg m/s=24 kg m/s

b. so the impulse equation is impulse is force *delts time

so 24 kg m/s=40N*t

t=24 kg m/s /40N=3/5 s

The total energy of the isolated system remains at a constant 40 J of energy because energy is conserved in an isolated system.

In an isolated system, no energy is exchanged with the surroundings, meaning the total energy within the system remains constant. In this scenario, when the match is lit, it releases 40 J of heat energy. This energy is transferred to the surrounding air, causing it to warm up. However, the total energy within the isolated system, which includes the match and the surrounding air, remains constant at 40 J.

The statement that the total energy of the isolated system increases or decreases is incorrect because energy is conserved in an isolated system. The statement that the total energy of the isolated system eventually becomes zero once the match goes out is also incorrect because the initial energy release of 40 J is still present within the system.

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Answer:

B

Explanation:

The volume of the reservoir in cubic meters is approximately 432,523.8272 cubic meters.

To calculate the volume of the reservoir in cubic meters, we first need to convert the area of 50 acres to square meters. One acre is equal to 4046.86 square meters, so 50 acres is:

50 acres = 50 x 4046.86 = 202,343 square meters

Next, we need to convert the depth of 7 feet to meters. One foot is equal to 0.3048 meters, so 7 feet is:

7 feet = 7 x 0.3048 = 2.1344 meters

Now, we can calculate the volume of the reservoir using the formula:

Volume = Area x Depth

Volume = 202,343 square meters x 2.1344 meters

Volume = 432,523.8272 cubic meters

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When Lana is gliding across the pond on ice skates. By the time she makes it to the other side of the pond, she has nearly come to a complete stop.  Friction forces has caused her to slow down. Hence option D is correct.

When two surfaces move relative to each other, the friction between them turns kinetic energy into thermal energy (that is, work to heat). As demonstrated by the utilisation of friction caused by rubbing pieces of wood together to ignite a fire, this feature may have severe repercussions. When motion with friction occurs, such as when a viscous fluid is churned, kinetic energy is transformed to thermal energy. Another significant effect of many forms of friction is wear, which can lead to performance deterioration or component damage. The science of tribology includes friction. Ice skates are metal blades affixed to the bearer's feet that are used to drive the bearer across a sheet of ice when ice skating.

Hence option D is correct.

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Answer:

false

Explanation:

false

its making ne type an answer that is 20 characyers long lol

Answer:

work = power × time

time = work ÷ power

Explanation:

Power is defined as the rate at which work is done.

 It is mathematically expressed as;

     Power  = \(\frac{work}{time}\)  

 From this expression, if we cross multiply, we get;

        work  = power x time

Also,   if we divide both sides by power, we get;

      time  = work ÷ power

Q=mcΔt

Q=14.6 x 10³ x 1.37 x (85-20)

Q=1.3 x 10⁶ J = 1.3 x 10³ kJ

Answer:β^+

Explanation: it is beta + , also positron emission radiation

Answer:

0 +1 e or β+

Explanation:

A P E X

Answer:

B

Explanation:

Answer:

B

Explanation:

A momentum does not stop it is conserved

C momentum is a vector quantity while energy is a scalar there is a difference

D momentum can't be formed a new it is still conserved

Answer:

76*

Explanation:

Answer:

Q= 31,798.4

Explanation:

You would use the specific heat formula which is Q=mCΔt

m(mass)=100

C(Specific heat capacity)= 4.184

Δt(change in temperature)=24-100=-76 or just 76 in this case

so Q=(100)(4.184)(76)=

418.4(76)=31,798.4

Therefore the missing value Q(heat lost or gained) equal 31,798.4

Hope that helped! xoxo

A micrometer is used to measure the diameter of a length of copper wire. The zero error and scale reading are as shown.The correct answer should be the micrometer.

The micrometer is an instrument that is capable of measuring the component of an object to very high precision. It is used to obtain accurate measurements in engineering.

In the case of the copper wire, the diameter of 0.3 mm was an approximation and a more accurate measure of the diameter would be obtained by using the micrometer.A micrometer is used to measure the diameter of a length of copper wire. The zero error and scale reading are as shown.The correct answer should be the micrometer.

Therefore, A micrometer is used to measure the diameter of a length of copper wire. The zero error and scale reading are as shown.The correct answer should be the micrometer.

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Answer:

Potential difference is the work done in moving a positive test charge from infinity to the point in question.

Voltage is an expression of PD.   (Joules / Coulomb)

Say that a capacitor has a PD of 5 Volts. The work in moving a positive test charge from the positive plate to the negative plate is -5 Joules/Coulomb or -5 volt. (At the positive plate the positive test charge (1 Coulomb) already has a PD of + 5 Volts.)

Astronomers can measure a star's mass in a binary star system where the star's orbital motion can be observed. By monitoring the motion of both stars in the binary system.

The gravitational interaction between them can be studied. Through careful analysis of their orbital parameters, such as the period and separation, astronomers can calculate the masses of the stars using Kepler's laws of motion and Newton's law of gravitation. By determining the mass of one star and observing the orbital dynamics, astronomers can infer the mass of the other star in the binary system. This method allows for the indirect measurement of a star's mass in a binary star system. By monitoring the motion of both stars in the binary system.

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Answer:

Camaflouge

Explanation:

When animals blend in with their surroundings to hide from predators.

Ex: A squirrel climbing a tree that is the same color of its fur.

An artic fox lying in the snow.

A bee getting pollen.

Stick bugs blending in with shrubs and trees.

Answer:

urjshsus uevus e survey dydvd dydvdyd d dgdv gdyr yrgdvv yth yrhvthr

Explanation:

ydgdydvd yd dv ydvr dyve dysdvdyr gdvr

Answer:

Sample Response: If temperature and surface area increase, then the time it takes for sodium bicarbonate to completely dissolve will decrease, because increasing both factors increases the rate of a chemical reaction.

Explanation:

The magnitude of the friction force on the 50 kg skier is 171.4 N.

To calculate the magnitude of the friction force, we can use the equation:

Friction force = coefficient of friction * normal force

First, let's find the normal force acting on the skier. The normal force is the force exerted by the surface perpendicular to the skier's weight. In this case, it is equal to the skier's weight, which is given by:

Weight = mass * gravity

Weight = 50 kg * 9.8 m/s^2 (acceleration due to gravity)

Weight = 490 N

Next, we can substitute the values into the friction force equation:

Friction force = 0.10 * 490 N

Friction force = 49 N

So, the magnitude of the friction force acting on the skier is 49 N.

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The intermolecular forces present in water include hydrogen bonding and dipole-dipole interactions.

Water is a polar molecule, meaning it has a positive and a negative end due to an uneven distribution of electron density. This polarity gives rise to intermolecular forces that hold water molecules together.

One of the intermolecular forces present in water is hydrogen bonding. Hydrogen bonding occurs when a hydrogen atom, which is covalently bonded to an electronegative atom (in this case, oxygen), is attracted to another electronegative atom (such as oxygen or nitrogen) in a different molecule. In water, the oxygen atom of one water molecule forms a hydrogen bond with a hydrogen atom of a neighboring water molecule. Hydrogen bonding is a strong intermolecular force and contributes to many of the unique properties of water, such as its high boiling point and surface tension.

In addition to hydrogen bonding, water also exhibits dipole-dipole interactions. Dipole-dipole interactions occur between the positive end of one polar molecule and the negative end of another polar molecule. In water, the positive hydrogen end of one water molecule is attracted to the negative oxygen end of a neighboring water molecule. These dipole-dipole interactions are weaker than hydrogen bonds but still contribute to the overall intermolecular forces present in water.

Other intermolecular forces, such as ion-dipole interactions and London dispersion forces, are not as significant in water compared to hydrogen bonding and dipole-dipole interactions. Ion-dipole interactions occur between an ion and the charged end of a polar molecule, while London dispersion forces arise from temporary fluctuations in electron distribution. While these forces may exist in other substances, they play a relatively minor role in the intermolecular forces of water.

In conclusion, the intermolecular forces present in water are primarily hydrogen bonding and dipole-dipole interactions. These forces contribute to the unique properties and behavior of water as a liquid.

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With a little additional arithmetic, we can determine that resistance of the filament at 100 watts is roughly 145 ohms using the formula R(Resistance)=E(Voltage)/I(Amps).

The bulb's power rating is 100 watt, and the rms voltage from across bulb is 220 volts, according to the query. So, to find the resistivity of the bulb, change P=100 watts with Vrms=220 watts in the formula P=V2rmsR. As a result, the bulb has a 484 ohm resistance.

The ratio of the electric current flowing through it to the voltage applied is the definition of electrical resistance for a component in the circuit or device: if there is consistent resistance over a broad range

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Solar energy and terrestrial reradiation are usually measured in units of length called micrometers.

Radiometers are sensors that can be used to measure solar and terrestrial radiation. These sensors detect electromagnetic radiation and convert it into a measurable electrical signal. The energy that the sensor detects can be measured in units of length called micrometers (µm).

One common type of radiometer is a pyranometer, which measures the total amount of incoming solar radiation. Another type of radiometer is a pyrgeometer, which measures the amount of outgoing longwave radiation from the Earth's surface. Both of these sensors measure radiation in units of micrometers.

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Given function isv(t) = t³ +13t²+47t-35and time interval is 1≤t≤7. We have to calculate:

(a) Displacement

(b) Total Distance

(a) Displacement:

Displacement is defined as the shortest distance between initial and final points. We can find the displacement of a particle with the help of following formula:

Displacement = Final Position - Initial PositionHere, the particle moves along a straight line, and we don't know the initial and final position.  Thus, the displacement of the particle is 219 ft.(b) Total Distance:Total distance traveled by the particle is the sum of all the distances covered by it in different intervals.

Thus, we have two real roots of the given equation:t₁

≈ - 6.548t₂

≈ 0.215

Therefore, ∫|v(t)|dt = 309

As we have to find the total distance, we have to add both the cases. Therefore,

Total Distance =∫|v(t)|dt  [from 1 to 7]

=∫|v(t)|dt [from 1 to 7]

=∫|v(t)|dt (from 1 to 1.215) +|v(t)|dt (from 1.215 to 7) = 252 + 309= 561 ft Thus, the total distance traveled by the particle is 561 feet.

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The given information says that the wind is blowing at 61 cvs. Therefore, the speed of the wind blowing is 61 cvs.

Wind speed is usually measured in miles per hour (mph), kilometers per hour (km/h), meters per second (m/s), or knots (nautical miles per hour, abbreviated kt or kts). To find the speed of the wind, these measurements use different mathematical formulas and conversion factors.It is stated in the given question that the wind speed is 61 cvs. However, this unit of wind speed is not commonly used, as it is not a standard unit of wind speed measurement.

The speed of the wind is an essential factor in predicting weather conditions and determining their potential impact on people, structures, and the environment. Wind speed is typically measured in units such as miles per hour (mph), kilometers per hour (km/h), meters per second (m/s), and knots. According to the given information, the wind speed is 61 cvs. This unit of wind speed is not widely used, as it is not a standard unit of wind speed measurement. To determine the wind speed, it is necessary to employ various mathematical formulas and conversion factors that differ depending on the unit of measurement used.

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