A car has a kinetic energy of 1.9 × 103 joules. If the velocity of the car is decreased by half, what is its kinetic energy?

Explanation:

The electromotive force acts when the magnetic field is applied to a current-carrying wire.

The electromotive force is given by the formula

Here, v is the velocity, q is the charge and theta is the angle between the magnetic field and direction of velocity.

The electromotive force will be maximum when the coil of wire is moving perpendicular to the magnetic field.

Thus, the correct option is a

Answer:

The gas law formula that should be used to solve the opportunity is;

Constant temperature, initial P·V = final P·V

Explanation:

From the question we have;

The initial volume of the cylinder, v₁ = 3.0 cc

The initial pressure of the gas in the cylinder, p₁ = 0.8 atm

The initial temperature of the gas in the cylinder, T₁ = Room temperature

The final volume of the cylinder, v₂ = 1.0 cc

The final pressure of the gas in the cylinder = p₂

The final temperature of the gas in the cylinder, T₂ = Room temperature

The gas law formula that should be used to solve the opportunity is Boyle's law which states that at constant pressure the pressure, of a given mass of gas is inversely proportional to the volume of the gas

Mathematically, Boyle's law can be expressed as follows;

P ∝ V

∴ P₁·V₁ = P₂·V₂

Which gives;

Constant temperature, initial P·V = final P·V

The total vapor pressure of the solution is (c) 99.3 mmHg.

A substance's or an object's temperature is a measurement of how hot or cold it is. It is a characteristic of matter that has to do with the typical kinetic energy of the atoms or molecules that make up the thing or material. Normally, temperatures are expressed in either degrees Celsius (°C) or degrees Fahrenheit (°F).

Raoult's law, because substance A's mole fraction is 0.35, it follows that substance B's mole fraction must be 0.65. (since the two mole fractions must add up to 1). The partial pressures of A and B in the solution can be determined using Raoult's law:

A's partial pressure is calculated as 0.35 x 87 mmHg, or 30.45 mmHg.

B's partial pressure is equal to 79.3 mmHg (0.65 x 122 mmHg).

The partial pressures of A and B are added to determine the solution's overall vapor pressure:

Total vapor pressure equals partial pressures of A and B, or 30.45 mmHg, 79.3 mmHg, and 109.75 mmHg respectively.

Rounding to the nearest tenth, we obtain 109.8 mmHg, which is the value that is most similar to option (c) 99.3 mmHg. Hence, the correct response is (c) 99.3 mmHg.

To know more about temperature, visit:

https://brainly.com/question/14532989

#SPJ1

Answer:

150

Explanation:

v = at

v = 10(15)

v = 150 m/s

Answer:

Lightning can be described by the flow of electric charges between the cloud and the ground.

Given,

The mass of the softball, m=0.49 kg

The speed with which the ball was thrown, u=-20 m/s

The speed of the ball after the batter hits it, v=25 m/s

The time duration for which the bat acts on the ball, t=0.012 s

Here we have considered the direction from the pitcher to the batter as the negative direction and the direction from batter to the pitcher as the positive direction.

The momentum of an object is given by the product of the mass of the object and its velocity.

The change in the momentum of the ball is given by,

On substituting the known values,

The change in the momentum is equal to the impulse that acts on an object due to the applied force. And the impulse is given by the product of the applied force and the time duration.

Thus,

Where I is the impulse and F is the magnitude of the average force exerted by the bat on the ball.

On substituting the known values,

Thus the magnitude of the average force exerted by the bat on the ball is 1837.5 N

Answer:

it contains nitrogen, potassium and phosphorus

Explanation:

the fertilisers contain nitrogen potassium and phosphorus . this makes the plants and algae grow faster.

Answer:

Explanation:

They traveled this distance in 2 parts, essentially. Part 1 had an average speed for a certain number of hours, part 2 had an average speed for a certain number of hours, and those 2 parts taken together took them a distance of 364 km. In equation form, that looks like this:

km/hr part 1 + km/hr part 2 = 364 km

Now we need to find each part on the left side of that equation. Part 1 first:

We traveled 65 km/hr for 2 hours, so that took us

\(65\frac{km}{hr}*2hr\) and canceling out the hour label, we have that in part 1 we got

65(2) = 130 km. Good. Now onto the second part, where our unknown is.

We traveled 78 km/hr the second part for x hours, so that took us

\(78\frac{km}{hr}*xhr\) and canceling out the hour label, we have that in part 2 we got

78x km. Now we can fill in the main equation (the one in bold print)

130 km + 78x km = 364 km and subtracting 130 km from both sides:

78x km = 234 km and dividing by 78 km:

x = 3 hours. Part 2 took 3 hours. Part 1 took 2 hours, so the whole trip took 5 hours.

Answer:

1 m/s  

Explanation:

2 to 3 second interval would be zero.

3 to 4 is 2 m/s

so average is 1 m/s

Answer:

a. No. The overall loudness is not proportional to the number of speakers.

b. No, it will not sound 4 times louder.

Explanation:

a. Loudness is the quality of how loud or soft the sound is. Since loudness is proportional to intensity and intensity proportional to the amplitude of the sound, the overall loudness of the sound would not be proportional to the number of speakers.

Since the sound from each speakers adds by superposition, their phases might be different but their amplitudes the same. So, the resultant wave from the four speakers has the same amplitude as the wave from one speaker. And, since loudness is proportional to amplitude, the loudness of the resultant wave is equal to the loudness of each individual speaker.

So, the loudness is not proportional to the number of speakers.

b. No, it will not sound 4 times louder.

This is because loudness is a function of amplitude.

Since the devices are identical and playing the same sound, their amplitudes are the same. They will thus add by superposition to generate a resultant wave which has an amplitude the same as each individual wave.

Since the amplitude of the resultant wave is the same and not an addition of each individual amplitude, the resultant wave does not sound 4 times louder.

Answer:

Latent heat

Latent heat is the heat needed to change a state without a change in temperature.

Explanation:

Hope this helps :D

Answer: 11.1cm

Explanation:

Object distance (u) = 32cm

Image distance(v) = 17cm

Focal length(f) =?

Lens formular:

1/f = 1/u + 1/v

1/f = 1/32 + 1/17

Taking the L. C. M of 17 and 32

1/f = (17 + 32) / 544

1/f = 49/544

Taking the reciprocal

f = 544/49

f = 11.1 cm

Therefore, Focal length of the lens is 11.1cm

Answer:

Height

Explanation:

the more height the more gravitational energy

Speed will it strike the positive plate 74.736*10^6 m/s

r = distance = 3.7 mm

a) E = electric field between plates =

E =  38*10^-6  / 8.85*10^-12

   = 4.293*10^6 N/C

from E = -dV / dr

dV = potential difference .  take magnitude:

dV = E*dr

   = 4.293*106*3.7*10-3

   = 15.887 *103V

b) from F ( force) = q*E

also F = ma

so                 ma = qE

a( acceleration) = qE/ m

q = charge on electron, m= mass

a  = 1.6*10^-19*4.293*10^6 / 9.1*10^-31

a = 7.548*1017 m/s2

u = initial velocity = 0 m/s ( at rest)

V = final velocity= ?,           S = distance = r = 3.7 mm

v^2 = u^2+2as

putting values we get

Speed will it strike the positive plate 74.736*10^6 m/s

To learn more about acceleration visit:https://brainly.com/question/12550364

#SPJ4

Answer:

Earthing

Explanation:

The relationship between linear acceleration (a) and angular acceleration from we get Diameter of the wheels is  0.71 m

Given :

linear acceleration a = 1.85 m/s²

angular acceleration \(\alpha\) = 5.23 rad/s²

radius r = a/  \(\alpha\) = 1.85/ 5.23 = 0.354 m

diameter  d = 2r = 2 * 0.354 = 0.71 m

diameter of the wheels is  0.71 m

To learn more about angular acceleration  refer,

https://brainly.com/question/21278452

#SPJ1

Answer:

option C is correct

Explanation:

given mass=5 kg  

velocity=20 m/s

momentum,P=m v

p=5*20=100 kg m/s

The momentum of the object is 100kg.m/s

HOW TO CALCULATE MOMENTUM:

Momentum (p) = mass (m) × velocity (v)

p = 20m/s × 5kg

p = 100 kg.m/s

Learn more: https://brainly.com/question/20644069?referrer=searchResults

Answer:

19.24 volts

Explanation:

From Ohm's law,

Applying,

V = IR.................. Equation 1

Where V = Voltage applied, I = currentflowing across the resistor, R = Resistance

From the question,

Given: I = 0.225 A, R = 85.5 Ohm

Substitute these values into equation 1

V = (0.225×85.5)

V = 19.24 volts

Hence the Voltage applied is 19.24 Volt

Answer:

19.24

Explanation:

acellus

1. The magnitude of the bicyclist's acceleration is 4.09 m/s²

2. The distance travelled by the bicyclist during the time is 39.6 m

1. How to determine the acceleration

We can obtain the acceleration of the bicyclist as illustrated below:

a = (v – u) / t

a = (18 – 0) / 4.40

a = 18 / 4.40

a = 4.09 m/s²

Thus, the acceleration of the bicyclist is 4.09 m/s²

2. How to determine the distance travelled

The distance travelled by the bicyclist can be obtained as       follow:        

v² = u² + 2as

18² = 0² + (2 × 4.09 × s)

324 = 0 + 8.18s

324 = 8.18s

Divide both side by 8.18

s = 324 / 8.18

s = 39.6 m

Learn more about acceleration:

https://brainly.com/question/491732

#SPJ1

Braking studies have shown that a tractor-trailer traveling at 55 mph needs two times the distance to stop as an automobile.

There are four parts that make up a vehicle's overall stopping distance i.e., Vehicle reaction time and distance, human perception time and distance, human reaction time and distance Vehicle Braking Distance and Time

The maximum distance your car will travel while braking under perfect circumstances. It may require 216 feet at 55 mph on dry pavement with decent brakes. The brakes must use more force to stop a bigger car, which increases heat absorption. On the other hand, large vehicles' brakes, tires, springs, and shock absorbers are made to function optimally when fully loaded. Trucks that are empty need longer stopping distances because they have less traction. It can lock up and bounce, providing substantially worse braking.

To learn more about braking system, click at:

https://brainly.com/question/28498761

#SPJ4

The lower solubility of Mg (OH)2 compared to Ca (OH)2 makes it difficult to determine the Ksp value in a similar experiment.

In the context of determining the Ksp value through titration, the solubility of a salt plays a crucial role. The Ksp value represents the equilibrium constant for the dissolution of a sparingly soluble salt in water. It is determined by measuring the concentration of the dissolved ions at equilibrium. In the given experiment, Ca(OH)2 was used, which has a higher solubility compared to Mg(OH)2. The solubility of a compound is the maximum amount of solute that can dissolve in a given solvent under specific conditions. Since the solubility of Mg(OH)2 is lower than that of Ca(OH)2, it means that fewer Mg2+ and OH- ions will be present in the solution for a given concentration. As a result, the equilibrium concentration of the ions in the solution will be significantly lower, making it challenging to accurately determine the Ksp value through titration. The lower solubility of Mg(OH)2 affects the endpoint of the titration. The endpoint is the point at which the indicator changes color, indicating the completion of the reaction. With Mg(OH)2, the endpoint may not be clearly observed due to the lower concentration of ions in the solution, leading to difficulties in accurately determining the Ksp value. Therefore, the lower solubility of Mg(OH)2 compared to Ca(OH)2 makes it challenging to decide the Ksp value in a similar experiment.

To learn more about equilibrium, click here; brainly.com/question/30807709

#SPJ11

Answer:

b

Explanation:

Answer:

B

Explanation:

Heating of gas leads to change in kinetic energy of the gas.

As the temperature of the system increases, the molecules in it begin to move faster, and the speed of the particles is directly proportional to the kinetic energy.

Kinetic energy is the energy possessed by the gaseous particles while they are in motion.

Mathematically, KE = (1/2)mv^2,

where KE is kinetic energy, m is mass, and v is velocity.

When the temperature of a gas increases but the pressure remains the same, the volume of the gas increases, which means that the molecules must cover more space in the same amount of time by moving faster.

To know more about kinetic energy,

https://brainly.com/question/4320273

#SPJ1

Answer:

19 and below because a whole number is just a number that isn't a fraction. They are basic counting numbers

Explanation:

Power sources that are connected in parallel should have the same voltage output. This statement is true.

What does it mean when we say two power sources are connected in parallel?  Power sources are connected in parallel to increase the current output. This means that the positive terminals of the power sources are connected to the other positive terminals, and the negative terminals of the power sources are connected to the other negative terminals. This results in the voltage output remaining the same, but the current output increasing. This is useful when more current is required for a particular application. To summarize, when power sources are connected in parallel, the voltage output should remain the same, and the current output should increase.

to know more about Power sources visit:

https://brainly.com/question/28582522

#SPJ11

The general (implicit) solution to Stefan's equation is given by:

ln((M^2 + T^2)/(M^2 - T^2)) = 2σt + 2C, where C is the constant of integration.

To solve Stefan's equation, we can separate the variables and integrate both sides. Let's proceed with the steps:

First, rewrite the equation as follows:

(1/(M^4 - T^4)) * dT/dt = σ

Now, we integrate both sides with respect to t:

∫(1/(M^4 - T^4)) * dT = ∫σ * dt

The left side of the equation requires integration by partial fractions. The integral can be expressed as:

1/(M^4 - T^4) = A/(M^2 + T^2) + B/(M^2 - T^2)

To determine the constants A and B, we can use the method of partial fractions. Multiply through by (M^4 - T^4) and then equate the numerators:

1 = A(M^2 - T^2) + B(M^2 + T^2)

Expanding and rearranging, we have:

1 = (A + B)M^2 + (A - B)T^2

Equating the coefficients of the powers of T, we get:

A + B = 0 (coefficient of T^2)

A - B = 1 (constant term)

Solving these equations simultaneously, we find A = 1/2 and B = -1/2.

Substituting the partial fraction decomposition back into the integral, we have:

∫(1/(M^4 - T^4)) * dT = ∫(1/2)*((1/(M^2 + T^2)) - (1/(M^2 - T^2))) * dT

Integrating both sides, we obtain:

(1/2) * (ln(M^2 + T^2) - ln(M^2 - T^2)) = σt + C

where C is the constant of integration.

Finally, solving for T, we can write the general (implicit) solution to Stefan's equation as:

ln((M^2 + T^2)/(M^2 - T^2)) = 2σt + 2C

To know more about  general (implicit)  refer here:

https://brainly.com/question/31426018#

#SPJ11

A uniform accelerated linear motion happens, when a ball is dropped from a certain amount of height.

After solving, we come to know that the water balloon that is dropped by the student 10 meters above the ground, will hit the ground after 1.0s of falling (in 1.4 s).

Which equation is used to describe motion over time for a ball falling from a certain height?

To find the time we need to use the equation that is related the time with the height and the acceleration due to gravity, that is to say, the first equation from the two given, but in the vertical direction:

yf=y0+v0t+1/2at² (1)

Where:

yf : is the final height = 0

yo: is the initial height = 10 m

vo: is the initial velociy = 0 (it is dropped)          

a: is the acceleration due to gravity = -9.8 m/s² (it is negative because its direction of motion is downward)

t: is the time =?  

Solving equation (1) for t, we have:

0=10m-1/2gt²

t=√2×10m/9.8m/s =1.4s

Therefore, the balloon will hit the ground after 1.0s of falling.

Main answer is :

We used the first given equation but in the y-direction, because the equation x=x₀+v₀t+(1/2)at², considers a motion in the horizontal direction, and the ball is falling (y-direction).

We did not use the other equation (v = v₀ + at) because we do not know the final velocity of the ball before it hits the ground (v).

To know more about uniform linear motion, click on https://brainly.com/question/118814

#SPJ1

First find the diameter of each.

Jupiter’s diameter is 86,881 mi.

Earth’s diameter is 7,917.5 mi.

Then divide those two.

Rounded, Jupiter is 11 times larger.

unrounded: 10.9732870224186927691821913482791285127

Finding out how large something is compared to something can be done by dividing.

For example I have two dogs. One dog is 3 feet tall. The other is 2 feet tall. How much taller is dog one? Dog one is 1.5 times larger because 3/2 = 1.5 AND 2 x 1.5 = 3.

So for this case multiplying Earth’s diameter by 10.9732870224186927691821913482791285127 will give you Jupiter’s diameter.

c) at the same speed as before. The waves will move down the string at the same speed as before, which is determined by the properties of the string.

If you are generating traveling waves on a stretched string by wiggling one end, and you suddenly begin to wiggle more rapidly without appreciably affecting the tension, you will cause the waves to move down the string at the same speed as before. Option c) At the same speed as before. Waves travel through the medium with a constant speed, which is determined by the properties of the medium and not by the amplitude of the wave.

When you wiggle the string, you generate a wave that travels down the string at a particular speed that is determined by the tension, mass, and length of the string. If you wiggle the string more rapidly, you generate a wave with a larger amplitude, but the speed of the wave remains the same. Therefore, the waves will move down the string at the same speed as before, which is determined by the properties of the string.

learn more about speed

https://brainly.com/question/28804440

#SPJ11

Answer: B

Explanation:

As gas bubbles accumulate, the upward pressure increases, forcing cracks in the rocks to widen, often in the direction of Earth's surface. For magma to erupt from a volcano, this upward pressure must exceed the downward pressure that is exerted by the eight-kilometer (five mile) thick load of rock overhead.