If the kinetic energy of a given mass is to be doubled, its speed must be multiplied by
1) 4
2) 2
3) 8
4) 2

Answer:

Salt water is more dense than freshwater

Explanation:

The only and best explanation for this phenomenon for this occurrence is that salt water is more dense than freshwater.

Answer: Insulator

Explanation:

An insulator is a material that restricts the flow of electricity or thermal energy.

Answer:

plastic or wood

Explanation:

Answer:

[tex]F_f=840N[/tex]

Explanation:

From the question we are told that

Weight of fireman [tex]W_f= 87.5kg[/tex]

Pole distance [tex]D=4.10m[/tex]

Final speed is [tex]V_f 1.75m/s[/tex]

Generally the equation for velocity is mathematically represented as

[tex]v^2 = v_0^2 + 2 a d[/tex]

Therefore Acceleration a

[tex]a'= v^2 / 2 d[/tex]

[tex]a'= 0.21m/s^2[/tex]

Generally the equation for Frictional force [tex]F_f[/tex] is mathematically given as

[tex]F_f=m*a[/tex]

[tex]F_f=m*(g-0.21)[/tex]

[tex]F_f=87.5*(9.81-0.21)[/tex]

Therefore

[tex]F_f=840N[/tex]

Answer:

56400Joules

Explanation:

The quantity of heat required is expressed as;

Q = mL

m is the mass = 25g = 0.025kg

L is the latent heat of vaporization for steam = 2.256×10^6J/kg

Substitute into the formula as shown;

Q = 0.025×2.256×10^6

Q = 56400Joules

Hence the quantity of hear required is 56400Joules

The amount of heat transfer from the steam is of 56400 J.

Given data:

The mass of steam is, m = 25.0 g = 0.025 kg.

The latent heat of vaporization of steam is, [tex]L = 2.256 \times 10^{6} \;\rm J/kg[/tex].

When heat is to be given to a unit mass of substance to converts it from a liquid phase to vapor phase. Then it is known as Latent heat of vaporization. The amount of heat is expressed as,

[tex]Q = m \times L[/tex]

Solving as,

[tex]Q = 0.025 \times (2.256 \times 10^{6})\\\\Q = 56400 \;\rm J[/tex]

Thus, we can conclude that the amount of heat transfer from the steam is of 56400 J.

Learn more about the Latent heat of vaporization here:

https://brainly.com/question/24203857

Answer:

19.6m/s

Explanation:

Given parameters:

Initial velocity  = 0m/s

Time  = 2s

Unknown:

Average velocity  = ?

Solution:

We can use the final velocity of the ball before landing to determines its average velocity ;

 Using;

              v  = u + gt

v is the final velocity

u is the initial velocity

g is the acceleration due to gravity

t is the time

              v  = 0 + 9.8 x 2 = 19.6m/s

Answer:

a) 2.94 N

b) 4.90 N

Explanation:

Let us assume that the weight of the ball is 0.98 N

Solution:

a) An object’s gravitational potential energy depends on two factors which are height and its weight (or mass). The equation for gravitational potential energy (PE) is given as:  

Potential energy = weight (w) * height (h)

PE = wh

Potential energy at 2 m shelf = weight * height = 0.98 N * 2 m = 1.96 N

Potential energy at 5 m shelf = weight * height = 0.98 N * 5 m = 4.90 N

The work needed to lift the ball from the 2-m shelf to the 5-m shelf = Potential energy at 5 m shelf - Potential energy at 2 m shelf

The work needed to lift the ball from the 2-m shelf to the 5-m shelf = 4.90 N - 1.96 N = 2.94 N

b) Potential energy at 5 m shelf = weight * height = 0.98 N * 5 m = 4.90 N

Answer:the wave model

Explanation:

Answer:

true lol its jist common sense

Answer: Seasonal migration is the movement of various species from one habitat to another during the year. Resource availability changes depending on seasonal fluctuations, which influence migration patterns. ... Many species, especially birds, migrate to warmer locations during the winter to escape poor environmental conditions.

Explanation:

Answer:

Length, gauge/size and composition

Explanation:

The longer the wire is the more resistance

The thinner the wire is more resistance

The difference in material effects the resistance ie. copper versus aluminium.

Answer:

14

Explanation:

21miles/3=7

7*2=14

Answer:

the powar produced is 0.7 watts

Answer:

Explanation:

Their most intimate experience probably happened during an unsuccessful peace mission in September 1776. The British forces had recently raced across Long Island (New York) and almost destroyed the American Army. The British commander, Adm. Lord Richard Howe, then offered peace. Congress sent Adams, Franklin, and Edward Rutledge (South Carolina) to meet Howe on Staten Island.

Howe hoped to resolve the differences between what Great Britain still considered its colonies and the mother country. The Americans insisted on British recognition of independence, but Howe had no such authority, and Adams and Franklin had little of their own. Although cordial, the meeting broke up without success after just three hours.

During the mission, Adams and Franklin lodged together at crowded inn in a small room with only one window. Adams records an unforgettable and amusing story in his diary about that evening and hearing Franklin’s theory of colds.

Answer:

[tex]E=101955.8volt/m[/tex]

The electric field direction is toward the right

Explanation:

From the question we are told that

Initial X-co-ordinate of proton [tex]X_1=20.0cm => \frac{20}{100}m[/tex]

Initial speed of Proton [tex]V_1= 3.5*10^6 m/s[/tex]

Final X-co-ordinate of proton [tex]X_2=80.0cm => \frac{80.0}{100}m[/tex]

Final speed of Proton [tex]V_2=0[/tex]

Generally the mass of Proton is given by

[tex]m_P=1.67*10^-27[/tex]

Generally the kinetic energy of the proton is mathematically given by

 [tex]K.E_p=1/2mv^2[/tex]

 [tex]K.E_p=1/2*1.6*10^-^2^7*(3.5*10^6)^2[/tex]

  [tex]K.E_p=9.8*10^-^1^5[/tex]

Generally the change in electric potential [tex]\triangle V[/tex] is mathematically given by

   [tex]\triangle V =\frac{K.E_p}{q}[/tex]

Charge on a proton [tex]q=1.602*10^-^1^9[/tex]

   [tex]\triangle V =\frac{9.8*10^-^1^5}{1.602*10^-^1^9}[/tex]

   [tex]\triangle V =61173.5volts[/tex]

Generally the equation for magnitude of an electric field is mathematically given by

  [tex]E=\frac{\triangle V}{\triangle d}[/tex]

Where

[tex]d=0.8m-0.2m\\d=0.6m[/tex]

Therefore

    [tex]E=\frac{61173.5}{0.8-0.2}[/tex]

    [tex]E=\frac{61173.5}{0.6}[/tex]

    [tex]E=101955.8volt/m[/tex]

The direction of the charge is towards the right

Answer:

833kg/m³

Explanation:

We have volume as Vm³

Density of this object = dKg/m³

Water density = 1000kg/m³

g = 10m/s²

We calculate FB which is the the buoyant force on object. Calculated as volume of object multiplied by water density

Fb = 1000Vg upwards

W = Vdg

Acceleration = net upwards/m

M = mass

2 = (1000g-gd)/d

2d = 10000 - 10d

2d + 10d = 10000

12d = 10000

d = 833.33kg/m³

Approximately 833kg/m³

The average density of the object is therefore 833kg/m³

Answer:

1) Adenine (A)   2. Uracil (U)   4) Cytosine (C)

Explanation:

"RNA consists of four nitrogenous bases: adenine, cytosine, uracil, and guanine."

Answer:

the angular speed in rad/s is 3.45

Explanation:

The computation of the angular speed in rad/s is as follows:

As we know that

1 rpm means 1 revolution per minute

Also 1 minute = 60 seconds

SO, for 33 rpm, the angular speed is

= 33 ÷ 60 × 2π

= 3.45  rad/s

As the revolution is of 360 degrees i.e. equivalent to 2π

Hence, the angular speed in rad/s is 3.45

Answer:

a = 40 [m/s²]

Explanation:

These kinds of problems can be solved using Newton's second law, which tells us that the sum of forces on a body is equal to the product of mass by acceleration.

∑F = m*a

where:

F = force = 6 [N]

m = mass = 0.15 [kg]

a = acceleration [m/s²]

[tex]a=F/m\\a=6/0.15\\a=40[m/s^{2} ][/tex]

Answer:

40 .............vxfhgcffffxxxhhxcjcxghxfgxsfg

Answer:

macule

Explanation:

its aa flat round areausually distingurished from its surroundung skin by its changed in color. smaller than 1cm  am small hemorrhage spot.

Given that,

Mass of a tribble, m = 2.5 kg

Radius, r = 1.4 m

The force on the tribble from the bucket does not exceed 10 times its weight.

To find,

The maximum tangential speed.

Solution,

The force acting on the tribble is equal to the centripetal force.

F = 10mg

The formula for the centripetal force is given by :

[tex]F=\dfrac{mv^2}{r}[/tex]

v is maximum tangential speed

[tex]v=\sqrt{\dfrac{Fr}{m}} \\\\v=\sqrt{\dfrac{mgr}{m}} \\\\v=\sqrt{{10gr}} \\\\v=\sqrt{10\times 9.8\times 1.4} \\\\v=11.7\ m/s[/tex]

So, the maximum tangential speed is 11.7 m/s.

Answer:

summer

Explanation:

Answer:

speed  v = 0.148 m / s

velocity   v = 0

Explanation:

In this exercise we must be careful that the speed is a scalar and the speed is a vector, let's start by looking for the speed

           v = Δx /Δt

the distance traveled is x = 2d and the time taken is

           t = 7h 30 min

let's reduce to seconds

          t = 7 h 3600s / 1h + 30 min 60s / 1min = 27000 s

so the speed is

          v = 2d / 27000

to finish the calculation suppose a distance traveled d = 2000 m

          v = 2 2000/27000

          v = 0.148 m / s

this is the raides which is the speed module

Velocity is a vector,

          v = Dx / Dt

in this case the displacement is

           Dx = d -d

           Dx = 0

the total displacement is zero since it returns to the starting point, consequently the velocity is zero

          v = 0

bold is a vector

Answer:

F = 1071.08 N

Explanation:

Given that,

The radius of the circular track, r = 3.23 m

Speed of the car, v = 3.72 m/s

The mass of the car, m = 250 kg

We need to find the net force acting on it. The centripetal force will act on it and it is given by the relation as follows :

[tex]F=\dfrac{mv^2}{r}\\\\F=\dfrac{250\times (3.72)^2}{3.23}\\\\F=1071.08\ N[/tex]

So, the net force acting on the car is 1071.08 N.

Answer:

hm

Explanation:

facil

Answer:

its true

Explanation:

i took it

Answer:

sorry I don't really know :P

Explanation:

Answer:

how many of those questions do you need answers to?

Explanation:

Answer:

PE = MGH.  1375 x 9.8 x 2. = 26950 joules

Explanation:

First do 1375 x 9.8 which is MG then times it by 2 which is H

Mass x Gravity x Height

the gravity will always be 9.8

I would love a brainliest

The the potential energy of the weights lifted 2 meters above the surface is E[P] = 26950 joules.

The energy of a body by virtue of its position is called potential energy. Mathematically -

E[P] = mgh

Given is an Olympian who lifted a 1,375-kilogram set of weights a vertical distance of 2 meters in the weightlifting event.

We can write the given data as follows -

Mass of weights = [M] = 1375 Kg

Displacement = [h] = 2 meters

Therefore, using the formula for potential energy, we can write -

E[P] = mgh

E[P] = 1375 x 9.8 x 2

E[P] = 26950 joules

Therefore, the the potential energy of the weights lifted 2 meters above the surface is E[P] = 26950 joules.

To solve more questions on Mechanical Energy, visit the link below-

https://brainly.com/question/20719292

#SPJ6

Answer:

Under assumption that all food energy that needs the horse is transformed into work, then the horse needs approximately 3 megajoules of food energy to work for 1 hour.

Explanation:

Since horse is working steadily, the power experimented by the horse ([tex]\dot W[/tex]), measured in watts, is at constant rate. Then, the work needed by the horse ([tex]W[/tex]), measured in joules, is equal to that power multiplied by time ([tex]\Delta t[/tex]), measured in seconds. That is:

[tex]W = \dot W\cdot \Delta t[/tex] (1)

If we know that [tex]\dot W = 750\,W[/tex] and [tex]\Delta t = 3600\,s[/tex], then the work needed for the horse is:

[tex]W = (750\,W)\cdot (3600\,s)[/tex]

[tex]W = 2.7\times 10^{6}\,J[/tex]

[tex]W = 2.7\,MJ[/tex]

Under assumption that all food energy that needs the horse is transformed into work, then the horse needs approximately 3 megajoules of food energy to work for 1 hour.

Answer:

The Potential Energy of the stretched spring is = 1.975 J

Explanation:

Recall that the potential energy of a spring of constant k stretched x\a distance x is given by the formula:

U = 1/2  k x^2

Therefore in our case, converting the stretch from cm of meters (0.05 m), this is

U = 1/2 * 79 * 0.05 J = 1.975 J

Answer:

A,B,D

Explanation:

cause ik