How much thermal energy is needed to boil 2.65 kg of water at its boiling
point?
Use Q = mass x latent heat of vaporization.
A. 265 kJ
B. 11.1 kJ
C. 5990 kJ
D. 882 kJ

Answer:

441 N

Explanation:

weight = mass x gravity

w = m x g.

We know that gravity = 9.8 m/s^2 and mass = 45 kg.

w = 45 kg x 9.8 m/s^2

w = 441 N

So the weight of the object is 441 N (newtons).

Answer:441 N.

Explanation:

The weight of 45 kg at rest on the surface of the Earth is about 45 * 9.8 N = 441 N.

Answer:

v = 7.74 m/s

Explanation:

Given that,

The acceleration of the object, a = 12 m/s²

The radius of the circle, r = 5 m

We need to find the velocity of the object. The centripetal acceleration act on the object that is given by :

[tex]a=\dfrac{v^2}{r}\\\\v=\sqrt{ar} \\\\v=\sqrt{12\times 5} \\\\v=7.74\ m/s[/tex]

So, the velocity of the car is 7.74 m/s.

Answer:

$42,560

Explanation:

Given that :

Charge per kwh = $0.08

Peak kvA = $10 /month

Total hours = 720 hours / month

Peak = 1000kVA

Power factor (PF) = 0.8

Averga power = 750k

Power consumption (Active) = PF* average Powe

Active consumption =. 0.8 * 750 = 600kW

Energy used = 600 * 720 = 432000 KW

Cost = 432000 *$0.08 = $34,560

Peak Energy = 0.8 * 1000 = 800 KW

Cost = $10 * 800 = $8000

Total = $(34,560 + 8000)

Total = $42,560

Answer:

P.E = 1764 Joules

Explanation:

Given the following data;

Mass = 6kg

Height = 30m

We know that acceleration due to gravity is equal to 9.8m/s²

To find the potential energy;

Potential energy can be defined as an energy possessed by an object or body due to its position.

Mathematically, potential energy is given by the formula;

[tex] P.E = mgh[/tex]

Where,

P.E represents potential energy measured in Joules.

m represents the mass of an object.

g represents acceleration due to gravity measured in meters per seconds square.

h represents the height measured in meters.

Substituting into the equation, we have;

P.E = 6 * 9.8 * 30

P.E = 1764 Joules

Answer: False

Explanation:

because according to universal law of gravitation, every object attracts every other object in the universe.

according to the newton's third law, for every action there is equal and opposite reaction.

So, both the saturn and pan exerts same force on each other

But from the newton's second law we have, F = ma   &   a = F/m

so, from the above equation acceleration produced by pan is high compared to the acceleration produced by saturn.

Therefore, acceleration produced by saturn is lower than the acceleration produced by pan

but force exerted by saturn is equal to the force exerted by pan

So, the answer is false

Hope it helped u,

pls mark as the brainliest

^_^

The statement is false. Saturn does not exert a much greater force on the moon Pan than Pan exerts on Saturn.

Newton's law of gravitation states that each particle having mass in the universe attracts each other particle with a force known as the gravitational force.

Gravitational force is proportional to the product of the masses of the two bodies and inversely proportional to the square of their distance.

According to Newton's third law, there is an equal and opposite response to every action. As a result, both Saturn and Pan exert the same force on one another.

But, according to Newton's second law,

F = ma

a = F/m.

As a result of the preceding equation, the acceleration generated by the pan is greater than that caused by Saturn. As a result, the acceleration generated by Saturn is less than that produced by Pan.

So that the power exerted by Saturn is equivalent to that of Pan.

Hence the statement is false.

To learn more about the gravitational force refer to the link;

https://brainly.com/question/24783651

Answer:

they are in imaginary world in this every thing is possible

Answer:

yes

Explanation:

earth has gravity force that is high than the moon gravity force which is 1/6 of earth gravity

Earth has gravity force that is high than the moon gravity force which is 1/6 of earth gravity.

A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.

The force on the moon is less than earth as gravity is 1/6 on the moon

When man jump than he will jump high on the moon than the earth.

Earth has gravity force that is high than the moon gravity force which is 1/6 of earth gravity.

To learn more about force refer to the link:

brainly.com/question/13191643

#SPJ2

Answer:

Explanation:

\frac{\lambda }{2} is the minimum interplanar spacing which is required for Bragg's diffraction to occur.

Frictional force is the force that causes an object to slow down when it touches another object. Thus, the correct option is C.

Frictional force of an object is the force which is generated by the two surfaces which generate due to their contact and slide against each other. A few factors which affect the frictional force are that these forces are mainly affected by the surface texture of the object and the amount of force impelling them together.

Frictional force is mainly of four types which include static friction, sliding friction, rolling friction, and the fluid friction. The frictional force can be given by the formula: F = μN, where μ is a constant.

Therefore, the correct option is C.

Learn more about Frictional force here:

https://brainly.com/question/30280752

#SPJ6

Answer:

Explanation:

Given parameters:

Electrical energy  = 18J

Quantity of charge Q = 12C

Unknown:

Voltage  = ?

Solution:

The expression of electrical potential energy is given as:

      Electrical potential energy  = [tex]\frac{1}{2}[/tex] c v²

c is the quantity of charge

v is the voltage

           18  =  [tex]\frac{1}{2}[/tex]  x 12 x v²  

           18 = 6v²  

              v² = 3  

               v = 1.7v

Answer:

Uhm thags hsed

Explanation:

Dkrr

The vertical forces add up to zero.

The net force on the object is 60N to the right.

F = m • a

60N right = (10kg) • (a)

a = (60N right) / (10kg)

a = 6 m/s^2 to the right

Multi-engine Commercial would be nice.

Answer:

b.. a difficulty of changing an object's motion, that's my ✨ g u e s s ✨

Answer:

the average speed of the car is 170 mph.

Explanation:

Given;

initial speed, u = 70 mph

time of motion, t₁ = 3 hours

final speed, v = 20 mph

time of motion, t₂ = 2 hours

The average speed of the car is calculated as;

[tex]v' = \frac{70(3) - 20(2)}{3-2} \\\\v' = 170 \ mph[/tex]

Therefore, the average speed of the car is 170 mph.

Answer:

Solids - Bricks , wood , Pottery, Bucket

Liquid - Water, soap, Sanitizers.

Gases - Aerosol in Deodorants, Chlorofluorocarbons in Fire extinguishers , Butane in lighters.

Answer:Light is made up of wavelengths of light, and each wavelength is a particular colour. The colour we see is a result of which wavelengths are reflected back to our eyes. The visible spectrum showing the wavelengths of each of the component colours. The spectrum ranges from dark red at 700 nm to violet at 400 nm.  

Explanation:

hope it helps

Answer:When light hits an object, the object reflects some of that light and absorbs the rest of it. Some objects reflect more of a certain wavelength of light than others. That's why you see a certain colour. For example, a lemon reflects mainly yellow light.

Explanation:

Answer:

1.0 volts

Explanation:

Given that:

The potential difference between the plate V = 10 V

C = 0.160 pF = 0.160 × 10⁻¹² F

The charge on the capacitor

Q = CV

Q = 0.160 × 10⁻¹² × 10

Q = 1.6 × 10⁻¹² C

It implies that the positive plate of capacitor has +1.6 × 10⁻¹² C charge while the negative plate has -1.6 × 10⁻¹² C

The number of excess electrons on the negative plate is:

[tex]n = \dfrac{q}{e}[/tex]

[tex]n = \dfrac{-1.6\times 10^{-12}}{-1.6\times 10^{-19}}[/tex]

[tex]n = 1.0 \times 10^7[/tex]

Thus, electron deficiency on the positive plate is [tex]1.0 \times 10^7[/tex]

The net negative charge that moves towards the positive plate is :

q = number of electrons moved × e

[tex]q = 1\times 10^6 \times (-1.6 \times 10^{-19})[/tex]

[tex]q = -1.6 \times 10^{-13} \ C[/tex]

Now, the net charge on the positive plate is:

[tex]q_{net} = q +q' \\ \\ q_{net} = (1.6 \times 10^{-12}) + (-1.6 \times 10^{-13})[/tex]

[tex]q_{net} =1.44 \times 10^{-12} \ C[/tex]

The potential difference between the plate;

[tex]V_{new} = \dfrac{q_{net} }{c}[/tex]

[tex]V_{new} = \dfrac{1.44 \times 10^{-12} }{0.16 \times 10^{-12}}[/tex]

[tex]V_{new} = 9.0 V[/tex]

The reduction in potential difference

[tex]\Delta V = V - V_{new}[/tex]

[tex]\Delta V = 10 - 9.0[/tex]

[tex]\mathbf{\Delta V = 1.0 \ volts}[/tex]

[tex]\frac{1}{2}[/tex]Answer:

    [tex]v_{exit } < v_{enter}[/tex]

Explanation:

To propose the solution of this problem we must use the relationship between work and energy

         W = ΔK

the change in kinetic energy is

         ΔK = K_f -K₀

         ΔK = ½ m v_f² - ½ m v₀² = ½ m (v_f² - v₀²)

in this case

         ΔK =  [tex]\frac{1}{2} m ( v_{exit}^2 - v_{enter}^2 )[/tex]

we can find work with the first law of thermodynamics

         [tex]\Delta E_{int}[/tex] = Q + W

where \Delta E_{int} is the internal energy of the body, usually measured in the form of an increase in the temperature of the system

          W = \Delta E_{int} - Q

if we consider that the internal energy does not change

         W = -Q

we substitute everything in the first equation

        -Q =   [tex]\frac{1}{2} m ( v_{exit}^2 - v_{enter}^2 )[/tex]

Because they are squared, the variables are positive, therefore, for the equation to be fulfilled, the exit velocity must be less than the entrance velocity.

            [tex]v_{exit } < v_{enter}[/tex]

Answer:

(a) The range of the projectile is 31,813.18 m

(b) The maximum height of the projectile is 4,591.84 m

(c) The speed with which the projectile hits the ground is 670.82 m/s.

Explanation:

Given;

initial speed of the projectile, u = 600 m/s

angle of projection, θ = 30⁰

acceleration due to gravity, g = 9.8 m/s²

(a) The range of the projectile in meters;

[tex]R = \frac{u^2sin \ 2\theta}{g} \\\\R = \frac{600^2 sin(2\times 30^0)}{9.8} \\\\R = \frac{600^2 sin (60^0)}{9.8} \\\\R = 31,813.18 \ m[/tex]

(b) The maximum height of the projectile in meters;

[tex]H = \frac{u^2 sin^2\theta}{2g} \\\\H = \frac{600^2 (sin \ 30)^2}{2\times 9.8} \\\\H = \frac{600^2 (0.5)^2}{19.6} \\\\H = 4,591.84 \ m[/tex]

(c) The speed with which the projectile hits the ground is;

[tex]v^2 = u^2 + 2gh\\\\v^2 = 600^2 + (2 \times 9.8)(4,591.84)\\\\v^2 = 360,000 + 90,000.064\\\\v = \sqrt{450,000.064} \\\\v = 670.82 \ m/s[/tex]

Answer:

When you stretch or compress a spring you work against the restoring force of the spring. This work is stored as elastic potential energy in the spring. The more you stretch or compress the spring, the more work is done by you and more energy is stored.

This is also evident from the expression of the potential energy ( U ) -

U=(1/2)kx2

Where x is the displacement from the unstretched position of the spring. Greater is the x. more is the energy stored.

Answer:

please find attached pdf

Explanation:

Answer:

tidal wave

Explanation:

Answer:

0.5

Explanation:

because it is V uwbsusvegwjosnfvehdbuxbdusndgdghqbwbwbbeuehdbdhdhdhdudhdhdudhdnskowoqllqlqlqnebe

Answer:

changing the direction in which a force is exerted

Answer:

Explanation:

The coordinate sketch for the system is shown in the attached file below. Also, in the cartesian coordinate system, since the height is less than the length and width, we did neglect the height. Thus, we eliminate the height and converted it to a two-dimension.

Answer:

150

Explanation:

Answer:

1.21 m/s

Explanation:

Given :

2 loudspeakers

F2 - F1 = 2.86 Hz

Speed of sound, V = 343

Fo = frequency when listener is at rest = 406Hz

To obtain the walking speed Vo, speed as observer moves away from speaker ;

Vo = [(F2 - F1) * V] ÷ 2 * Fo

Vo = [2.86 * 343] ÷ (2 * 406)

Vo = 980.98 / 812

Vo = 1.2081034

Vo = 1.21 m/s