PHYSICS MIDDLE SCHOOL

5. A kettle has a power of 1200 W (Hint: 1200 W = 1200 J/S). If the kettletakes 2.5 minutes to boil water, how much energy had been transferred?

Answers

Answer 1

Answer:

Answer:

180,000 Joules

Explanation:

Hint: 1200 W = 1200 J/S

The kettle takes 2.5 minutes to boil water.

1 minute = 60 seconds

2.5 minutes = ?

Cross multiplying gives; 150 seconds

The energy transferred to boil the water in 150 seconds = 1200 J/S × 150 S = 180,000 J

Related Questions

Which organ system includes the esophagus, pancreas, and large intestine?A) Digestive B) ExcretoryC) IntegumentaryD) Lymphatic
Please help me with this. Finding speed.
What happens in a change in temperature as it is heated
1. What could be the energy of a flying aeroplane?2. Is work the same as power?
What determines the volume of a gas?o temperature and gravityo temperature and pressureonly pressureo only temperature

Please can you help me!!A group of pupils have a ray box, a mirror, a glass box and a prism. For each block, describe what happens when the ray is directed at it. Use as much scientific knowledge and understanding in your answers as you can. Focus on the processes of reflection , if this happens at all and refraction and dispersion.

Answers

In a mirror, the light ray undergoes reflection, in a glass block, the light ray undergoes refraction. For a prism, a light ray undergoes refraction and dispersion and in a glass box with a smooth surface, it may experience both reflection and refraction.

These processes of reflection, refraction, and dispersion may take place when the ray of light from the ray box is aimed at each of the objects:

Mirror: when a light beam strikes a mirror, it is reflected and reflects at an angle that is equal to the angle of incidence. According to the law of reflection, the angle of reflection and incidence are the same.

Glass Block: when a light beam penetrates a glass block at an angle, it changes direction as a result of the difference in light speed between the different media (glass and air). Refraction is the name given to this phenomenon. If the light in the glass slows down, the ray bends toward the normal, and if it speeds up, it bends away from the normal. The incidence angle and the glass's refractive index both affect how much bending occurs.

Prism: when a light beam enters a prism, it undergoes refraction as it transitions from air to the denser prism material. The rise in refractive index causes the ray to bend in the direction of the prism's base. Dispersion, or the separation of light into its individual colors (rainbow), is another effect of the prism. This occurs as a result of the various wavelengths of light diffracting differently as they pass through the prism. The stunning array of colors that occurs when light passes through a glass prism is caused by this phenomenon.

Hence, in a mirror, the light ray undergoes reflection, in a glass block the light ray undergoes refraction. For a prism, a light ray undergoes refraction and dispersion and in a glass box with a smooth surface, it may experience both reflection and refraction.

To learn more about Reflection, here:

brainly.com/question/9063836

#SPJ3

When it is shined at the mirror, it will simply reflect, and go in a straight line to the next point it will encounter.
When shined at the glass box, the laws of refraction and dispersion will work to create a displacement of the light once it hits the first wall, but then it will replace itself coming out via the second wall
for the prism, it will refract into all colors of the rainbow because of how the wavelengths separate.

A 75 kg baseball player runs at a velocity of 6 m/s before sliding to a stop at second base. a. What is the kinetic energy of the runner before he begins his slide? b. What is the kinetic energy of the runner once he reaches the base? c. What is the change in the kinetic energy of the runner? d. How much work is done by friction in stopping the runner? e. If the runner slides for 2 m, what is the force of friction that acts upon him?

Answers

Answer:

a. $\displaystyle k_o=1350\ J$

b. $\displaystyle k_1=0\ J$

c. $\Delta k=-1350\ J$

d. $W=-1350\ J$

e. $F=-675\ N$

Explanation:

Work and Kinetic Energy

When an object moves at a certain velocity v0 and changes it to v1, a change in its kinetic energy is achieved:

$\Delta k=k_1-k_0$

Knowing that

$\displaystyle k=(mv^2)/(2)$

We have

$\displaystyle \Delta k=(mv_1^2)/(2)-(mv_0^2)/(2)$

The work done by the force who caused the change of velocity (acceleration) is

$\displaystyle W=(mv_1^2)/(2)-(mv_0^2)/(2)$

If we know the distance x traveled by the object, the work can also be calculated by

$W=F.x$

Being F the force responsible for the change of velocity

The 75 kg baseball player has an initial velocity of 6 m/s, then he slides and stops

a. Before the slide, his initial kinetic energy is

$\displaystyle k_o=(mv_0^2)/(2)$

$\displaystyle k_o=((75)6^2)/(2)$

$\boxed{\displaystyle k_o=1350\ J}$

b. Once he reaches the base, the player is at rest, thus his final kinetic energy is

$\displaystyle k_1=((75)0^2)/(2)$

$\boxed{\displaystyle k_1=0\ J}$

c. The change of kinetic energy is

$\Delta k=k_1-k_0=0\ J-1350\ J$

$\boxed{\Delta k=-1350\ J}$

d. The work done by friction to stop the player is

$W=\Delta k=k_1-k_0$

$\boxed{W=-1350\ J}$

e. We compute the force of friction by using

$W=F.x$

and solving for x

$\displaystyle F=(W)/(x)$

$\displaystyle F=(-1350\ J)/(2\ m)$

$\boxed{F=-675\ N}$

The negative sign indicates the force is against movement

If an oxygen has 8 protons in its nucleus what is its atomic number A.6 B.8 C.4 D.12

Answers

The atomic number = the number of protons.

8 = atomic number

Answer is 8 !

~Sarah Robinsen

PLEASE HELP!!!!!!suppose that mA is 8.1 kg and mBis 6.5kg. The distance between their centers is 0.5o m.Calculate the force of attraction between these two bodies?

Answers

Somewhere in your book or your notes, you must have met the formula for the
gravitational attraction between two bodies. If you can go back and find it, you
only need to plug your numbers into that formula, and out will pop the answer.

Formula:    Force = G (mA x mB) / (distance)²

If everything is in SI units, then    G = 6.67 x10⁻¹¹ newton-meter² / kilogram²

You said that
   mA = 8.1 kg
   mB = 6.5 kg
   distance = 0.5 m .

   Force = (6.67 x 10⁻¹¹ nt-m²/kg²) (8.1kg x 6.5kg / (0.5m)² =

(6.67 x 10⁻¹¹ nt-m²/kg²) ( 52.65 kg² ) / (0.25 m²) =

   1.4047 x 10⁻⁸ newtons .

That's roughly 5.052 x 10⁻⁸ ounce . (5% of one micro-ounce)

What feature will form as a result of the movement displayed in this illustration?A.
transform boundary

B.
convergent boundary

C.
mid-ocean ridge

D.
deep-sea trench

Answers

a convergent boundary is correct

B.
convergent boundary

Which waves are longitudinal waves? Check all that apply.sound waves
ocean waves
ultraviolet waves
earthquake P-waves
earthquake S-waves
radio waves

Answers

Answer:

Sound waves and earthquake P-waves are longitudinal waves.

Explanation:

Longitudinal waves are waves in which the displacement through the medium is in the same direction of movement of the wave, independent of the direction.

There are included in the concept of longitudinal wave: sound waves (vibrations in pressure, particle displacement and velocity of particles propagated in an elastic medium) and earthquake waves of type P (created by earthquakes and explosions).

Sound waves.
Eathquake P-Waves

Other Questions

There are two ways to transfer energy, by particle transfer and by wave. Give an example of each.

How do igneous rocks differ from each other.

Dale and Alex push on opposite sides of a couch. Dale pushes to the left witha force of 100 N, while Alex pushes to the right with a force of 175 N. If thecouch has a mass of 55 kg, what is the acceleration of the couch?O A. 5 m/s2 rightO B. 5 m/s2 leftO c. 1.4 m/s? rightO D. 1.4 m/s2 leftSUBMIT

What two motions combine to produce an orbit