What are the uses of Electricity in our every day life?

Answers

Answer 1

Answer: Calling
Heating Food
Going on the internet
Video Games
Weather
Heating up pools

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The diagram shows a person holding a bow and arrow. Which will most likely increase the kinetic energy in this system? a not releasing the string b increasing the mass of the arrow c releasing the string d pulling back less on the string

Answers

Answer:

releasing the string.

Explanation:

ed2020

Answer:

b. Increasing the mass of the arrow.

Explanation:

The formula is K=1/2mv^2. Increasing the mass also increases the kinetic energy.

What is the potential energy of a 1-kilogram ball is thrown into the air with an initial velocity of 30m/sec?

Answers

the ball thrown from height=0
potental energy(PE) =0
kinetic energy(KE) = 0.5mv^2 = 0.5(1)(30^2) = 450

at the highest point the ball does not moved, v=0
potential energy at its maximum
kinetic energy = 0

Energy is conserved then
total energy before = after
PE1 + KE1 = PE2 + KE2
0 + 450 = PE2 + 0

conservation of energy is fun fact

mass=1kg
g=10m/s^2 (assuming)
u=30m/s
height(h)=u^2/2g
=900/20=45m
P.E.=mgh
=1×10×45=450 joules

A train traveling 80.0 kph is blowing its horn as it approaches a railroad crossing. The horn has a frequency of 300.0 Hz. Assume the speed of sound is 331.5 m/s. What is the observed frequency of the horn?395 Hz

281 Hz

322 Hz

Answers

Answer:

322 Hz

Explanation:

v = speed of train approaching the railroad crossing = 80 km/h = 80 x 1000/3600 m/s = 22.22 m/s

V = speed of sound of the horn of train = 331.5 m/s

f = actual frequency of the sound from the horn = 300.0 Hz

f' = observed frequency of the horn

Using Doppler's effect, observed frequency is given as

f' = V f/(V - v)

inserting the values

f' = (331.5) (300.0)/(331.5 - 22.22)

f' = 322 Hz

the answer to your question is 322 hz
h

Explain how the atoms of the element helium are formed in a star

Please

Answers

When fusion happens in a star from the helium isotopes it has bi products helium which is only done during the first lot of fusion reactions

Which object carries the greatest amount of kinetic energy?

Answers

That Depends
The Object With Greater Mass Has Greater Amount Of Kinetic Energy

What is saving energy?

Answers

Not using electricity

not using as much and being efficient with how you use it!
hope this helps!

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As the particles in a soup reach the boiling point what do you expect to happen

The frequency of a purple photon is 7.14×10^14 Hz. Which equation should be used to solve for the wavelength of the photon?

A 1.00-L bulb and a 1.50-L bulb, connected by a stopcock, are filled, respectively, with argon at 0.75 atm and helium at 1.20 atm at the same temperature. Calculate the total pressure and the partial pressures of each gas after the stopcock has been opened and the mole fraction of each gas. Assume ideal-gas behavior.