A hair curling iron uses 13 watts of power. how long must it operate to do 1,040 joules of work?

Answers

Answer 1

Answer:
Knowing the solution to the 4-watt night light, you ought to be able to do this one on your own. But 5 points is 5 points, so here we go:

1 watt = 1 joule/second .

(1,040 joule) / (13 joule/second)

= (1,040 / 13) (second)

= 80 seconds .

Answer 2

Answer: Power of Watt = Energy in Joules / Time period in seconds

13 watts = 1040 joules / time in seconds
time in seconds = 1040 joules / 13 watts
time in seconds = 80 seconds

It must operate for 80 seconds to do 1,040 joules of work.

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How do I use the equation E=MC^2 in relation to atoms to find the amount of energy of a reaction?

Answers

-- Find the mass of all the pieces before the reaction.

-- Find the mass of all the pieces after the reaction.

-- Find the difference . . . (mass before) minus (mass after)

-- If any mass is missing, either you lost track of it, or else
it was converted to energy.

How much energy ?

(the missing mass) times c² .

Which describes what happens when a balloon is rubbed with a wool cloth?A.
Electrons move from the atoms in the balloon to the atoms in the cloth, causing the cloth to have a negative charge.

B.
Everyday objects do not have electric charges, so neither the balloon nor the cloth can gain or lose electrons.

C.
Electrons move from the atoms in the cloth to the atoms in the balloon, causing the balloon to have a negative charge.

D.
Electrons are shared equally between the atoms of the balloon and the atoms of the cloth, making both electrically neutral.

Answers

the correct answer would be a hope this helps :D

The answer is C. because when you rub the balloon on the wool the electrons move from the balloon to the wool.

Also when doing this you, can hear the static electricity which proves my point.

If you mix 40.0 ml of a 0.200 m solution of k2cro4 with an aqueous solution of agno3, what mass of solid forms? (hint: most chromates are insoluble.)

Answers

The mass of solid formed is 2.654 g

calculation

step 1: write the balanced molecular equation

=2AgNO3(aq) + k2CrO4(aq)→ Ag2CrO4(s) + 2 KNO3(aq)

step 2: calculate the moles of K2CrO4

moles = molarity x volume in liters

molarity = 0.200 M = 0.200 mol/L

volume = 40 .0 ml in liters = 40/1000 = 0.04 liters

moles is = 0.200 mol/l x0.04 L =0.008 moles

Step 3: use the mole ratio to determine the moles of solid formed( Ag2CrO4)

K2CrO4 :Ag2CrO4 is 1:1 therefore the moles of Ag2CrO4 is also

0.008 moles

step 4: calculate the mass of Ag2CrO4

mass = moles x molar mass

from periodic table the molar mass of Ag2Cro4

=(107.87 x2) + 52 +(16 x4) =331.74 g/mol

mass = 0.008 moles x 331.74 = 2.654 g

A 0.4-kg toy train car moving forward at 3 m/s collides with and sticks to a 0.8–kg toy car that is traveling in the opposite direction at –2 m/s. What is the size and direction of the final velocity of the two cars