I just need the equation on how to do it. I'm so lost :'( help please!!!!!!

Answers

Answer 1

Answer: The '120-V' is what we in the engineering profession call a "red herring".
You don't need it to solve the problem. The answer would be the same
if the blow drier were operating from a 440-V outlet, or any other kind
(just as long as the blow drier is designed to operate on whatever voltage
it was plugged into.)

Power = 750-W = 0.75 kW
Time = 13 minutes = 13/60 of an hour
Energy = (power) x (time) = (0.75 kW) x (13/60 of an hour) = 0.1625 kWh

Cost per unit of energy = $ 0.1 per kWh
Total cost = (energy) x (cost per unit of energy)

Total cost = (0.1625 kWh) x ($ 0.1 per kWh) = $ 0.01625 = 1.625 cents
===============================

The other answer has his significant figures correct, but shows what happens
when you don't carry your units all the way through.

Answer 2

Answer: $750W=0.75 kW\n \n 0.75*(13)/(60)=0.1625 \ kWh\n \n \boxed{0.1625*0.10=\$ \ 0.1625}$

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A force of 450 N accelerates a box across a frictionless surface at a rate of 15 m/s2. Find the mass of the box?A) 30 N B) 30 kg C) 6,750 N D) 6,750 kg
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The gas in a cylinder has a volume of 3 liters at a pressure of 100 kPa. The pressure of the gas is increased to 203 kPa. Assuming the temperature remains constant, what would the new volume be?

Answers

Boyle-Mariotte law,

P1*V1=P2*V2

Then,

100*3=203*V2

Then,

V2=1.48 L

Choose the best answer for each situation. A scientist with the EPA examining water for contamination writes down that there was an iridescent sheen on the surface of the water. What type of data did the scientist record?

Answers

The scientist has written down and example of qualitative data. Since he specifically wrote down that there was an iridescent sheen on the surface of the water, he is writing down the quality of water as seen by him. The type or condition cannot be expressed numerically, which makes it a qualitative type of data.

Why does the weight of water pulls the central part of the surface down?

Answers

Answer:

Buoyancy or Upthrust

Explanation:

This is an upward force exerted by a fluid that opposes the weight of a partially or fully immersed object.

Manuel releases a pendulum bob. The drawing shows its path. At which point does the pendulum bob have the most gravitational potential energy? a. no differences
b. point D
c. point B
d. point C

Answers

The right answer for the question that is being asked and shown above is that: "c. point B." Manuel releases a pendulum bob. The drawing shows its path. At point B that the pendulum bob have the most gravitational potential energy.

What is the kinetic energy of an object that has a mass of 30kg and moves with a velocity of 20 m/s?A. 6,000J
B. 12,000J
C. 5,880J
D. 2,940J

Answers

a) 6000J

the formula will fit in, once you know the formula you are good to answer.
k.e.=1/2 mv^2

What is the temperature 32 degrees Fahrenheit in degrees Celsius?a. 20 degrees Celsius
b. 0 degrees Celsius
c. 10 degrees Celsius
d. 10 degrees Celsius

Answers

Using    (F - 32)/9 = C/5
Where F is Fahrenheit, C = Celsius.

Let F = 32, (32 - 32)/9 = C/5
   0/9 = C/5
      0 = C/5, therefore C = 0*5 = 0

32°F = 0°C

Answer:so that means the answer 32°F = 0°C

Explanation:

Using (F - 32)/9 = C/5

Where F is Fahrenheit, C = Celsius.

Let F = 32, (32 - 32)/9 = C/5

0/9 = C/5

0 = C/5, therefore C = 0*5 = 0

32°F = 0°C