PHYSICS HIGH SCHOOL

A kilowatt-hour is a unit of1. force
2. power
3. work
4. voltage
5. current
6. None of these
7. torque

(I tried 2 and 6, but they were both wrong :( )

Answers

Answer 1
Answer:

Answer:

option 4 is the correct answer
Answer 2
Answer: Option 4 would be the answer

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A current of 2.0A flows through a light bulb. What is the amount of charge flowing through the light bulb in 40 seconds?

Answers

Answer:

Quantity of charge = 80 Coulombs

Explanation:

Given the following data;

Current = 2 A

Time = 40 seconds

To find the amount of charge flowing through the light bulb;

Mathematically, the quantity of charge passing through a conductor is given by the formula;

Quantity of charge = current * time

Substituting into the formula, we have;

Quantity of charge = 2 * 40

Quantity of charge = 80 Coulombs

A physics student throws a ball thrown horizontally from the top of a building with a speed of 8 m/s. The student measures the height of the building to be 15m.

Answers

Answer:

Following are the solution to the given question:

Explanation:

Please find the complete question in the attached file.

a_x = 0\n\na_y = -g = -9.81\ \ (m)/(s^2) \n\nv_(iy) = 0 \n\ny = v_(iy) * t+ (1)/(2ay) * t^2 \n\n 15 = (1)/(2) * 9.8 * t^2 \n\nt = \sqrt{(2 * (15)/(9.8))} \n\n

  = 1.75 \ sec \n\n

Distance:

x = v_(ix) * t \n\n

  = 8 * 1.75\n\n= 14 m

Using the concept of motion, the answers to the question posed on the motion of a dropped ball are :

  • Verticalcomponentofacceleration=-9.8m/s²
  • Horizontalcomponentofacceleration=0
  • InitialverticalVelocity=0
  • Timetaken=1.75seconds
  • Landingdistancefrombuilding=14meters

The vertical component of acceleration is denoted as a_(y) :

The gravitational force acting on the ball in the downward direction has an acceleration of - 9.8 m/s². Hence,

  • V_(y) = 9.8 m/s^(2)

Gravitational force only acts downwards along the vertical, hence, horizontal component of acceleration will be Zero.

  • V_(y) = 0

then the vertical component of x, will be 0

  • V_(x) = 0

Theinitialverticalvelocity;V_(iy) is Zero :

  • V_(iy) = 0 :

Thetimetaken:

S = 0.5gt² ; S=distance=15meters;g=-9.81

15 = 0.5(9.8)t²

15 = 4.9t²

t² = (15 ÷ 4.9)

t² = 3.061

t = √3.061

t=1.75seconds

LandingDistancefrombuilding:

Horizontal speed × time taken

V_(ix) * 1.75

8 * 1.75 = 14 meters

Therefore, the ball landed 14 meters away from the building.

Learn more : brainly.com/question/13981527

What type of magnetism is present in a magnet that you use to place a photograph on the refrigerator? A. Induced
B. Superconducting
C. Contact
D. Permanent

Answers

Answer:

C) Contact

Explanation:

The magnet requires almost direct contact with the fridge to start its magnetic properties.

Answer:

Correct Answer is option D (permanent)

Explanation:

Permanent magnet

Permanent magnet is a magnet in which magnetic properties are present even in the absence of an external magnetic field. It has its own magnetic field.

Permanent type of magnetism is present in a magnet that we use to place a photograph on the refrigerator.This permanent magnet  is made up of powdered ferrite  and liquid plastic. The  mixture of ferrite and plastic is heated at a particular temperature and then this heated mixture is placed in a strong magnetic field. Due to this applied magnetic field this mixture is turned into a permanent magnet.

By this method of it requires less material to create a permanent magnet.

I hope this answer will help you.

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Answers

It would be the average I guess..300c temperature.Heat flows from higher temp. to lower temp. till the temp. of both the liquids are same.

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Answers

Pressure is the result of a force distributed over an area.

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b. relativistic speeds.
c. both A and B
d. none of the above

Answers

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