PHYSICS HIGH SCHOOL

If a force of 65 N is exerted on a 45 kg sofa and the sofa is moved 6.0 meters, how much work is done in moving the sofa? 17,550 J 171.990 J 390 J none of the above

Answers

Answer 1

Answer:

Answer:

The answer to your question is: W = 390 J

Explanation:

Work is the transfer of energy when a body is moved from one place to another.

Data

Force = 65 N

mass = 45 kg

distance = 6 meters

work = ? J

Formula

W = F x d

Process

W = 65 N x 6 m

W = 390 J

Answer 2

Answer:

Answer: 390 J

Explanation:

i got it right on my exam :D

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The horsepower (hp) that a shaft can safely transmit varies jointly with its speed, in revolutions per minute (rpm), and the cube of the diameter. If the shaft of a certain material 3 inches in diameter can transmit 46 hp at 100 rpm, what must the diameter be in order to transmit 74 hp at 175 rpm?

Answers

Answer:

diameter ≅ 3 inches

Explanation:

$HP=k*s*d^(3)$

Use a constant factor, k

Let Hp = horsepower

Let s = speed in rpm

Let d = diameter in inches

to find constant k, using

Hp=46

S=100

d=3 in

$46=k*100*3^(3) \n\n46=k*100*27\n46=2700k\nk=(46)/(2700) \nk=0.017\n\n$

To find diameter when;

Hp=74

S=175

k=0.017

d=d inches

$74=0.017*175*d^(3) \n\n74=2.975*d^3\nd^3=(74)/(2.975) \nd=\sqrt[3]{24.87} \nd=2.9 inches\n\n$ d≅ 3 inches

An object has a mass of 48g and a volume of 6cm cubed (like a little 3 above the m) Calculate the density of this object

Answers

   Density = (mass) / (volume)

    = (48 g) / (6 cm³)

      = (48 / 6) (g / cm³)

=    8 g/cm³

i hope this helps The density (d) of a material is its mass (m) divided by its volume (V). ... Calculatethe density of an object that has a mass of 25.0g and the volume is 10.5ml. ... 3.Calculate the mass for the following object. If you know that the object

When air is blown across the top of an openwater bottle, air molecules in the bottle vibrate
at a particular frequency and sound is produced.
This phenomenon is called
(1) diffraction (3) resonance
(2) refraction (4) the Doppler effect

Answers

When air is blown across the top of an open water bottle, air molecules in the bottle vibrate at a particular frequency and sound is produced in a process called "refraction".

Answer:

resonance

Explanation:

Resonance is when the frequency matches another objects natural frequency causing it to vibrate.

Matter behaving like a wave rather than like a particle is best illustrated by which phenomenon?

Answers

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Explain the relationship between motion and frame of reference.

Answers

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