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Archy [21]
4 years ago
6

Which notations are commonly used on force diagrams to show forces acting on an object? Check all that apply. Fp Fz FN Ff FD Fg

Physics
2 answers:
8090 [49]4 years ago
8 0
Fp, Fn, Ff, Fg. The only reason I know is because I highlighted it in my notes.
Flura [38]4 years ago
6 0

Answer:

Fp, Ff, Fg, FN

Explanation:

Consider an object which is pushed along a horizontal surface. There are four forces acting on the object:

- The force of gravity (Fg), which is the force due to the attraction between the Earth and the object. It can be calculated as Fg = mg, where m is the mass of the object and g is the acceleration due to gravity, and it is directed downward.

- The normal reaction (FN), which is the force that the surface exerts on the object in order to counter-balance the force of gravity, and it is directed upward. It is equal in magnitude to the force of gravity.

- The force of push (Fp), which is the force applied when pushing the object and make it sliding along the surface. It is directed horizontally.

- The force of friction (Ff), which is the force that opposes to the motion of the object, and its direction is opposite to Fp. It is due to the contact between the molecules at the edge of the object and the molecules of the surface. Its magnitude is equal to F_f = \mu mg where \mu is the coefficient of friction, m is the mass of the object and g the acceleration due to gravity.


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A "590-W" electric heater is designed to operate from 120-V lines.
lukranit [14]

Answer:

a) 24.4 Ω

b) 4.92 A

c) 495.9 W

d)

c. It will be larger. The resistance will be smaller so the current drawn will increase, increasing the power.

Explanation:

b)

The formula for power is:

P = IV

where,

P = Power of heater = 590 W

V = Voltage it takes = 120 V

I = Current Drawn = ?

Therefore,

590 W = (I)(120 V)

I = 590 W/120 V

<u>I = 4.92 A</u>

<u></u>

a)

From Ohm's Law:

V = IR

R = V/I

Therefore,

R = 120 V/4.92 A

<u>R = 24.4 Ω</u>

<u></u>

c)

For constant resistance and 110 V the power becomes:

P = V²/R

Therefore,

P = (110 V)²/24.4 Ω

<u>P = 495.9 W</u>

<u></u>

d)

If the resistance decreases, it will increase the current according to Ohm's Law. As a result of increase in current the power shall increase according to formula (P = VI). Therefore, correct option is:

<u>c. It will be larger. The resistance will be smaller so the current drawn will increase, increasing the power.</u>

7 0
3 years ago
If two people lift identical stacks of books the same distance and one person does the job twice as fast, which of the following
Doss [256]

Answer:

Power

Explanation:

Power is defined as the rate of doing work with reference to the time spent and the formula is force multiplied by velocity.

In this case, if two people lift identical stacks of books the same distance and one person does the job twice as fast, then it means the velocity in the case is doubled which will also lead to an increase in the Power .

7 0
3 years ago
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Alik [6]

Answer:

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Explanation:

r =  \sqrt{{5}^{2} + 5^{2} - 2(5)(5) \cos(120) }

r =  \sqrt{25 + 25 - 50(0.8142)}

r =  \sqrt{50 - 40.71}  =  \sqrt{9.29}

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6 0
3 years ago
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vlabodo [156]
Infra-red has wavelengths just longer than visible light.

7 0
3 years ago
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The pacific ocean has a surface area of about
Aleks04 [339]

Answer:

150,000,000 km 2

Explanation:

5 0
4 years ago
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