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tino4ka555 [31]
3 years ago
15

A 45-kg box containing a new bicycle has just arrived in the front porch and two brothers are fighting over it. The first brothe

r pulls with a five of 52 N, while the second brother pulls on the opposite direction with a force of 125 N. What is the minimum coefficient of static friction that will prevent the box from moving?
Physics
1 answer:
Hitman42 [59]3 years ago
7 0

Answer:

0.17

Explanation:

Draw a free body diagram.  There are five forces on the box:

Weight force mg pulling down

Normal force Fn pushing up

Applied force 52 N pulling to the left

Applied force 125 N pulling to the right

Friction force Fnμ pulling to the left

Sum of the forces in the y direction:

∑F = ma

Fn − mg = 0

Fn = mg

Fn = (45)(9.8)

Fn = 441

Sum of the forces in the x direction:

∑F = ma

125 − 52 − Fnμ = 0

Fnμ = 73

μ = 73 / Fn

μ = 73 / 441

μ = 0.17

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PLEASE HELP!!!
lilavasa [31]

Answer:

ω = 3.1 rad/s

θ = 36° from vertical

Explanation:

I will ASSUME that the bob and string is acting as a pendulum.

Please understand that the string will break when the bob is at the lowest point of the swing where the vectors of gravity and centripetal acceleration align. It will NOT break at the angle of maximum inclination measured from vertical. This angle is only a component of the maximum potential energy that gets converted to maximum kinetic energy at the lowest point of the swing.

At the bottom of the swing, the string must support the weight of the bob plus supply the required centripetal acceleration.

F = mg + mω²R

F/m = g + ω²R

F/m - g = ω²R

ω = √((F/m - g)/R)

ω = √((3/0.220 - 9.8)/0.40)

ω = 3.09691...

ω = 3.1 rad/s

Potential energy will convert to kinetic energy

       mgh = ½mv²

             h = v²/2g

R - Rcosθ = v²/2g

R(1 - cosθ) = v²/2g

   1 - cosθ = v²/2gR

        cosθ = 1 - v²/2gR

        cosθ = 1 - (Rω)²/2gR

        cosθ = 1 - Rω²/2g

        cosθ = 1 - 0.40(3.1²)/(2(9.8))

        cosθ = 0.804267

              θ = 36.46045...

              θ = 36°

7 0
2 years ago
4. How many neutrons are there in an atom of protium? Deuterium? Tritium? <br> P
insens350 [35]
The main difference between protium, deuterium, and tritium is that protium has no neutrons in its nuclei, whereas deuterium is composed of one neutron and tritium is composed of two neutrons [17]. Protium is an isotope of hydrogen that is composed of one proton and one electron.
6 0
2 years ago
A rocket weighs 9800 n what is its mass
rusak2 [61]

Answer:

the mass of 1000 kg

Explanation:

Hope this helps :) mark me as brainliest pls

8 0
3 years ago
Read 2 more answers
Den pushes a desk 400 cm across the floor he exerts a force of 10 no for 8 so to move the desk what is the power in put
Licemer1 [7]
You have to convert 400 cm into meters.
I'm assuming you mean a force of 10 Newtons in 8 seconds.
P= w/t
w=Fd
w= 10 x 4 = 40
P= 40 / 8 = 5
5 is your answer.
3 0
2 years ago
Force of 99N and 64N act on an object of mass27 kg. what is the acceleration of the object
zimovet [89]
That all depends on the angle between the two forces.

It could be anything between 1.3 m/s² in the direction of the larger force, if
they're in opposite directions, all the way around to 6.04 m/s² in the direction
of both of them if they're both in the same direction.

That includes magnitudes between 1.3n and 6.04n directed somewhere between
the two forces if they're in different, unrelated directions.


8 0
3 years ago
Read 2 more answers
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