All categories

3 years ago

Please help! will give brainlest!!!!!!!!!!!!

Physics

1 answer:

eimsori [14]3 years ago

7 0

The force of friction is 19.1 N

Explanation:

According to Newton's second law, the net force acting on the bag is equal to the product between its mass and its acceleration:

$\sum F = ma$

where

$\sum F$ is the net force

m is the mass

a is the acceleration

The bag is moving at constant speed, so its acceleration is zero:

$a=0$

Therefore the net force is zero as well:

$\sum F = 0$

Here we are interested only in the forces acting along the horizontal direction, therefore the net force is given by:

$\sum F = F cos \theta - F_f = 0$

where

$F cos \theta$ is the horizontal component of the applied force, with

F = 22.5 N

$\theta=32.0^{\circ}$

$F_f$ is the force of friction

And solving for $F_f$ , we find

$F_f =Fcos \theta=(22.5)(cos 32.0^{\circ})=19.1 N$

Learn more about friction:

brainly.com/question/6217246

brainly.com/question/5884009

brainly.com/question/3017271

brainly.com/question/2235246

#LearnwithBrainly

You might be interested in

If the x-position of a particle is measured with an uncertainty of 1.00×10-10 m, then what is the uncertainty of the momentum in

yawa3891 [41]

Answer:

The uncertainty in momentum is 5.25x 10^25Jsm

Explanation:

We know that

h bar = h/2π

1.05x 10^34=h/2pπ

h=1.05x 10^ 34(2π)=6.597x 10^-34Js

dp=(6.597x10^-34/4pπ)/(1x10^-10)

=5.25x10^-25 Jsm

4 0

3 years ago

A piano wire with mass 3.00 g and length 80.0 cm is stretched with a tension of 25.0 N. A wave with frequency 120.0 Hz and ampli

lys-0071 [83]

Answer:

(a) $P_{avg}$ = 0.22 W

(b) $P_{avg,2}$ = 0.056 W

Explanation:

given information:

the mass of piano wire, m = 3.00 g = 0.003 kg

tension, F = 25 N

length, l = 80 cm = 0.8 m

frequency, f = 120 Hz

amplitude, A = 1.6 mm = 0.0016 m

(a) the average power carried by the wave, $P_{avg}$

$P_{avg}$ = $\frac{1}{2}$ (√μF)ω²A²

where,

ω = 2πf = 2π120 = 754 $s^{-1}$

μ = $\frac{m}{l}$

= $\frac{0.003}{0.8}$

= 0.00375 kg/m

thus,

$P_{avg}$ = $\frac{1}{2}$ (√(0.00375)(25))(754)²(0.0016)²

$P_{avg}$ = 0.22 W

(b) What happens to the average power if the wave amplitude is halved.

based on the equation above, we know that the average power is proportional to the square amplitude. therefore

$\frac{P_{avg,1} }{P_{avg,2} } = \frac{A_{1} ^{2} }{A_{2} ^{2} } }$

$\frac{P_{avg,1} }{P_{avg,2} } = \frac{A_{1} ^{2} }{(0.5A_{1} )^{2} } }$

$P_{avg,2}$ = $\frac{0.22}{4}$

$P_{avg,2}$ = 0.056 W

4 0

3 years ago

A ball is thrown from a top of a building of height 20m. If the initial velocity of the ball is 15m/s at 370 above the horizonta

Lesechka [4]

Explanation:

Givens:

$h = 20 \: m$

$v _{ix} = 15 \cos(37) = 11.97$

$v _{iy} = 15 \sin(37) = 9.03$

$a _{y} = - 9.8$

Let t=2 be the final velocity. Since Velocity stays the same horizontal , acceleration due to gravity changes the vertical direction

Use this equation

$v _{y} = v _{iy} + a _{y}(t)$

Plug in the knowns

$v _{y} = 15 \sin(37) +2 ( - 9.8)$

$v _{y} = - 10.57$

So the velocity in the y direction at 2 seconds is -10.57

The velocity in the x direction at 2 seconds is 11.97

Use the Pythagorean theorem to find the total velocity

$v = \sqrt{( - 10.57) {}^{2} + (11.97) {}^{2} }$

$v = 15.97$

b. The range at which it strike the ground.

We need to find when the velocity at the top is zero.

Using the y direction,

$0 = v \sin( 37 ) - 9.8(t)$

$t = 0.921$

Next, find the height of the max.

$h = \frac{1}{2} ( 9.8)(0.921) {}^{2} = 4.16$

So the total distance is 4.16+20= 24.16

Next to find the total time it falls

$24.16 = \frac{1}{2} (9.8) {t}^{2}$

$t = 2.2$

So our total flight time is

$3.141$

Range is

$v \cos(37) (3.141) = 37.63$

6 0

2 years ago

good morning to you all! someone please answer this, ill give you brainliest and you will earn 50 points.

Shalnov [3]

Natural hazards do not have to be natural disasters. What are some of the ways modern technology can help prevent future natural disasters?

Satellite imaging to make future disaster prediction
Monitoring seismic activity using seismographs

Satellite imaging helps in predicting disasters like hurricane. Before hurricane, the satellite can help detect the movements in ocean.

Seismographs are the devices that respond to the ground shaking before volcanic eruption, earthquake and explosions.

3 0

2 years ago

Read 2 more answers

How much space something takes up is called?

Nikolay [14]

Mass is the area an object takes up. Like a box on the floor that box has a mass for it is taking up an area

6 0

3 years ago