1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Leno4ka [110]
1 year ago
14

A small box is held in place against a rough vertical wall by someone pushing on it with a force directed upward at 27 ∘ above t

he horizontal. The coefficients of static and kinetic friction between the box and wall are 0.40 and 0.30, respectively. The box slides down unless the applied force has magnitude 23 N .
Physics
1 answer:
Elena L [17]1 year ago
5 0

The box slides down the wall unless an external force of magnitude 23 N is applied on it. The object is directed upward with an angle of 27° above the horizontal surface. Therefore, the mass of block is 1.90 kg

<h3>What is friction?</h3>

A friction is a kind of force which resists the sliding or rolling of objects over the surface of each other.

Applied force, F = 23 N

Coefficient of static friction, μs = 0.40

Coefficient of kinetic friction, μs = 0.30

θ = 27°

Let 'N' be the normal reaction of the wall acting on the block and 'm' be the mass of block.

Resolve the components of force 'F'

As the block is in horizontal equilibrium with the wall.

So,

F Cos27° = N

N = 23 Cos27° = 20.495 N

As the block does not slide so it means that the static friction force acting on the block balances the downwards forces (gravity) acting on the block.

The force of static friction is:

μs x N = 0.4 x 20.495 = 8.19 N   .... (1)

The vertically downward force acting on the block is (mg - F Sin27°)

mg - 23 Sin 27° = mg - 10.441    ... (2)

Now by equating the forces from equation (1) and (2), we get

mg - 10.441 = 8.19

mg = 18.631

m x 9.8 = 18.631

m = 1.90 kg

Thus, the mass of block is 1.90 kg.  

Learn more about Friction here:

brainly.com/question/13000653

#SPJ1

Your question is incomplete, most probably the complete question is:

A small box is held in place against a rough vertical wall by someone pushing on it with a force directed upward at 27 ∘ above the horizontal. The coefficients of static and kinetic friction between the box and wall are 0.40 and 0.30, respectively. The box slides down unless the applied force has magnitude 23 N. What is the mass of the box in kilograms?

You might be interested in
A skydiver jumps from an airplane and falls freely for 5 seconds. If the sky diver's velocity increases by 49 m/s during that ti
Sergeeva-Olga [200]

Acceleration  =  (change in speed)  /  (time for the change)

                       =      (49 m/s)   /   (5 seconds)

                       =       (49 / 5)  m/s  /  s

                       =            9.8 m/s² 
8 0
2 years ago
Read 2 more answers
If the pitched ball was traveling 77 mph before stanton's bat hit it and 120 mph after his bat hit it, by what amount did the sp
Mice21 [21]

here we will use the concept of Newton's III law

as per Newton's III law the impulse given to the ball is same as the impulse lost by the bat

So here we will say

impulse gain by the ball = impulse lost by the bat

m_1(v_f - v_i) = m_2(\Delta v)

given that

m_1 = 5 ounce

m_2 = 32 ounce

For ball the change in speed will be

v_f - v_i = (120 - 77)mph

now from above equation

5\times (120 - 77) = 32 \times \Delta v

\Delta v = 6.72 mph

so speed of bat will decrease by 6.72 mph

3 0
2 years ago
A car stopped at a red light, not moving?
timofeeve [1]

I think it's a) 1st Newton's law... so sorry if it's wrong...

5 0
3 years ago
A baseball m=.34kg is spun vertically on a massless string of length l=.52m. the string can only support a tension of tmax=9.9n
larisa86 [58]
<span>4.5 m/s This is an exercise in centripetal force. The formula is F = mv^2/r where m = mass v = velocity r = radius Now to add a little extra twist to the fun, we're swinging in a vertical plane so gravity comes into effect. At the bottom of the swing, the force experienced is the F above plus the acceleration due to gravity, and at the top of the swing, the force experienced is the F above minus the acceleration due to gravity. I will assume you're capable of changing the velocity of the ball quickly so you don't break the string at the bottom of the loop. Let's determine the force we get from gravity. 0.34 kg * 9.8 m/s^2 = 3.332 kg m/s^2 = 3.332 N Since we're getting some help from gravity, the force that will break the string is 9.9 N + 3.332 N = 13.232 N Plug known values into formula. F = mv^2/r 13.232 kg m/s^2 = 0.34 kg V^2 / 0.52 m 6.88064 kg m^2/s^2 = 0.34 kg V^2 20.23717647 m^2/s^2 = V^2 4.498574938 m/s = V Rounding to 2 significant figures gives 4.5 m/s The actual obtainable velocity is likely to be much lower. You may handle 13.232 N at the top of the swing where gravity is helping to keep you from breaking the string, but at the bottom of the swing, you can only handle 6.568 N where gravity is working against you, making the string easier to break.</span>
7 0
3 years ago
Read 2 more answers
While traveling along a highway a driver slows from 24 m/s to 15 m/s in 12 seconds. What is the automobile’s acceleration?
Nimfa-mama [501]

Average Acceleration = (change in speed) / (time for the change)

Change in speed = (ending speed) - (starting speed)

                             =   15 m/s - 24 m/s  =  -9 m/s

Acceleration =  (-9 m/s) / (12 sec) =  - 0.75 m/s² .

6 0
3 years ago
Other questions:
  • At very close range, which of these forces is stronger than the gravitational force a.) electric only, b.) magnetic only c.) ele
    9·2 answers
  • A 1.5 kg tether ball is hit so that it circles the pole with an angular speed of 4m/s
    5·1 answer
  • Classical conditioning requires _____.
    14·2 answers
  • What will a spring scale read for the weight of a 58.0-kg woman in an elevator that moves (a) upward with constant speed 5.0 m/s
    12·2 answers
  • If two deuterium nuclei (charge +e, mass 3.34×10−27kg) get close enough together, the attraction of the strong nuclear force wil
    11·1 answer
  • Questions from chapter 8.rotational of a rigid body
    10·1 answer
  • A motorcycle has a magnet attached to the rim of its front wheel. The front tire has a diameter of 60 cm. A magnetic pickup is a
    15·1 answer
  • Cubes are three-dimensional square shapes that have equal sides. What is the density of a cube that has a mass of 12.6 g and a m
    8·1 answer
  • A liquid with a density of 900kg/m 3 is stored in a pressurized, closed storage tank. The tank is cylindrical with a 10m diamete
    11·1 answer
  • When you get to the snow, you grab a handful to take back to the beach. However, by the time you get there, the snow has disappe
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!