A warehouse worker is pushing a 90.0 kg crate with a horizontal force of 292 N at a speed of v = 0.875 m/s across the warehouse floor. He encounters a rough horizontal section of the floor that is 0.75 m long and where the coefficient of kinetic friction between the crate and floor is 0.359.
(a)
Determine the magnitude and direction of the net force acting on the crate while it is pushed over the rough section of the floor.
magnitude N direction
(b)
Determine the net work done on the crate while it is pushed over the rough section of the floor.
J
(c)
Find the speed of the crate when it reaches the end of the rough surface.
m/s
SOLUTION :
a.
N = mg = 90*9.8 = 882 (N)
F = µk * N = 0.359*882 = 316.64 (N)
Net Push force on the crate = P - F = 292 - 316.64 = - 24.64 (N)
So,
Magnitude = 24.64 (N) and direction : opposite to motion.
(ANSWER)
b.
WD = | P net * d | = | - 24.64*0.75 | = 18.48 J (ANSWER).
c.
Let v’ m/s be the speed at the end of rough surface
So,
Change of K. E. = WD
=> 1/2 m (v’^2 - v^2) = - 18.48
=> 1/2 * 90 (v’^2 - 0.875^2) = - 18.48
=> v’^2 = - 18.48/45 + 0.875^2 = 0.355
=> v’ = sqrt(0.355) = 0.596 m/s (ANSWER)
A warehouse worker is pushing a 90.0 kg crate with a horizontal force of 292 N...
A warehouse worker is pushing a 90.0 kg crate with a horizontal force of 276 N at a speed of v = 0.865 m/s across the warehouse floor. He encounters section of the floor that is 0.75 m long and where the coefficient of kinetic friction between the crate and floor is 0.357. (a) Determine the magnitude and direction of the net force acting on the crate while it is pushed over the rough section of the floor. (b) Determine the net...
A warehouse worker is pushing a 90.0 kg crate with a horizontal force of 284 N at a speed of v=0.850 m/s across the warehouse floor. He encounters a rough horizontal section of the floor that is 0.75 m long and where the coefficient of kinetic friction between the crate and floor is 0.351. (a) Determine the magnitude and direction of the net force acting on the crate while it is pushed over the rough section of the floor magnitude...
A warehouse worker is pushing a 90.0 kg crate with a horizontal force of 288 N at a speed of v = 0.850 m/s across the warehouse floor. He encounters a rough horizontal section of the floor that is 0.75 m long and where the coefficient of kinetic friction between the crate and floor is 0.357. (a) Determine the magnitude and direction of the net force acting on the crate while it is pushed over the rough section of the...
for both questions A 0.36 kg object travels from point A to point B. If the speed of the object at point A is 7.0 m/s and the kinetic energy at point B is 8.0 J, determine the following (a) the kinetic energy (in )) of the object at point A (b) the speed (in m/s) of the object at point B m/s 17. (-/4 Points] DETAILS SERCPWA11 5.WA.019. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A warehouse worker is...
A man pushing a crate of mass m = 92.0 kg at a speed of v = 0.845 m/s encounters a rough horizontal surface of length ℓ = 0.65 m as in the figure below. If the coefficient of kinetic friction between the crate and rough surface is 0.357 and he exerts a constant horizontal force of 292 N on the crate. A man pushes a crate labeled m, which moves with a velocity vector v to the right, on...
A man pushing a crate of mass m = 92.0 kg at a speed of v = 0.880 m/s encounters a rough horizontal surface of length ℓ = 0.65 m as in the figure below. If the coefficient of kinetic friction between the crate and rough surface is 0.350 and he exerts a constant horizontal force of 287 N on the crate. (a) Find the magnitude and direction of the net force on the crate while it is on the rough...
A man pushing a crate of mass m= 920kg at a speed of V = 0.865 me encounters a rough horizontal surface of length 6–065m as in the figure below. If the coefficient of kinetic friction between the crate and rough surface is 0.353 and he exerts a constant horizontal force of 284 N on the crate. (a) Find the magnitude and direction of the net force on the crate while it is on the rough surface. magnitude direction --Select--...
A man pushing a crate of mass m = 92.0 kg at a speed of v = 0.860 m/s encounters a rough horizontal surface of length = 0.65 m as in the figure below. If the coefficient of kinetic friction between the crate and rough surface is 0.355 and he exerts a constant horizontal force of 300 N on the crate, find the following. Find the magnitude and direction of the net force on the crate while it is on...
A man pushing a crate of mass m= 92.0 kg at a speed of v=0.880m/s encounters a rough horizontal surface of length l= 0.65 m as in the figure below. If the coefficient of kinetic friction between the crate and rough surface is 0.356 and he exerts a constant horizontal force of 293N on the crate, find the following.(a) Find the magnitude and direction of the net force on the crate while it is on the rough surface.magnitudeNdirection---Select---updownin the same direction as...
Just asking help with Part I A factory worker pushes a 30.0 kg crate a distance of 4.40 m along a level floor by pushing downward at an angle of 28.0° below the horizontal. The coefficient of kinetic friction between the crate and floor is 0.260. The Crate is Pushed with Increasing Speed Now assume that, instead of the previous situation, the worker pushes harder (without changing the direction of his push), so that the crate moves with increasing speed....