Question

A person pushes a 15.0 kg lawn mower at constant speed with a force of 89.0 N directed along the handle, which is at an angle of 45.0∘ to the horizontal.

a. Calculate the horizontal friction force on the mower.

Express your answer to three significant figures and include the appropriate units.

b. Calculate the normal force exerted vertically upward on the mower by the ground.

Express your answer to three significant figures and include the appropriate units.

c. What force must the person exert on the lawn mower to accelerate it from rest to 1.3 m/s

in 2.5 seconds, assuming the same friction force?

Express your answer to three significant figures and include the appropriate units.

Answer #1

A person pushes a 400.0 kg couch 10.5 m up a 15.0 ̊ incline at a
constant velocity. The person pushes the couch against friction,
which has a kinetic friction coefficient of 0.40. A. What
is the is the force exerted by the person? B. What is the work done
on the couch by the person? C. What is the work done on the couch
by the force of gravity? D. What is the work done on the couch by...

A 100 kg person pushes a box up a ramp at constant speed. The
mass of the box is 30 kg, the coefficient of kinetic friction
between the box and the ramp is 0.2, and the ramp is inclined 25
degrees above the horizontal. The person (new at pushing boxes up
ramps) pushes purely in the horizontal direction. HINT: you must
draw complete FBDs to receive full credit.
a) Find an expression for the magnitude of the normal force on...

The 72.5-kg climber in (Figure 1) is supported in the “chimney”
by the friction forces exerted on his shoes and back. The static
coefficients of friction between his shoes and the wall, and
between his back and the wall, are 0.82 and 0.67, respectively.
Assume the walls are vertical and that the static friction forces
are both at their maximum. Ignore his grip on the rope.
Determine the minimum normal force he must exert.
Express your answer to two significant...

A 280-kg load is lifted 24.0 m vertically with an acceleration
a=0.110 g by a single cable.
A.
Determine the tension in the cable.
Express your answer to three significant figures and include the
appropriate units.
B.
Determine the net work done on the load.
Express your answer to three significant figures and include the
appropriate units.
C.
Determine the work done by the cable on the load.
Express your answer to three significant figures and include the
appropriate units....

Four 7.5-kgkg spheres are located at the corners of a square of
side 0.55 mm.
Calculate the magnitude of the gravitational force exerted on
one sphere by the other three.
Express your answer to two significant figures and include the
appropriate units.
F= ????? N
Calculate the direction of the gravitational force exerted on
one sphere by the other three.
Express your answer to two significant figures and include the
appropriate units.
θ= ????

Part A
Calculate the buoyant force of air (density 1.20 kg/m3 ) on a
spherical party balloon that has a radius of 14.6 cm .
Express your answer to three significant figures and include
appropriate units
Part B
If the rubber of the balloon itself has a mass of 2.00 g and the
balloon is filled with helium (density 0.166 kg/m3 ), calculate the
net upward force (the “lift”) that acts on it in air.
Express your answer to three...

The force on a wire is a maximum of 8.50×10−2 N when
placed between the pole faces of a magnet. The current flows
horizontally to the right and the magnetic field is vertical. The
wire is observed to "jump" toward the observer when the current is
turned on.
a.)
What type of magnetic pole is the top pole face?
What type of magnetic pole is the top pole face?
South pole
North pole
b.)
If the pole faces have a...

A satellite of mass 5570 kg orbits the Earth and has a period of
6600 s .
determine the radius of its circular orbit.
Express your answer using three significant figures and include
the appropriate units.
r =
Determine the magnitude of the Earth's gravitational force on
the satellite.
Express your answer using three significant figures and include
the appropriate units.
Fgrav =
Determine the altitude of the satellite.
Express your answer using three significant figures and include
the appropriate...

A satellite of mass 5450 kg orbits the Earth and has a period of
6520 s . A)Determine the radius of its circular orbit. Express your
answer using three significant figures and include the appropriate
units. B)Determine the magnitude of the Earth's gravitational force
on the satellite. Express your answer using three significant
figures and include the appropriate units. C)Determine the altitude
of the satellite. Express your answer using three significant
figures and include the appropriate units.

What is the minimum horizontal force that will cause a 5.00-kg
box to begin to slide on a horizontal surface when the coefficient
of static friction is 0.710? (Express your answer to three
significant figures.)

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