A person holds a ladder horizontally at its center.
Treating the ladder as a uniform rod...
A person holds a ladder horizontally at its center.
Treating the ladder as a uniform rod of length 3.10 m and mass
8.56 kg , find the torque the person must exert on the ladder to
give it an angular acceleration of 0.238 rad/s2 .
Solutions
Expert Solution
If a person holds a ladder horizontally at its center.
A person with mass m1 = 80 kg person climbs a uniform ladder
with mass m2 = 40 kg and length L = 10 m long that rests against a
vertical frictionless wall at an angle of θ = 70° with the floor.
When the person climbs 7.0 m from the base of the ladder, the
ladder starts to slip. When answering the questions, use the
symbolic notations given before using numerical substitutions.
B)Find the force of the wall Fw...
A person holds a rifle horizontally and fires at a target. The bullet has a muzzle speed of 200m/s and the person hears the bullet strike the target 1.00s after firing it. The air temp is 72 degrees Fahrenheit. What is the distance to the target?
A person holds a rifle horizontally and fires at a target. The
bullet has a muzzle speed of 155 m/s, and the person hears the
bullet strike the target 0.70 s after firing it. The air
temperature is 77°F. What is the distance to the target
6.
A person holds a rifle horizontally and fires at a target. The
bullet has a muzzle speed of 150 m/s, and the person hears the
bullet strike the target 0.80 s after firing it. The air
temperature is 71°F. What is the distance to the target?
A person stands at the center of a turntable, holding his arms
extended horizontally with a 1.5 kg dumbbell in each hand. He is
set rotation about a vertical axis, making one revolution in 2
seconds. Find the new angular velocity if he pulls the dumbbells in
to his middle. His moment of inertia (without dumbbells) is 3 kgm2
when his arms are out stretched, dropping to 2.2 kgm2 when his
hands are at his middle. The dumbbells are 1...
A 45.4 kg, 3.8 m uniform ladder leans against a frictionless
wall. A 99.1 kg person is standing on the ladder down 1.04 m from
the top of the ladder. The ladder makes an angle of 50 degrees with
the horizontal. What is the minimum coefficient of static friction
between the ladder and the ground so that the ladder does not
slip?
A uniform ladder is 16 m long and weighs 240 N. In the figure,
the ladder leans against a vertical, frictionless wall at height
h = 7.0 m above the ground. A horizontal force F→ is
applied to the ladder at distance d = 2.8 m from its base
(measured along the ladder). If force magnitude F = 46 N,
what are (a)x-,
(b)y-components of the force of the
ground on the ladder? If F = 140 N, what are...
A 14.0 m uniform ladder weighing 480 N rests against a
frictionless wall. The ladder makes a 63.0°-angle with the
horizontal.
(a)
Find the horizontal and vertical forces (in N) the ground exerts
on the base of the ladder when an 850-N firefighter has climbed
4.10 m along the ladder from the bottom.
horizontal force
magnitude Ndirection ---Select--- towards the wall away from the
wall
vertical force
magnitude Ndirection ---Select--- up down
(b)
If the ladder is just on the...
A 14.0 m uniform ladder weighing 490 N rests against a
frictionless wall. The ladder makes a 59.0°-angle with the
horizontal. (a) Find the horizontal and vertical forces (in N) the
ground exerts on the base of the ladder when an 810-N firefighter
has climbed 4.10 m along the ladder from the bottom. horizontal
force magnitude N direction vertical force magnitude N direction
(b) If the ladder is just on the verge of slipping when the
firefighter is 9.40 m...
A horizontal insulating rod, of length L, has a uniform charge
density of theta on its
right half and of negative theta on its left half. Find the net
force on a test charge of magnitude
q placed to the right of the rod, on the axis of the rod, a
distance x from the center
of the rod (where x > L=2).