The loaded cab of an elevator has a mass of 3.6 × 103
kg and moves...
The loaded cab of an elevator has a mass of 3.6 × 103
kg and moves 216 m up the shaft in 17 s at constant speed. At what
average rate does the force from the cable do work on the cab?
The cable of the 1800 kg elevator cab in the figure snaps when
the cab is at rest at the first floor, where the cab bottom is a
distance d = 4.9 m above a spring of spring constant k = 0.33 MN/m.
A safety device clamps the cab against guide rails so that a
constant frictional force of 3.2 kN opposes the cab's motion. (a)
Find the speed of the cab just before it hits the spring. (b) Find...
A loaded truck of mass 3000 kg moves on a level road
at a constant speed of 6.000 m/s. The frictional force on the truck
from the road is 1000 N. Assume that air drag is negligible. (a)
How much work is done by the truck engine in 10.00 min? (b) After
10.00 min, the truck enters a hilly region whose inclination
is30∘and continues to move with the same speed for another 10.00
min. What is the total work done...
An elevator packed with people has a mass of 1900 kg.
The elevator accelerates upward (in the positive direction) from
rest at a rate of 1.95 m/s2 for 2.4 s. Calculate the
tension in the cable supporting the elevator in newtons.
The elevator continues upward at constant velocity for 8.1 s.
What is the tension in the cable, in Newtons, during this time?
The elevator experiences a negative acceleration at a rate of
0.75 m/s2 for 2.8 s. What is...
An elevator with mass 500 Kg starts from rest and moves upward
20.0 m in 5.00 s. What is the average rate with which the force
from the cable is doing work on the elevator?
g = 9.8 m / s2
A 1000-kg elevator is moving downwards in a skyscraper, with
constant velocity. The elevator moves a total distance of 400 m.
What is the work done on the elevator cage by the tension of the
suspension cable? Take g=9.81 m/s2.
A sledge loaded with bricks has a total mass of 18.2 kg and is
pulled at constant speed by a rope. The rope is inclined at 20.1°
above the horizontal, and the sledge moves a distance of 19.2 m on
a horizontal surface. The coefficient of kinetic friction between
the sledge and surface is 0.500.
(a) What is the tension of the rope?
N
(b) How much work is done by the rope on the sledge?
kJ
(c) What is...
An elevator (1500 kg mass, with passengers) is attached to a
1000 kg counterweight by a cable that is wrapped over a pulley. It
is also attached (by a second cable) to a motor. The elevator is
moving down at a constant speed of 5 m/s.
a) Determine the force that the motor must apply to the second
cable.
b) Determine the force that the motor must exert to lower the
elevator with a constant downward acceleration of 1 m/s^2....
A box with mass 0.0325 kg moves in a vertical circle that has a
radius of 0.600 m on the inside of a circular track. When the box
is at the bottom of its path, point A, the magnitude of the normal
force exerted on the box by the track has magnitude 3.75 N. When
the box reaches the top of its path, point B, the magnitude of the
normal force exerted on the box has magnitude 0.665 N.
How...
A certain elevator cab has a total run of 193 m and a maximum
speed is 322 m/min, and it accelerates from rest and then back to
rest at 1.18 m/s2. (a) How far does the
cab move while accelerating to full speed from rest?
(b) How long does it take to make the nonstop 193
m run, starting and ending at rest?
Two balls collide elastically. Ball A has a mass of 3.00 kg and
moves to the right at 2.00 m/s. Ball B has a mass of 1.29 kg, and
moves to the left, also at 2.00 m/s.The balls collide head-on.
1) Find the speed of Ball A after the collision.
2) Find the speed of Ball B after the collision.
3) Find the impulse delivered to Ball A during the
collision.
4)Find the impulse delivered to Ball B during the...