## Transcribed Text

The blades in a blender rotate at a rate of 7000 rpm. When the motor is turned off during operation, the blades slow to rest in 3.0 S. What is the angular acceleration as the blades slow down?
rad/s²
-/3 points Giancoli7 B.P.007.
A grinding wheel 0.59 m in diameter rotates at 2100 rpm.
(a) Calculate its angular velocity in rad/s.
rad/s
(b) What are the linear speed and acceleration of a point on the edge of the grinding wheel?
linear speed
m/s
radial acceleration
m/s²
+ -/1 points Giancoli7 8.P.018.
A centrifuge accelerates from rest to 12,000 rpm in 240 s. Through how many revolutions did it turn in this time?
revolutions
-/2 points Giancoli7 8.P.025.
Calculate the net torque about the axle of the wheel shown in the figure below. Assume that a friction torque of 0.44 m-N opposes the motion and that F = 18 N.
Magnitude
m-N
Direction
counterclockwise
clockwise
35N
28 N
135
12 cm
24cm
F
In the figure below, m = 1.4 kg and M = 2.5 kg.
iy
1.50 m
0.50 m
axis
0.50 m
x
M
M
(a) Calculate the moment of inertia of the array of point objects shown in the figure about the vertical axis.
kg.m2
(b) Calculate the moment of inertia of the array of point objects shown in the figure about the horizontal axis.
kg.m²
Assume the objects are wired together by very light rigid pieces of wire. The array is rectangular and it is split through the middle by the horizontal axis.
About which axis would it be harder to accelerate this array?
the horizontal axis
neither axis
the vertical axis
-/2 points Giancoli7 8.P.041.
A teenager pushes tangentially on a small hand-driven merry-go-round and is able to accelerate it from rest to a has a mass of 600 kg, and two children (each with
opposite each other on the edge. Calculate the torque required to produce the acceleration, neglecting frictional torque.
m-N
What force is required at the edge?
N
-/1 points Giancoli7 8. P.052.
A bowling ball of mass 6.7 kg and radius 9.0 cm rolls without slipping down a lane at 5.0 m/s. Calculate its total kinetic energy.
J

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