(II) A person stands on a platform, initially at rest, that can rotate freely without friction. The moment of inertia of the person plus the platform is I P . The person holds a spinning bicycle wheel with its axis horizontal. The wheel has moment of inertia I W and angular velocity ω W . What will be the angular velocity ω P of the platform if the person moves the axis of the wheel so that it points ( a ) vertically upward, ( b ) at a 60° angle to the vertical, ( c ) vertically downward? ( d ) What will ω P be if the person reaches up and stops the wheel in part ( a )?
(II) A person stands on a platform, initially at rest, that can rotate freely without friction. The moment of inertia of the person plus the platform is I P . The person holds a spinning bicycle wheel with its axis horizontal. The wheel has moment of inertia I W and angular velocity ω W . What will be the angular velocity ω P of the platform if the person moves the axis of the wheel so that it points ( a ) vertically upward, ( b ) at a 60° angle to the vertical, ( c ) vertically downward? ( d ) What will ω P be if the person reaches up and stops the wheel in part ( a )?
(II) A person stands on a platform, initially at rest, that can rotate freely without friction. The moment of inertia of the person plus the platform is IP. The person holds a spinning bicycle wheel with its axis horizontal. The wheel has moment of inertia IW and angular velocityωW. What will be the angular velocity ωP of the platform if the person moves the axis of the wheel so that it points (a) vertically upward, (b) at a 60° angle to the vertical, (c) vertically downward? (d) What will ωP be if the person reaches up and stops the wheel in part (a)?
Study of body parts and their functions. In this combined field of study, anatomy refers to studying the body structure of organisms, whereas physiology refers to their function.
3.31 A Ferris wheel with radius Figure E3.31
14.0 m is turning about a horizontal
axis through its center (Fig. E3.31).
The linear speed of a passenger on the
rim is constant and equal to 6.00 m/s.
What are the magnitude and direction
of the passenger's acceleration as she
passes through (a) the lowest point in
her circular motion and (b) the high-
est point in her circular motion? (c)
How much time does it take the Ferris
wheel to make one revolution?
1.56 ⚫. Three horizontal ropes pull on a large stone stuck in the
ground, producing the vector forces A, B, and C shown in Fig. P1.56.
Find the magnitude and direction of a fourth force on the stone that will
make the vector sum of the four forces zero.
Figure P1.56
B(80.0 N)
30.0
A (100.0 N)
53.0°
C (40.0 N)
30.0°
1.39 Given two vectors A = -2.00 +3.00 +4.00 and
B=3.00 +1.00 -3.00k. (a) find the magnitude of each vector;
(b) use unit vectors to write an expression for the vector difference
A - B; and (c) find the magnitude of the vector difference A - B. Is
this the same as the magnitude of B - Ä? Explain.
Chapter 11 Solutions
Physics for Scientists and Engineers with Modern Physics
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