COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 5, Problem 17QAP
To determine
Why does water stay in a bucket that is whirled around in a vertical circle
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A sample of blood is placed in a centrifuge of radius 16.0 cm. The mass of a red blood cell is 3.0 x 1-16 kg, and the magnitude of the force acting on it as it settles out of
the plasma is 4.0 x 10-11 N. At how many revolutions per second should the centrifuge be operated?
rev/s
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The accompanying figure shows a frictionless channel in the shape of a segment of a circle with center at
"O". The channel has been anchored to a frictionless horizontal tabletop. You are looking down at the table.
Forces exerted by the air are negligible. A ball is shot at high speed into the channel at "p" and exits at "r."
Consider the following distinct forces:
1. A downward force of gravity.
2. A force exerted by the channel pointing from q to O.
3. A force in the direction of motion.
4. A force pointing from O to q.
O 1 only.
Which of the above forces is (are) acting on the ball when it is within the frictionless
channel at position "q"?
O 1 and 2.
O 1 and 3.
O 1, 2, and 3.
q
O 1, 3, and 4.
r
If you walk along a log floating on a lake, why does the logmove in the opposite direction?
Chapter 5 Solutions
COLLEGE PHYSICS
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- Find the terminal velocity of a spherical bacterium (diameter 2.00 pm) falling in water. You will first need to note that the drag force is equal to the weight at terminal velocity. Take the density of the bacterium to be 1.10103 kg/m3.arrow_forwardAn amusement park ride consists of a large vertical cylinder that spins about its axis fast enough that any person inside is held up against the wall when the floor drops away (Fig. P5.60). The coefficient of static friction between person and wall is s, and the radius of the cylinder is R. (a) Show that the maximum period of revolution necessary to keep the person from falling is T=(42Rs/g)1/2. (b) If the rate of revolution of the cylinder is made to be somewhat larger, what happens to the magnitude of each one of the forces acting on the person? What happens in the motion of the person? (c) If the rate of revolution of the cylinder is instead made to be somewhat smaller, what happens to the magnitude of each one of the forces acting on the person? What happens in the motion of the person?arrow_forwardA sample of blood is placed in a centrifuge of radius 15.0 cm. The mass of a red blood cell is 3.0×10–16 kg, and the magnitude of the force acting on it as it settles out of the plasma is 4.0×10–11 N. At how many revolutions per second should the centrifuge be operated?arrow_forward
- The force on an airplane’s wing from the air flowing past it is mostly perpendicular to the wing’s flat surface; this is the force that holds the plane aloft in level flight. Given this fact, why do planes “bank” when making a turn?arrow_forwardSuppose you wish to whirl a pail full of water in a vertical circle at a constant speed without spilling any of its contents (even at the top of the circle!). If your arm is 0.65 m long (from shoulder to fist) and the distance from the handle to the surface of the water is 17 cm, what minimum speed is required?arrow_forwardA pail of water can be whirled in a vertical circular path such that no water is spilled. Why does the water remain in the pail, even when the pail is upside down? Explainarrow_forward
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