A person is in a closed room (a racquetball court) with v = 453 m 3 hitting a ball (m 42.0 g) around at random without any pauses. The average kinetic energy of the ball is 2.30 J. (a) What is the average value of v x 2 ? Does it matter which direction you take to be x ? (b) Applying the methods of this chapter, find the average pressure on the walls? (c) Aside from the presence of only one "molecule" in this problem, what is the main assumption in Pressure, Temperature, and RMS Speed that does not apply here?
A person is in a closed room (a racquetball court) with v = 453 m 3 hitting a ball (m 42.0 g) around at random without any pauses. The average kinetic energy of the ball is 2.30 J. (a) What is the average value of v x 2 ? Does it matter which direction you take to be x ? (b) Applying the methods of this chapter, find the average pressure on the walls? (c) Aside from the presence of only one "molecule" in this problem, what is the main assumption in Pressure, Temperature, and RMS Speed that does not apply here?
A person is in a closed room (a racquetball court) with
v
=
453
m3 hitting a ball (m 42.0 g) around at random without any pauses. The average kinetic energy of the ball is 2.30 J. (a) What is the average value of
v
x
2
? Does it matter which direction you take to be x ? (b) Applying the methods of this chapter, find the average pressure on the walls? (c) Aside from the presence of only one "molecule" in this problem, what is the main assumption in Pressure, Temperature, and RMS Speed that does not apply here?
The plunger of a syringe has an internal diameter of 1.0 cm and the end of the needle
has an internal diameter of 0.35 mm. A practitioner lightly squeezes the plunger, but
no serum is emitted by the needle into a vein. So the practitioner gradually increases
the squeezing force that she exerts on the plunger such that serum begins to be
emitted from the needle into the vein. Assuming no surface tension or friction, what is
the minimum squeezing force that the practitioner applies to the plunger in order that
serum begins to be emitted from the needle into the vein? Take the pressure of blood
in the vein to be 20 mmHg above that of atmospheric pressure.
0.70 N
3.3 N
0.21 N
0.24 N
1.4 N
17N
A person is in a closed room (a racquetball court) with V = 453 m3 hitting a ball (m = 42.0 g) around at random without any pauses. The average kinetic energy of the ball is 2.30 J. (a) What is the average value of vx 2 ? Does it matter which direction you take to be x? (b) Applying the methods of this chapter, find the average pressure on the walls? (c) Aside from the presence of only one “molecule” in this problem, what is the main assumption in Pressure, Temperature, and RMS Speed that does not apply here?
The plunger of a syringe has an internal diameter of 1.0 cm and the end of the
needle has an internal diameter of 0.35 mm. A practitioner lightly squeezes the
plunger, but no serum is emitted by the needle into a vein. So the practitioner
gradually increases the squeezing force that she exerts on the plunger such that
serum begins to be emitted from the needle into the vein. Assuming no surface
tension or friction, what is the minimum squeezing force that the practitioner appli
to the plunger in order that serum begins to be emitted from the needle into the
vein? Take the pressure of blood in the vein to be 20 mmHg above that of
atmospheric pressure.
0.70 N
1.4 N
3.3 N
1.7 N
0.21 N
0.24 N
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