Ideally, a ball is thrown up at an angle and lands downrange. Because of air resistance, the distance reached is
A) less.
B) the same.
C) greater.
D) need more information
Answer: A
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Dry air at 20ºC, 101 kPa, passes through a 2-cm diameter tube at 5 m/s. If the tube is also at 20ºC and has acetone on its inside surface area, estimate the evaporation rate of acetone into air per unit area. Assume the density of saturated vapor acetone is 2.37 g/m^3.
What will be an ideal response?
When a switch is closed to complete a DC series RL circuit,
a. the electric field in the wires increases to a maximum value. b. the magnetic field outside the wires increases to a maximum value. c. the rate of change of the electric and magnetic fields is greatest at the instant when the switch is closed. d. all of the above are true. e. only (a) and (c) above are true.
You measure a 20-V potential difference across a 7.0-? resistor. What is the current flowing through it?
a. 140 A b. 2.9 A c. 27 A d. 13 A e. 5.2 A
All __________ galaxies are spiral galaxies that have small, luminous nuclei
a. active b. radio c. Seyfert d. double-lobed radio e. blazar