Optical telescopes are usually used only at night, but radio telescopes can be used day or night
Indicate whether the statement is true or false
TRUE
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If a dense 20.0-kg object is falling in air at half its terminal velocity, what is the drag force on the object at this moment?
a. 24.5 N b. 49.0 N c. 69.3 N d. 98.0 N e. 139 N
One mole of an ideal gas is held at a constant pressure of 1 atm. Find the change in volume (in liters) if the temperature changes by 50°C
a. 1 b. 2 c. 3 d. 4 e. 5
An emf of 0.26 V is induced in a 0.40-H inductor. What is the rate of change of current through the inductor?
a. 0.80 A/s c. 0.13 A/s b. 1.3 A/s d. 0.65 A/s
In the open ocean, surface currents are most affected by
A) winds, the Coriolis force, the pressure-gradient force, and land boundary conditions. B) frictional force (winds), the Coriolis force, and the pressure-gradient force. C) winds and gyres. D) both winds and the Coriolis force.