When a 4 cubic ft block of wood floats in a fluid whose weight density is 60 pounds per cubic foot, 3/4 of the block's volume is submerged. The buoyant force on the block is __________
Fill in the blank(s) with correct word
180 lbs
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Power: A 9.0-V battery costs $1.49 and will run a portable CD player for 6.0 hours before running down and needing to be replaced. If this battery supplies a current of 25 mA to the player, what is the cost of the energy provided by the battery in dollars per kWh?
A. $11/kWh B. $110/kWh C. $1100/kWh D. $11,000/kWh
A sound with ten times the amplitude of another sound is judged to be ten times as loud
a. True b. False Indicate whether the statement is true or false
A wheel of radius R is rolling on a horizontal surface. Its center is moving forward with speed v. A point on the wheel a distance r/3 below the center is moving forward at a speed 2v/3. The wheel is
A) rolling without slipping. B) not rotating at all. C) made of rubber. D) slipping because its angular speed is too low to be rolling without slipping. E) slipping because its angular speed is too high to be rolling without slipping.
Two solenoids of equal length are each made of 2 000 turns of copper wire per meter. Solenoid I has a 5.00 cm radius; solenoid II a 10.0 cm radius. When equal currents are present in the two solenoids, the ratio of the magnitude of the magnetic field BI along the axis of solenoid I to the magnitude of the magnetic field BII along the axis of solenoid II, BI/BII, is
a. 1/4. b. 1/2. c. 1. d. 2. e. 4.