A bubble having a diameter of 1.00 cm is released from the bottom of a swimming pool where the depth is 5.00 m. What will the diameter of the bubble be when it reaches the surface? The temperature of the water at the surface is 20.0°C, whereas it is 15.0°C at the bottom. (The density of water is 1.00 × 10^3 kg/m3.)
a. 1.05 cm
b. 1.15 cm
c. 1.45 cm
d. 1.65 cm
e. 1.35 cm
B
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Concrete is a composite with a matrix of hydrated _________cement, and the reinforcement is aggregate with sizes ranging from fine sand to coarse rocks.
Fill in the blank(s) with the appropriate word(s).
A 20 kg clock resting on the floor is to be raised by a 5.0 mm diameter rope with young's modulus 1.5 X 10^9 n/M^2. The rope goes up and over a pulley that is 2.5 m above the floor. You hold the at a point 1.5 m above the flow and pull hard enough to lift the block just off the floor. By how much does the rope stretch?
A. 3.0 mm B. 6.3 mm C. 9.3 mm D. 13 mm
A 2.4-kg ball falling vertically hits the floor with a speed of 2.5 m/s and rebounds with a speed of 1.5 m/s. What is the magnitude of the impulse exerted on the ball by the floor?
a. 9.6 N s b. 2.4 N s c. 6.4 N s d. 1.6 N s e. 1.0 N s
An ohm is equal to which of these?
A. A Coulomb per second B. A volt C. A volt per ampere D. An ampere per second