We cannot predict the precise decay time of a particular radioactive 14C nucleus because
A) the calculation is too difficult for today's computers.
B) a single nucleus is too small to be seen or directly detected.
C) of the difficulty of determining the precise initial states of all its protons and neutron.
D) of the quantum entanglement of its protons and neutrons.
E) of quantum uncertainties.
E
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Which of the following does not increase the strength of a polymer?
(a) Orienting molecules (b) High molecular weight (c) Cross-links (d) Plasticizers
We slowly heat 100 g of water from 5 to 25°C. What is its change in entropy? (For water, c = 4186 kg.)
A. 582 J/K B. 29.2 K C. 139 J/K D. 6.95 J/K E. 0 F. Other (specify)
Water is sent from a firehose at 30.0 m/s at an angle of 30.0° above the horizontal. What is the maximum height reached by the water?
A. 7.50 m B. 11.5 m C. 15.0 m D. 19.0 m E. 30.0 m
A very small 51-g steel ball is released from rest and falls vertically onto a steel plate. The ball strikes the plate and is in contact with it for 0.50 ms. The ball rebounds elastically (at the same speed) and returns to its original height
The total time interval for a round trip is 3.00 s. What is the magnitude of the average force exerted on the ball by the plate during contact with the plate? A) 3000 N B) 1500 N C) 2490 N D) 2000 N E) 3500 N