The half-life of 131I is 8 days. On a certain day, the activity of an 131I sample is 6.4 mCi. What is its activity 40 days later?
200 mCi
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Each atom in a mole of water vapor (H2O) has one electron removed. What is the total charge of the ionized gas?
A. 96 kC B. 290 kC C. 600 kC D. 190 kC
The bob of a simple pendulum has its maximum kinetic energy at the
A) top of its swing. B) bottom of its swing. C) midpoint between top and bottom. D) at all points along its path of swing.
What different resistances can be obtained by using two 2.0-? resistors and one 4.0-? resistor? You must use all three of them in each possible combination
What will be an ideal response?
The 1 560 kg solid steel door to a bank vault is 2.00 m high, 1.00 m wide and 10 cm thick. One hinge is 60.0 cm down from the top on the left hand side of the door. The other hinge is 30.0 cm up from the bottom. What horizontal force, in what direction, does the door exert on the upper hinge?
a. 6 950 N, left b. 6 950 N, right c. 7 640 N, left d. 7 640 N, right e. 15 300 N, left