During a rainy day football game, an 854 N (i. e., 192 lb) quarterback is standing holding the ball looking for a
receiver when he's unkindly hit by a 1281 N (i. e., 288
b) tackle charging in at 6.1 m/s. At what speed do the
two men, tangled together, initially sail off on the wet
field?
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Henry, whose mass is 95 kg, stands on a bathroom scale in an elevator. the scale reads 830 n for the first 2.4 s after the elevator starts moving, then 930 n for the next 2.4 s. part a what is the elevator's speed 4.8 s after starting? express your answer with the appropriate units.

Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.

Scientific models are based on current knowledge, which can limit their effectiveness when new discoveries are made.