The figure below shows the unusual path of a confused football player. After receiving a kickoff at his own goal, he runs downfield to within inches of a touchdown, then reverses direction and races back until hes tackled at the exact location where he first caught the ball. During this run, which took 25 s, what is his average velocity in the x-direction?
1.100 yd
2.200 yd
3.0.00 yd
4.It is more than 100 yd, but you must know the exact path to say exactly.
[Ques. 2] The figure below shows the unusual path of a confused football player. After receiving a kickoff at his own goal, he runs downfield to within inches of a touchdown, then reverses direction and races back until hes tackled at the exact location where he first caught the ball. During this run, which took 25 s, what is his displacement?
[Ques. 3] The figure below shows the unusual path of a confused football player. After receiving a kickoff at his own goal, he runs downfield to within inches of a touchdown, then reverses direction and races back until hes tackled at the exact location where he first caught the ball. During this run, which took 25 s, what is the path length he travels?
[Ques. 4] If the Q value of an endothermic reaction is 2.17 MeV, then the minimum kinetic energy needed in the reactant nuclei if the reaction is to occur must be
1.equal to 2.17 MeV.
2.greater than 2.17 MeV.
3.less than 2.17 MeV.
4.exactly half of 2.17 MeV.
[Ques. 5] Suppose the decay constant of radioactive substance A is twice the decay constant of radioactive substance B. If substance B has a half-life of 4 h, what's the half-life of substance A?
1.8 h
2.4 h
3.2 h
[Ques. 6] What fraction of a radioactive sample has decayed after two half-lives have elapsed?
1.1/8
2.3/4
3.7/8
4.none of these
[Ques. 7] True or False: A radioactive atom always decays after two half-lives have elapsed.
1.False
2.True
[Ques. 8] Krypton (atomic number 36) has how many electrons in its next-to-outer shell (n = 3)?
1.2
2.4
3.8
4.18
[Ques. 9] When the principal quantum number is n = 5, how many states have distinct pairs of values of and m?
1.1
2.5
3.9
4.25
[Ques. 10] When the principal quantum number is n = 5, how many different values of m are possible?
1.1
2.5
3.9
4.25
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