6. A 1.15 kg mass oscillates according to the equation x = 0.650 cos 7.40 t where x is in meters and tin seconds. Determine (a) the amplitude, (b) the frequency, (c) the total energy, and (d) the kinetic energy and potential energy when x= 0.260 m.

need help answering question C

In the process of using the scientific method, a researcher: O Directly tests both the null and alternative hypotheses. O Directly tests only the alternative hypothesis because this is the hypothesis of interest. O Directly tests only the null hypothesis because this is the hypothesis of interest. O Directly tests only the null hypothesis because the null hypothesis leads to a specific prediction that can be compared with data. O Can not directly test either hypothesis.

IF YOU CAN NOT ANSWER BOTH DO NOT ANSWER  ALSO ANSWER IN 3 SIG FIG USING SCIENTIFIC NOTATION USING E