Answer:
(a) A+B = 2i-3j
(B) A-B = 4i + j
Explanation:
We have given two vectors A = 3i-j and B = -1-2j
We have to find the two vectors that is A+B and A-B
(A) In first art we have calculate A+B for this we have to add simply vector A and v ector B
So A+B = 3i-j-i-2j = 2i-3j
(B) In this part we have to find A-B for this we have to simply subtract B from A so A-B = 3i-j-(-i-2j) =3i-j+i+2j =4i+j
Answer: The rising and setting of the Sun.
The appearance and disappearance of the Moon.
Changes in season.
Appearance and disappearance of the Stars.
Explanation: The rising and setting of the Sun helps can be used as a standard to determine time since the rissing and setting of the Sun occurs at similar time and interval in a given geographical ocation.
The appearance and disappearance of the Moon which occurs during the night and early hours of the morning is similar in a given geographical locationation so it can be used as a standard for Time.
Change in season is another natural phenomenon which occurs at similar times in a given geographical location like Winter/summer, rainy/dry etc can be used as standards for time.
The appearance and disappearance of the Stars can also b used as standards for time in a given geographical location.
Because a variable is an important stratagy of science
Answer: t=72.5secs and f= 0.194Hz
Explanation:
0.938=e^[-bt/(2M)]
ln(0.938) = -(0.113 kg/s)(t) / [2(64.0 kg)]
t = 72.5 s
ω = sqrt[k/m - {b/(2M)}²]
ω = sqrt[(113 N/m)/(64.0 kg) - {(0.113kg/s)/(2(64.0 kg))}²]
ω = 1.33 rad/s
2πf = 1.33 rad/s
f = 0.194 Hz
