Answer:
a) 1.248 rad/s
b) 13.728 m/s
c) 0.52 rad/s^2
d) 17.132m/s^2
Explanation:
You have that the angles described by a astronaut is given by:
(a) To find the angular velocity of the astronaut you use the derivative og the angle respect to time:
Then, you evaluate for t=2.40 s:
(b) The linear velocity is calculated by using the following formula:
r: radius if the trajectory of the astronaut = 11.0m
You replace r and w and obtain:
(c) The tangential acceleration is:
(d) The radial acceleration is:
Answer:
a) When the train is approaching the frequency is 477.19 Hz and the wavelenght is 0.719 m
b) When the train is leaving the crossing the frequency is 367.152 Hz and the wavelenght is 0.934 m
Explanation:
Given data:
v = speed of the train = 44.7 m/s
V = speed of the sound = 343 m/s
f = frequency of sound = 415 Hz
a) If the train is approaching, the frequency is:
The wavelength is:
b) If the train leaves the crossing, the frequency is:
The wavelength is:
Answer:
2.71 m
Explanation:
Force is the product of mass and acceleration
F=m*a
Work done is the product of force and distance
Work done=F*d
In this case;
F= 35 N
Work done = 95 J
95 =35 * d
95 /35 = d
2.71 m= d
A) the universe is expanding
Every galaxy is moving away from each other - not just us. And the further they are away, the faster they are moving