Explanation:
a. " for every action there is an equal and opposite reaction".
b. The electric fan does not stop moving just after the switch turns off because of rational inertia force.
c. The force applied to first vehicle is 120N.
d. In my view it doesn't support the law of conservation of momentum. Momentum of 1 and 2 object before the collision is equal to the total momentum of two object after collision.
Answer:
5.75m/s
Explanation:
The formula we need to use here is the formula of centripetal acceleration given as

we have the acceleration and the radius (luckly in the units we need them to be)
replacing it would yield

then solving for v

(notice how m/
* m yields
which when applying the square root yield m/s)
Answer:
53.4 m/s
Explanation:
For a standing wave on a string, the fundamental frequency is given by

where
v is the wave speed
f is the frequency
L is the length of the string
For the wave on the guitar string in this problem, we have
is the fundamental frequency
L = 89 cm = 0.89 m is the length of the string
Solving the equation for v, we find the wave speed:

because of gravitional pull