Answer:
90 N
Explanation:
The force applied to the ball is given by:
where
is the change in momentum of the ball
is the time taken
The change on momentum of the ball is:
So, the force applied is
Answer: 187.68 m
Explanation:
Given
Time period
The time period of a pendulum is given by
where L=height of tower
Put values
Answer: The correct answer is A.
Explanation:
In magnets, there are two poles: South and north poles. Like poles repel each other. Unlike poles attract each other.
When two magnets of the opposite poles are brought together then the poles are attract each other.
When two magnets of the same poles are brought together then the poles are repel each other.
Therefore, the correct answer is A.
Fast-moving currents of air that occur above the friction layer are called jet streams.
The force required for the car is 5841 N
Explanation:
First of all, we need to find the acceleration of the car, which is given by:
where:
v = 27 m/s is the final velocity of the car
u = 0 is the initial velocity (the car starts from rest)
t = 6 s is the time the car takes to accelerate from u to v
Substituting, we find
Now we can find the force needed to accelerate the car; using Newton's second law of motion,
where:
F is the net force on the car
m = 1298 kg is the mass of the car
is the acceleration
Substituting, we find:
Learn more about force and acceleration:
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