Answer:
D. 520 N
Explanation:
According to the impulse theorem, the change in momentum of the ball is equal to the impulse exerted on the ball, mathematically:
where
is th change in momentum
F is the average force exerted on the ball
is the time of contact
The change in momentum of the ball is
where
m = 57 g = 0.057 kg is the mass of the ball
u = 45 m/s is the initial velocity
v = -33 m/s is the final velocity (in the opposite direction)
Substituting,
The time of the collision is
Therefore, the average force is
So, the magnitude is approximately 520 N.
Answer:,20,15.7
Explanation:
Frequency is defined as the number of revolutions made the object in unit time.
Given that it takes minutes revolutions.
So, revolutions can be completed in minute.
So, revolutions can be completed in a second.
So,frequency is
Period of a object is the inverse of frequency.
Inverse of frequency
So,period is .
Speed of car is the given by the ratio of distance covered in one revolution to the time period.
Distance travelled in one period is where is the diameter.
Given that
So,distance travelled in one revolution
Time period is .
Speed is
The object in the lower orbit will move faster in its orbit, and will have a shorter orbital period. None of that depends on their masses either.
the answer is true like and sub to zeelitmotion :