A) 30 m/s
The problem can be solved by using the law of conservation of momentum. In fact, the total momentum falcon+pigeon before the collision must be equal to the total momentum falcon+pigeon after the collision:
where
mf = 0.480 g is the mass of the falcon
uf = 45 m/s is the initial velocity of the falcon
mp = 0.240 g is the mass of the pigeon
up = 0 is the initial velocity of the pigeon
v is the final combined velocity of pigeon+falcon
Solving the equation for v, we find
B) 480 N
The average force on the pigeon during the impact is given by
where
is the change in momentum of the pigeon
is the duration of the collision
here we have:
- Change in momentum of the pigeon:
- Duration of the collision:
So the average force is
The answer given by E2020 is
"The padding around the goal post increases the time of the collision between the player and the post, which decreases the force exerted to bring the player to a stop"
B.absorb neutrons to prevent chain reactions which become uncontrollable
Gravity makes an upward-moving object move 9.8 m/s slower every second.
(30 m/s) / (9.8 m/s²) = 3.06 seconds (rounded)
Answer:
The ball will fall on the X .
Explanation:
At height, when the aeroplane is in great speed , everything attached with it acquires the same speed . So ball will also have the same speed as the aeroplane have. When ball starts falling off , it gets detached from plane but , at the same time it continues to travel with its earlier speed , because of inertia of motion. So it remains stationary with respect to plane in horizontal direction . It has velocity with respect to plane only in vertical direction. Hence it will fall on the X. It is due to first law of motion.