Related questions with answers

To study damage to aircraft that collide with large birds, you design a test gun that will accelerate chicken-sized ob- jects so that their displacement along the gun barrel is given by $x=\left(9.0 \times 10^3 \mathrm{~m} / \mathrm{s}^2\right) t^2-\left(8.0 \times 10^4 \mathrm{~m} / \mathrm{s}^3\right) t^3$ . The object leaves the end of the barrel at $t=0.025$ s.
( $c$ ) What net force must be exerted on a $1.50$ - $\mathrm{kg}$ object at (i) $t=0$ and (ii) $t=0.025$ s?

To study damage to aircraft that collide with large birds, you design a test gun that will accelerate chicken-sized objects so that their displacement along the gun barrel is given by $x = \left( 9.0 \times 10 ^ { 3 } m / s ^ { 2 } \right) t ^ { 2 } - \left( 8.0 \times 10 ^ { 4 } m / s ^ { 3 } \right) t ^ { 3 }$ . The object leaves the end of the barrel at t = 0.025 s. (a) How long must the gun barrel be? (b) What will be the speed of the objects as they leave the end of the barrel? (c) What net force must be exerted on a 1.50-kg object at (i) t = 0 and (ii) t = 0.025 s?

Before leaving Earth, the mass of an astronaut is measured to be $60 \mathrm{~kg}$ . The astronaut lands on the moon and measures the acceleration of gravity to be $1.6 \mathrm{~m} / \mathrm{s}^2$ .