Answer:
The force used is 160 N, and the power used is 133 W.
Explanation:
Because the formula for force is Work/Distance, the answer in that case would be 800J/5m, and that would give you an answer of 160 N. For Power, the formula is Work/Time, and for that the expression would be 800/6, and that would give you 133 W as the power used.
Answer:
a) The time that the arrow spends in the air = 6.7 s
b) 5.59 s
Explanation:
Range of a projectile is given as
R = u² sin 2θ/g
R = 220 m
u = initial velocity = ?
g = 9.8 m/s²
θ = 45°
220 = [u² sin (2×45°)]/9.8
u = 46.43 m/s
Time of travel for a projectile = (2u sin θ)/g = (2 × 46.43 × sin 45°)/9.8 = 6.7 s
b) Using the equations of motion, we need to first obtain the time of fall of the Apple.
u = initial velocity = 0 m/s (since the Apple is dropped)
g = 9.8 m/s²
t = ?
y = 6 m
y = ut + gt²/2
6 = 0 + (9.8t²)/2
4.9t² = 6
t = 1.11 s
The Apple takes 1.11s to reach the required height, hence the amount of time to wait after the arrow has been shot for it to meet the dropped Apple = 6.7 - 1.11 = 5.59 s