- #1
aarietta
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Hello everyone!
I am having a little trouble with my physics homework and am hoping for someone(s) to confirm if I am on the right track. Please and thank you!
1. In a total time of 2.0min, a duck on a pond paddles 22m [36° N of E] and then paddles another 65m [25° E of S].
Determine the duck's
i) total distance travelled
Total = 22m + 65m = 87m
ii) average speed
v = d/t = 87m/120s = 0.73m/s
iii) total displacement
a² = b² + c²
65² = 22² +c²
c = 61
iv) average velocity
v = d/t = 65-22/120 = 0.36m/s[E]
2. The skid marks of a car was 150m from the point where the driver applied the brakes to where the car came to rest. The driver was traveling at 80km/h(22m/s) when the brakes were applied. Calculate the acceleration of the vehicle.
Vf² = Vi² + 2aΔd
0 = (22m/s)² + 2a(150m)
484/150 = 2a
a = 1.6m/s²
3. An archer shoots an arrow straight up into the air with an initial velocity of 45m/s . Calculate the maximum height of the arrow.
Vf² = Vi² + 2aΔd
0 = (45m/s)² + 2(-9.8m/s²) Δd
Δd = -2025/-19.6
Δd = 103m
Thank you once again!
I am having a little trouble with my physics homework and am hoping for someone(s) to confirm if I am on the right track. Please and thank you!
1. In a total time of 2.0min, a duck on a pond paddles 22m [36° N of E] and then paddles another 65m [25° E of S].
Determine the duck's
i) total distance travelled
Total = 22m + 65m = 87m
ii) average speed
v = d/t = 87m/120s = 0.73m/s
iii) total displacement
a² = b² + c²
65² = 22² +c²
c = 61
iv) average velocity
v = d/t = 65-22/120 = 0.36m/s[E]
2. The skid marks of a car was 150m from the point where the driver applied the brakes to where the car came to rest. The driver was traveling at 80km/h(22m/s) when the brakes were applied. Calculate the acceleration of the vehicle.
Vf² = Vi² + 2aΔd
0 = (22m/s)² + 2a(150m)
484/150 = 2a
a = 1.6m/s²
3. An archer shoots an arrow straight up into the air with an initial velocity of 45m/s . Calculate the maximum height of the arrow.
Vf² = Vi² + 2aΔd
0 = (45m/s)² + 2(-9.8m/s²) Δd
Δd = -2025/-19.6
Δd = 103m
Thank you once again!