The answer is B. An antitussive will help a cough by deterring the cough reflex.
Answer:
27.6 m/s
5.64 s
Explanation:
Given:
Δy = 39 m
a = -9.8 m/s²
v = 0 m/s
Find: v₀
v² = v₀² + 2aΔy
(0 m/s)² = v₀² + 2 (-9.8 m/s²) (39 m)
v₀ = 27.6 m/s
Find: 2t
Δy = vt − ½ at²
(39 m) = (0 m/s) t − ½ (-9.8 m/s²) t²
t = 2.82 s
2t = 5.64 s
Explanation:
a)
The circumference of the path is:
C = 2πr
C = 2π (0.235 m)
C = 1.48 m
Velocity = displacement / time
v = 1.48 m / 1.95 s
v = 0.757 m/s
b)
1 rev / 1.95 s = 0.513 Hz
c)
1 rev / 1.95 s × (2π rad / rev) = 3.22 rad/s
Answer : The acceleration of the elevator is,
Explanation :
Formula used to calculate the acceleration of the elevator is:
where,
F = force = 844 M
m = mass of man = 70 kg
g = acceleration due to gravity =
a = acceleration of the elevator = ?
Now put all the given values in the above formula, we get:
Thus, the acceleration of the elevator is,