Answer:
The intensity in 10-3 W/m2 at 39.3 m is
Explanation:
Given Data:
frequency=1,054 Hz
intensity=6.429 mW/m^2
distance=7.945 m.
Required:
intensity in 10^-3 W/m^2 at 39.3 m=?
Solution:
Intensity at distance r from point source which is emitting sound waves of power P is given by the following formula:
Intensity=I=
Where:
P is the power
r is the distance
The intensity in 10^-3 W/m2 at 39.3 m is
Answer:
The answer is B
Explanation:
Only things that are moving have kinetic energy, therefore B is the only correct answer
Taking the vertical component of the displacement
1.1 - 0.2 = 0.9 mile
The horizontal component of the displacement
-0.3 mile
The magnitude of the displacement is
√[ (0.9)² + (-0.3) ] = 0.95 mile
The direction is
θ = tan-1 (-0.3/0.9)
θ = 161.57 degrees.
Answer: 48 m
Explanation:
Since we are dealing with constant acceleration, we can use the following equations:
(1)
(2)
Where:
is the cart’s final velocity
is the cart’s initial velocity
is the cart's acceleration
is the time
is the cart's displacement
So, firstly we have to find from (1):
(3)
(4)
Isolating from (2) and substituting (4):
(5)
(6)
Finally:
Answer:
- 0.5 m/s²
Explanation:
m = mass of the clarinet case = 3.230 kg
W = weight of the clarinet case in downward direction
a = vertical acceleration of the case
Weight of the clarinet case is given as
W = mg
W = 3.230 x 9.8
W = 31.654 N
F = Upward force applied = 30.10 N
Force equation for the motion of the case is given as
F - W = ma
30.10 - 31.654 = 3.230 a
a = - 0.5 m/s²