6. f = 128.62 
, T= 0.0077775 s
7. f = 2.2 * 
, T = 4.545 * 
s
8. 32.64
9. 3.29 * 
Explanation:
Step 1:
6.
For light and sound v = fλ
where v represents the velocity
f represents the frequency
λ represents the wavelength
λ = 2.69 m
v = 346 m/s
f = v/λ = 346/2.69 = 128.62
Time period is the reciprocal of frequency
T = 1/128.62 = 0.0077775 s
Step 2:
7.
λ = 110 cm = 1.1 m
v = 2.42* m/s
f = 2.42*/1.1 = 2.2 *
T = 1/(2.2*) = 4.545 * s
Step 3:
8.
λ = 10.6 m
v = 346 m/s
f = v/λ = 346/10.6 = 32.64
Step 4:
9.
λ = 5.89 * 
m
v = 1.94 * 
m/s
f = v/λ = 3.29 *
Answer:
A force that resists motion between two objects that are in contact; rubbing together of two objects = <em>Friction</em>
<em />
The tendency of an object to float = <em>Buoyancy</em>
<em />
A push or pull; any quantity that produces or is capable of producing motion = <em>Force</em>
<em />
A universal force that every mass exerts on every other mass; this keeps us down on earth = <em>Gravity</em>
<em />
A free body diagram is a diagram that labels all the forces acting on an object. This allows us to find the net force on an object = <em>Free body diagram</em> (it literally says it in the definition lol)
<em />
Answer:
do explain what u need help with?
Answer:
a) F = 1.26 10⁵ N, b) F = 2.255 10³ N, c) F_ {soil} = 3078 N
Explanation:
For this exercise we will use the relationship between momentum and moment
I = Δp
F t = p_f -p₀
a) with stiff legs, final speed is zero, initial velocity is down
Ft = 0-p₀
F = m v / t
let's calculate
F = 84.0 6.82 / 4.56 10⁻³
F = 1.26 10⁵ N
b) bending the legs
let's calculate
F = 84.0 6.82 / 0.254
F = 2.255 10³ N
c) It is requested to calculate the force of the ground on the man
∑ F = F_soil -W
F_soil = F + W
F_ {soil} = 2.255 103 + 84 9.8
F_ {soil} = 3078 N
