Answer:
686.7N
Explanation:
Given data
Mass= 70kg
We know that the buoyant force experienced by the person is equal to the weight of the person
Hence the weight is
Weight = mass* Acceleration
Weight= 70*9.81
Weight= 686.7N
Therefore the weight is 686.7N
Answer:
The velocity of an object is the rate of change of its position with respect to a frame of reference, and is a function of time. Velocity is equivalent to a specification of an object's speed and direction of motion (e.g. 60 km/h to the north).
Answer:
A. 0.0096 W/m²
B. 11.603 dB
C. 827.37 m/s
Explanation:
Parameters given:
Frequency, f = 274Hz
Pressure, P = 101.3 kPa
Temperature, T = 25°C = 298K
Power = 30 mW
Radial distance, = 500 mm = 0.5 m
A. Intensity = Power/Area
Intensity = Power/(4*pi*r²)
= (30 * 10^(-3))/(4 * 3.142 * 0.5²)
= 0.0096 W/m²
B. Pressure(rms) = √(I*ρ*c)
I = Intensity
ρ = density
c = speed of sound
ρ = P/RT
R = gas constant
=> ρ = (101.3 * 10^3) / (298 * 8.314)
ρ = 40.89 kg/m³
=> Pressure(rms) = √(0.0096 * 40.89 * 343)
= √(134.64)
= 11.603 dB = 11.603 * 10^(-6) Pa
C. Acoustic Particle velocity = Intensity/ Acoustic Pressure
Acoustic Particle velocity = 0.0096 / (11.603 * 10^(-6)
Acoustic Particle velocity = 827.37 m/s
Absorbing Heat is absorbed through darker colors other than lighter colors
Answer:
The time-interval of the collision is 
Explanation:
As given the force is equal to the rate of change of momentum. Mathemticaly this is:
We can rearrange this equation to solve for 
which gives
which is our answer.
In words this means the time interval is equal to the momentum change in that interval divided by the force applied that caused this momentum change.
