The airtime is 9.8
the velocity is 0
Answer:
option (b)
Explanation:
According to the Pascal's law
F / A = f / a
Where, F is the force on ram, A be the area of ram, f be the force on plunger and a be the area of plunger.
Diameter of ram, D = 20 cm, R = 20 / 2 = 10 cm
A = π R^2 = π x 100 cm^2
F = 3 tons = 3000 kgf
diameter of plunger, d = 3 cm, r = 1.5 cm
a = π x 2.25 cm^2
Use Pascal's law
3000 / π x 100 = f / π x 2.25
f = 67.5 Kgf
Downward force acting on the ball is 19.6N
Net force acting on the ball is 1960V N
<u>Explanation:</u>
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Given:
Mass of the ball, m = 2kg
Density of ball, σ = 800 kg/m³
Density of water, ρ = 1000 kg/m³
Downward force acting by the ball in the vessel = mg
where, g = 9.8m/s²
F = 2 X 9.8
F = 19.6N
Net force acting on the ball:
Fnet = (ρ - σ) Vg
where,
V is the volume of water
Fnet = (1000 - 800) V X 9.8
Fnet = 1960V N
If the volume is known, then substitute the value of V to find the net force.
Thus, Downward force acting on the ball is 19.6N
Net force acting on the ball is 1960V N
Answer:
47 kg
Explanation:
Momentum = 2209 kg * m/s
velocity = 47 m/s
Mass (m) = ?
We know that momentum is the product of mass and velocity so
Momentum = mass * velocity
2209 = mass * 47
mass = 2209 / 47
mass = 47 kg
Hope it will help :)❤
Answer:
Explanation:
The Doppler effect occurs when a source of waves and/or observer move relative to each other, resulting in the observer measuring a different frequency of the waves than the frequency that the source is emitting.
Let use our case study.
It would be higher pitched when approaching due to the Doppler effect.
The sound waves as you approach them, travel faster relative to you so they pass more frequently which is higher pitched. when you travel away from the source you are out-speeding these waves so they sound slower and thus, lower-pitched.
When a car approaches bus, the sound waves that reach person on the bus have a shorter wavelength and a higher frequency. The person hear a sound with a higher pitch. When the car moves away from bus, the sound waves that reach the person have a longer wavelength and lower frequency. The person hear a sound with a lower pitch.