Ultrasounds have sound waves that have frequencies greater than 20,000Hz (20 kHz). This is above the normal hearing range for humans which is why we can not here ultrasounds
Answer:
4400 N
Explanation:
MA = Fout / Fin
8.1 = Fout / 540 N
Fout = 4374 N
Rounding to two significant figures, the force the pulley exerts on the tire is 4400 N.
Answer:
The velocity of Billy is, V = - 2.05 m/s
Explanation:
Given data,
The mass of Sally, m = 45 kg
The mass of Billy, M = 55 kg
Sally's velocity, v = 2.5 m/s
Billy's velocity, V = ?
According to the law of conservation of momentum,
mv + MV = 0
V = - (mv/M)
V = - (45 x 2.5 / 55)
= - 2.05 m/s
Hence, the velocity of Billy is, V = - 2.05 m/s
Answer:
yes
Explanation:
the coloured candle has been added a chemical compound that will lengthen the burning compared to the white candle .In the real world the coloured candle will be a help economically because it will last longer
Answer:
T=189.15 N
Explanation:
As we know that for downward motion
F acting = F (weight) - Tension T
m a = mg - T
⇒ T = m (g - a)
T = 29.1 kg ( 9.8 m/s² - 3.3 m/s²)
T=189.15 N