Answer:1. Find the wavelength in air at 20°C of an ... 19 m. 2. What is the wavelength of an 18-Hz sound wave in seawater at 25°C? ... 3. Find the frequency of a sound wave moving through iron at 25°C with a ... The lowest frequency is. 25. Resonance on Strings A violin sounds a note of F sharp ..
Answer:
294.3 N
Explanation:
In this situation, we are told that the crate is not accelerating in the horizontal plane. But also it is not accelerating in the vertical plane. Meaning that the sum of all vertical forces add up to zero.
Fnet = ma
Weight + Normal force = mass * acceleration
-(30 kg * 9.81 m/s²) + Normal force = 30.0 kg * 0 m/s²
Normal force = 294.3 N
Answer:
Theta
Explanation:
Various emotions of a human being are controlled through communication between neurons. These communication occurs with the help brain waves generated by these neurons. There are various brain waves corresponding to different emotions.
Theta waves are associated with normal sleep. Their frequency lies in the range of 3 Hz to 8 Hz.
Answer:
The resistor to be hooked up must be 9900 
Explanation:
Recall how resistors in parallel combine to render an equivalent resistor:
So we need to find which resistor (R2) we need to combine in parallel with resistor R1 (100 ) in order to obtain an equivalent resistor Re (99 ) :
1 ) F = 100 N; v = 45 m/s;
P = F · v = 100 N · 45 m/s = 4,500 W = 4.5 kW
2 ) m = 50 kg;
W = m · g · h = 50 kg · 9.81 m/s² · 28.3 m · cos 45° = 13,881.15 · 0.71=
= 9,815.45 J
3 ) Ideal mechanical advantage = 5.00 m / 2.00 m = 2.50
4 ) W = F · s
s = 10 · cos 30° = 5 √3
F = 5 · 10^4 N
W = 5 · 10 ^4 N · 5 √3 m = 4.33 · 10^5 J
