If the velocity of a 440 Hz sound is 1,265 ft/s in the air and 5,990 ft/s in seawater, find the wavelength of this sound in (a)
1 answer:
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Answer:
Explanation:
Given
Four Point charges are Placed at the corner of a square with side length a
Length of diagonal
Distance of charge from center
Potential at the center due to four charges is given by
as all the four charges are equal and placed symmetrical about center
Work done required to bring a fifth charge q from infinity to the center of the square
Answer:
The answers to the questions are;
The force the biceps must exert to hold a 850 g ball at the end of the forearm at distance dball = 34.0 cm from the elbow, with the forearm parallel to the floor is 166.77 N Upwards.
The force the elbow must exert is 145.6785 N downwards.
Explanation:
We are required to analyze the system using the principle of moments as follows.
Mass of forearm = 1.30 kg
Weight of forearm = mass × acceleration due to gravity = 1.30 kg × 9.81 m/s²= 12.753 N
Location of point of action of weight of forearm = midpoint 17 cm
Forearm to biceps distance = 3.00 cm from the elbow.
Mass of the ball = 850 g
Weight of ball = mass × acceleration due to gravity = 0.850 kg × 9.81 = 8.3385 N
Position of the ball = end of the forearm
Therefore, taking moment about the elbow, we have
∑Mₓ = 0, we take clockwise moment to be positive, therefore
8.3385 N× 34.0 cm + 12.753 N× 17 cm - ×3.00 cm = 0
Therefore ×3.00 cm = 500.31 N cm
Therefore = (500.31 N·cm)/(3.00 cm) = 166.77 N Upwards
The force exerted by the elbow is given by,
Taking moment about the point of contact between the biceps and the forearm, we get
× 3.00 cm = 8.3385 N× 31.0 cm + 12.753 N× 14 cm
= 145.6785 N downwards.