C. a cello playing music at the concert
In triangle ABC
Sin5 = BC/AC
BC = (AC) Sin5
BC = (50) Sin5 = 4.36 cm
r = distance between the two balls = 2 BC = 2 x 4.36 = 8.72 cm = 0.0872 m
q = charge on each ball
m = mass of each ball = 5 g = 0.005 kg
electric force between the two balls is given as
F =
using equilibrium of force in vertical direction
T Cos5 = mg eq-2
Using equilibrium of force in horizontal direction
T Sin5 = F eq-3
dividing eq-3 by eq-2
T Sin5 /(T Cos5) = F/mg
F = mg tan5
using eq-1
= mg tan5
inserting the values
= 0.005 x 9.8
q = 2.03 x 10⁻⁷ C
sign of charge is same on both the balls. either it is negative or positive
Explanation:
with strict teachers gain evidence if them being bad then report them to the principal.
The speed of the toy train travelling on a circle-shaped track is 2.0 m/sec also called velocity of the train.
<h3>How to find Speed ?</h3>
- Speed is calculated as follows: speed = distance * time. Knowing the units for distance and time is necessary to calculate the units for speed.
- Circular motion is defined as the movement of an object when its distance from the centre remains constant.
- The object is rotating in a circle at a constant speed; therefore, when the direction of motion changes, the velocity changes.
- When a moving object changes direction while maintaining its speed, it experiences a centripetal acceleration (ac), also referred to as a radial acceleration since it acts at right angles to the velocity at any given moment and is directed toward the centre of a circle.
The formula for centripetal acceleration is a = v2 / r, where a stands for acceleration, v for velocity, and r for radius. Rearranging terms:
v = sqrt(ra)
v = sqrt( [0.5 m * 8.0 m/sec^2] )
v = sqrt( 4.0 m^2/sec^2 )
v = 2.0 m/sec
The speed of toy train is 2.0 m/sec
To learn more about Speed refer :
brainly.com/question/4931057
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Answer:
minimum length of a surface crack is 18.3 mm
Explanation:
Given data
plane strain fracture toughness K = 82.4 MPa m1/2
stress σ = 345 MPa
Y = 1
to find out
the minimum length of a surface crack
solution
we will calculate length by this formula
length = 1/π ( K / σ Y)²
put all value
length = 1/π ( K / σ Y)²
length = 1/π ( 82.4 / 345× 1)²
length = 18.3 mm
minimum length of a surface crack is 18.3 mm