Answer:
-2250 N
Explanation:
From the question,
Using.
F = m(v-u)/t .................. Equation 1
Where F = Average force the bat apply to the ball, m = mass of the ball, v = final velocity of the ball, u = initial velocity of the ball, t = time.
Given: m = 0.15 kg, v = -50 m/s(reversed direction), u = 40 m/s, t = 6.0×10⁻³ s = 0.006 s.
Substitute into equation 1
F = 0.15(-50-40)/0.006
F = 0.15(-90)/0.006
F = -2250 N.
The force is negative because it opposes the initial motion of the ball.
Hence the bat average force = -2250 N
Answer:
Explanation:
The electric field is generated by a charge and represents the force exerted on a test charge, that is, the electric force per unit of charge. Therefore the equation for the electric field can be obtained from Coulomb's law.
Answer: 15.6 metres
Explanation:
Given that:
length of wave (λ)= ?
Frequency of wave F = 28 Hertz
Speed of wave (V) = 437 m/s
The wavelength is the distance covered by the wave in one complete cycle. It is measured in metres, and represented by the symbol λ.
So, apply V = F λ
Make λ the subject formula
λ = V / F
λ = 437 m/s / 28 Hertz
λ = 15.6 m
Thus, the length of the wave is 15.6 metres
Answer:
a)
b)
c)
Explanation:
Given that
Length =L
Mass = m
Force on elemental part
dF= dm ω² r
dm = m/L dr
dF= ω² r m/L dr
By integrating from r to L
Velocity V