Answer:
(4273.7 - 3281.6 )
Explanation:
= initial velocity of the baseball before collision = 43 m/s
= final velocity of the baseball after collision = 56 m/s
m = mass of the ball = 145 g = 0.145 kg
t = time of contact of the ball with the bat = 1.90 ms = 0.0019 s
= Average force vector
Using Impulse-change in momentum equation
t = m ( - )
(0.0019) = (0.145) (56 - 43 )
= (4273.7 - 3281.6 )
Answer:
60 J
Explanation:
Potential Energy: This can be defined as the energy possessed by a body, due to its position. The S.I unit of potential energy is Joules. The Formula of potential energy is given as
Ep = mgh or
Ep = Wh ................ Equation 1
Where Ep = Potential energy of the box, W = Weight of the box, h = Height.
Given: W = 20 N, h = 3 m.
Substitute into equation 1
Ep = 20×3
Ep = 60 J.
Hence the gravitational potential energy of the box = 60 J
The answer is d. I hope that helps.
Answer:
r = 6.5*10^-3 m
Explanation:
I'm assuming you meant to ask the diameters of the disk, if so, here's it
Given
Quantity of charge on electron, Q = 1.4*10^9
Electric field strength, e = 1.9*10^5
q = Q * 1.6*10^-19
q = 2.24*10^-10
E = q/ε(0)A, making A the subject of formula, we have
A = q / [E * ε(0)], where
ε(0) = 8.85*10^-12
A = 2.24*10^-10 / (1.9*10^5 * 8.85*10^-12)
A = 2.24*10^-10 / 1.6815*10^-6
A = 1.33*10^-4 m²
Remember A = πr²
1.33*10^-4 = 3.142 * r²
r² = 1.33*10^-4 / 3.142
r² = 4.23*10^-5
r = 6.5*10^-3 m
<span>When placing each domino upright, potential energy is conserved in that domino. When kinetic energy is initially added into the first domino, this energy converts the next domino's potential energy to kinetic energy, which is transferred to the next domino afterwards. Hope this helps ;3</span>