Answer:
Explanation:
initial velocity, u = 0 m/s
time, t = 8.99 s
final velocity, v = 21.9 m/s
diameter of tyre, D = 57.5 cm
(a) Let a is the acceleration, and n be the number f revolutions made by the tyre.
Use first equation of motion
v = u + at
21.9 = 0 + a x 8.99
a = 2.44 m/s²
Use third equation of motion
v² = u² + 2 a s
21.9 x 21.9 = 0 + 2 x 2.44 x s
s = 98.28 m
Circumference of wheel, S = π x D = 3.14 x 0.575 = 1.8055 m
number of revolutions, n = distance / circumference
n = 98.28 / 1.8055
n = 54.4
MA = (Effort Distance)/(Effort Resistance) = L/H
L = MA * H = 5 * 8" = 40"
Answer:
Mass, m = 4 kg
Explanation:
<u>Given the following data;</u>
Energy = 3.6 * 10^17 Joules
We know that the speed of light is equal to 3 * 10⁸ m/s.
To find the mass of the substance;
The theory of special relativity by Albert Einstein gave birth to one of the most famous equation in science.
The equation illustrates, energy equals mass multiplied by the square of the speed of light.
Mathematically, the theory of special relativity is given by the formula;
Where;
- E is the energy possessed by a substance.
- m is the mass.
- c is the speed of light.
Substituting into the formula, we have;
Mass, m = 4 kg
Answer:
Explanation:
Impossible to say without knowing how high point D is.
If we ignore friction, the energy converted from potential energy will exist as kinetic energy.
let d be the height in meters of point D "in the air"
mg(19 - d) = ½mv²
m is common so divides out
g(19 - d) = ½v²
v = √(2g(19 - d))
no sense in making g any more precise than the height. g = 9.8
v = √(2(9.8)(19 - d))
v = √(19.6(19 - d))
