Answer:
64.1°C
Explanation:
mass of automobile, M = 1500 kg
velocity, v = 35 m/s
mass of each brake, m = 8 kg
specific heat of iron, c = 448 J/kg°C
According to the conservation of energy
the kinetic energy of automobile = thermal energy of brakes
0.5 Mv² = 4 x m x c x ΔT
where, ΔT is the rise in temperature of the brake
0.5 x 1500 x 35 x 35 = 4 x 8 x 448 x ΔT
ΔT = 64.1°C
Thus, the change in temperature of each brake is 64.1°C.
Answer:
w =3416 rad/min
Explanation:
The angular speed of the wheels in radians can be defined as follows:
![w=\frac{s}{r}](https://tex.z-dn.net/?f=w%3D%5Cfrac%7Bs%7D%7Br%7D)
where
w = angular speed
r = radius of the wheel
s =distance traveled per minute
in this case we have
r = 34/2 inches = 17 inches
s = (55 mi/hr) (5280 ft/mi) (12 in/ft) (1hr/60min) = 58,080 inches/min
Therefore, w = 58,080/ 17 = 3416 rad/min
Answer:
v = 2.94 m/s
Explanation:
Given that,
Mass of anvil, m = 15 kg
The gravitational potential energy relative to the floor, P = 65 J
We need to find the speed just before it hits the floor when the Anvil is released. Let it is v.
We can use the conservation of energy.
![\dfrac{1}{2}mv^2=mgh\\\\65=\dfrac{1}{2}mv^2\\\\v=\sqrt{\dfrac{65\times 2}{15}} \\\\v=2.94\ m/s](https://tex.z-dn.net/?f=%5Cdfrac%7B1%7D%7B2%7Dmv%5E2%3Dmgh%5C%5C%5C%5C65%3D%5Cdfrac%7B1%7D%7B2%7Dmv%5E2%5C%5C%5C%5Cv%3D%5Csqrt%7B%5Cdfrac%7B65%5Ctimes%202%7D%7B15%7D%7D%20%5C%5C%5C%5Cv%3D2.94%5C%20m%2Fs)
So, the required speed is 2.94 m/s.
Answer:
Get many people interested in doing it and make many people think that this is one of the best sports.
Explanation:
Seasons are largely due to factors surrounding the Earth's tilted axis as it revolves around the sun. A season is a period of the year that is distinguished by special climate conditions.