The punching bag applies the same amount of force to the boxer’s hand. (C)
Those forces are exactly equal.
Gravity always works as a pair of <em>EQUAL</em> forces ... one in each direction
between two masses. Your weight on the Earth is exactly the same as
the Earth's weight on you.
The orbits of planets being elliptical was one of the planetary laws developed by Johannes Kepler.
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:
461.88 N
Explanation:
The swing is in static equilibrium. T is the tension in the string. Refer to the attached figure.
In the vertical direction:
In the horizontal direction:
Thus, the horizontal force being applied by the partner is 461.88 N.