the net force on the climber is 495 n acting downwards direction.
the forces acting on the climber are:tension = 455 ngravity = mass × acceleration due to gravity = 95 kg × 10 m/s² = 950 kg-m/s²
now, the net force on the climber = gravity - tension
= 950 n - 455 n
= 495 n
(this force acts downwards as the force of gravity acts downwards)
no, greenhouse gases in the air, mainly carbon dioxide, methane and water vapor, trap radiation from the sun and act like a thermal blanket around the planet. without the greenhouse effect, the earth would have an average temperature of -18 °c and be covered in ice. life as we know it would not be able to survive.
to solve this problem we start from the premise that energy is conserved. this means that the energy that the skier has at the beginning of the slope is equal to the energy he has at the end of the slope.
when the skier is at the top of the slope (point 1) his kinetic energy is minimal and his potential energy is maximum. let's call to the energy in point 1.
mgh = potential energy
when the skier is at the lowest point of the slope (point 2) his kinetic energy is maximum and his potential energy is minimal. let's call the energy in point 2.
= kinetic energy
= energy lost by friction
by the law of conservation of energy we know that:
m = 40kg
v = 10 m/s
h = 12 m
g = 9.8