Complete Question
Consider what happens when you jump up in the air. Which of the following is the most accurate statement?
A
Since the ground is stationary, it cannot exert the upward force necessary to propel you into the air. Instead, it is the internal forces of your muscles acting on your body itself that propels your body into the air.
B
You are able to spring up because the earth exerts a force upward on you that is greater than the downward force you exert on the earth.
C
It is the upward force exerted by the ground that pushes you up, but this force cannot exceed your weight.
D
When you jump up the earth exerts a force F1 on you and you exert a force F2 on the earth. You go up because F1 > F2.
E
When you push down on the earth with a force greater than your weight, the earth will push back with the same magnitude force and thus propel you into the air
Answer:
The correct option is E
Explanation:
Generally from Newton law which states that for very action there is an equal and opposite reaction, so when you push down on the earth with a force greater than your weight, the earth will push back with the same magnitude force and thus propel you into the air
Energy of electron in atom level n =
When n = 4
When n = 5
Energy of photon absorbed = -0.544 - (-0.85) = 0.306 eV = 0.489 * J
We also have energy of photon =
Comparing both
So, Energy of photon = 4069 nm
Answer:
Explanation:
As we know that 1 lb fat can be used to expend 4.1 k Calorie of energy
so here we know that we have to use 7.56 lb of body fat
so here the total energy that is to be utilized is given as
so we will have
now we know that runner expends the energy at rate of 1850 kJ/h
so we have
so it is
now we know that time to burn this energy is given as
Answer:
(b) Both are the same
Explanation:
When work is done to change a position or a state of motion, then the potential and kinetic energy are created. Then the energy gets transferred to an object. Its means the work is done.
The work done to change a position of an object is called potential energy while the work done to change a state of motion of an object is called kinetic energy.
We know that the total energy of a system remains constant. It is called the law of conservation of energy.
So, the work done is equal to the amount of PE or KE created. Hence, the correct option is (b).