The activation energy is lowered only
There are more collisions per second and the collisions are of greater energy
There are more collisions per second only
The activation energy is lowered
Answer:
Explanation:
The source of all forms of energy found on the earth except nuclear energy is the sun . So energy used by us to do daily activities also comes from the sun .
The plants trap the solar energy in the form of light to make food material for us like sugar , carbohydrates etc . This energy is stored here in the chemical bonds formed in them.
We take this food in the form of carbohydrate, fat etc. We digest it to mix this food carbohydrate in blood . It is further broken down on being absorbed by the cell in our body . They break them to produce a compound like ATP ( adenocine triphosphate ) which is energy rich compound . It is converted into ADP and difference of energy is released . This energy is used by us in moving body parts.
Answer:
122.2
Explanation:
From the question, the equation of the force acting on the crate is,
F-mg = ma
F = ma+mg ........................ Equation 1
Where F = upward force, m = mass of the crate, a = acceleration of the crate, g = acceleration due to gravity of the crate.
Given: m = 5.0 kg, g = 9.8 m/s²
And a,
a = d²y/dt²
Where,
y(t) = 2.8t+0.61t³
d²y/dt² = 3.66t................... equation 2
when t = 4.0 s.
substitute into equation 2
d²y/dt² = a = 3.66(4)
a = 14.64 m/s²
substitute into equation 1,
F = 5(14.64)+5(9.8)
F = 73.2+49
F = 122.2 N.
Answer:
2.5 Watts.
Explanation:
From the question given above, the following data were obtained:
Mass (m) = 260 Kg
Time (t) = 1 h
Height (g) = 3.5 m
Power (P) =.?
Next, we shall determine the energy. This can be obtained as follow:
Mass (m) = 260 Kg
Height (g) = 3.5 m
Acceleration due to gravity (g) = 10 m/s²
Energy (E) =?
E = mgh
E = 260 × 10 × 3.5
E = 9100 J
Finally, we shall determine the power. This can be obtained as follow:
Time (t) = 1 h = 3600 s
Energy (E) = 9100 J
Power (P) =.?
P = E/t
P = 9100 / 3600
P = 2.5 Watts
Thus, the power is 2.5 Watts.
