Answer:
0.5
Explanation:
20000g to kg = = 20 kg
f = ma
a =
a =
a =
a = 0.5
What is the smallest, most basic level of organization in an animal or plant?
1 answer:
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Answer:
B. An isothermal compression of an ideal gas.
Explanation:
The internal energy of an ideal gas is just function of the temperature; it does not matter what other thermodynamic property changes, if the temperature does not change, the internal energy neither does. That is just for ideal gases; real gases behaviour is not like that. All of the other options bring with them an increase or decrease of the temperature:
For A, the temperature will decrease because the gas will do work as it expands, converting part of his internal energy to work.
For C, the temperature will increase, because given , if the volume increases (expansion) and the pressure is constant, the temperature must increase to satisfy the equation.
Answer:
v = 8.03 m / s
Explanation:
This is a missile throwing exercise.
y = y₀ + t - ½ g t²
indicates that y = -1.2 m and the initial velocity is
v_{oy} = v₀ sin θ
v_{oy} = 6.4 sin 2.2
v_{oy} = 0.2457 m / s
we substitute in the equation
-1.2 = 0.2457 t - ½ 9.8 t²
4.9 t² - 0.2457 t - 1.2 = 0
t² - 0.05014 t -0.2449 = 0
we solve the quadratic equation
t = [0.05014 ±√ (0.05014² + 4 0.2449)] / 2
t = [0.05014 ± 0.9910] / 2
t₁ = 0.5206 s
t₂ = -0.47 s
time must be a positive magnitude therefore the correct answer is
t = 0.5206 s
with this time we can calculate the vertical speed when the rock hits the ground
v_{y} = v_{oy} - gt
v_{y} = 0.2457 - 9.8 0.5206
v_{y} = -4.856 m / s
the negative sign indicates that the speed is down
horizontal velocity is constant, due to no acceleration
vₓ = v₀ₓ = v₀ cos 2,2
v₀ₓ = 6.4 cos 2.2
v₀ₓ = 6.395 m / s
therefore let's use Pythagoras' theorem to find the velocity
v = √ (vₓ² + )
v = √ (6,395² + 4,856²)
v = 8.03 m / s
the direction can be found with trigonometry
tan θ = v_{y} / vₓ
θ = tan⁻¹ (-4,856 / 6,395)
θ = - 37
the negative sign indicates that it is half clockwise from the x axis