Answer:
v = 220 m / s
Explanation:
This is a kinematics exercise, the expression for velocity is
v = 25 t² - 80 t - 200
asks the velocity for time t = 6 s.
let's calculate
v = 25 6² - 80 6 - 200
v = 220 m / s
Answer:
D. all organisms grow and decelop
(a)
In a velocity selector, the speed of the beam is related to the magnitude of the electric field and of the magnetic field by the formula:
where
E is the magnitude of the electric field
B is the magnitude of the magnetic field
In this problem, we have
(magnetic field)
(speed of the particles)
Solving the equation for E, we find the electric field:
(b) 3.2 kV
The relationship between electric field and potential difference between the two plates is:
where, in this problem:
is the magnitude of the electric field
is the separation between the plates
Substituting into the equation, we find the potential difference:
Answer:
avriage force F = 2722.5 N
Explanation:
For this problem we can use Newton's second law, to calculate the average force and acceleration we can find it by kinematics.
vf² = v₀² - 2 ax
The final carriage speed is zero (vf = 0)
0 = v₀² - 2ax
a = v₀² / 2x
a = 1.1²/(2 0.200)
a = 3.025 m / s²
a = 3.0 m/s²
We calculate the average force
F = ma
F = 900 3,025
F = 2722.5 N