Answer:
Ke=electron kinetic energy=
Explanation:
The electron has a mass of 
The speed of light in a vacuum is a universal constant with the value 299 792 458 m / s (186 282,397 miles / s), although it is usually close to 
Kinetic energy (K) is the energy associated with bodies that are in motion, depends on the mass and speed of the body and is calculated using the formula:
Equation(1)
K=kinetic energy (J)
m =mass of the body (kg)
v= speed of the body
for this problem We replace in the equation (1)
= electron mass
=Half the speed of light
=electron speed
We replace in the equation (1) :
The energy kinetic of the electron is 
Explanation:
Ummm i think a timer or clock?
The thin atmosphere of Mars is thought to be due to the planet's lack of a magnetic field, which has allowed the Solar wind to blow away much of the gas the planet once had. Venus, despite still having a thick atmosphere of CO2, surprisingly has a similar problem
Answer:
Explanation:
consider the principle of moment
when a system is in equilibrium, the clockwise moment (torque) about the pivot is equal to the counterclockwise moment ( torque). Since the plank is uniform the weight of the plank act at the middle which = 6.1 m / 2 = 3.05 m
the distance that can support the weight of the man = d
mass of the man = 70
70 × d = 33 × ( 3.05 - 1.6)
d = 47.85 / 60 = 0.798 m, if the man work beyond this point he will fall.
Answer:
23.52 N
Explanation:
Using the Hydraulic Press formula
since the the liquid in an hydraulic press cannot be compressed
P₁ ( pressure at the piston 1) = P₂ ( pressure at piston 2)
P₁ = F₁ / A₁ where F₁ represent the weight of the car and F₂ represent the force applied at the 1 cm end and A₁ and A₂ are the area of the piston respectively
P₂ = F₂ / A₂
F₁ / A₁ = F₂ / A₂
(F₁/A₁) × A₂ = F₂
F₁ = 1500 kg × 9.8 m/s² = 14700 N
A₁ = πR² = π ( 0.25)² where R = 25 cm = 0.25 m for the larger piston
A₂ = πr² = π ( 0.01)² where r = 1 cm = 0.01 m
(F₁/A₁) × A₂ = F₂
F₂ = ( 14700 N / ( π 0.0625)) ×π (0.01)² = 23.52 N
