Thank you for posting your question here at brainly. Below is the solution:
E = (h * c) / λ
<span>E = h * f </span>
<span>E = (6.626E-34 J*s) * (6.00E14 Hz) </span>
<span>E = 397.5642E-21 Joules </span>
<span>E = 397.5642 zeptoJoules </span>
<h2>
Answer: 15 s</h2>
Explanation:
This is a situation related to vertical motion with constant acceleration, where the equation that will be usefull is:
(1)
Where:
is the final height of the ball (when it reaches the ground)
is the initial height of the ball (is also zero because is thrown from ground)
is the initial velocity of the ball
is the time the ball is in air (on Earth)
is the acceleration due to gravity on Earth
is the acceleration due to gravity on the Moon
Having this clear, let's solve (1) for the Earth:
(2)
(3)
(4)
(5)
(6) This is the initial velocity
Using this same velocity and equation (4) for the Moon:
(7)
Finally finding 
:
Answer:
The answer is μ=1.2
Explanation:
Step one
F=μN
F =friction force
μ =coefficient of friction
N=normal force
Step two
Given
F=12,000N
N= weight of car 10,000N
Step three
Substituting our values in the formula we have
12,000=μ*10,000
μ=12000/10000
μ=1.2
coefficient of friction. A measure of the amount of resistance that a surface exerts on or substances moving over it, equal to the ratio between the maximal frictional force that the surface exerts and the force pushing the object toward the surface.
