Answer:
Newton's first law states that, if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.
Newton's second law states that the acceleration of an object is directly related to the net force and inversely related to its mass. Acceleration of an object depends on two things, force and mass.
Newton's third law states that if an object A exerts a force on object B, then object B must exert a force of equal magnitude and opposite direction back on object A. This law represents a certain symmetry in nature: forces always occur in pairs, and one body cannot exert a force on another without experiencing a force itself.
Explanation:
Answer:
371.2 mm
Explanation:
The Balmer series of spectral lines is obtained from the formula
1/λ = R(1/2² -1/n²) where λ = wavelength, R = Rydberg's constant = 1.097 × 10⁷ m⁻¹
when n = 15
1/λ = 1.097 × 10⁷ m⁻¹(1/2² -1/15²)
= 1.097 × 10⁷ m⁻¹(1/4 -1/225)
= 1.097 × 10⁷ m⁻¹(0.25 - 0.0044)
= 1.097 × 10⁷ m⁻¹ 0.245556
= 2.693 10⁶ m⁻¹
So,
λ = 1/2.693 10⁶ m⁻¹
= 0.3712 10⁻⁶ m
= 371.2 mm
Answer:
<em>Fn = 50 N</em>
Explanation:
<u>Net Force</u>
The net force is the sum of all the forces acting on an object.
When all the forces act in a single line, the direction of the forces is given by their signs. Positive signs are assumed to be up and left on both axes.
The box being raised by a force has a weight of W=-125 N. The negative sign indicates the weight points down. The accelerating force goes up and its value is F=175 N. The positive sign indicates this force pushes the box up.
The forces acting on the box are:
The weight W=-125 N
The accelerating force F=175 N
The net force is
Fn = W + F = -125N + 175 N
Fn = 50 N
A part or aspect of something abstract, especially one that is essential or characteristic.
I could be wrong :|
Since you're walking opposite to the motion of the walkway, the speed
that you walk subtracts from the speed of the belt. Relative to the ground
(the floor of the building), your speed is
(3.4 m/s - 1.5 m/s) = 1.9 m/s
To cover the 84-m length of the walkway, it takes you
(84 m) / (1.9 m/s) = 44.2 seconds .
If you had just stood still and gone with the flow, it would have taken
(84 m) / (3.4 m/s) = 24.7 seconds .
Whereas, if you were willing to put forth the extra effort to keep
walking on the walkway, and had walked forward instead of
backward, then you would have moved at (3.4 + 1.5) = 4.9 m/s
relative to the stationary floor, and you would have covered the
full length of the walkway in only
(84 m) / (4.9 m/s) = 17.1 seconds .
In other words, once you jumped onto the walkway, you had
three options:
-- Stand still, for 24.7 seconds;
-- Walk forward, save 7.6 seconds;
-- Walk backwards, lose 19.5 seconds !
Being in a hurry, your decision to walk backwards was the worst choice.
It was not only totally inexplicable, but it also most likely irritated the other
people on the walkway, as they met you and had to all scrunch to one side
to let you go by in reverse.
It's not surprising that you had to hurry to catch your flight, I'm guessing
that you often miss them.
