How many stairs?
You can use this to find the work
U
W=mgh
And the power by
P=W/T
KE depends on speed-squared.
So if speed doubles, KE grows x4.
It'll be 400 J .
Answer:
4.96cm
Explanation:
distance = 5.20km = 5.2 × 10³ m
Wavelength , λ = 550nm = 5.50 × 10⁻⁷m
distance of moon, L = 384000 km = 3.84 × 10⁸m
formula for resolving power of two objects
d = (1.22 × λ ×L) / D
D = (1.22 × λ ×L) / d
= (1.22 × 5.50 × 10⁻⁷ ×3.84 × 10⁸) / 5.2 × 10³
D = 4.96cm
Answer:
The net force on the box is 2 N to the left.
The box will move to the left.
The acceleration on the box is 0.5 m/s^2 to the left.
Explanation:
Let's say movement to the right is positive and left is negative.
Bob: +10 N
John: -12 N
Add those together and you get a net force of -2 N, and the negative sign means that the box is moving to the left.
For the acceleration:
Fnet = ma
-2 = (4 kg)a
a = -0.5 m/s^2
Again, the negative sign in this answer means the box is being accelerated to the left.
False, because the force between two charged objects decreases as distance between them increases, as per the universal magnetic force law:
F = kq1q2 / r^2, where F is the force, r is the distance between the objects, k is the universal magnetic constant, and q1 and q2 are the unit charge per unit mass values,