Answer:
the energy when it reaches the ground is equal to the energy when the spring is compressed.
Explanation:
For this comparison let's use the conservation of energy theorem.
Starting point. Compressed spring
Em₀ = K_e = ½ k x²
Final point. When the box hits the ground
Em_f = K = ½ m v²
since friction is zero, energy is conserved
Em₀ = Em_f
1 / 2k x² = ½ m v²
v = x
Therefore, the energy when it reaches the ground is equal to the energy when the spring is compressed.
Answer:
-1.19 m
Explanation:
R1 = + 4 cm
R2 = - 15 cm
n = 1.5
distance of object, u = - 1 m
let the focal length of the lens is f and the distance of image is v.
use lens makers formula to find the focal length of the lens
By substituting the values, we get
.... (1)
By using the lens equation
from equation (1)
v = -1.19 m
A.) the nail
Energy is passed through
Answer:
D Any of the above depending on the directions of forces.
Explanation:
The net force on the box depends on the direction of the forces.
For example, we have three special cases:
- If the two forces are in the same direction, they add to each other, so the net force is
F = 10 N + 10 N = 20 N
- If the two forces are in opposite directions, the net force is given by the difference between the two forces, so
F = 10 N - 10 N = 0 N
- If the two forces are perpendicular to each other, their resultant is given by the Pythagorean theorem:
If the two forces are at any other angle, their resultant can be found by resolving each force along the x- and y- direction, and adding the components along each direction. The resultant net force will have a magnitude between 0 N and 20 N.
<h2>
The momentum is greater for 0.1 kg bullet traveling at 300 m/s</h2>
Explanation:
Momentum = Mass x Velocity.
A 2500 kg truck moving at 0.01 m/s
Momentum = Mass x Velocity
Momentum = 2500 x 0.01 = 25 kgm/s
A 0.1 kg bullet traveling at 300 m/s
Momentum = Mass x Velocity
Momentum = 0.1 x 300 = 30kgm/s
Momentum of 0.1 kg bullet traveling at 300 m/s > Momentum of 2500 kg truck moving at 0.01 m/s.
The momentum is greater for 0.1 kg bullet traveling at 300 m/s