Answer:
Explanation:
force of friction = μ mg
= .3 x 62 x 9.8
= 182.28 N
Work done by friction = 182.28 x 4.8
= 874.94 J
Energy loss by skier = 874.94 J
Kinetic energy after he passes the rough patch
= 1/2 x 62 x 6.8² - 874.94
= 1433.44 - 874.94
= 558.5 J
Velocity after crossing the patch v
1/2 x 62 x v² = 558.5
v² = 18
v = 4.2426 m /s
velocity at the bottom
v² = u² + 2gh
= 18 + 2 x 9.8 x 2.5
= 67
v = 8.18 m /s
b ) internal energy generated =
Work done by friction . = 874.94 J
The expansion of the observable universe began <span>with the explosion of a single particle at a definite point in time.</span>
Answer:
Explanation:
Given that,
Initial speed, u = 5 m/s
Final speed, v = 10 m/s
Time, t = 2 s
The radius of the tire of the bike, r = 35 cm
We need to find the angular acceleration of the pebble during those two seconds. It can be calculated as follows.
So, the required angular acceleration of the pebble is equal to .
Answer:
Explanation:
The equation for this is the one for the Law of Momentum Conservation which says that the momentum before the collision of the balls has to be the same after the collision because momentum cannot be created or destroyed. For us in particular:
and filling in:
[(4.0)(6.0) + (2.0)(0)] = [(4.0 + 2.0)v] and
24 + 0 = 6.0v and
24 = 6.0v so
v = 4.0 m/s to the right