Caribbean:
Habana ... Cuba
San Juan ... Puerto Rico
San Jose ... Costa Rica
Other:
Lima ... capital of Peru in South America
Equatorial Guinea ... country in Africa
Answer:
Explanation:
ASSUMING that block = sled AND that the rope is parallel to the slope.
The force acting parallel due to the weight is
13.6(9.81)sin35.5 = 77.475 N
The maximum friction force is
(0.45)13.6(9.81)cos35.5 = 48.877 N
If rope tension is T
77.475 - 48.877 < T < 77.475 + 48.877
28.6 N < T < 126 N
28.6 N will occur if the block is on the verge of sliding downhill
126 N will occur if the block is on the verge of sliding uphill
Could be any value between them.
Answer:
The separation between the two lowest levels =
The values of n where the energy of molecule reaches 1/2 kT at 300K =
The separation at this level = 1.8 * J
Explanation:
Knowing the formula
En =
Mass of oxygen molecule
m (O2) = 32 amu *
So the energy diference between the two lowest levels:
E2 - E1 =
E2 - E1 =
Now we should find n where the energy of molecule reaches 1/2 kT
En = =
=
by the end is necessary to calculate the separation of the level
En - En-1 =
= 1.8 * J
To determine the distance of the light that has traveled given the time it takes to travel that distance, we need a relation that would relate time with distance. In any case, it would be the speed of the motion or specifically the speed of light that is travelling which is given as 3x10^8 meters per second. So, we simply multiply the time to the speed. Before doing so, we need to remember that the units should be homogeneous. We do as follows:
distance = 3x10^8 m/s ( 8.3 min ) ( 60 s / 1 min ) = 1.494x10^11 m
Since we are asked for the distance to be in kilometers, we convert
distance = 1.494x10^11 m ( 1 km / 1000 m) = 149400000 km