Answer:
Blue is reflected and pink is absorbed
Explanation:
Reflection involves the wave bouncing back from the surface while absorption involves the wave passing through the surface.
Answer:
30000 J = 30 kJ
Explanation:
Kinetic energy is the energy possessed by a moving object solely due to its motion.
You can get the K.E. of an object using the equation,
K.E. =
So you get,
K.E. =
= 30000 J = 30 kJ
distance between sun and earth is 1 AU
now 1 light year is defined as distance covered by light in one year
so we will have
So 1 Ly is more than the distance between sun and earth
Answer:
the bell has potential energy equal to,
18 x 9.8 x 45 = 7938 joules
Answer:
m = 3.57
Explanation:
Given that,
Sergei uses a lever to lift a heavy rock. He obtains a 2.5m lever and places the fulcrum 0.7m from the rock.
We need to find the ideal mechanical advantage of Sergei's lever.
It is equal to the ratio of resistance arm to the effort arm. In terms of length it is given by :
So, the ideal mechanical advantage of the lever is 3.57.