Answer:
The angular diameter is 77.35 arc-seconds.
Explanation:
The angular diameter, as shown in the figure, is the angle subtended by the the diameter of the object.
Before we do the calculation, we first convert everything to meters.
The diameter of the of the object in meters is
75cm =0.75m,
and the distance to the object in meters is
2 km = 2000 m.
Now, from trigonometry we get:
and since 1 degree = 3600 arc-seconds, in arc-seconds is
Answer:
About 6.26m/s
Explanation:
Divide both sides by mass:
Since the point of equality of kinetic and potential energy will be halfway down the cliff, height will be 4/2=2 meters.
Hope this helps!
Groups are vertical columns in the Periodic Table and they contain elements with similar properties. One characteristic is that each member of a group has the same number of electrons in the outer level. This holds true for groups 1-7. Because each element has the same number of electrons in the outer shell, they tend to have similar properties(second characteristic).
Answer:
400 V
Explanation:
Electric filed , E=800 V/m
We know that
Using the formula
Hence, the potential at x=2 m=400 V
Answer:
Echoes. An echo is a sound that is repeated because the sound waves are reflected back. Sound waves can bounce off smooth, hard objects in the same way as a rubber ball bounces off the ground. Although the direction of the sound changes, the echo sounds the same as the original sound.
Explanation: