Answer:
Explanation:
Since energy is conserved:
2
mu
2
=
2
mv
2
+mgh
⇒u
2
=v
2
+2gh
⇒(3)
2
=v
2
+2(9.8)(0.5−0.5cos60)
⇒v=2m/s
When the force on some area is doubled and the area doesn't change,
then the pressure on that area has doubled.
An opera singer breaks a thin glass with only the use of her high frequency voice
That's false. Displacement would be (r2 - r1) .
