Answer: 1,2,3,4,6 are all correct
Explanation:
i just took the test and got them all right
Answer:
True.
Explanation:
If the sum of the external forces on an object is zero, then the sum of the external torques on it must also be zero.
The net external force and the net external torque acting on the object have to be zero for an object to be in mechanical equilibrium.
Hence, the given statement is true.
Answer:

Explanation:
From the attached diagram below:
AC = a (1 + e) = R₂ -------- equation (1)
CD = a ( 1 - e) = R₁ --------- equation (2)
⇒ 1 - e = 

Replacing the value for e into equation (1)



From Kepler's third law;



Answer:
An arch in a memorial park, having a parabolic shape, has a height of 25 feet and a base width of 30 feet.
Upside down if its further than 1 focal point you have seen this with a spoon and enlarged right side up if closer than 1 focal point