Question

Question 21 1 pts The direction of the buoyancy force on a rock that sits on the bottom of a lake is down. up. zero. There is no buoyancy force when the rock is on the bottom. impossible to determine. Question 22 3 pts When an object is falling in air at terminal velocity, (choose all correct answers) the net force on the object is down. the net force on the object is zero. the net force on the object is up. there is no gravitational force on the object. there is a gravitational force on the object up. there is a gravitational vorce on the object down. the velocity is decreasing. the velocity is increasing. the velocity is constant.

Answer 1

Answer

Q.21

Second option is the correct answer.

Buoyant force is acting up

Buoyancy is the upward thrust exerted on to the object by the water. It depends on volume of object, density of water and g

instead of rock , have a block of wood or plastic to the bottom and then leave it. It will come up due to the buoyant force acting on it.

Q.22

THe correct options are (sequence wise )

2. the net force on the object is zero

6. there is a gravitational force on the object down

9. the velocity is constant