2. An 800-g bird has 47.0 J of gravitational potential

energy when it is perched high up in a tree.

Calculate the bird's vertical height from the ground.

If an object is said to be moving at 10 m/s due north. The measurement 10 m/s north would be best described as A) a speed. B) a velocity. C) neither a speed or velocity D) either a speed or a velocity.

A person pushes a box from left to right and then lets the box slide freely across the floor. The box slows down as it slides across the floor. When the box is sliding freely, what is the direction of the net external force? Why?

Whenever you watch a high-flying aircraft overhead, it seems that its sound comes from behind the craft rather than from where you see it. Why is this?

What type of volcano forms when there is a series of violent and gentle eruptions resulting in layering of lava and ash? a) cinder b) composite cone volcano c) shield volcano d) hot smoker volcano

Is an object in a free fall when no force but gravity acts on it?

A weather balloon is inflated to a volume of 2.2 x 10^3 L with 374 g of helium. What is the density of helium in grams per liter?

What is the result of a mutation during replication A: the strands are different B: the strands are identical c: the strands are broken D: the strands are continuous

What is ___ heating of a liquid__ gas to liquid

A gate in an irrigation canal is constructed in the form of a trapezoid 2 m wide at the bottom, 38 m wide at the top, and 2 m high. It is placed vertically in the canal so that the water just covers the gate.

A machine with a mechanical advantage of 10 is used to produce an output force of 250 newtons. What input force is applied to this machine