Scientists develop knowledge by making about the natural world that may lead to a scientific question. A scientific question may lead to a (n), which can be tested. The results of can lead to changes in scientific knowledge.

the average velocity of a duck is zero as it goes from t=0 to t=120 s. describe the displacement of the duck for that interval

Students repeat the experiment but replace block X and block Y with block W and block Z, as shown in Figure 3. Block W and block Z have identical mass M.

60 kilometers in 4 hours, what is the average speed?

The energy value of a raw peach is reported as a number of

Suppose you mix food coloring in water to make it blue. Have you made a solution or a suspension?

An object has a mass of 8.00 kg. What is the gravitational force on the object by the earth?

Which of the following best characterizes the free energy change ΔG for an endothermic reaction under physiological conditions? A. The sign of ΔG is positive B. The sign of ΔG is zero C. The sign of ΔG is negative D.

In a recent hockey game, one player (m=100kg) was moving at a velocity of 8 m/s when he ran into another player (m=300kg) who was at rest (v=0m/s). After the collision, the two players were stuck together (moving with the same velocity).

In a laser, electrical energy is changed to light energy, and a small amount of the energy is wasted as heat. Describe the total amount of the heat in the system (using the conservation of energy).

What is the name for a star and planets held together by gravity? A. solar system B. galaxy C. black hole D. supernova