Answer:
23 m/s
Explanation:
First, find the time it takes for the car to fall 40 meters.
y = y₀ + v₀ t + ½ at²
0 = 40 + (0) t + ½ (-9.8) t²
0 = 40 − 4.9 t²
t = 2.89 s
Next, find the velocity needed to travel 65 meters in that time.
x = x₀ + v₀ t + ½ at²
65 = 0 + v₀ (2.89) + ½ (0) (2.89)²
v₀ = 22.75 m/s
Rounding to two significant figures, the car's initial speed was 23 m/s.
Answer: Potential Energy: PE = m x g x h Mass: m = PE / (g x h) Acceleration of Gravity: g = PE / (m x h) Height: h = PE / (m x g) Where, m = Mass, g = Acceleration of Gravity h = Height Gravitational Acceleration of the earth is 9.8 m/sec2.
Explanation:
Answer:
Collision theory is used to predict the rates of chemical reactions, particularly for gases. It is based on the assumption that for a reaction to occur for the reacting species (atoms or molecules) must come together or collide with one another. Not all collisions, however, bring about chemical change.
If two molecules collide with sufficient activation energy, there is no guarantee that the collision will be successful. In fact, the collision theory says that not every collision is successful, even if molecules are moving with enough energy. The reason for this is because molecules also need to collide with the right orientation so that the proper atoms line up with one another, and bonds can break and re-form necessarily.
Shifting patterns of precipitation and increasing dryness will most likely lead to drought in these parts of the United States. Severe drought will adversely affect agriculture and will cause shortages in domestic water supplies. The increasing dryness will also increase the susceptibility of wild fires in this region. Wild fires threaten indigenous species, agriculture, property and human lives.
Answer:
Electricity is defined as the flow of electric currents or charges along or through a conductor.