The person to introduce the idea of an atom was

A: John Dalton

B: Aristotle

C: Democritus

D: Lavosier

When a certain element is excited with electricity, we see three main lines in its emission spectrum: two red lines and one orange line. what would the absorption spectrum of this element look like?

At 3:00 a car passes mile marker 74 as it cruises along the highway. The car then passes mile marker 124 as the clock reads 3:45. How fast was the car moving?

What are the Si prefix values

This planet gets its blue-green color because its atmosphere is full of methane gas and hydrogen. Earth Venus Uranus Neptune

What is momentum in physics

A 15 g turntable is covered with a uniform layer of dry ice that has a mass of 9.0 g. The angular speed of the turntable and dry ice is initially 0.75 rad/s. What is the angular speed of the turntable once all the dry ice has evaporated?

Rainwater was collected in water collectors at thirty different sites near an industrial basin and the amount of acidity (pH level) was measured. The mean and standard deviation of the values are 4.60 and 1.10 respectively.

A hot air balloon is rising straight up at a constant speed of 7 m/s. when the balloon is 12.0 m/s above the ground, a gun fires a pellet straight up from ground level with an initial speed of 30.0 m/s.

The atmosphere is an). O element O molecule O mixture O compound

What is the velocity of the car, in meters per second, just after it hits a 135-kg deer initially running at 10.5 m/s in the same direction? Assume the deer remains on the car.