Who was the man who lived from 460B. C. 370B. C. and was among the first to suggest the idea of atoms?

a. Atomos

c. Democritus

b. Dalton

d. Thomson

For which of these questions could a testable hypothesis be developed? what is the best action movie? which theme park is the most fun? what makes a baseball bounce? where can you find the best ice cream?

Johanna is studying what happens to the energy as a ball rolls down a ramp. What is she studying? Check all that apply. gravitational potential energy electrical energy kinetic energy mechanical energy elastic potential energy

The temperature at 5 p. m. is 20 degree. the temperature at 10 p. m. - 5 degree. how many degrees did the temperature fall

An object with total mass mtotal = 15.9 kg is sitting at rest when it explodes into three pieces. One piece with mass m1 = 4.6 kg moves up and to the left at an angle of θ1 = 20° above the - x axis with a speed of v1 = 28.1 m/s.

How far away is the Sun from the Earth?

Which organisms develop gills from pharyngeal arches and later develop lungs to breathe on land

How much energy (in joules) is required to evaporate 0.0005 kg of liquid ammonia to vapor at the same temperature?

It is 5.5 km from your home to the physics lab. As part of your physical fitness program, you could run that distance at 10 km/h (which uses up energy at the rate of 700 W), or you could walk it leisurely at 3.0 km/h (which uses energy at 290 W).

The largest volcanic structures on venus are called:

a block with a mass of 3 kg is swung on a cord in a horizontal circle with a radius of 2m. the speed of the block is 6m/s^. the magnitude of the acceleration of the block is most nearly