When a fluid is heated, what changes occur?

It becomes less dense and begins to rise.

It becomes more dense and begins to rise.

It becomes less dense and begins to sink.

It becomes more dense and begins to sink.

Which of the following describes the least amount of work being done? a batter hitting a baseball or wind turning a windmill or a ball hanging from a tall pole or steam turning a turbine

an audio CD has a diameter of 120 mm and spins at up to 540 rpm. When a CD is spinning at its maximum rate, how much time is required for one revolution? Of a speck of dust rides on the outside edge of the disk,

What the charges of the nucleus

Which has more momentum? A paper airplane with a mass of 10g flying at a velocity of 4m/s or a real airplane that is parked at a runway with a mass of 1000kg and a velocity of 0m/s

A sound that measures 30 decibels is how many times louder than the human threshold of hearing

After creating a question and forming a hypothesis, what is the next step in the scientific method

Roger sees water balloons fall past his window. He notices that each balloon strikes the sidewalk 0.51 s after passing his window. Roger's room is on the second floor, 10 m above the sidewalk.

Which statements accurately describe the Doppler effect?

Describe how mass and distance affect gravitational force.

a bike can climb the inclined road at uniform speed of 72 km/hr by applying force 500N what will be the power applied by the bike?