What is a supernova?

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?