A balloon is at a height of 81m and is ascending upwards with a velocity of 12m/s. A body of 2kg weight is dropped from it. If g=10m/s2, the body will reach the surface of the earth in how much time?

During a race, four competitors of the same weight rode identical bicycles for 10 minutes. Which bicycle stopped for a short drink break?

Where does the pattern of the tides come from?

What increases when the frequency of a sound increases

Explain how storm surges can affect human life in Florida. Use complete sentences.

Which sound would be louder? A. a wave with an amplitude of 1.0 B. a wave with an amplitude of 0.1 C. a wave with an amplitude of 0 D. a wave with an amplitude of 0.5

Are microwaves and radio waves faster or slower than other types of electromagnetic energy?

If you dive under-water, you notice an uncomfortable pressure on your eardrums due to the increased pressure. The human eardrum has an area of about 70 mm2 (7*10-5m2), and it can sustain a force of about 7 N without rupturing.

Why cant kinetic energy ever be greater than potential energy

For a stationary observer, when the source of a sound is moving, its pitch appears to change.

Give an example of each simple machine