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?

Jack and jill exercise in a 25.0-m-long swimming pool. Jack swims nine lengths of the pool in 157.9 seconds (2 minutes and 37.9 seconds), while jill, the faster swimmer, covers ten lengths in the same time interval.

What does "frontogenesis" mean when used in connection with a weather map?

A ray of light passes from air into a block of clear plastic. How does the angle of incidence in the air compare to the angle of refraction in the plastic?

If you double the frequency of a pendulum what happens to the period Of one cycle ?

A box contains about 5.64 x 1021 hydrogen atoms at room temperature 21°C. Find the thermal energy of these atoms. Answer in units of J.

A cannon directed straight upward launches a ball with an initial speed v. The ball reaches a maximum height h in a time t. Then, the same cannon is used to launch a second ball straight upward at a speed 2v.

Does the sun fuse hydrogen into helium or vice versa?

Is it possible to put a distance versus time graph to be universal go mine

On very dry days, when you use a comb or a brush, your hair sometimes stands on the end and maybe even sticks to the comb or brush. Explain why this happens in terms of electric charge.

A large balloon is initially filled to a volume of 1.96 l at 318.44 k and a pressure of 2.89 atm. what volume of gas will the balloon contain at 1.77 atm and 336.33 k?