Pressure, Winds, Storms, and Cyclones

Ritwik is buying a new school bag. He picks one with thin, string-like straps, saying it will feel lighter on his shoulders because thin straps weigh less. Kirti says a bag with broad, padded straps will feel more comfortable, even though the bag and books weigh the same. Who is right?

On a school trip to a dam, Shalini notices that the concrete wall is much thicker at the bottom than at the top. She says it is built that way because water pushes harder the deeper you go. Tushar says water pushes equally at every depth, and the wide base is only there to keep the wall steady, like a pyramid. Who has it right?

On a sunny afternoon at Chennai's Marina Beach, Harleen feels a cool breeze blowing in from the sea. She says it happens because the land heats up faster than the sea: the hot air above the land rises, the pressure there drops, and cooler air from over the sea moves in to take its place. Devansh says the wind should blow from the land out to sea in the afternoon, because the hot land pushes its hot air outward. Whose explanation matches the breeze Harleen feels?

During a cyclone warning, Kush's family is sheltering indoors. After hours of howling wind and rain, everything suddenly goes calm, and the sky even brightens a little. Kush's grandmother says everyone must stay inside until the authorities announce that it is safe. Kush says the cyclone is clearly over and wants to go out to look at the damage. Who should the family listen to?

Two houses have identical pipes and identical taps on the ground floor. One house has a tall, narrow water tank on its roof; the other has a short, wide tank that holds far more water, but its water surface sits lower than the tall tank's. Neelam says water will gush out harder from the tap fed by the tall, narrow tank. Aakash says it will be the wide tank's tap, because that tank holds more water, and more water means more pressure. Whose prediction is correct?

After a cyclone hit the Odisha coast, the news showed tin roofs torn off houses. Lokesh says strong wind blows sideways, so it can only push a roof sideways, never lift it up — those roofs must simply have been loosely nailed. Anusha says fast wind blowing over a roof really can lift it upward. Who is right?