When strong/high-speed wind blows, an umbrella held upright at times gets upturned. Explain the reason.

Academic Physics NCERT Class 7

A high-speed wind or storm creates low pressure above the umbrella, so the umbrella gets upturned.

Tutorialspoint

Updated on: 10-Oct-2022

18 Views

Nights in desserts are much cooler because(a) humidity becomes high(b) sand cools down faster(c) wind blows vigorously(d) it rains at night
How does high wind come from low pressure and low wind from high pressure?
In the wind energy farms, the wind speed should be higher than __________ to maintain the required speed of the turbine.
Explain the following properties:i) ($-$a1) $\times$ ($-$a2) $\times$ ($-$a3) $\times$ ... $\times$ ($-$an) = $-$ (a1 $\times$ a2 $\times$ a3 $\times$ ... $\times$ an), when n is odd.ii) ($-$a1) $\times$ ($-$a2) $\times$ ($-$a3) $\times$ ... $\times$ ($-$an) = (a1 $\times$ a2 $\times$ a3 $\times$ ... $\times$ an), when n is even.iii) ($-$a) $\times$ ($-$a) $\times$ ($-$a) $\times$ ... n times = $-$ an, when n is odd. iv) (-$a) $\times$ ($-$a) $\times$ ($-$a) $\times$ ... n times = an, when n is even. v) ($-$1) $\times$ ($-$1) $\times$ ($-$1) $\times$ ... n times = $-$ 1, when n is odd.v) ($-$1) $\times$ ($-$1) $\times$ ($-$1) $\times$ ... n times = 1, when n is even.
When an electric bulb gets heated to a very large high temperature, in which color it turns to?
Explain how the wind is produced?
Light travels at a speed much faster than sound. Give reason.
A star at times appears bright and at times fainter. What is this effect called? State the reason for this effect.
What should be the minimum wind speed for the satisfactory working of a wind-powered electric generator?
Explain why, when a burning candle is covered with an inverted gas jar, the candle gets extinguished after sometime.
When the speed of an object can be zero?
Newly formed DNA copies may not be identical at times. Give reason.
A curtain is hanging at the entrance of a room. A long corridor runs at right angles to the door, that is parallel to the curtain. If a strong wind blows along the corridor, the curtain will$(a)$. get pushed inside the room.$(b)$. get pushed outside the room.$(c)$. get collected towards one end/swirled.$(d)$. remain unaffected.
Fill in the blanks.$(i)$. Air around us exerts____.$(ii)$. The moving air is called_____.$(iii)$. The main cause of wind movement is uneven ____ on the earth.$(iv)$. High speed wind can cause cyclone in regions of _____pressure.
An umbrella has 8 ribs which are equally spaced (see figure). Assuming umbrella to be a flat circle of radius 45 cm, find the area between the two consecutive ribs of the umbrella."

Kickstart Your Career

Get certified by completing the course

Get Started

Advertisements