Grade upto college level Mechanics

Although parachutes are supposed to slow your fall, they are often designed with a hole at the top. Explain why.

1 Answer

Parachutes slow down by trapping air underneath. The pressure of the air increases as the air is trapped inside a parachute. The excess pressure inside the parachute escapes under the edges of the parachute. Due to it, the parachute would oscillate violently. Sometimes, the parachute might collapse due to the large excess pressure.
If a hole is provided at the top of the parachute, the excess pressure would escape through the hole. This prevents the parachute from oscillation and allows it to land safely.

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mechanics

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Last Activity: 3 Months ago

Find the value of K if work done is zero for the force
F= =2i+5j and displacement
d = si-Kİ (Kis positive

mechanics

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Last Activity: 6 Months ago

Three identical balls are placed on a frictionless horizontal surface touching each other. They stick to each other because of adhesive. Another ball of same radius and mass m is placed over the void created by the three balls. Find the forces applied by the balls kept on the floor to each other if the system remains in equilibrium.

mechanics

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Last Activity: 1 Year ago

A car loaded with water having total mass 1000 kg moves on a straight horizontal Road starting from rest under the action of a force of 100 Newton. The water spills throw a small hole in the bottom at a rate of 0.1 KG per second the velocity of cart after 300 seconds is nearly.

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mechanics

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Last Activity: 1 Year ago

A metal strip clamped at one end vibrates with a frequency of 20 Hz and amplitude of 5 mm
at the free end, where a small mass of 2 g is positioned. determine
(i) The velocity of the end when passing through the zero position
(ii) The acceleration at maximum displacement
(iii) The maximum kinetic energy of the mass

mechanics

2 Answers Available

Last Activity: 3 Years ago

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Although parachutes are supposed to slow your fall, they are often designed with a hole at the top. Explain why.

Shane Macguire

1 Answer

Deepak Patra

O
│
/ |
/ |
/θ |
●----+
r

Find the value of K if work done is zero for the force
F= =2i+5j and displacement
d = si-Kİ (Kis positive

A car loaded with water having total mass 1000 kg moves on a straight horizontal Road starting from rest under the action of a force of 100 Newton. The water spills throw a small hole in the bottom at a rate of 0.1 KG per second the velocity of cart after 300 seconds is nearly.

11
21
31
41

Although parachutes are supposed to slow your fall, they are often designed with a hole at the top. Explain why.

Shane Macguire

1 Answer

Deepak Patra

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