Download presentation

Presentation is loading. Please wait.

Published byColt Rhoad Modified over 3 years ago

1
In order to help an isolated village, a stationary helicopter releases boxes of food supplies from a height h A = 50 m. Each box is provided with a parachute. The set (S) [box, parachute] has a mass M = 50 kg. (S), released at A without initial velocity (V A = 0), moves down along the vertical trajectory ABC and reaches B, of height h B = 45 m, with a speed V B = 10 m/s. 1) All the forces of friction are neglected while falling from A to B.The mechanical energy of (S) is conserved along the path from A to B. Why? P.E reference Mechanical energy is conserved because no friction along AB. 2) Specify the transformation of energy that takes place while falling from A to B. As it starts to fall the potential energy begins to be transformed into kinetic energy.

2
In order to help an isolated village, a stationary helicopter releases boxes of food supplies from a height h A = 50 m. Each box is provided with a parachute. The set (S) [box, parachute] has a mass M = 50 kg. (S), released at A without initial velocity (V A = 0), moves down along the vertical trajectory ABC and reaches B, of height h B = 45 m, with a speed V B = 10 m/s. 3) Upon reaching B, the parachute opens and the set (S) continues its fall at a constant speed of 10m/s until it reaches C (V C =10 m/s). Find the decrease in the mechanical energy of (S) when it passes from B to C.

3
In order to help an isolated village, a stationary helicopter releases boxes of food supplies from a height h A = 50 m. Each box is provided with a parachute. The set (S) [box, parachute] has a mass M = 50 kg. (S), released at A without initial velocity (V A = 0), moves down along the vertical trajectory ABC and reaches B, of height h B = 45 m, with a speed V B = 10 m/s. 4) How does this loss of energy appear? It appears in the form of heat energy (thermal heat) 4) One of the parachutes did not open while falling from A to C. Determine, in this case, the speed with which this box reaches C. Mechanical energy is conserved because no friction along BC then :

4
5- What can you conclude about the role of the parachute in the fall of the box? The parachute reduces the speed of the box upon impact with the ground.

Similar presentations

OK

Section 6-3 Gravitational Potential Energy. Warm-Up #1 A sailboat is moving at a constant velocity. Is work being done by a net external force acting.

Section 6-3 Gravitational Potential Energy. Warm-Up #1 A sailboat is moving at a constant velocity. Is work being done by a net external force acting.

© 2018 SlidePlayer.com Inc.

All rights reserved.

To ensure the functioning of the site, we use **cookies**. We share information about your activities on the site with our partners and Google partners: social networks and companies engaged in advertising and web analytics. For more information, see the Privacy Policy and Google Privacy & Terms.
Your consent to our cookies if you continue to use this website.

Ads by Google

Ppt on forest resources in india Ppt on programmable logic array application Ppt on peer pressure Ppt on power system stability definition Ppt on behaviour of seismic waves Ppt on forward rate agreement definition Ppt on review of literature paper Ppt on service oriented architecture Ppt on 2nd world war date Ppt on population census 2011 data