Ein Würfel, der innen mit perfekt refflektieren Wänden verkleidet ist, steht auf reibungslosen Oberflächen. Mit einem Laser wird ein kurzer Lichtpuls auf eine der Seitenwände geschickt. Was beobachtet ein auen stehender Beobachter?
Ist es möglich ein Raumschiff allein durch den Sonnenwind anzutreiben?
Which of the following statements are true about momentum? - Momentum is a vector quantity. - The standard unit on momentum is the Joule. - An object with mass will have momentum. - An object which is moving at a constant speed has momentum. - An object can be traveling eastward and slowing down; its momentum is westward. - Momentum is a conserved quantity; the momentum of an object is never changed. - The momentum of an object varies directly with the speed of the object. - Two objects of di erent mass are moving at the same speed; the more massive object will have the greatest momentum. - A less massive object can never have more momentum than a more massive object. - Two identical objects are moving in opposite directions at the same speed. The forward moving object will have the greatest momentum.
Which of the following statements are true about collisions? - Two colliding objects will exert equal forces upon each other even if theirmass is signi cantly different. - During a collision, an object always encounters an impulse and a change in momentum. - During a collision, the impulse which an object experiences is equal to its velocity change. - The velocity change of two respective objects involved in a collision will always be equal. - While individual objects may change their velocity during a collision, the overall or total velocity of the colliding objects is conserved. - In a collision, the two colliding objects could have di erent acceleration values. - In a collision between two objects of identical mass, the acceleration values could be different. - Total momentum is always conserved between any two objects involved in a collision. - When a moving object collides with a stationary object of identical mass, the stationary object encounters the greater collision force. - When a moving object collides with a stationary object of identical mass, the stationary object encounters the greater momentum change. - A moving object collides with a stationary object; the stationary object has significantly less mass. The stationary object encounters the greater collision force. - A moving object collides with a stationary object; the stationary object has significantly less mass. The stationary object encounters the greater momentum change.
