Answer True or False. 1. In motion means moving. 2. Scientists do not use a frame of reference to talk about motion. 3. You cannot tell whether an object is in motion unless you have frame of reference. 4. A frame of reference is some other object to which you compar an object's position. 5. When scientists study the motion of stars in the sky, they use clouds as a frame of reference.

- Cuál es el área mínima de un bloque de hielo flatando en el ugua para poder sustentar a un aulomóvil que pesa 1200 kg f?. El bloque tiene una altura de \( 2 \mathrm{~mm} .\left(\rho_{\text {hielo }}=0,9 \mathrm{gf} / \mathrm{cm}^{3}\right) \).

A box sitting on a horizontal surface is attached to a second box sitting on an inclined ramp by a rope that passes over an ideal pulley. The rope exerts a tension force I on both weights along the direction of the rope, and the coefficient of friction between the surface and boxes is 0.6 . If the box on the right weighs 100 pounds and the angle of the ramp is \( 35^{\circ} \), how much must the box on the left weigh for the system to be in static equilibrium? The box on the left must weigh approximately \( \square \) pounds for the system to be in static equilibrium. (Do not round until the final answer. Then round to two decimal places as needed.)

Esercizio: Sia dato un'auto che si trova a distanza di 50 km da Roma e dopo 1h si trova a 200km da Roma, dopo due ore si trova a 350km da Roma, dopo tre ore a 500 km da Roma scrivere la legge s = s(t) vista da un osservatore che si trova a Roma, che tipo di legge è? Darne la rappresentazione grafica. Trovare dove si troverà dopo 4 ore e mezzo. Scrivere la stessa legge però ponendo l'origine del sistema di riferimento questa volta nel punto da cui è partita l'automobile, che tipo di legge è? Trovare dove si troverà dopo 4 ore e mezza rispetto a questo sistema di riferimento. Verifiche orali

Answer True or False. 1. In motion means moving. 2. Scientists do not use a frame of reference to talk about motion. 3. You cannot tell whether an object is in motion unless you have frame of reference. 4. A frame of reference is some other object to which you compar an object's position. 5. When scientists study the motion of stars in the sky, they use clouds as a frame of reference.

1. If you were to visit a planet that was much more massive than earth, your mass would be a) More b) Less c) The same d) Impossible to tell without knowing which planet you are visiting. 2. Which of the following is not a form of light? a) radio waves b) microwaves c) x-rays d) All of the above are a form of light. e) None of the above is a form of light