Какая сила действует на протон, движущийся со скоростью 2*10^6 м/с в однородном магнитном поле с индукцией 0,1 Тл? Протон движется под углом 30 градусов к линиям магнитной индукции поля.
На электрический заряд,движущийся в магнитном поле действует сила лоренца:F=q*v*B*sina ,где q=1.6*10^-19 кл -заряд протона.
Ex. 1. Use the infinitive with to or infinitive without to.
1. I like ____ dance. 2. I'd like____dance. 3. I shall do all I can ____ help you. 4. She made me ____ repeat my words several times. 5. I saw him ____ enter the room. 6. She did not let her mother ____ go away. 7. Do you like ____ listen to good music? 8. Would you like ____ listen to good music?
Ex. 2. Translate these sentences into Russian paying attention to -ing form.
1. Repairing cars is his business. 2. It goes with¬out saying. 3. Have you finished writing? 4. Taking a cold shower in the morning is very healthy. 5. I like skiing, but my sister prefers skating. 6. It looks like raining. 7. My watch wants repairing. 8. Thank you for coming.
Ex. 3. Put the verbs in brackets –ing form.
1. Why do you avoid (to speak) to me? 2. The doctor insisted on (to send) the sick man to hospital. 3. He showed no sign of (to recognize) me. 4. He had a strange habit of (to interfere) in other people's business. 5. He is good at (to repair) cars. 6. He was always ready for (to help) people. 7. The watch requires (to repair). 8. The problem is not worth (to discuss).