A 10 kg sample of copper has 12,540 J of thermal energy. Determine the specific heat needed to raise the temperature from 15 °C to 40 °C.

15. give an example for some particles or waves that are moving faster than light in everyday life 16. what is a laser? 17. what is an oscilloscope? 18. what does it means practically that nothing is faster than light in vacuum? 19. what is vacuum?

Which sound characteristic is not affected by the relative motion of an object

While you are driving in the lane next to the curb on a multi-lane road the car on your left suddenly moves toward you lane. they are about toy crash into your front fender. you