A concave mirror forms a real image at the same position of the object, if the object is at 20cm away from the mirror then, (a) find the focal length of the mirro r(b) If the object is moved 5cm towards the , what will be the position of the image

The speed of light can be used to measure the

Energy flows from the producer level to the level. is called

The astronauts on the space shuttle flights experienced an acceleration of 29 m/s2 (about 3 "g's") during lift-off. what upward force must the astronaut's seat apply to the astronaut in order to cause this acceleration? assume the astronaut's mass is 70 kg, and compute this force when the acceleration is near the earth's surface so their weight equals latex: mg m g .