Susan is quite nearsighted; without her glasses, her far point is 39 cm and her near point is 16 cm . Her glasses allow her to view distant objects with her eye relaxed. With her glasses on, what is the closest object on which she can focus?

1. a camcorder has a power rating of 19 watts. if the output voltage from its battery is 7 volts, what current does it use?answer units 2. a 1.5m wire carries a 6 a current when a potential difference of 57 v is applied. what is the resistance of the wire? yourunits 3. a clothes dryer uses about 2 amps of current from a 240 volt line. how much power does it use? yourunits 4.

The escape velocity of any object from earth is 11.2 km/s. (a) express this speed in m/s and km/h. (b) at what temperature would oxygen molecules (molecular mass is equal to 32.0 g/mol) have an average velocity v_{rms} rms equal to earth’s escape velocity of 11.1 km/s?

Some electronic devices such as phones and watches can be charged wirelessly. in the charger, there is a coil that generates a rapidly changing magnetic field. in the device, there is a second, 100-turn rectangular coil with side length of 3.0 cm and 4.0 cm. if the maximum rate of the change of the magnetic field and the second coil is 53 t/s, what is the emf induced in this coil?