A Person needs a lens of power -2.5D to correct his vision (a) what kind of defect in vision is he suffering from? (b) what is the focal length of the corrective lens? (c)what is the nature of the corrective lens?

On mars a rock falls an unknown vertical distance from a resting position and lands in a crater. if it takes the rock 2.5 seconds to fall, how high is the cliff the rock fell from? mars' surface gravity is 3.8 m/s2. a. 9.5 m b. 11.9 m c. 15.2 m d. 23.8 m

Acharge q experiences no net force at a particular point in space. which of the following situations described below must always be true? -there are no other charges nearby. -if there are other charges nearby, they must all have the same sign as q. -if there are other charges nearby, they must all have the opposite sign of q. -if there are other charges nearby, the total positive charge must equal the total negative charge. -none of the above

Ln finding the density of liquid why is the method of using a density bottle more accurate than the one of using a measuring cylinder