Scientific writing Task: You charge your cell phone every night while you are
sleeping. Throughout the school day you see your cell phone
battery slowly decline. By lunchtime your cell phone is almost
dead. You remember in science class your teacher saying that
energy can't be created or destroyed. If the energy in your cell
phone battery wasn't destroyed, where did it go? Weave a story
around it with the mystery behind it.

20. threshold braking in the vehicle's braking system occurs when a. the brake pedal is pushed, heel on floorboard, with full foot pressure. b. the brakes are exerting full braking power, without traction loss. c. the driver begins pushing down the brake pedal, with moderate slowdown. d. the brakes just begin to take hold with a gradual slowdown.

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination.at the turning point, how far is the second student from the destination?

The electric field direction is defined by the direction of the force felt by (select one of the following answers): 1. a negative charge. 2. a positive charge. 3. both positive and negative charges.