Cell membranes contain channels that allow ions to cross the phospholipid bilayer. suppose that a particular potassium channel carries a current of 2.0 pa. how many potassium ions (k) pass through it in 1.0 ms

Which of these IS an example of balanced forces? A. a book on a shelf B. air rushing out of a balloon C. rolling over and falling off the bed D. a car speeding up at a constant rate

A train blows its whistle as it enters a 50 m long tunnel. What is the time delay heard by a person at the other end of the tunnel between the sound of the train's whistle through the rails and through the air?

A proton accelerates from rest in a uniform electric field of 610 N/C. At some later time, its speed is 1.4 106 m/s. (a) Find the magnitude of the acceleration of the proton.

A 1/10th scale model of an airplane is tested in a wind tunnel. The reynolds number of the model is the same as that of the full scale airplane in air. The velocity in the wind tunnel is then

If you have two objects of the same mass colliding at the same speed but opposite directions, what situation will happen in an inelastic collision? a. The objects will collide and bounce back with the same initial velocity. b.

What is the period of a 1.00 m long pendulum?

Kaylie is describing the physical properties of an orange and a lemon. which two physical properties can she determine without using any measurement instruments

What is an example of a third class lever and why use it? A) pulley; changes direction B) baseball bat; increases velocity Eliminate C) car jack; increases the weight it can lift D) wheel barrow; makes it easier to move a load

1. The horizontal and vertical components of a projectile's velocity are a. directly proportional C. independent of each other b. inversely proportional d. equal

Which features involve compression? Select the three correct answers. A. Reverse faults B. Anticlines C. Folded mountains D. Normal faults E. Monoclines