When are magnets attracted and when are they repelled.

When a potassium ion (k+) enters a gaurd cell it creates a solution of what?

In atoms, electrons surround the nucleus in A) random patterns B) specific energy levels C) orbits like the planets D) a "plum pudding" type arrangement

5. If the total charge of an atom's nucleus is + 3 and the total charge of the surrounding electrons is - 3, the atom is (choose one.) a. Positively-charged b. Negatively-charged c. Electrically neutral d. Unstable

The skeletal system of animals structure and support. Which cell part provides a similar function in the cell? A. golgi apparatus B. cell membrane C. large central valcuole D. pili

A fl oor polisher has a rotating disk that has a 15-cm radius. The disk rotates at a constant angular velocity of 1.4 rev/s and is covered with a soft material that does the polishing.

A cell provides 6 V to an LDR. The current through this LDR is measured and is found to be 3 A. What is the resistance of the LDR?

A car travels along eastward with a constant velocity. the magnitude of the acceleration of the car is

What is the weight of a 65 kg astronaut on mars?

When lava cools, what type of Rock forms?

A uniformly charged conducting sphere of 1.1 m diameter has a surface charge density of 6.2 µC/m2. (a) Find the net charge on the sphere. (b) What is the total electric flux leaving the surface of the sphere?