Science is to technology as Select one: a. a door is to an opening. b. microwave ovens are to kitchens. c. explosions are to dynamite. d. refraction is to eyeglasses.

Rubbing your hands together warms them by converting work into thermal energy. If a woman rubs her hands back and forth for a total of 11 rubs a distance of 7.50 cm each and with a frictional force averaging 71.

An ice skater has a moment of inertia of 5.0 kgm2 when her arms are outstretched. at this time she is spinning at 3.0 revolutions per second (rps). if she pulls in her arms and decreases her moment of inertia to 2.

Calcium metal reacts with a potassium chloride solution to form calcium chloride and potassium ions. Classify this reaction. Ca (s) + 2KCl (aq) → CaCl2 (s) + 2K + (aq)

An elevator is accelerating upwards at 3m/s. It has a mass of 300k. What is the net force (in Newton's) in the y-direction

List frog, bat, lobe-finned fish, and alligator in order of their relationship to humans. Start with the species most closely related to humans.

What is impossible for a machine to do? A) do a greater amount of work than the amount of work done on the machine B) apply a force in a direction that is different than the direction of the force applied to the machine C) move an object a greater

The phosphorus cycle keeps phosphorus availability naturally low. True or false?

Which best describes nuclear fission? A. A nucleus spontaneously splits and absorbs energy. B. Two nuclei spontaneously combine and absorb energy. C. A nucleus collides with a neutron and splits, releasing energy. D.

Which of the following is an example of conduction? A. A metal spoon becomes warm when placed in a cup of hot tea. B. Campers warm up while sitting by a campfire. C. A dog's bowl of water warms up out in the Sun. D.

Hink about the friction activity. Return to this activity to see it again if you need to. Explain what happened in each of the two demonstrations, and then compare them. Use the terms resistance, vacuum, gravity, velocity, and friction.