When a wire is made smaller, the resistance increases. Which happens to the electric current?

a) It decreases.

b) It increases.

c) It stays the same.

How much work must be done to accelerate an 8.5*10^5 kg train from a) 10m/s to 15m/s b) 15m/s to 20m/s and c) to an Initial stop of 20m/s

Which of the following is an example of Newton's third law of motion? an object accelerating toward earth a bouncing ball a floating balloon a satellite orbiting a planet

True or false The expression that relates emf, potential, current, and resistance is Ohm's law.

An object with a mass of 20 kg has a net force of 80 N acting on it. What is the acceleration of the object? 0.25 m/s2 4 m/s2 O 60 m/s2 100 m/s2

The gravitational force between two objects of masses m1 and m2 that are separated by distance r is The gravitational force between two objects of masses and that are separated by distance is A. proportional to r. B. proportional to 1/r. C.

Which devices might use electromagnets? pick all that apply. 1. audio speakers 2. plastic combs 3. trains 4. doorbells 5. revolving chairs 6. cranes

Match each type of line or symbol, common to geologic maps, to its description. 1. Fault Line A. very dark and thick line 2. Contact Line B. very light and thin line 3. Axis Fold C. look like a stubby T 4. Strike and Dip D.

You drop your backpack out of a window from a height of 8.3 m. What is the impact speed of your backpack? A. 163 m/s B. 1.2 m/s C. 21.3 m/s D. 12.8 m/s

What is the kinetic energy of a car that has a mass of 1,600 kg and is moving at 22 m/s?

Which is an example of a transverse wave? A. sound B. electromagnetic C. water D. seismic waves