On a graph showing distance versus time, a horizontal line represents an object that is?

a. moving at a constant speed

b. increasing its speed

c. decreasing its speed

d. not moving at all

A wire has a current density of 6.25 * 10 6 A / m 2 6.25*106 A/m2. If the cross-sectional area of the wire is 1.79 mm 2 1.79 mm2, what current I I does the wire carry?

A machine runs for 50 seconds with a steady power output of 100 watts. How many joules of work does the machine produce in those 90 seconds?

Which of the following systems is not true about machines?

What are two ways friction can be reduced and what is one way friction can slow down a roller coaster?

A 630 W bulb and a 315 W bulb are both designed to operate at standard household voltage of 120 V. Determine which bulb has the lower filament resistance and then calculate the value of its resistance.

Critical thinking! Applying Concepts A desk exerts an upward force to support a computer resting on it. Does this force do work? Explain.

When an inclined plane is used, A. the mechanical advantage increases as the height increases. B. a smaller force is exerted over a longer distance. C. a negative mechanical advantage can result. D. a greater force is exerted over a shorter distance

A 4-kg cat is resting on a bookshelf that is 3m high. What is the cats gravitational potential energy relative to the floor if the acceleration due to gravity is 9.8m/s squared

If a 100 N net force act on a 50-kg car, what will the acceleration be

According to the modern classification system, which list is written correctly from least specific to most specific?