A particular engine takes in 10000 j of heat, does 2000 j of work, and as it runs discharges heat. its own energy is the same when it has finished as when it started. how much heat did it discharge if this is a closed system

In a motor, electrical current enters through the brushes. a. True b. False

A student sits on a rotating stool holding two 5 kg objects. When his arms are extended horizontally, the objects are 1.1 m from the axis of rotation, and he rotates with angular speed of 0.73 rad/sec.

A lamp rated 100w 220 v is connected to mains electric supply. what current is drawn from the supplyy line, if the voltage is 220 v?

Anna will wear a black dress when she attends her cousin's wedding. Which color (s) does the dress absorb? A. all colors B. no colors C. red and green D. white?

A baseball 0.145kg is thrown vertically upwards with an initial velocity of 20m/s. Use the law of conservation of energy to find how high it goes ignoring air resistance.

Between a substance and a mixture.

Two massive objects are fixed in position. A third object is placeddirectly between the first two at the position at which the totalgravitational force on the third object due to the two massiveobjects is zero.

Which statement best describes the magnetic properties of a material? Magnetic materials have many spinning, unpaired electrons Paired electrons of magnetic materials can move to other atoms Electrons of magnetic materials are strongly held by

when we examine the structures of the other terrestrial planets in our solar system, we see that their structure is similar to Earth's. Why do you think this is the case?

An ant is crawling along a straight wire, which we shall call the x axis, from A to B to C to D