A machine is supplied energy at a rate of 4000 watts and does useful work at a rate of 3761 watts what

is the efficiency of the machine

Which describes a natural environment with the least biodiversity? A. 20 small flowering plants, 44 polar bears B. 44 arctic foxes, 25 small flowering plants C. 31 polar bears, 19 arctic foxes, 52 small flowering plants D.

What is heat a measure of? A) kinetic energy B) potential energy C) thermal energy

If you shine a laser toward a friend in a spaceship who is moving away from you at half the speed of light, what do you see? you see the laser light pass your friend at slightly more than the speed of light.

The batteries in A flashlight rechargeable what energy conservation will have to take place in order to recharge the batteries.

How do you best determine whether j/m2 and m*s2/N are equivalent units? Compare the written form of the units to see if they look the same. Notice that one unit contains joules and other newtons.

5. The number of bonds an atom can form is represented in an electron dot diagram by A. pairs of dots B. unpaired dots C. total number of dots

A resistor has a current of 2 amperes when connected to a single battery. If a second identical battery is connected in series with the first, what is the current through the resistor? a) Still 2 amps b) 4 amps c) 1 amp d) no current

Describe some basic guidelines for safe PRE

Why is the liver important in digestion

A building 190 feet tall casts a 30 foot long shadow. if a person stands at the end of the shadow and looks up to the top of the building, what is the angle of the person's eyes to the top of the building (to the nearest hundredth of a degree) ?