When a passenger in train A looks at a passenger directly across in train B it appears that train B is not moving even though both trains are moving. How does the speed od train A compare to train B

An object of mass 82kg is accelerated upward at 3.2m/s/s. what force is required

Which of these IS an example of balanced forces? A. a book on a shelf B. air rushing out of a balloon C. rolling over and falling off the bed D. a car speeding up at a constant rate

The material removal processes are a family of shaping operations in which excess material is removed from a starting work part so that what remains is the desired final geometry: A. True B. False

Total internal reflection occurs only if

A student conducts an experiment to determine how the amount of water given to a plant affects its growth. What is the dependent variable for this experiment? a. the amount of water b. the height of the plant c. the amount of sunlight d.

Suppose a body has a mass of 60 kilograms and a velocity of 2 meters per second upward. What is the linear momentum?

Reflection and abssorption prevent some

Why is it important to change only one experimental variable at a time in an experiment?

A 0.0663 kg ingot of metal is heated to 241◦C and then is dropped into a beaker containing 0.395 kg of water initially at 25◦C. If the final equilibrium state of the mixed system is 27.4 ◦C, find the specific heat of the metal.

What does it mean when we say an atom has decayed?