Does observing a physical property of a substance change the identity of the

substance? Explain your answer.

Calculate heat produced when 80000 coulombs of charge is transferred in 1/2 hour through a potential difference of 40 volts

When a car is weighed, it is driven slowly on a horizontal floor over a scale that records a reading as the front wheels go over the scale, and then records a second reading as the rear wheels go over the scale.

Who among the following educators did not contribute to the study or play? A. Howard Gardner B. Jean Jacques Rousseau C. Johann Amos Comenius D. Friedrich Froebel

Use evidence to explain why glass refracted more light than air or water

Two Carnot air conditioners, A and B, are removing heat from different rooms. The outside temperature is the same for both rooms, 313 K.

A nuclear power plant generates a total of 150mw of power and 45% of this power is wasted heat that is discharged on the cooling water of a river. the river flows at 660.43 gal/s and has an upstream temperature of 64.4 ⁰f.

The universe is believed to have been form from a very dense fireball billions of years ago.

What does the slope of the line on this velocity versus time graph represent? A. positive deceleration B. zero acceleration C. positive acceleration D. negative acceleration

Which of the following objects has the greatest kinetic energy? a baseball flying through the air at 90 miles per hour a baseball flying through the air at 45 miles per hour a baseball flying through the air at 20 miles per hour a baseball sitting

Peter found an amazing fact in an amusement park when he tried to ride the Magic Mountain Superman. Powerful magnets accelerate a car and its riders from zero to 45 m/s in 7 seconds. Suppose the mass of the car and riders is 5,600 kg.