What element has 81 protons in the nuclei of atoms

A fuse in an electric circuit is a wire that is designed to melt, and thereby open the circuit, if the current exceeds a predetermined value. Suppose that the material to be used in a fuse melts when the current density rises to 440 A/cm2.

Consider applying Newton's second law to a man riding an elevator (perhaps to calculate his acceleration). show answer Incorrect Answer Which of the following forces must be considered? Choose all that apply.

What’s the first step you would take to build a voltaic cell?

A golf ball is hit with an initial speed of 33 m/s at an angle less than 45∘ above the horizontal.

Describe all the differences you can think of between light waves, sound waves, or water waves.

One mole of water is equivalent to 18 grams of water. a glass of water has a mass of 200 g. how many moles of water is in this?

A ball is thrown upward and reaches a maximum height of 100m and then returns back to where it was launched. The displacement of the ball is A) 0 m B) 100 m C) 200 m D) more than 200 m

What does the difference in force depend upon?

An aircraft with the mass of 300000kg is flying at an altitude of 2000m with a speed of 100m/s what is the kinetic energy of the aircraft

What is the main idea behind the law of definite proportions?