Which of the following is a metal?

Calcium (Ca)

Iron (Fe)

Sodium (Na)

all of these

Which action can be explained by physics? A. the growth of fungus on a piece of bread B. the mixing of sodium and chlorine to form common salt C. the interactions between predators and prey in an ecosystem D.

Explain how the existence of isotopes is related to atomic masses not being whole numbers

Why can't the efficiency of a heat engine be 100%?

How do I obtain the poon?

Describe a situation where two unbalanced forces are acting on a box.

If you have a 90 V power source with a 30-Ω and 60-Ω resistor in series, what is the voltage drop over the 60-Ω resistor? 30 V 2 V 60 V 90 V

How is thermal energy transferred during convection?

What is the purpose of a free body diagram? A. to show the velocity of an object B. to show the acceleration of an object C. to show the forces acting on an object D. to show the direction of motion vectors of an object

An initially uncharged air-filled capacitor is connected to a 5.83 V charging source. As a result, 3.41*10-5 C of charge is transferred from one of the capacitor's plates to the other.

Which objects are inclined planes? Check all that apply. a nail a staircase a seesaw a wheelchair ramp a slide