In each pair, select a substance that is a better heat conductor.

1. copper wire / wood 3. water / iron

2. water / air 4. iron / glass

An empty train car of mass 2.0 x 104kg coasts along at 10 m/s. A 3000-kg boulder is suddenly dropped vertically into the car. Find the speed of the car immediately after the boulder is dropped in.

How many kilograms are in 12321 grams?

If 15 mL of olive oil, 30 mL of ethanol, and 55 mL of distilled water were poured into a 100 ml beaker, in which order would the liquids layer from top to bottom?

How are engineers creating clothing that can charge your cell phone. Explain the science behind their innovation.

15cm3 block of gold weighs 2.8N it is carefully submerged in a tank of mercury. one cm3 of mercury weight 0.!3n a will the mercury be displaced by the gold?

A student throws a 5.0-newton ball straight up. What is the net force on the ball at its maximum height? (1) 0.0 N (3) 5.0 N, down (2) 5.0 N, up (4) 9.8 N, down

An object starts from rest and falls freely for 40. meters near the surface of planet P. If the time of fall is 4.0 seconds, what is the magnitude of the acceleration due to gravity on planet P?

Consider two metallic rods mounted on insulated supports. One is neutral, another positively charged. The charged rod is brought close to the neutral one (no touching!

Which term identifies the dark smooth areas on the surface of the moon? craters terrae maria regolith

1. work is a transfer of 2. a small 20-killogram canoe is floating downriver at a speed of 2 m/s. what is the caanoes kinetic energy?