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

A rollercoster car and passengers of total mass 1800kg starts from rest at 80m above the ground. Ignoring air resistance and friction what will the speed be: At ground level At top of the next peak which has height of 30m Take gravity 10N/kg i

Wind resistance is jointly proportional to velocity and surface area of the object. If an object is traveling 45 mph and has a surface area of 49 square feet it will experience a wind resistance of 496.125 Newtons.

If gravity is always pushing down on you, what prevents you from sinking down into the ground? A. The ground is pushing you but with a greater force. B. The ground is pushing you up with a lesser force. C.

What name is given to the wall of water that makes landfall just ahead of a hurricane? a. storm surge b. tsunami c. cyclone wave d. hurricane flood?

According to the Big Bang theory, after the "Bang", the universe remained dark until about ___ later, when neutral atoms began form. *three minutes *one billion years *300,000 years *three billion years

The contamination that results from the spread of bacteria from meat to vegetables is called

A rock has a mass of 5 kg on the moon. What is the mass of the rock on the earth

A battery applies 45 volts to a circuit, while an ammeter reads 10 ma. later, the ammeter reading drops to 7 ma. assuming the resistance has not changed, the voltage must have

A 150-kg object takes 1.5 minutes to travel a 2,500 - meter straight path. It begins the trip traveling 120 m/s and decelerates to a velocity of 20 m/s. What is the acceleration?

Lava is rock that has undergone a physical change and has liquefied. What is known about this change?