Why is a tank filled with water a good conductor

How long must a simple pendulum be if it is to make exactly one swing per six seconds? (that is, one complete oscillation takes exactly 12 s.) ?

Which of the following is NOT a result of supernova explosions? The neutron core is completely destroyed. Any planets within a few dozen light-years receive a life-threatening dose of radiation.

Which is an example of radiation? Check all that apply. Troy's hand is burned when he touches hot wax. Earth is heated by energy from the Sun. A hot dog is held over a fire and gets warm. Soup is heated in a microwave.

A child sits motionless on a swing. Which of the following forces does not act on the swing?

Force per unit area defines which of the following? gravity pressure force temperature

A grocery shopper tosses a (n) 9.1 kg bag of rice into a stationary 19.3 kg grocery cart. The bag hits the cart with a horizontal speed of 6.6 m/s toward the front of the cart. What is the final speed of the cart and bag? Answer in units of m/s.

Where do most metamorphic rocks processes take place?

A 13,500 kg railroad freight car travels on a level track at a speed of 4.5 m/s. It collided and coupled with a 25,000 kg second car, initially at rest and with brakes released. What is the speed of the two cars after collision

What type of waves move energy forward, but the source makes up and down

Why do helium balloons float? Talk about density of atoms and compare to elements in the air.