What would happen if a lightning rod on the roof of a house did not have a wire to the ground? Why?

A wave has frequency of 50 Hz and a wavelength of 10 m. What is the speed of the wave?

A source of sound is detected in the middle of a room. Which can account for a decrease in sound intensity for an observer?

Which is a "big idea" for matter and change 1.) atoms are building blocks of all things 2.) the laws of nature have all been discovered 3.) forces cause changes in motion 4.) the universe is very old and large

The torque of a system whose force is 30n and length is 2m

Which of the following statements are true? 1. Liquid water expands with increasing temperature above 4°C. 2. Liquid water expands with increasing temperature between 0°C and 4°C. 3. Water contracts as it freezes at 0°C. 4.

While competing in the olympics, an athlete hurls a discus with a velocity of 14 m/s at an angle of 51. what is the horizontal component of the discus's velocity?

2. A 1.00 x 103 kg sports car accelerates from rest to 25.0 m/s in 7.50 s. What is the average power output of automobile engine? a. 20.8 kW b. 30.3 kW C. 41.7 kW

Explain what is meant by the term "electrical resistance"

Carlito is afraid of dogs. He practices positive visualization whenever he sees a dog. Carlito's visualizations function as: a) positive reinforcers. b) conditioned stimuli. c) conditioned responses. d) unconditioned stimuli.

What properties of sound determine the pitch of sound? How is this affected by motion of the sound source? Be specific.