When a plastic rod is rubbed with a wool cloth, the wool acquires a positive charge. What is the best explanation for this effect?

Which of the following would demonstrate an attraction between magnetic poles? A. north pole to a north pole B. south pole to a south pole C. north pole to a south pole

Suppose that a particular artillery piece has a range R = 5580 yards. Find its range in miles. Use the facts that 1mile=5280ft and 3ft=1yard. Express your answer in miles to three significant figures ...

Animation skills include all of the following, except which? a. layering c. drawing b. sketching d. acting

Sunsets are red because A. the longest path of sunlight through the atmosphere is at sunset or sunrise. B. a lot of high-frequency light is scattered by the atmosphere. C. blue light from the sun is scattered by Earth's atmosphere. D.

Describe the basic internal structure of Mercury.

A 0.0010-kg pellet is fired at a speed of 50.0m/s at a motionless 0.35-kg piece of balsa wood. When the pellet hits the wood, it sticks in the wood and they slide off together. With what speed do they slide?

Jim measures the count rate of a sample of americium-241 as 120cpm. Roughly how long would it take for the count rate to fall below 4 cpm. Show your working

Explain and give an example of newtons 3rd law of motion

Which term best describes the two substances that react to form salt?

An object is dropped from rest into a pit, and accelerates due to gravity at roughly 10 m/s2. It hits the ground in 5 seconds. A rock is then dropped from rest into a second pit, and hits the ground in 10 seconds.