An electric current produces a magnetic field.

a. True

b. False

When lava cools, what type of Rock forms?

A baby cow has a mass of 100 kg and chases its mother at a speed of 0.5 m/s. What is the magnitude of its momentum?

Which statement best summarizes the central idea of "Applications of Newton's Laws"? A. Newton's laws can explain the forces that occur between objects every day. B. Newton's laws are useful for explaining why we should make good decisions. C.

A car is traveling at a constant speed of 12 m/s when the driver accelerates the car reaches a speed of 26 m/s in 6 s what is the average acceleration of the car?

Two boat landings are 1.0 km apart on the same bank of a stream that flows at 1.0 km/h. A motorboat makes the round trip between the two landings in 50 minutes. What is the speed of the boat relative to the water?

Which of the following best describes each particle? A. Protons are negative, neutrons are neutral, and electrons are positive. B. Protons are neutral, neutrons are positive, and electrons are negative. C.

During World War II, both the Allied and Axis powers used propaganda to A. weaken public support for the war. B. downplay public opinion. C. manipulate the public through the use of humor. D. shape public support of the war

What type of simple machine is a hand drill? A) pulley B) wedge C) ramp D) screw

Calculate the wavelength and frequency of the radiation emitted by the electronic transition from the 10th to the 9th excited state of hydrogen.

An unknown fluid has a specific gravity of 0.750. What is the volume of 22.5 kg of this fluid? A. 10 L B. 20 L C. 30 L D. 40 L