Using a cathode ray tube, Thomson confirmed that

atoms must have an overall positive charge.

atoms are made of particles that have a negative charge.

electrons in atoms must have varying amounts of energy.

electrons are only found in the nucleus.

Nan investigated how many students at her high school had summer jobs. Which of the following is the procedure of her investigation? A. If about 75 percent of all students at Central High have summer jobs, then about 1200 students have summer jobs.

In a standing wave, there is both constructive and destructive interference. True or False?

An alpha particle travels at a velocity vector v of magnitude 660 m/s through a uniform magnetic field vector B of magnitude 0.060 T. (An alpha particle has a charge of + 3.2 10-19 C and a mass of 6.6 10-27 kg.

Positive ions differ from neutral atoms in that A) positive ions have lost protons. B) positive ions have gained protons. C) positive ions have lost electrons. Eliminate D) positive ions have gained electrons.

A steel cable supports an actor as he swings onto the stage. The weight of the actor stretches the steel cable. To describe the relationship between stress and strain for the steel cable, you would use: a. both shear modulus and bulk modulus. b.

If a force of 40 newtons moves a cart a distance of 9 meters, the work done is Nm. If the same force moves the same cart three times that distance, the work done is Nm. NextReset

What is the critical angle c for total internal reflection if the material is clear acrylic, with a refractive index of 1.5?

What is happening if energy input remains constant and voltage remains the same in a circuit, but the current decreases? A. The resistance has increased. B. The volts have decreased. C. The power has increased.

The velocity - time graph of a ball of mass 25g moving on road is as given below: (a) How much force does the road exert on the ball to bring it to rest? (b) What is the direction of the force exerted by the road?

A spring required a force of 5.0 n to compress it 0.1 m. How much work is required to stretch the spring 0.4 m?