Unit Test — Cumulative exam Answers

Two identical waves are traveling toward each other in the same medium. One has a positive amplitude, meaning that its peaks only go upward, and the other wave has a negative amplitude, with peaks going downward.

A wire is joined to points X and Y in the circuit diagram shown.How does the circuit change when the wire is added?

Once started, why can nuclear fission continue to occur on its own?

Which statements correctly describe the effect of distance in determining the gravitational force and the electrical force? Check all that apply.The gravitational force has an infinite reach.The electrical force has an infinite reach.The gravitational force is inversely proportional to the distance.The electrical force is inversely proportional to the distance.The gravitational force is inversely proportional to the square of the distance.The electrical force is inversely proportional to the square of the distance.

It requires 350 joules to raise a certain amount of a substance from 10.0°C to 30.0°C. The specific heat of the substance is 1.2 J/g°C.

The two waves shown here are the same distance from point X and are traveling toward each other.

A current of 1.8 A delivers 2.5 C of charge.How much time was required?

What do MRI and ultrasound have in common as diagnostic imaging techniques? Check all that apply.low risk for tissue damageuses radio wavesnoninvasivetomographic imagingno radiation

Takumi works in his yard for 45 minutes each Saturday. He works in the morning, and he wears sunscreen and a hat each time he works in the yard.What does Takumi hope to reduce through his actions?

Which properties can be used to determine whether a substance is a liquid or a plasma? Check all that apply.the mass of the substancethe container of the substancethe charge of the substance’s particlesthe distance between the substance’s particlesthe compressibility of the substancethe color of the substance

Which statement is part of Dalton's atomic theory?

What is the best description of a wave?

The ray diagram shows a vase that is placed beyond the center of curvature of a concave mirror.

Which changes in an electric motor will make the motor stronger? Select 3 options.using a stronger permanent magnetusing a weaker permanent magnetincreasing current in the electromagnetdecreasing current in the electromagnetincreasing the distance between the magnetsdecreasing the distance between the magnets

Which best explains why infrared waves are ineffective for treating cancer?

Which factors affect the strength of a magnetic field around a current-carrying wire? Check all that apply.the type of metal of the wirethe amount of the currentthe direction of the currentthe temperature of the wirethe distance from the wire

A 6 cm object is 15 cm from a convex lens that has a focal length of 5 cm. What is the distance of the image from the lens, to the nearest hundredth?

Which fields would most likely make use of spectroscopy techniques? Select 4 options. food productionmedical researchscientific researchspace researchweather forecasting