1) A force of 20 Newton acts on a bar having a cross sectional area of 0.8m^2 and length 10cm. calculate the stress developed in the bar

At one time aluminum rather than copper wires were used to carry electric current through homes. Which wire must have the larger radius if they are the same length and need to have the same electrical resistance?

Acceleration is best described as the rate of change in?

Felix has three metal bowls that are the same shape and size. Felix fills each bowl to the top with boiling water. The first bowl holds 2.5 liters, the second bowl holds 1.0 liter, and the third bowl holds 0.75 liters.

The law of inertia applies to A. moving objects B. objects that are not moving C. both moving and non-moving objects

Which statements describe the wave? Check all that apply. The wave is a mechanical wave. The wave is an electromagnetic wave. The wave moves energy through matter. The wave moves energy through space without matter.

What is a device made by joining two different materials to form a circuit that produces an electric current? a. convertor b. resistor c. semiconductor d. thermocouple

An elevator weighing 15000 newtons s raised in 50 seconds. If the distance between stories is 3.0 meters how much power is required of the motor?

Given the diamond shape of a baseball field and the speed with which baseballs are hit, why is it harder for a hitter to hit a homerun to center field than to right or left field? (Consider the effect of air drag on fast moving projectiles.)

What is the arrangement of the forms of electromagnetic radiation according to their wavelengths?

A helium atom consists of two protons, two electrons, and two neutrons. In the helium atom, the strong force is a fundamental interaction between the (1) electrons, only (2) electrons and protons (3) neutrons and electrons (4) neutrons and protons