Physicsacademic

Choose suitable examples of materials and their uses in order to provide an illustrated explanation of the properties of the following: conductivity, resistivity, insulators and conductors, ohmic and non-ohmic conductors, capacitors acting as filters in AC circuits and semi-conductors.

"Which statement best describes Gay-Lussac’s Law? Pressure and temperature are directly proportional to one another. Temperature and volume are directly proportional to one another. Temperature and volume are inversely proportional to one another. Pressure and temperature are inversely proportional to one another."

Determine the total resistance of each of the following parallel circuits. Then use Gizmo to check your answer. (You can calculate the total resistance from the current and voltage using Ohm’s law, or use the Ohmmeter to measure the resistance directly.) A parallel circuit with a 20-ohm resistor and a 10-ohm resistor. A parallel circuit with two 20-ohm resistors and a 10-ohm resistor. A parallel circuit with a 15-ohm light bulb and a 20-ohm resistor. A parallel circuit with two 100-ohm resistors and a 20-ohm resistor. A parallel circuit with a 10-ohm, 20-ohm, 100-ohm and 200-ohm resistor

A NASA spacecraft measures the rate, R, at which atmospheric pressure on Mars decreases with altitude as R = 0.0406 kPa km-1. Convert R to mJ m-4.

The speed limit on some interstate highways is roughly 125 km/h. A. What is this in meters per second? B. How many miles per hour is this?

Which equation best describes the law of conservation of momentum? A. p=mv B. F=ma C. Δp=FΔt D. p initial​ =p final ​

Why is density considered a physical property rather than a chemical property of matter?

Calculate the frequency in Hertz (Hz), which is equivalent to s−1 .

When using the tare function on a balance, start by _____________, then _____________ to cancel out that mass. Finally, _____________ and record the mass of your sample.

What is the conversion from RPM (revolutions per minute) to rad/s (radians per second)?

What is the conversion from Newtons to pounds (lbs)?

How many Jupiters could fit inside the Sun? The equation for the volume of a sphere is: V= 4/3 πr3

"Which is the best example of kinetic energy? A. A picture of a field of flowers in the sunlight. B. A picture of an owl sitting on a branch. C. A picture of a dog running. D. A picture of some rocks sitting on grass."

What is the SI unit for measuring weight?

What do we use a meter stick to measure?

Convert 3.20×10^4 J to kilojoules.

How deep can humans dive before being crushed by pressure?

"Which of the following have quantized values? Explain your selections. A. The pitch of a note played on a slide trombone B. The pitch of a note played on a flute C. The wavelengths of light produced by the heating elements in a toaster D. The wind speed at the top of Mt. Everest"

"Which physicist is known for having an electrical measurement named after him? A. Isaac Newton B. Michael Faraday C. James Watt D. Alessandro Volta"

What is the moment of inertia of a hollow disk?

What is the mass of a neutron?

"The speed limit on some interstate highways is roughly 115 km/h. What is this speed in meters per second? How many miles per hour is this?"

Does a spoon get warmer after sitting in a bowl of soup due to convection, conduction, or radiation?

Why is it important to use Kelvin instead of degrees Celsius in calculations involving temperature in gas laws?

"Which phrase describes blackbody radiation? A. Radiation that is absorbed by an object as it warms B. Light given off by an object based on its temperature C. Radiation that explains the wave model of light D. Light given off by an object based on its color"

Determine the net force using the given equations: f net ​= fa ​+ ff ​or f net ​= fa ​− ff

"One group notices that uncooked sausages sink to the bottom of the pot, and that when boiled, the cooked sausages float. The group suggests that floating or sinking can be used to test if a sausage is cooked. So they turn off the heat and write up the report. Much later, you notice that the cooked sausages have sunk to the bottom of the pot again. Briefly suggest why the sausages sink or float."

"Spiderman, whose mass is 80.0 kg, is dangling on the free end of a 12.0-m-long rope, the other end of which is fixed to a tree limb above. By repeatedly bending at the waist, he is able to get the rope in motion, eventually getting it to swing enough that he can reach a ledge when the rope makes a 60.0° angle with the vertical. How much work was done by the gravitational force on Spiderman in this maneuver? (Note: Ensure to include the required calculations to solve the problem.)"

What is the formula for height in physics?

The brightness of a light is determined by: Air temperature Intensity of light waves Wavelength Wave speed

You are helping with some repairs at home. You drop a hammer and it hits the floor at a speed of 8 feet per second. If the acceleration due to gravity (g) is 32 feet/second², how far above the ground (h) was the hammer when you dropped it? Use the formula: V=√2gh ​

"Which statement best describes an electron? It has a smaller mass than a proton and a negative charge. It has a smaller mass than a proton and a positive charge. It has a greater mass than a proton and a negative charge. It has a greater mass than a proton and a positive charge."

"What is current measured in? A. Volts B. Amps C. Watts D. Ohms"

What happens when an unstoppable force meets an immovable object?