How did people years ago find out which side of a magnet was north and which was south?

Compared to the sound of a car horn, the sound of a bird chirping has

According to Faraday's law, voltage can be changed by moving magnets away from the coil of wire. True False

The wave function for a traveling wave on a taut string is (in si units) y (x, t) = 0.340 sin 15πt - 4πx + π 4 (a) what are the speed and direction of travel of the wave? g

The cause of a fire in a computer is described as an incorrectly wired circuit. Which statement best explains the likely cause of the fire? The wiring contained a short circuit, so the reduced resistance caused an increase in current.

A 4,000-kilogram truck travels in a straight line at 10.0 m/sec. What is its momentum?

4. How far does a car travel in 90 seconds if it is traveling at a speed of 55 m/s?

Total energy input is 1400 and my efficiency is 80% so what is the useful energy output in jules?

What is the force of gravity acting on a 2000-kg spacecraft when it orbits two Earth radii from the Earth's center (that is a distance r=6380 km above the Earth's Surface. The mass of the Earth is 5.98 x 1024 kg.

An LC circuit has a 6.00 mH inductor. The current has its maximum value of 0.570 A at t = 0s. A short time later the capacitor reaches its maximum potential difference of 66.0 V. What is the value of the capacitance?

The first law of thermodynamics states that ΔE = Q - W. Is this also a statement of the principle of conservation of energy? Yes, the heat added and the change in internal energy of the gas equal the work done by the piston.