When aluminum foil is formed into a loose ball, it can float on water. But when the ball of foil is pounded flat with a hammer, the foil sinks. why?

A 60-Hz, single-phase source with V 5 277/308 volts is applied to a circuit element. (a) Determine the instantaneous source voltage.

Do thermohaline currents flow vertically or horizontally A. Vertically B. Horizontally

Easy yes or no question! Do phytoplankton turn carbon dioxide to oxygen?

Bill has a mass of 85 kg and is skating west. He increases his speed from 3 m/s to 5 m/s by applying a force for 3 seconds. What force did he apply?

Explain why mass is constant everywhere

The current in a wire increases from 5 A to 10 A, what happens to its magnetic field? The field is twice as strong the distance of a charged particle from a wire changes from 10 cm to 20 cm, what happens to its magnetic field?

At a constant pressure and a temperature of 280 K, the gas in a cylinder has a volume of 10.0 liters. If the volume of the gas is increased to 20.0 liters, what is the new temperature? 2800 K 28 K 140 K 560 K

what must be the distance between source of sound and mountain to give an echo in 5 seconds?, (speed of sound at 0°c=33m/sec

What is the speed of a 50 g rock if its de Broglie wavelength is 3.32 x 10?

Leanne is riding a bike. The forward force from her pedalling is 18N. There is a backward force of 6N from friction and a backward force of 12N from air resistance. Does the speed of the bike increase, decrease or not change?