How is a magnetable to pick up bits of metal without actually touching them? A. The magnet is surrounded by an electric field that attracts the metal.
B. The metal exerts a repulsive force on the magnet
C. There is an invisible magnetic field around the magnet where it exerts magnetic force

An automobile of mass 2000 kg moving at 30 m/s is braked suddenly with a constant braking force of 10000 n. how far does the car travel before stopping?

Wo audio speakers are placed on a vertical rail. speaker a is placed at head-level while speaker b is place at some variable height, \delta yδy, above speaker a. both speakers receive simultaneous input from a sine-wave generator so the speakers each produce a pure sinusoidal sound wave with a wavelength of 0.531 meters. calculate the lowest height that speaker b can be placed above speaker a to produce a minimum of sound heard by person standing \delta x = 7.86δx=7.86 meters directly in front of speaker a.

The least penetrating form of radiation is