A man dressed in all black is walking down a country lane. Suddenly, a large black car without any lights on comes round the corner and screeches to a halt. How did the car know he was there?

Explain the advantages and disadvantages of a dynamo compared with batteries for bicycle lights

What distance formula

An electroscope is a fork-shaped device commonly used to detect the presence of charge. The tin leaves of an electroscope will separate when charged negatively.

Which change will cause the gravitational force between a baseball and a soccer ball to increase? Check all that apply.

n aluminium bar 600mm long, with diameter 40mm, has a hole drilled in the center of the bar. The hole is 30mm in diameter and is 100mm long.

How work done against gravity can be expressed?

An electron is acted on by two electric forces, one of 2.7*10-14 N acting upward and a second of 5.8*10-14 N acting to the right. What is the magnitude of the electric field at the electron's location?

A satellite on a Low Earth Orbit is flying with a speed of 7.65 km/s. The vertical component of the Earth's magnetic field is 35.3 μT at the current location of the satellite.

A central air conditioner uses 4.5 kilowatts. It runs for 10 hours over the course of a day. How much energy does the air conditioner use during that day?

Hich of the following needs is an addition to Maslow's original hierarchy and only appears in the eight-stage revised model