What is The focal length of a concave mirror

Immediately outside a conducting sphere (i. e. on the surface) of unknown charge Q and radius R the electric potential is 190 V, and 10.0 cm further from the sphere, the potential is 140 V. What is the magnitude of the charge Q on the sphere

1. of the choices below, which unit of measurement would be most appropriate for measuring the mass of a truck?

How many electrons in Cu

A student is turning the handle of a generator. another student connects a Bulb to the generator. the bulb lights up. The first student continues to turn the handle of the generator at the same speed, but finds it harder to turn.

5.0 kg and 7.0 kg weight are placed on opposite ends of a massless 4.0 m rod (5.0 kg on the left, 7.0 kg on the right).

A driver in a car traveling at a speed of 21.8 m/s sees a cat 101m away on the road. How long will it take for the car to accelerate uniformly for 3.2 km in 3.5 min. How fast (in m/s) is the car moving after this time?

Select all the correct answers. A free-falling golf ball strikes the ground and exerts a force on it. Which sentences are true about this situation? - A golf ball striking the ground is a collision.

The spreading of sound waves around openings in barriers is called

An object has a mass of 8.00 kg what is the gravitational force on the object on earth

Which of the following scientists studied physics in Egypt?