Which devices might use electromagnets? pick all that apply.

1. audio speakers

2. plastic combs

3. trains

4. doorbells

5. revolving chairs

6. cranes

The wavelength of some blue light is 470.0 nm. what is the frequency of this blue light?

while elements and compunds are related, they are different. Unlike elements, compunds can be described as which of the following?

Which statements describe elements? Check all that apply. A) Atoms of the same element can have different numbers of protons. B) Atoms of the same element always have the same number of electrons.

A 0.005 kg bullet is travelling horizontally at a velocity of 250 m/s when it strikes a wooden block of mass 12 kg on a table at rest. the bullet sticks in the block of wood.

You are to create a story for a child of 5-6 years old. You will explain the brain and its functions to them. You need to use the following terms and explain their functions in simple terms.

Which of the following has more inertia: (a) a rubber ball and a stone of the same size? (b) a bicycle and a train? (c) a five-rupees coin and a one-rupee coin?

In a laboratory, you determine that the density of a certain solid is 5.23*10-6kg/mm3. Convert this density into kilograms per cubic meters.

List the solar objects in correct order from the Sun. Venus Earth Mercury Saturn Neptune Mars Jupiter Asteroid Belt The Sun Uranus

The power exerted by a muscle is the product of the force exerted and the velocity of contraction. The area of which of these shaded regions represents the power exerted while a weight is lifted at maximum speed?

How can you tell one element from another?