The first periodic table of elements Mendeleev created contained how many elements

A hydrogen fuel cell supplies power for a small motor. the fuel cell delivers a current of 0.5 a and a voltage of 0.43 v. what is the power supplied to the motor by the fuel cell?

If an astronaut moved away from earth in the direction of the moon how would the gravitational force between the earth and the astronaut change

Which element has a - 2 charge? Magnesium Sulfur Sodium Hydrogen

An Unfair Race This applet shows the results of releasing a frictionless block and a rolling disk with equal masses from the top of identical inclined planes.

Where is subduction most likely to occur? a. near a normal boundary b. at a convergent boundary c. at a divergent boundary d. near a transform boundary

Which best blocks X-ray particles and can therefore be observed more closely through the use of this technology?

A light ray travels inside a horizontal plate of glass, striking its upper surface at an angle of incidence of 50°. This ray is totally internally reflected at the glass-air boundary. A liquid is then poured on top of the glass.

A stationary object has no forces acting on it. True False

April swims 50 m north and then turns and swims 20 m back to the south. What is her velocity if it takes her 60 seconds?

What happens to the mass of an object when it is cooled?