Which of these is an element?

-hematite - gold - quartzite - pyrite

1. A 1 kg hockey puck is moving at 10 m/s across the ice. At the other end of the ice rink, its speed is measured at 9.2 m/s.

Listing a species in accordance with the endangered species act will not do that species much good unless

A 4.2-m-diameter merry-go-round is rotating freely with an angular velocity of 0.80 rad? s. Its total moment of inertia is 1360 kg? m2. Four people standing on the ground, each of mass 65 kg, suddenly step onto the edge of the merry-go-round.

One major difference between the innerand outer planetsis that the

Can more people see a total solar eclipse or a total lunar eclipse? Explain.

What is caused by extra estrongen in women

Which force is the more dominant one in the hydrogen atom, the gravitational or the electrical? by what factor?

Name the elements from which nichrome can be made.

The power output of a typical large power plant is 1000 megawatts (MW). Express this result in W, kW, and GW

During an experiment, a toy car accelerates forward for a total time of 5s. Which procedures could a student use to determine the average net force exerted on the car during the 5s that the car accelerates?