Question

Approximately every _?_ years, the Earth's revolution changes.

O

50,000

O

26,000

o

1 million

0

12,600

The head of a state government in the United States is referred to as which of the selections below?

Why do you think it is difficult to use carbon-14 to determine the age of extremely old objects (over 50,000 years) ?

A child pulls a balloon for 12 m with a force of 1.0 n at an angle of 60 below horizontal. how much work does the child do on the balloon?

Why are diamonds so good at cutting things answers?

Two cars approach each other on a straight and level road. Car A is traveling at 75 km/h, due north and Car B is traveling at 45 km/h due south. Both velocities are measured relative to the ground.

A race car travels a circular track at an average rate of 135 mi/hr. The radius of the track is 0.450 miles. What is the centripetal acceleration of the car?

Between a substance and a mixture.

Two massive objects are fixed in position. A third object is placeddirectly between the first two at the position at which the totalgravitational force on the third object due to the two massiveobjects is zero.

Which statement best describes the magnetic properties of a material? Magnetic materials have many spinning, unpaired electrons Paired electrons of magnetic materials can move to other atoms Electrons of magnetic materials are strongly held by

when we examine the structures of the other terrestrial planets in our solar system, we see that their structure is similar to Earth's. Why do you think this is the case?