A student practicing for a cross country meet runs 250 m in 30 s. What is her average speed?

Which of the following has the strongest magnetic field? Earth, the Sun, Jupiter, a pulsar

When the mover pushes the box, two equal forces result. explain why the box moves even though the forces are equal and opposite?

A 20 N unbalanced force causes an object to accelerate at 1.5 m/s2. What is the mass of the object?

How much work does gravity do on the compressor during this displacement?

Which of the following is NOT an example of a mechanical wave? A) ultraviolet rays radiating from the sun to tan you on the beach B) vibrations of a guitar string C) ocean waves D) sound waves

Suppose that, while lying on a beach near the equator of a far-off planet watching the sun set over a calm ocean, you start a stopwatch just as the top of the sun disappears. you then stand, elevating your eyes by a height h = 1.

Suppose you want to know if the color of peoples hair affects how warm it can keep their heads. describe the skills you would use to conduct an experiment to test your inquiry

The mass is increased by a factor of four. What is true about the period? Choose the best answer. The period remains unchanged. The period increases by a factor of four. The period is halved. The period doubles.

What does law of conservation of mass mean?

Why do substances with free electrons make the best conductors.