A boat takes 3.0 hr to travel 27 km down a river, then 6.0 hr to return. How fast is the river flowing?

A current carrying wire wrapped around an iron ore is called a

Energy firm the sun is transferred to earth trough convection

Which pulls harder gravitationally, the earth on the moon, or the moon on the earth? which accelerates more?

Assertion: A normal human eye can see clearly all the objects below and above 25 cm Reason: The human eye has the capacity to suitable adjust the focal length of its lens to a certain extent.

Which statements below describe the changes that molecules undergo when heat is applied to a single phase? (Select all that apply.) a. The heat energy causes an increase in the bond vibrations within the molecule. b.

A building 190 feet tall casts a 30 foot long shadow. if a person stands at the end of the shadow and looks up to the top of the building, what is the angle of the person's eyes to the top of the building (to the nearest hundredth of a degree) ?

The frequency of which type of electromagnetic wave is just higher than that of visible light? A. infrared waves B. gamma rays C. x-rays D. radio waves E. ultraviolet rays

Two circular coils are concentric and lie in the same plane. The inner coil contains 140 turns of wire, has a radius of 0.015 m, and carries a current of 7.2 A. The outer coil contains 180 turns and has a radius of 0.023 m.

Which best describes how magnesium (mg) and oxygen (o) bond? they form an ionic bond by exchanging two electrons. they form an ionic bond by exchanging three electrons. they form a covalent bond by sharing one electron.

The coefficient of linear expansion of steel is 12 * 10-6 k-1. what is the change in length of a 25-m steel bridge span when it undergoes a temperature change of 40 k from winter to summer? a. 1.2 cm b. 1.8 cm c. 1.4 cm d. 2.0 cm e. 1.6 cm