An iron nail, if thrown into the sea, will sink. But, an entire ship made of iron will float on the water. Give reasons.

Glycerin at 20 °c flows upward in a vertical 75-mm - diameter pipe with a centerline velocity of 1.0 m/s. determine the head loss and pressure drop in a 10-m length of the pipe.

A 1.200 kg car travels at 20 m/s. What is its momentum? P=mv A) 24000 kg m/s B) 14000 kg m/s C) 8000 kg m/s D) 1220 kg m/s

How do you describe the motion of an object?

A 2,300-kg truck is traveling down a highway at 32 m/s. What is the kinetic energy of the truck? A. 1,200 J B. 37,000 J C. 1,200,000 J D. 37 J

A 49.3 g ball of copper has a net charge of 2.0 µc. what fraction of the copper's electrons has been removed? (each copper atom has 29 protons, and copper has an atomic mass of 63.5.)

How do we use light in space?

What units are used for gravitational potential energy? Write the name, not the symbol.

A 7.5 kg block is placed on a table. If it's bottom surface area is 0.6m2, how much pressure does the block exert on the tabletop? A. 376.5 Pa B. 73.5 Pa C. 226.5 Pa D. 122.5 Pa

A boulder of mass 2000 kg is at the top of a cliff of height 220 m. Determine how fast the boulder will be moving when it strikes the dirt below.

Which of the following statements are true? Check all that apply. O A positive charge and a negative charge attract each other. O Electric charge is conserved. O Two positive charges attract each other. O A neutral object contains no charge.